北羌塘坳陷夏里组碎屑岩地球化学特征及其对风化、物源与构造背景的启示<sup>*</sup>

doi:10.7605/gdlxb.2025.077

古地理学报 ›› 2026, Vol. 28 ›› Issue (1): 245-263. doi: 10.7605/gdlxb.2025.077

• 岩相古地理学及沉积学 • 上一篇下一篇

北羌塘坳陷夏里组碎屑岩地球化学特征及其对风化、物源与构造背景的启示^*

戚俊¹^,²(), 王忠伟¹^,²(), 王剑¹^,², 隋博雨¹^,², 李磊¹^,²

1 西南石油大学地球科学与技术学院,四川成都 610500
2 西南石油大学羌塘盆地研究院,四川成都 610500

收稿日期:2024-12-20 修回日期:2025-03-10 出版日期:2026-02-01 发布日期:2026-02-09
通讯作者: 王忠伟,男,1990年生,西南石油大学副教授,主要从事中生代羌塘盆地演化与油气资源评价研究。E-mail: wzwcdg@sina.com。
作者简介:
戚俊,男,2001年生,西南石油大学硕士研究生,主要从事沉积学研究工作。E-mail: 502205919@qq.com。
基金资助:
*国家自然科学基金项目(42241202); 国家自然科学基金项目(42372129); 四川省自然科学基金项目(2024NSFSC0833)

Geochemical characteristics of clastic rocks from the Xiali Formation in North Qiangtang Depression and their implications for weathering,provenance and tectonic setting

QI Jun¹^,²(), WANG Zhongwei¹^,²(), WANG Jian¹^,², SUI Boyu¹^,², LI Lei¹^,²

1 School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China
2 Qiangtang Institute of Sedimentary Basin,Southwest Petroleum University,Chengdu 610500,China

Received:2024-12-20 Revised:2025-03-10 Online:2026-02-01 Published:2026-02-09
Contact: WANG Zhongwei,born in 1990,is an associate professor in Southwest Petroleum University. He is engaged in researches on the evolution of the Mesozoic Qiangtang Basin and the evaluation of oil and gas resources. E-mail: wzwcdg@sina.com.
About author:
QI Jun,born in 2001,masteral degree candidate,is mainly engaged in research on sedimentology. E-mail: 502205919@qq.com.
Supported by:
National Natural Science Foundation of China(42241202); National Natural Science Foundation of China(42372129); Natural Science Foundation of Sichuan Province(2024NSFSC0833)

摘要/Abstract

摘要：

北羌塘坳陷中侏罗世夏里组沉积期发生了一次大规模海退,发育大量含膏碎屑岩。本研究以北羌塘坳陷胜利河西剖面和羌科1井夏里组碎屑岩岩石学及元素地球化学资料为基础,分析其物源区化学风化强度、沉积物源属性及大地构造背景,明确其对侏罗纪盆地演化及成盐响应的意义。结果表明: (1)研究区夏里组碎屑岩化学风化指数(CIA)受颗粒大小与分选性影响较大,且基本不受沉积旋回的影响,故泥页岩样品的CIA值能够较真实地反映物源区的化学风化强度。羌科1井夏里组泥页岩CIA值波动较大(60~77),基本不受钾交代作用影响,表明羌科1井物源区总体上经历了中等—弱的化学风化作用。胜利河西剖面夏里组泥页岩样品的CIA值受钾交代作用影响较大,经钾校正后的泥页岩样品CIA值(CIAcorr)为80~85,表明胜利河西剖面物源区经历了强烈的化学风化作用。(2)依据La/Th vs. Hf、Co/Th vs. La/Sc、La/Yb vs. 􀰐REE及A-CN-K等判别图解,结合显著的Eu负异常,推测夏里组物源主要来自长英质岩石。其中, 北羌塘坳陷西部胜利河和中部羌科1井地区夏里组碎屑岩主体形成于碰撞型构造背景,而东部沱沱河地区夏里组主体形成于岛弧构造背景,这一结论与北羌塘坳陷侏罗纪中期的构造体制一致, 即侏罗纪中期北羌塘中、西部为陆内弱挤压前陆盆地,而东部可能为班公湖—怒江新特提斯洋俯冲消减诱发的弧后前陆盆地。(3)侏罗纪早、中期北羌塘地区多期次海侵—海退、相对干旱的古气候条件及局限的古地理背景为夏里组膏盐岩形成奠定了有利条件。

关键词: 化学风化, 物源, 碰撞型背景, 夏里组, 羌塘盆地

Abstract:

A large-scale marine regression occurred during the depositional period of the Middle Jurassic Xiali Formation in the North Qiangtang Depression,accompanied by the widespread deposition of gypsum-bearing clastic sediments. Based on integrated petrological characteristics and elemental geochemical analyses of clastic rocks from the Xiali Formation in the Shenglihexi section and Well QK-1,we systematically analyzed the intensity of chemical weathering,provenance characteristics,and tectonic setting of these sediments,which is critical for understanding the evolutionary history and evaporite response of the Jurassic basin system. The results indicate that the Chemical Index of Alteration(CIA)values of these clastic rocks are significantly influenced by grain size and sediment sorting,but minimally affected by sedimentary recycling;thus,the CIA values of mudstone samples reflect the intensity of chemical weathering in the source region. Mudstones from the Xiali Formation in Well QK-1 exhibit considerable variation in CIA values(60-77),with negligible influence from potassium metasomatism,indicating that the source area underwent generally moderate to weak chemical weathering. In contrast,mudstones from the Shenglihexi section show significant effects of potassium metasomatism;after correction for this influence(CIAcorr),their values range from 80 to 85,suggesting intense chemical weathering in the corresponding source region. Discriminant diagrams based on La/Th vs. Hf,Co/Th vs. La/Sc,La/Yb vs. 􀰐REE,and A-CN-K plots,along with pronounced negative Eu anomalies,collectively indicate a predominantly felsic rock provenance for these clastic deposits. Clastic sediments from the western and central segments of the North Qiangtang Depression were deposited in a continental collision setting,whereas those from the eastern segment were formed in an arc-related tectonic environment. This interpretation aligns well with the established tectonic framework of the North Qiangtang Depression during the Middle Jurassic. During this period,the central and western regions functioned as a weakly magmatic intracontinental foreland basin,while the eastern region likely developed as a back-arc foreland basin,induced by southward subduction of the Bangonghu-Nujiang Tethys Ocean. Multiple transgressive-regressive cycles,combined with a relatively arid palaeoclimate and restricted paleogeographic conditions in the North Qiangtang Depression during the Early to Middle Jurassic,may have created favorable conditions for the formation of extensive gypsum-rich evaporites within the Xiali Formation.

Key words: chemical weathering, provenance, collision setting, Xiali Formation, Qiangtang Basin

中图分类号:

P594

戚俊, 王忠伟, 王剑, 隋博雨, 李磊. 北羌塘坳陷夏里组碎屑岩地球化学特征及其对风化、物源与构造背景的启示^*[J]. 古地理学报, 2026, 28(1): 245-263.

QI Jun, WANG Zhongwei, WANG Jian, SUI Boyu, LI Lei. Geochemical characteristics of clastic rocks from the Xiali Formation in North Qiangtang Depression and their implications for weathering,provenance and tectonic setting[J]. Journal of Palaeogeography（Chinese Edition）, 2026, 28(1): 245-263.

http://www.gdlxb.cn/CN/Y2026/V28/I1/245

图/表 14

图 1 北羌塘坳陷羌科1井和胜利河西地区地质简图及夏里组地层柱状图和采样位置 a—青藏高原构造单元; b—羌塘盆地构造单元; c—羌科1井地区地质简图; d—胜利河西地区地质简图; e—羌科1井夏里组地层柱状图及采样位置; f—胜利河西剖面夏里组地层柱状图及采样位置

Fig.1 Brief geologic map,stratigraphic column and sampling positions of the Well QK-1 and Shenglihexi area in North Qiangtang Depression

图 2 北羌塘坳陷胜利河西剖面夏里组岩石薄片显微特征(正交偏光) a—砂质鲕粒灰岩,样品4-6B;b—灰质岩屑砂岩,样品4-10B;c—灰质岩屑砂岩,样品4-12B;d—含砂质鲕粒灰岩,样品4-14B; e—细粒岩屑砂岩,样品4-15B;f—细粒岩屑砂岩,样品4-18B

Fig.2 Microscopical characteristics of the Xiali Formation rocks from Shenglihexi section,North Qiangtang Depression(Cross-polarized light)

附表 1 北羌塘坳陷胜利河西剖面和羌科1井夏里组样品主量元素含量(%)及相关元素比值

Appendix 1 Major elements abundances(%)and associated ratios of the Xiali Formation samples from Shenglihexi section and Well QK-1,North Qiangtang Depression

剖面	编号	岩性	SiO₂	(SiO₂)_adj	Al₂O₃	Fe₂ $O 3 T$	MgO	CaO	Na₂O	K₂O	MnO	TiO₂	P₂O₅	烧失量	SiO₂/Al₂O₃	Fe₂ $O 3 T$ /K₂O	CIA	CIA_corr	ICV	低硅型			高硅型
																				DF1	DF2	DF1	DF2
羌科1井	QK1-73	泥岩	57.0	62.2	18.2	5.07	2.05	4.19	0.45	3.79	0.04	0.73	0.12	8.36	3.13	1.34	77	77	0.83	3.60	0.35	—	—
	QK1-158	泥岩	53.4	61.2	12.7	4.57	1.96	10.4	0.94	2.51	0.08	0.59	0.12	12.8	4.21	1.82	69	69	1.15	1.95	0.34	—	—
	QK1-210	泥岩	55.0	60.6	16.4	6.14	2.44	5.60	0.95	3.23	0.06	0.69	0.13	9.33	3.34	1.90	71	71	1.08	2.17	0.63	—	—
	QK1-271	泥岩	59.3	63.7	17.3	6.04	2.28	2.60	1.20	3.54	0.05	0.72	0.11	6.85	3.43	1.71	69	69	1.07	—	—	0.70	-1.38
	QK1-411	泥岩	56.2	61.8	15.9	6.39	2.09	4.94	1.11	3.44	0.07	0.66	0.12	9.10	3.53	1.86	68	68	1.12	1.98	0.73	—	—
	QK1-467	泥岩	57.7	63.6	13.4	5.42	2.28	7.00	1.25	2.82	0.11	0.63	0.12	9.30	4.32	1.92	65	65	1.30	—	—	1.35	-1.28
	QK1-558	泥岩	58.6	65.4	11.7	4.00	1.93	8.82	1.41	2.40	0.07	0.57	0.12	10.4	5.02	1.67	62	62	1.33	—	—	0.96	-1.55
	QK1-663	泥岩	56.2	61.8	15.4	5.52	2.05	6.22	1.14	3.53	0.09	0.66	0.11	9.07	3.65	1.56	67	67	1.12	1.95	0.31	—	—
	QK1-751	泥岩	56.9	64.4	11.1	3.61	1.78	10.4	1.59	2.11	0.06	0.62	0.11	11.5	5.11	1.71	60	60	1.37	—	—	0.75	-1.54
	QK1-843	泥岩	57.5	62.8	15.4	5.82	2.16	5.45	1.36	3.03	0.09	0.69	0.13	8.20	3.74	1.92	66	66	1.17	1.38	0.37	—	—
	QK1-951	泥岩	55.7	60.6	17.1	6.75	2.68	3.96	1.32	3.31	0.09	0.75	0.14	8.14	3.25	2.04	68	68	1.18	1.43	0.21	—	—
	QK1-1047	泥岩	55.2	60.2	18.6	7.10	2.39	2.96	0.97	3.64	0.07	0.71	0.13	8.19	2.98	1.95	72	72	1.01	1.97	0.43	—	—
胜利河西剖面	4-6B	砂质灰岩	36.4	48.7	3.10	2.57	0.88	30.3	0.10	0.83	0.06	0.29	0.07	25.3	11.73	3.10	72	72	1.80	—	—	—	—
	4-1^*	泥岩	57.1	63.5	13.8	5.62	3.12	4.96	0.31	3.50	0.04	1.25	0.15	9.77	4.14	1.61	74	82	1.30	—	—	2.89	-3.88
	4-4^*	泥岩	57.1	62.7	15.9	6.82	3.20	2.26	0.34	4.08	0.04	1.23	0.15	8.55	3.59	1.67	74	82	1.24	4.77	0.20	—	—
	4-5^*	泥岩	57.0	62.8	15.3	6.72	3.10	2.94	0.29	4.03	0.04	1.13	0.15	8.78	3.73	1.67	74	83	1.24	5.04	0.20	—	—
	4-7^*	泥岩	58.9	64.6	14.5	6.45	3.02	2.86	0.44	3.63	0.03	1.19	0.15	8.50	4.06	1.78	73	80	1.29	—	—	1.92	-3.34
	4-8^*	泥岩	56.2	61.6	17.0	6.79	3.37	1.97	0.21	4.46	0.03	1.15	0.12	8.64	3.31	1.52	75	85	1.18	5.51	-0.24	—	—
	4-9^*	泥岩	56.8	62.8	16.0	6.56	3.10	2.22	0.25	4.19	0.03	1.15	0.13	9.18	3.55	1.57	75	84	1.19	5.30	0.03	—	—
	4-10^*	泥岩	55.2	61.5	16.6	6.83	3.15	2.02	0.20	4.51	0.03	1.13	0.12	9.37	3.33	1.51	75	85	1.17	5.62	-0.22	—	—
	4-11^*	泥岩	51.3	58.3	14.5	6.27	3.32	7.32	0.26	3.80	0.05	1.10	0.14	11.6	3.54	1.65	74	83	1.30	5.08	-0.44	—	—
	4-13^*	泥岩	47.1	55.1	13.3	5.61	3.10	11.3	0.22	3.60	0.06	1.03	0.13	14.1	3.54	1.56	74	84	1.32	5.29	-0.65	—	—
	4-10B	砂岩	59.7	70.0	4.50	3.87	4.99	9.82	0.37	1.15	0.16	0.67	0.09	14.5	13.26	3.36	65	65	4.17	—	—	4.89	-2.22
	4-14^*	泥岩	56.2	61.7	15.7	7.07	3.38	2.85	0.25	4.15	0.04	1.29	0.15	8.60	3.58	1.70	75	84	1.28	5.31	-0.14	—	—
	4-16^*	泥岩	57.0	62.3	16.2	6.27	3.40	2.60	0.23	4.34	0.04	1.22	0.14	8.54	3.52	1.44	75	84	1.22	5.40	-0.46	—	—
	4-18^*	泥岩	57.0	62.2	15.7	6.75	3.46	2.91	0.33	4.04	0.04	1.30	0.16	8.26	3.63	1.67	74	83	1.29	4.86	-0.04	—	—
	4-20^*	泥岩	55.0	61.3	14.3	6.61	3.22	5.04	0.30	3.81	0.05	1.29	0.16	9.54	3.85	1.73	74	82	1.35	4.99	-0.11	—	—
	4-22^*	泥岩	54.8	60.8	15.2	6.67	3.33	4.49	0.22	4.06	0.05	1.20	0.14	9.30	3.61	1.64	75	84	1.28	5.45	-0.38	—	—
胜利河西剖面	4-24^*	泥岩	55.6	61.4	15.1	6.64	3.31	4.10	0.39	3.87	0.05	1.27	0.15	9.14	3.68	1.72	73	81	1.31	4.52	0.01	—	—
	4-26	泥岩	46.9	55.1	14.6	7.61	3.07	7.78	0.24	3.95	0.06	0.92	0.07	11.0	3.22	1.93	74	84	1.30	5.05	-0.58	—	—
	4-12B	砂岩	58.6	67.0	9.3	4.34	2.03	9.23	0.68	2.21	0.07	0.91	0.15	10.6	6.30	1.97	67	67	1.49	—	—	1.57	-3.06
	4-28	泥岩	39.2	47.9	11.9	5.66	3.29	17.6	0.29	2.85	0.10	0.80	0.12	17.6	3.30	1.99	75	82	1.45	4.11	-1.13	—	—
	4-14B	砂质灰岩	23.8	34.8	2.85	1.48	1.18	37.6	0.44	0.48	0.19	0.28	0.09	30.4	8.35	3.07	59	59	2.30	—	—	—	—
	4-15B	砂岩	70.2	74.7	8.72	3.93	1.83	4.77	1.20	1.78	0.06	1.33	0.17	5.65	8.05	2.21	60	60	1.70	—	—	0.34	-2.75
	4-30	泥岩	52.2	58.0	16.8	8.37	3.89	3.00	0.43	3.95	0.05	1.22	0.15	8.58	3.11	2.12	75	81	1.34	4.13	-0.01	—	—
	4-18B	砂岩	69.1	73.6	9.73	4.31	2.03	4.39	0.99	2.10	0.05	1.10	0.13	5.82	7.11	2.05	64	64	1.54	—	—	0.79	-2.68
	UCC	—	66.6	—	15.4	5.04	2.48	3.59	3.27	2.8	0.1	0.64	0.15	—	—	—	—	—	—	—	—	—	—

附表 1 北羌塘坳陷胜利河西剖面和羌科1井夏里组样品主量元素含量(%)及相关元素比值

Appendix 1 Major elements abundances(%)and associated ratios of the Xiali Formation samples from Shenglihexi section and Well QK-1,North Qiangtang Depression

剖面	编号	岩性	SiO₂	(SiO₂)_adj	Al₂O₃	Fe₂ $O 3 T$	MgO	CaO	Na₂O	K₂O	MnO	TiO₂	P₂O₅	烧失量	SiO₂/Al₂O₃	Fe₂ $O 3 T$ /K₂O	CIA	CIA_corr	ICV	低硅型			高硅型
																				DF1	DF2	DF1	DF2
羌科1井	QK1-73	泥岩	57.0	62.2	18.2	5.07	2.05	4.19	0.45	3.79	0.04	0.73	0.12	8.36	3.13	1.34	77	77	0.83	3.60	0.35	—	—
	QK1-158	泥岩	53.4	61.2	12.7	4.57	1.96	10.4	0.94	2.51	0.08	0.59	0.12	12.8	4.21	1.82	69	69	1.15	1.95	0.34	—	—
	QK1-210	泥岩	55.0	60.6	16.4	6.14	2.44	5.60	0.95	3.23	0.06	0.69	0.13	9.33	3.34	1.90	71	71	1.08	2.17	0.63	—	—
	QK1-271	泥岩	59.3	63.7	17.3	6.04	2.28	2.60	1.20	3.54	0.05	0.72	0.11	6.85	3.43	1.71	69	69	1.07	—	—	0.70	-1.38
	QK1-411	泥岩	56.2	61.8	15.9	6.39	2.09	4.94	1.11	3.44	0.07	0.66	0.12	9.10	3.53	1.86	68	68	1.12	1.98	0.73	—	—
	QK1-467	泥岩	57.7	63.6	13.4	5.42	2.28	7.00	1.25	2.82	0.11	0.63	0.12	9.30	4.32	1.92	65	65	1.30	—	—	1.35	-1.28
	QK1-558	泥岩	58.6	65.4	11.7	4.00	1.93	8.82	1.41	2.40	0.07	0.57	0.12	10.4	5.02	1.67	62	62	1.33	—	—	0.96	-1.55
	QK1-663	泥岩	56.2	61.8	15.4	5.52	2.05	6.22	1.14	3.53	0.09	0.66	0.11	9.07	3.65	1.56	67	67	1.12	1.95	0.31	—	—
	QK1-751	泥岩	56.9	64.4	11.1	3.61	1.78	10.4	1.59	2.11	0.06	0.62	0.11	11.5	5.11	1.71	60	60	1.37	—	—	0.75	-1.54
	QK1-843	泥岩	57.5	62.8	15.4	5.82	2.16	5.45	1.36	3.03	0.09	0.69	0.13	8.20	3.74	1.92	66	66	1.17	1.38	0.37	—	—
	QK1-951	泥岩	55.7	60.6	17.1	6.75	2.68	3.96	1.32	3.31	0.09	0.75	0.14	8.14	3.25	2.04	68	68	1.18	1.43	0.21	—	—
	QK1-1047	泥岩	55.2	60.2	18.6	7.10	2.39	2.96	0.97	3.64	0.07	0.71	0.13	8.19	2.98	1.95	72	72	1.01	1.97	0.43	—	—
胜利河西剖面	4-6B	砂质灰岩	36.4	48.7	3.10	2.57	0.88	30.3	0.10	0.83	0.06	0.29	0.07	25.3	11.73	3.10	72	72	1.80	—	—	—	—
	4-1^*	泥岩	57.1	63.5	13.8	5.62	3.12	4.96	0.31	3.50	0.04	1.25	0.15	9.77	4.14	1.61	74	82	1.30	—	—	2.89	-3.88
	4-4^*	泥岩	57.1	62.7	15.9	6.82	3.20	2.26	0.34	4.08	0.04	1.23	0.15	8.55	3.59	1.67	74	82	1.24	4.77	0.20	—	—
	4-5^*	泥岩	57.0	62.8	15.3	6.72	3.10	2.94	0.29	4.03	0.04	1.13	0.15	8.78	3.73	1.67	74	83	1.24	5.04	0.20	—	—
	4-7^*	泥岩	58.9	64.6	14.5	6.45	3.02	2.86	0.44	3.63	0.03	1.19	0.15	8.50	4.06	1.78	73	80	1.29	—	—	1.92	-3.34
	4-8^*	泥岩	56.2	61.6	17.0	6.79	3.37	1.97	0.21	4.46	0.03	1.15	0.12	8.64	3.31	1.52	75	85	1.18	5.51	-0.24	—	—
	4-9^*	泥岩	56.8	62.8	16.0	6.56	3.10	2.22	0.25	4.19	0.03	1.15	0.13	9.18	3.55	1.57	75	84	1.19	5.30	0.03	—	—
	4-10^*	泥岩	55.2	61.5	16.6	6.83	3.15	2.02	0.20	4.51	0.03	1.13	0.12	9.37	3.33	1.51	75	85	1.17	5.62	-0.22	—	—
	4-11^*	泥岩	51.3	58.3	14.5	6.27	3.32	7.32	0.26	3.80	0.05	1.10	0.14	11.6	3.54	1.65	74	83	1.30	5.08	-0.44	—	—
	4-13^*	泥岩	47.1	55.1	13.3	5.61	3.10	11.3	0.22	3.60	0.06	1.03	0.13	14.1	3.54	1.56	74	84	1.32	5.29	-0.65	—	—
	4-10B	砂岩	59.7	70.0	4.50	3.87	4.99	9.82	0.37	1.15	0.16	0.67	0.09	14.5	13.26	3.36	65	65	4.17	—	—	4.89	-2.22
	4-14^*	泥岩	56.2	61.7	15.7	7.07	3.38	2.85	0.25	4.15	0.04	1.29	0.15	8.60	3.58	1.70	75	84	1.28	5.31	-0.14	—	—
	4-16^*	泥岩	57.0	62.3	16.2	6.27	3.40	2.60	0.23	4.34	0.04	1.22	0.14	8.54	3.52	1.44	75	84	1.22	5.40	-0.46	—	—
	4-18^*	泥岩	57.0	62.2	15.7	6.75	3.46	2.91	0.33	4.04	0.04	1.30	0.16	8.26	3.63	1.67	74	83	1.29	4.86	-0.04	—	—
	4-20^*	泥岩	55.0	61.3	14.3	6.61	3.22	5.04	0.30	3.81	0.05	1.29	0.16	9.54	3.85	1.73	74	82	1.35	4.99	-0.11	—	—
	4-22^*	泥岩	54.8	60.8	15.2	6.67	3.33	4.49	0.22	4.06	0.05	1.20	0.14	9.30	3.61	1.64	75	84	1.28	5.45	-0.38	—	—
胜利河西剖面	4-24^*	泥岩	55.6	61.4	15.1	6.64	3.31	4.10	0.39	3.87	0.05	1.27	0.15	9.14	3.68	1.72	73	81	1.31	4.52	0.01	—	—
	4-26	泥岩	46.9	55.1	14.6	7.61	3.07	7.78	0.24	3.95	0.06	0.92	0.07	11.0	3.22	1.93	74	84	1.30	5.05	-0.58	—	—
	4-12B	砂岩	58.6	67.0	9.3	4.34	2.03	9.23	0.68	2.21	0.07	0.91	0.15	10.6	6.30	1.97	67	67	1.49	—	—	1.57	-3.06
	4-28	泥岩	39.2	47.9	11.9	5.66	3.29	17.6	0.29	2.85	0.10	0.80	0.12	17.6	3.30	1.99	75	82	1.45	4.11	-1.13	—	—
	4-14B	砂质灰岩	23.8	34.8	2.85	1.48	1.18	37.6	0.44	0.48	0.19	0.28	0.09	30.4	8.35	3.07	59	59	2.30	—	—	—	—
	4-15B	砂岩	70.2	74.7	8.72	3.93	1.83	4.77	1.20	1.78	0.06	1.33	0.17	5.65	8.05	2.21	60	60	1.70	—	—	0.34	-2.75
	4-30	泥岩	52.2	58.0	16.8	8.37	3.89	3.00	0.43	3.95	0.05	1.22	0.15	8.58	3.11	2.12	75	81	1.34	4.13	-0.01	—	—
	4-18B	砂岩	69.1	73.6	9.73	4.31	2.03	4.39	0.99	2.10	0.05	1.10	0.13	5.82	7.11	2.05	64	64	1.54	—	—	0.79	-2.68
	UCC	—	66.6	—	15.4	5.04	2.48	3.59	3.27	2.8	0.1	0.64	0.15	—	—	—	—	—	—	—	—	—	—

图 3 北羌塘坳陷胜利河西剖面和羌科1井夏里组样品主量元素(a)和微量元素(b)蛛网图

Fig.3 UCC-normalized major element(a)and trace element(b)spider diagrams of the Xiali Formation from Shenglihexi section and Well QK-1,North Qiangtang Depression

图 4 北羌塘坳陷胜利河西剖面和羌科1井夏里组碎屑岩岩性判别图(据Herron,1988;有修改)

Fig.4 Chemical classification of the Xiali Formation clastic rocks from Shenglihexi section and Well QK-1, North Qiangtang Depression(modified from Herron,1988)

图 5 北羌塘坳陷胜利河西剖面和羌科1井夏里组碎屑岩样品各类型指标之间的相关性

Fig.5 Correlation between various types of geochemical indicators of the Xiali Formation clastic rocks from Shenglihexi section and Well QK-1,North Qiangtang Depression

附表 2 北羌塘坳陷胜利河西剖面和羌科1井夏里组样品微量元素含量(μg/g)及相关元素比值

Appendix 2 Trace elements abundances(μg/g)and associated ratios of the Xiali Formation samples from Shenglihexi section and Well QK-1,North Qiangtang Depression

剖面	编号	Cs	Rb	Ba	Th	U	Nb	Ta	Pb	Sr	Zr	Hf	Y	Sc	Cr	Co	Cu	Zr/Sc	Th/Sc	La/Th	La/Sc	Co/Th	Sr/Cu	Rb/Sr	Sr/Ba	Rb/K
羌科1井	QK1-73	27.8	209	218	17.7	2.77	18.8	1.41	22.9	163	129	3.79	30.0	16.0	55.9	14.8	37.4	8.06	1.11	2.44	2.70	0.84	4.36	1.28	0.75	0.0066
	QK1-158	15.4	132	319	13.4	2.45	15.4	1.14	17.7	211	121	3.73	27.3	10.7	51.2	11.9	27.1	11.3	1.25	2.70	3.38	0.89	7.79	0.63	0.66	0.0063
	QK1-210	19.5	157	221	15.2	2.73	16.6	1.25	14.3	252	119	3.58	29.9	13.8	58.0	14.5	29.0	8.62	1.10	2.55	2.80	0.95	8.69	0.62	1.14	0.0059
	QK1-271	19.5	172	247	14.8	2.85	17.3	1.23	11.0	259	140	4.30	30.9	15.8	47.0	14.1	29.4	8.86	0.94	2.70	2.53	0.95	8.81	0.66	1.05	0.0059
	QK1-411	16.4	165	345	14.1	2.79	16.1	1.25	12.4	232	120	3.88	30.9	15.0	76.0	15.6	29.9	8.00	0.94	2.84	2.67	1.11	7.76	0.71	0.67	0.0058
	QK1-467	13.2	126	813	13.0	2.90	15.5	1.21	87.8	863	106	3.56	28.9	11.5	63.1	16.5	36.4	9.22	1.13	2.91	3.29	1.27	23.7	0.15	1.06	0.0054
	QK1-558	11.0	114	372	11.4	2.33	13.9	1.04	12.9	198	129	3.87	24.4	9.77	51.7	8.77	61.3	13.2	1.17	2.89	3.37	0.77	3.23	0.58	0.53	0.0057
	QK1-663	15.2	163	339	14.2	2.76	15.1	1.15	13.6	170	122	3.97	28.0	15.2	62.9	14.1	29.6	8.03	0.93	2.64	2.47	0.99	5.74	0.96	0.50	0.0056
	QK1-751	7.9	97.8	686	10.4	2.16	13.0	0.96	10.6	299	105	2.74	25.5	10.2	54.9	10.6	22.9	10.3	1.02	3.00	3.06	1.02	13.1	0.33	0.44	0.0056
	QK1-843	13.3	147	309	12.8	2.43	14.0	1.02	14.5	163	106	2.78	28.8	15.3	65.8	16.0	34.1	6.93	0.84	2.82	2.36	1.25	4.78	0.90	0.53	0.0058
	QK1-951	14.6	153	378	15.0	2.88	13.2	0.97	11.5	220	137	4.34	26.6	15.6	70.0	15.6	27.4	8.78	0.96	2.52	2.42	1.04	8.03	0.70	0.58	0.0056
	QK1-1047	21.3	166	313	14.5	2.69	12.4	0.87	11.8	139	137	4.48	25.6	17.0	72.1	15.6	38.5	8.06	0.85	2.61	2.23	1.08	3.61	1.19	0.44	0.0055
胜利河西剖面	4-6B	1.80	23.9	80.5	3.38	0.68	3.59	0.34	6.13	114	33.9	0.96	7.038	3.60	55.6	4.47	4.19	9.40	0.94	3.03	2.84	1.32	27.1	0.21	1.14	0.0035
	4-1^*	6.51	119	254	14.0	2.40	21.7	1.75	5.00	68.9	228	5.05	26.7	15.8	111	20.1	25.8	14.4	0.89	2.98	2.64	1.44	2.67	1.73	0.27	0.0041
	4-4^*	7.88	130	302	14.0	2.10	23.1	1.75	12.8	59.0	241	5.43	26.6	20.6	115	25.5	48.1	11.7	0.68	2.84	1.93	1.82	1.23	2.20	0.20	0.0038
	4-5^*	8.73	127	349	14.2	2.18	22.5	1.82	11.2	66.3	203	4.99	27.3	18.0	112	29.5	21.7	11.3	0.79	3.00	2.37	2.08	3.06	1.92	0.19	0.0038
	4-7^*	8.28	128	315	14.3	2.13	24.9	1.85	5.87	76.8	231	5.23	23.9	18.9	123	22.7	65.5	12.2	0.76	2.84	2.15	1.59	1.17	1.67	0.24	0.0042
	4-8^*	11.2	164	356	14.8	2.41	25.1	1.99	9.75	63.3	241	5.45	18.8	22.1	126	21.7	30.9	10.9	0.67	2.87	1.92	1.47	2.05	2.59	0.18	0.0044
	4-9^*	9.04	146	335	14.3	2.30	22.7	1.76	12.4	59.7	222	5.16	18.0	18.9	124	21.0	19.5	11.7	0.76	2.95	2.23	1.47	3.06	2.45	0.18	0.0042
	4-10^*	10.6	156	356	15.2	2.20	23.6	1.66	9.29	64.7	210	5.29	17.6	21.0	137	19.7	20.6	10.0	0.72	2.74	1.98	1.30	3.14	2.41	0.18	0.0042
	4-11^*	7.98	134	268	12.8	1.96	21.8	1.61	4.62	88.5	206	4.51	22.3	16.5	119	18.0	41.6	12.5	0.78	2.73	2.12	1.41	2.13	1.51	0.33	0.0042
	4-13^*	7.64	116	239	12.0	2.14	18.3	1.51	6.96	117	179	4.13	23.0	17.5	115	21.7	31.8	10.2	0.69	3.18	2.18	1.81	3.68	0.99	0.49	0.0039
	4-10B	1.43	33.3	111	4.55	0.87	6.02	0.55	9.58	54.3	74.4	2.43	12.8	5.28	83.1	6.17	5.39	14.1	0.86	3.32	2.86	1.36	10.1	0.61	0.49	0.0035
	4-14^*	9.14	140	300	15.0	2.36	25.3	1.83	14.0	67.9	232	5.46	25.2	21.3	144	28.2	17.5	10.9	0.70	2.99	2.11	1.88	3.88	2.06	0.23	0.0041
	4-16^*	9.64	151	328	15.6	2.26	24.3	1.78	6.84	70.9	220	5.45	22.4	20.4	130	22.4	30.5	10.8	0.76	2.75	2.10	1.44	2.32	2.13	0.22	0.0042
	4-18^*	9.36	138	316	14.8	2.18	22.9	1.81	7.59	71.6	228	5.41	25.3	21.5	151	23.3	117	10.6	0.69	3.02	2.08	1.57	0.61	1.93	0.23	0.0041
	4-20^*	8.00	114	287	13.4	1.98	24.8	1.91	6.37	80.7	212	5.31	28.6	18.6	131	23.5	27.6	11.4	0.72	3.01	2.17	1.75	2.92	1.41	0.28	0.0036
胜利河西剖面	4-22^*	8.79	131	333	14.2	2.12	21.7	1.76	7.07	76.8	212	4.80	25.4	18.6	146	23.0	46.4	11.4	0.76	2.90	2.22	1.62	1.66	1.71	0.23	0.0039
	4-24^*	8.52	132	301	13.4	2.18	22.9	1.92	6.04	76.3	225	5.23	25.6	19.4	138	26.9	86.3	11.6	0.69	3.13	2.16	2.01	0.88	1.73	0.25	0.0041
	4-26	12.5	161	235	14.1	2.15	16.7	1.67	26.6	104	157	5.49	17.1	19.5	122	19.4	30.3	8.05	0.73	2.15	1.56	1.37	3.42	1.55	0.44	0.0049
	4-12B	4.59	78.5	225	9.77	1.67	13.7	1.32	21.7	97.6	137	4.71	18.4	12.1	112	15.9	47.0	11.2	0.80	2.72	2.19	1.62	2.08	0.80	0.43	0.0043
	4-28	7.47	104	208	11.0	1.80	13.8	1.29	8.85	143	135	4.97	19.8	16.3	119	12.6	12.8	8.28	0.67	2.65	1.79	1.15	11.2	0.73	0.69	0.0044
	4-14B	0.84	18.0	61.8	3.29	0.92	3.88	0.34	16.6	197	81.1	2.33	14.0	3.86	57.8	11.1	6.14	21.0	0.85	5.07	4.33	3.37	32.1	0.09	3.18	0.0045
	4-15B	2.70	54.0	196	9.36	1.55	11.2	1.01	4.79	65.8	165	5.71	21.3	10.8	116	9.76	4.40	15.3	0.87	2.91	2.53	1.04	15.0	0.82	0.34	0.0037
	4-30	10.2	140	322	15.7	2.53	20.8	2.26	12.1	71.4	178	6.29	21.6	20.4	152	20.2	56.7	8.74	0.77	2.40	1.84	1.29	1.26	1.97	0.22	0.0043
	4-18B	3.35	67.1	233	9.42	1.53	11.1	0.99	6.26	69.3	147	5.25	20.8	11.9	121	14.2	8.33	12.4	0.79	3.20	2.54	1.51	8.33	0.97	0.30	0.0038
	UCC	4.9	84	628	10.5	2.7	12	0.9	17	320	193	5.3	21	14	92	17.3	—	—	—	—	—	—	—	—	—	—

附表 2 北羌塘坳陷胜利河西剖面和羌科1井夏里组样品微量元素含量(μg/g)及相关元素比值

Appendix 2 Trace elements abundances(μg/g)and associated ratios of the Xiali Formation samples from Shenglihexi section and Well QK-1,North Qiangtang Depression

剖面	编号	Cs	Rb	Ba	Th	U	Nb	Ta	Pb	Sr	Zr	Hf	Y	Sc	Cr	Co	Cu	Zr/Sc	Th/Sc	La/Th	La/Sc	Co/Th	Sr/Cu	Rb/Sr	Sr/Ba	Rb/K
羌科1井	QK1-73	27.8	209	218	17.7	2.77	18.8	1.41	22.9	163	129	3.79	30.0	16.0	55.9	14.8	37.4	8.06	1.11	2.44	2.70	0.84	4.36	1.28	0.75	0.0066
	QK1-158	15.4	132	319	13.4	2.45	15.4	1.14	17.7	211	121	3.73	27.3	10.7	51.2	11.9	27.1	11.3	1.25	2.70	3.38	0.89	7.79	0.63	0.66	0.0063
	QK1-210	19.5	157	221	15.2	2.73	16.6	1.25	14.3	252	119	3.58	29.9	13.8	58.0	14.5	29.0	8.62	1.10	2.55	2.80	0.95	8.69	0.62	1.14	0.0059
	QK1-271	19.5	172	247	14.8	2.85	17.3	1.23	11.0	259	140	4.30	30.9	15.8	47.0	14.1	29.4	8.86	0.94	2.70	2.53	0.95	8.81	0.66	1.05	0.0059
	QK1-411	16.4	165	345	14.1	2.79	16.1	1.25	12.4	232	120	3.88	30.9	15.0	76.0	15.6	29.9	8.00	0.94	2.84	2.67	1.11	7.76	0.71	0.67	0.0058
	QK1-467	13.2	126	813	13.0	2.90	15.5	1.21	87.8	863	106	3.56	28.9	11.5	63.1	16.5	36.4	9.22	1.13	2.91	3.29	1.27	23.7	0.15	1.06	0.0054
	QK1-558	11.0	114	372	11.4	2.33	13.9	1.04	12.9	198	129	3.87	24.4	9.77	51.7	8.77	61.3	13.2	1.17	2.89	3.37	0.77	3.23	0.58	0.53	0.0057
	QK1-663	15.2	163	339	14.2	2.76	15.1	1.15	13.6	170	122	3.97	28.0	15.2	62.9	14.1	29.6	8.03	0.93	2.64	2.47	0.99	5.74	0.96	0.50	0.0056
	QK1-751	7.9	97.8	686	10.4	2.16	13.0	0.96	10.6	299	105	2.74	25.5	10.2	54.9	10.6	22.9	10.3	1.02	3.00	3.06	1.02	13.1	0.33	0.44	0.0056
	QK1-843	13.3	147	309	12.8	2.43	14.0	1.02	14.5	163	106	2.78	28.8	15.3	65.8	16.0	34.1	6.93	0.84	2.82	2.36	1.25	4.78	0.90	0.53	0.0058
	QK1-951	14.6	153	378	15.0	2.88	13.2	0.97	11.5	220	137	4.34	26.6	15.6	70.0	15.6	27.4	8.78	0.96	2.52	2.42	1.04	8.03	0.70	0.58	0.0056
	QK1-1047	21.3	166	313	14.5	2.69	12.4	0.87	11.8	139	137	4.48	25.6	17.0	72.1	15.6	38.5	8.06	0.85	2.61	2.23	1.08	3.61	1.19	0.44	0.0055
胜利河西剖面	4-6B	1.80	23.9	80.5	3.38	0.68	3.59	0.34	6.13	114	33.9	0.96	7.038	3.60	55.6	4.47	4.19	9.40	0.94	3.03	2.84	1.32	27.1	0.21	1.14	0.0035
	4-1^*	6.51	119	254	14.0	2.40	21.7	1.75	5.00	68.9	228	5.05	26.7	15.8	111	20.1	25.8	14.4	0.89	2.98	2.64	1.44	2.67	1.73	0.27	0.0041
	4-4^*	7.88	130	302	14.0	2.10	23.1	1.75	12.8	59.0	241	5.43	26.6	20.6	115	25.5	48.1	11.7	0.68	2.84	1.93	1.82	1.23	2.20	0.20	0.0038
	4-5^*	8.73	127	349	14.2	2.18	22.5	1.82	11.2	66.3	203	4.99	27.3	18.0	112	29.5	21.7	11.3	0.79	3.00	2.37	2.08	3.06	1.92	0.19	0.0038
	4-7^*	8.28	128	315	14.3	2.13	24.9	1.85	5.87	76.8	231	5.23	23.9	18.9	123	22.7	65.5	12.2	0.76	2.84	2.15	1.59	1.17	1.67	0.24	0.0042
	4-8^*	11.2	164	356	14.8	2.41	25.1	1.99	9.75	63.3	241	5.45	18.8	22.1	126	21.7	30.9	10.9	0.67	2.87	1.92	1.47	2.05	2.59	0.18	0.0044
	4-9^*	9.04	146	335	14.3	2.30	22.7	1.76	12.4	59.7	222	5.16	18.0	18.9	124	21.0	19.5	11.7	0.76	2.95	2.23	1.47	3.06	2.45	0.18	0.0042
	4-10^*	10.6	156	356	15.2	2.20	23.6	1.66	9.29	64.7	210	5.29	17.6	21.0	137	19.7	20.6	10.0	0.72	2.74	1.98	1.30	3.14	2.41	0.18	0.0042
	4-11^*	7.98	134	268	12.8	1.96	21.8	1.61	4.62	88.5	206	4.51	22.3	16.5	119	18.0	41.6	12.5	0.78	2.73	2.12	1.41	2.13	1.51	0.33	0.0042
	4-13^*	7.64	116	239	12.0	2.14	18.3	1.51	6.96	117	179	4.13	23.0	17.5	115	21.7	31.8	10.2	0.69	3.18	2.18	1.81	3.68	0.99	0.49	0.0039
	4-10B	1.43	33.3	111	4.55	0.87	6.02	0.55	9.58	54.3	74.4	2.43	12.8	5.28	83.1	6.17	5.39	14.1	0.86	3.32	2.86	1.36	10.1	0.61	0.49	0.0035
	4-14^*	9.14	140	300	15.0	2.36	25.3	1.83	14.0	67.9	232	5.46	25.2	21.3	144	28.2	17.5	10.9	0.70	2.99	2.11	1.88	3.88	2.06	0.23	0.0041
	4-16^*	9.64	151	328	15.6	2.26	24.3	1.78	6.84	70.9	220	5.45	22.4	20.4	130	22.4	30.5	10.8	0.76	2.75	2.10	1.44	2.32	2.13	0.22	0.0042
	4-18^*	9.36	138	316	14.8	2.18	22.9	1.81	7.59	71.6	228	5.41	25.3	21.5	151	23.3	117	10.6	0.69	3.02	2.08	1.57	0.61	1.93	0.23	0.0041
	4-20^*	8.00	114	287	13.4	1.98	24.8	1.91	6.37	80.7	212	5.31	28.6	18.6	131	23.5	27.6	11.4	0.72	3.01	2.17	1.75	2.92	1.41	0.28	0.0036
胜利河西剖面	4-22^*	8.79	131	333	14.2	2.12	21.7	1.76	7.07	76.8	212	4.80	25.4	18.6	146	23.0	46.4	11.4	0.76	2.90	2.22	1.62	1.66	1.71	0.23	0.0039
	4-24^*	8.52	132	301	13.4	2.18	22.9	1.92	6.04	76.3	225	5.23	25.6	19.4	138	26.9	86.3	11.6	0.69	3.13	2.16	2.01	0.88	1.73	0.25	0.0041
	4-26	12.5	161	235	14.1	2.15	16.7	1.67	26.6	104	157	5.49	17.1	19.5	122	19.4	30.3	8.05	0.73	2.15	1.56	1.37	3.42	1.55	0.44	0.0049
	4-12B	4.59	78.5	225	9.77	1.67	13.7	1.32	21.7	97.6	137	4.71	18.4	12.1	112	15.9	47.0	11.2	0.80	2.72	2.19	1.62	2.08	0.80	0.43	0.0043
	4-28	7.47	104	208	11.0	1.80	13.8	1.29	8.85	143	135	4.97	19.8	16.3	119	12.6	12.8	8.28	0.67	2.65	1.79	1.15	11.2	0.73	0.69	0.0044
	4-14B	0.84	18.0	61.8	3.29	0.92	3.88	0.34	16.6	197	81.1	2.33	14.0	3.86	57.8	11.1	6.14	21.0	0.85	5.07	4.33	3.37	32.1	0.09	3.18	0.0045
	4-15B	2.70	54.0	196	9.36	1.55	11.2	1.01	4.79	65.8	165	5.71	21.3	10.8	116	9.76	4.40	15.3	0.87	2.91	2.53	1.04	15.0	0.82	0.34	0.0037
	4-30	10.2	140	322	15.7	2.53	20.8	2.26	12.1	71.4	178	6.29	21.6	20.4	152	20.2	56.7	8.74	0.77	2.40	1.84	1.29	1.26	1.97	0.22	0.0043
	4-18B	3.35	67.1	233	9.42	1.53	11.1	0.99	6.26	69.3	147	5.25	20.8	11.9	121	14.2	8.33	12.4	0.79	3.20	2.54	1.51	8.33	0.97	0.30	0.0038
	UCC	4.9	84	628	10.5	2.7	12	0.9	17	320	193	5.3	21	14	92	17.3	—	—	—	—	—	—	—	—	—	—

附表 3 北羌塘坳陷胜利河西剖面和羌科1井夏里组样品稀土元素含量(μg/g)及相关参数

Appendix 3 Rare earth elements abundances(μg/g)and associated parameters of the Xiali Formation samples from Shenglihexi section and Well QK-1,North Qiangtang Depression

剖面	编号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	􀰐REE	LREE/HREE	La/Yb	(La/Yb)_N	δEu	δCe
羌科1井	QK1-73	43.2	80.3	9.47	35.8	6.98	1.26	5.84	0.99	5.34	0.97	3.02	0.54	3.34	0.49	198	8.62	12.9	8.72	0.59	0.92
	QK1-158	36.2	67.9	7.96	31.4	6.32	1.20	5.45	0.95	4.81	0.88	2.69	0.45	2.94	0.43	170	8.12	12.3	8.30	0.61	0.92
	QK1-210	38.7	72.2	8.71	33.9	6.60	1.28	5.92	1.02	5.40	0.97	2.99	0.53	3.14	0.48	182	7.89	12.3	8.31	0.61	0.91
	QK1-271	40.0	75.6	9.14	35.3	6.76	1.23	5.97	1.07	5.43	1.02	3.19	0.56	3.50	0.49	189	7.92	11.4	7.71	0.58	0.92
	QK1-411	40.1	71.3	8.83	34.0	6.51	1.21	5.48	0.95	4.97	1.03	2.91	0.51	3.19	0.48	181	8.30	12.6	8.47	0.60	0.87
	QK1-467	37.8	66.5	8.37	31.1	6.20	1.18	5.30	0.93	4.76	0.98	2.77	0.48	2.90	0.44	170	8.14	13.0	8.79	0.61	0.86
	QK1-558	32.9	60.3	7.18	27.9	5.48	1.02	4.98	0.85	4.28	0.79	2.46	0.41	2.67	0.38	152	8.02	12.3	8.31	0.59	0.90
	QK1-663	37.5	69.6	8.49	33.2	6.06	1.26	5.32	0.93	4.91	0.92	2.82	0.49	3.19	0.45	175	8.20	11.8	7.93	0.66	0.90
	QK1-751	31.2	60.5	7.18	28.4	5.58	1.07	4.81	0.89	4.39	0.88	2.39	0.38	2.70	0.38	151	7.96	11.6	7.79	0.62	0.94
	QK1-843	36.1	69.2	8.12	31.5	5.99	1.16	5.32	0.92	4.83	0.96	2.64	0.46	2.88	0.42	170	8.25	12.5	8.45	0.62	0.94
	QK1-951	37.8	70.9	8.50	32.4	6.20	1.25	5.34	0.91	4.76	0.88	2.65	0.42	2.73	0.43	175	8.67	13.8	9.33	0.65	0.92
	QK1-1047	37.9	71.5	8.51	32.7	6.30	1.42	5.46	0.93	4.87	0.88	2.68	0.40	2.79	0.42	177	8.59	13.6	9.16	0.72	0.92
胜利河西剖面	4-6B	10.3	21.8	2.28	9.0	1.91	0.46	2.01	0.25	1.50	0.28	0.74	0.11	0.72	0.09	51.4	8.03	14.3	9.62	0.71	1.04
	4-1^*	41.7	81.5	8.64	31.7	6.68	0.94	5.00	0.84	4.85	0.97	2.95	0.46	2.99	0.42	190	9.26	13.9	9.40	0.48	0.98
	4-4^*	39.8	77.2	8.48	30.3	5.58	0.79	4.99	0.78	4.33	0.93	2.84	0.46	2.99	0.44	180	9.13	13.3	8.97	0.45	0.97
	4-5^*	42.6	85.5	9.01	35.5	6.80	0.85	5.26	0.90	5.50	1.02	3.05	0.47	3.05	0.45	200	9.15	14.0	9.42	0.42	1.00
	4-7^*	40.6	85.6	9.30	33.1	6.24	0.74	4.97	0.85	4.89	0.93	2.59	0.42	3.03	0.41	194	9.71	13.4	9.03	0.39	1.02
	4-8^*	42.5	79.2	8.08	30.1	4.92	0.98	3.89	0.63	3.48	0.79	2.34	0.38	2.88	0.41	181	11.2	14.8	9.95	0.66	0.96
	4-9^*	42.2	78.6	7.85	26.6	5.05	1.01	3.63	0.61	3.64	0.69	2.09	0.34	2.50	0.35	175	11.7	16.9	11.4	0.69	0.97
	4-10^*	41.6	78.4	7.83	27.5	5.56	1.01	3.98	0.55	3.42	0.76	2.43	0.42	2.80	0.37	177	11.0	14.9	10.0	0.63	0.98
	4-11^*	34.9	68.5	7.77	28.6	5.50	1.16	4.84	0.81	4.56	0.97	2.58	0.41	2.78	0.39	164	8.45	12.6	8.46	0.67	0.96
	4-13^*	38.1	73.2	7.65	29.0	5.54	1.23	4.51	0.83	4.13	0.92	2.49	0.41	2.47	0.36	171	9.60	15.4	10.4	0.73	0.98
	4-10B	15.1	33.1	3.51	14.2	3.15	0.76	3.39	0.50	3.00	0.57	1.52	0.22	1.31	0.18	80.4	6.53	11.6	7.79	0.71	1.06
	4-14^*	44.9	79.5	8.31	29.4	5.31	1.11	4.71	0.73	4.47	0.97	2.56	0.48	3.15	0.41	186	9.64	14.3	9.61	0.67	0.92
	4-16^*	42.9	88.0	8.23	31.5	5.37	1.16	4.71	0.78	4.25	0.89	2.74	0.46	2.99	0.44	194	10.3	14.3	9.67	0.69	1.06
	4-18^*	44.7	85.1	8.99	34.9	6.15	1.28	5.19	0.94	5.05	0.97	2.89	0.46	3.16	0.43	200	9.49	14.1	9.54	0.68	0.97
	4-20^*	40.4	88.4	8.72	36.9	7.41	1.39	5.94	1.00	5.13	1.07	3.06	0.51	3.03	0.44	203	9.08	13.3	8.99	0.62	1.08
	4-22^*	41.2	85.5	8.75	36.0	6.45	1.31	5.52	0.94	4.52	0.94	2.88	0.49	3.01	0.42	198	9.58	13.7	9.23	0.66	1.03
	4-24^*	42.0	80.7	9.11	32.0	5.73	1.21	5.36	0.93	4.63	0.96	2.96	0.44	2.96	0.40	189	9.16	14.2	9.57	0.66	0.95
	4-26	30.5	60.6	6.01	22.4	3.98	0.90	3.83	0.54	3.53	0.76	2.32	0.36	2.44	0.30	138	8.84	12.5	8.44	0.69	1.02
胜利河西剖面	4-12B	26.6	57.5	6.00	23.3	4.75	1.01	4.74	0.68	4.12	0.81	2.29	0.33	2.16	0.28	135	7.73	12.3	8.28	0.64	1.05
	4-28	29.2	63.2	6.65	25.9	5.31	1.19	5.24	0.75	4.39	0.84	2.42	0.35	2.28	0.30	148	7.93	12.8	8.62	0.68	1.05
	4-14B	16.7	36.1	3.80	15.3	3.29	0.90	3.90	0.52	2.98	0.55	1.47	0.18	1.12	0.14	87.0	7.01	14.9	10.0	0.76	1.05
	4-15B	27.2	59.4	6.52	26.0	5.48	1.30	5.71	0.81	4.84	0.93	2.64	0.38	2.44	0.30	144	6.98	11.2	7.54	0.70	1.04
	4-30	37.6	73.9	7.33	26.7	4.82	0.99	4.46	0.68	4.41	0.94	2.83	0.43	2.98	0.40	168	8.84	12.6	8.52	0.64	1.01
	4-18B	30.2	65.2	6.92	26.7	5.54	1.21	5.46	0.78	4.78	0.92	2.57	0.37	2.33	0.30	153	7.75	12.9	8.73	0.66	1.05
	UCC	31.0	63.0	7.10	27.0	4.70	1.00	4.00	0.70	3.90	0.83	2.30	0.30	1.96	0.31	148	—	—	—	—	—
	PAAS	38.0	79.6	8.83	33.9	5.55	1.08	4.66	0.77	4.68	0.99	2.85	0.41	2.82	0.43	185	—	—	—	—	—
	球粒陨石	0.31	0.81	0.12	0.60	0.20	0.07	0.26	0.05	0.32	0.07	0.21	0.03	0.21	0.03	—	—	—	—	—	—

附表 3 北羌塘坳陷胜利河西剖面和羌科1井夏里组样品稀土元素含量(μg/g)及相关参数

Appendix 3 Rare earth elements abundances(μg/g)and associated parameters of the Xiali Formation samples from Shenglihexi section and Well QK-1,North Qiangtang Depression

剖面	编号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	􀰐REE	LREE/HREE	La/Yb	(La/Yb)_N	δEu	δCe
羌科1井	QK1-73	43.2	80.3	9.47	35.8	6.98	1.26	5.84	0.99	5.34	0.97	3.02	0.54	3.34	0.49	198	8.62	12.9	8.72	0.59	0.92
	QK1-158	36.2	67.9	7.96	31.4	6.32	1.20	5.45	0.95	4.81	0.88	2.69	0.45	2.94	0.43	170	8.12	12.3	8.30	0.61	0.92
	QK1-210	38.7	72.2	8.71	33.9	6.60	1.28	5.92	1.02	5.40	0.97	2.99	0.53	3.14	0.48	182	7.89	12.3	8.31	0.61	0.91
	QK1-271	40.0	75.6	9.14	35.3	6.76	1.23	5.97	1.07	5.43	1.02	3.19	0.56	3.50	0.49	189	7.92	11.4	7.71	0.58	0.92
	QK1-411	40.1	71.3	8.83	34.0	6.51	1.21	5.48	0.95	4.97	1.03	2.91	0.51	3.19	0.48	181	8.30	12.6	8.47	0.60	0.87
	QK1-467	37.8	66.5	8.37	31.1	6.20	1.18	5.30	0.93	4.76	0.98	2.77	0.48	2.90	0.44	170	8.14	13.0	8.79	0.61	0.86
	QK1-558	32.9	60.3	7.18	27.9	5.48	1.02	4.98	0.85	4.28	0.79	2.46	0.41	2.67	0.38	152	8.02	12.3	8.31	0.59	0.90
	QK1-663	37.5	69.6	8.49	33.2	6.06	1.26	5.32	0.93	4.91	0.92	2.82	0.49	3.19	0.45	175	8.20	11.8	7.93	0.66	0.90
	QK1-751	31.2	60.5	7.18	28.4	5.58	1.07	4.81	0.89	4.39	0.88	2.39	0.38	2.70	0.38	151	7.96	11.6	7.79	0.62	0.94
	QK1-843	36.1	69.2	8.12	31.5	5.99	1.16	5.32	0.92	4.83	0.96	2.64	0.46	2.88	0.42	170	8.25	12.5	8.45	0.62	0.94
	QK1-951	37.8	70.9	8.50	32.4	6.20	1.25	5.34	0.91	4.76	0.88	2.65	0.42	2.73	0.43	175	8.67	13.8	9.33	0.65	0.92
	QK1-1047	37.9	71.5	8.51	32.7	6.30	1.42	5.46	0.93	4.87	0.88	2.68	0.40	2.79	0.42	177	8.59	13.6	9.16	0.72	0.92
胜利河西剖面	4-6B	10.3	21.8	2.28	9.0	1.91	0.46	2.01	0.25	1.50	0.28	0.74	0.11	0.72	0.09	51.4	8.03	14.3	9.62	0.71	1.04
	4-1^*	41.7	81.5	8.64	31.7	6.68	0.94	5.00	0.84	4.85	0.97	2.95	0.46	2.99	0.42	190	9.26	13.9	9.40	0.48	0.98
	4-4^*	39.8	77.2	8.48	30.3	5.58	0.79	4.99	0.78	4.33	0.93	2.84	0.46	2.99	0.44	180	9.13	13.3	8.97	0.45	0.97
	4-5^*	42.6	85.5	9.01	35.5	6.80	0.85	5.26	0.90	5.50	1.02	3.05	0.47	3.05	0.45	200	9.15	14.0	9.42	0.42	1.00
	4-7^*	40.6	85.6	9.30	33.1	6.24	0.74	4.97	0.85	4.89	0.93	2.59	0.42	3.03	0.41	194	9.71	13.4	9.03	0.39	1.02
	4-8^*	42.5	79.2	8.08	30.1	4.92	0.98	3.89	0.63	3.48	0.79	2.34	0.38	2.88	0.41	181	11.2	14.8	9.95	0.66	0.96
	4-9^*	42.2	78.6	7.85	26.6	5.05	1.01	3.63	0.61	3.64	0.69	2.09	0.34	2.50	0.35	175	11.7	16.9	11.4	0.69	0.97
	4-10^*	41.6	78.4	7.83	27.5	5.56	1.01	3.98	0.55	3.42	0.76	2.43	0.42	2.80	0.37	177	11.0	14.9	10.0	0.63	0.98
	4-11^*	34.9	68.5	7.77	28.6	5.50	1.16	4.84	0.81	4.56	0.97	2.58	0.41	2.78	0.39	164	8.45	12.6	8.46	0.67	0.96
	4-13^*	38.1	73.2	7.65	29.0	5.54	1.23	4.51	0.83	4.13	0.92	2.49	0.41	2.47	0.36	171	9.60	15.4	10.4	0.73	0.98
	4-10B	15.1	33.1	3.51	14.2	3.15	0.76	3.39	0.50	3.00	0.57	1.52	0.22	1.31	0.18	80.4	6.53	11.6	7.79	0.71	1.06
	4-14^*	44.9	79.5	8.31	29.4	5.31	1.11	4.71	0.73	4.47	0.97	2.56	0.48	3.15	0.41	186	9.64	14.3	9.61	0.67	0.92
	4-16^*	42.9	88.0	8.23	31.5	5.37	1.16	4.71	0.78	4.25	0.89	2.74	0.46	2.99	0.44	194	10.3	14.3	9.67	0.69	1.06
	4-18^*	44.7	85.1	8.99	34.9	6.15	1.28	5.19	0.94	5.05	0.97	2.89	0.46	3.16	0.43	200	9.49	14.1	9.54	0.68	0.97
	4-20^*	40.4	88.4	8.72	36.9	7.41	1.39	5.94	1.00	5.13	1.07	3.06	0.51	3.03	0.44	203	9.08	13.3	8.99	0.62	1.08
	4-22^*	41.2	85.5	8.75	36.0	6.45	1.31	5.52	0.94	4.52	0.94	2.88	0.49	3.01	0.42	198	9.58	13.7	9.23	0.66	1.03
	4-24^*	42.0	80.7	9.11	32.0	5.73	1.21	5.36	0.93	4.63	0.96	2.96	0.44	2.96	0.40	189	9.16	14.2	9.57	0.66	0.95
	4-26	30.5	60.6	6.01	22.4	3.98	0.90	3.83	0.54	3.53	0.76	2.32	0.36	2.44	0.30	138	8.84	12.5	8.44	0.69	1.02
胜利河西剖面	4-12B	26.6	57.5	6.00	23.3	4.75	1.01	4.74	0.68	4.12	0.81	2.29	0.33	2.16	0.28	135	7.73	12.3	8.28	0.64	1.05
	4-28	29.2	63.2	6.65	25.9	5.31	1.19	5.24	0.75	4.39	0.84	2.42	0.35	2.28	0.30	148	7.93	12.8	8.62	0.68	1.05
	4-14B	16.7	36.1	3.80	15.3	3.29	0.90	3.90	0.52	2.98	0.55	1.47	0.18	1.12	0.14	87.0	7.01	14.9	10.0	0.76	1.05
	4-15B	27.2	59.4	6.52	26.0	5.48	1.30	5.71	0.81	4.84	0.93	2.64	0.38	2.44	0.30	144	6.98	11.2	7.54	0.70	1.04
	4-30	37.6	73.9	7.33	26.7	4.82	0.99	4.46	0.68	4.41	0.94	2.83	0.43	2.98	0.40	168	8.84	12.6	8.52	0.64	1.01
	4-18B	30.2	65.2	6.92	26.7	5.54	1.21	5.46	0.78	4.78	0.92	2.57	0.37	2.33	0.30	153	7.75	12.9	8.73	0.66	1.05
	UCC	31.0	63.0	7.10	27.0	4.70	1.00	4.00	0.70	3.90	0.83	2.30	0.30	1.96	0.31	148	—	—	—	—	—
	PAAS	38.0	79.6	8.83	33.9	5.55	1.08	4.66	0.77	4.68	0.99	2.85	0.41	2.82	0.43	185	—	—	—	—	—
	球粒陨石	0.31	0.81	0.12	0.60	0.20	0.07	0.26	0.05	0.32	0.07	0.21	0.03	0.21	0.03	—	—	—	—	—	—

图 6 北羌塘坳陷胜利河西剖面和羌科1井夏里组样品经球粒陨石标准化的稀土元素配分曲线

Fig.6 Chondrite-normalized rare earth element distribution diagrams of the Xiali Formation from Shenglihexi section and Well QK-1,North Qiangtang Depression

图 7 北羌塘坳陷胜利河西剖面和羌科1井夏里组样品A-CN-K三角图(据Nesbitt and Young,1982) A:Al₂O₃;CN:CaO^*+Na₂O;K:K₂O;CIA: 化学蚀变指数

Fig.7 A-CN-K ternary diagram of the Xiali Formation from Shenglihexi section and Well QK-1, North Qiangtang Depression (after Nesbitt and Young,1982)

图 8 北羌塘坳陷胜利河西剖面和羌科1井夏里组碎屑岩化学风化指数(CIA)及其影响因素评价图

Fig.8 Binary diagrams for evaluating major factors affecting CIA values of the Xiali Formation clastic rocks from Shenglihexi section and Well QK-1,North Qiangtang Depression

图 9 北羌塘坳陷胜利河西剖面和羌科1井夏里组碎屑岩物源属性判别图解

Fig.9 Provenance discrimination diagrams for the Xiali Formation clastic rocks from Shenglihexi section and Well QK-1, North Qiangtang Depression

图 10 北羌塘坳陷胜利河西剖面和羌科1井夏里组硅质碎屑岩多维构造背景判别图 a—高硅型碎屑岩; b—低硅型碎屑岩(Verma and Armstrong-Altrin,2013)。沱沱河剖面夏里组砂岩数据来源于李焕纪等(2024)

Fig.10 Multidimensional tectonic setting discrimination diagrams for the Xiali Formation siliciclastic rocks from Shenglihexi section and Well QK-1,North Qiangtang Depression

图 11 羌塘盆地中侏罗统夏里组沉积期构造演化图(非等比例)

Fig.11 Tectonic evolution diagram of Qiangtang Basin during the deposition period of Middle Jurassic Xiali Formation(no-equal drawing)

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