湘西北寒武纪早期碳同位素异常事件识别:基于湘张地1井地层对比与古环境响应<sup>*</sup>

doi:10.7605/gdlxb.2026.056

古地理学报 ›› 2026, Vol. 28 ›› Issue (1): 264-277. doi: 10.7605/gdlxb.2026.056

• 岩相古地理学及沉积学 • 上一篇下一篇

湘西北寒武纪早期碳同位素异常事件识别:基于湘张地1井地层对比与古环境响应^*

彭中勤¹^,²^,³(), 程青松⁴(), 苗凤彬¹^,²^,³, 黄亚飞¹^,²^,³

1 中国地质调查局南方复杂构造区页岩油气成藏理论与工程技术创新中心,湖北武汉 430205
2 中国地质调查局武汉地质调查中心(中南地质科技创新中心),湖北武汉 430205
3 中国地质调查局南方复杂构造区页岩气研究中心,湖北武汉 430205
4 中国石油浙江油田公司,浙江杭州 310023

收稿日期:2025-06-30 修回日期:2025-10-17 出版日期:2026-02-01 发布日期:2026-02-09
通讯作者: 程青松,男,1990年生,博士,高级工程师,主要从事油气勘探和地球化学研究工作。E-mail: qingsongyk@qq.com。
作者简介:
彭中勤,男,1981年生,博士,正高级工程师,主要从事页岩气地质调查评价和研究。E-mail: 17360988@qq.com。
基金资助:
*中国地质调查局地质调查项目(DD20240047); 中国地质调查局地质调查项目(DD20160179); 战略性矿产资源调查评价项目(2024ZRYJDC017)

Identification of carbon isotope anomaly events in the Early Cambrian of northwestern Hunan Province: based on stratigraphic correlation and paleoenvironmental response from Well Xiangzhangdi-1

PENG Zhongqin¹^,²^,³(), CHENG Qingsong⁴(), MIAO Fengbin¹^,²^,³, HUANG Yafei¹^,²^,³

1 Technology Innovation Center for Shale Oil and Gas Accumulation Theory and Engineering in Southern Complex Structural Area,;CGS,Wuhan 430205,China
2 Wuhan Center of Geological Survey,CGS,Wuhan 430205,China
3 Shale Gas Research Center for Southern Complex Structural Area,CGS,Wuhan 430205,China
4 Zhejiang Oilfield Company,PetroChina,Hangzhou 310023,China

Received:2025-06-30 Revised:2025-10-17 Online:2026-02-01 Published:2026-02-09
Contact: CHENG Qingsong,born in 1990,Ph.D.,senior engineer,is engaged in researches on oil and gas exploration and geochemistry. E-mail: qingsongyk@qq.com.
About author:
PENG Zhongqin,born in 1981,Ph.D.,professorate senior engineer,is engaged in research on shale gas geological investigation,evaluation and research. E-mail: 17360988@qq.com.
Supported by:
Geological Survey Projects(DD20240047); Geological Survey Projects(DD20160179); Strategic Mineral Resources Survey and Evaluation Project of China Geological Survey(2024ZRYJDC017)

摘要/Abstract

摘要：

湘西北地区寒武系留茶坡组与牛蹄塘组发育富有机质页岩,具有良好的页岩气勘探潜力。针对该区寒武纪早期地层对比精度不足及碳同位素演化机制不明的问题,基于湘张地1井(井深2018.25 m,岩心获取率98%)钻井岩心,系统采集133件碳酸盐岩样品开展碳( $δ 1 3$ C)、氧( $δ 1 8$ O)同位素演化趋势分析,并聚焦碳同位素漂移事件及其地层对比意义。该研究在湘西北斜坡相区识别出寒武纪早期5次显著的 $δ 1 3$ C负异常(幅度达12.1‰)和3次正异常(幅度近9‰)事件,揭示出其与全球BACE、ZHUCE等碳循环事件的同步性。其中埃迪卡拉系—寒武系界线(BACE事件)可与 $δ 1 3$ C负漂移峰值(-9.8‰)对应,与西伯利亚、摩洛哥及华南台地相记录一致; 正漂移事件(ZHUCE、CARE)与高有机质丰度层段(TOC峰值达10.5%)耦合,表明生物繁盛驱动的碳埋藏增强是 $δ 1 3$ C正漂移的主控因素。据此建立了华南斜坡相寒武纪早期碳同位素地层框架,其可为区域页岩气勘探甜点区预测提供可靠的化学地层学依据。

关键词: 碳同位素, 地层对比, 古环境, 寒武纪, 湘西北地区

Abstract:

During the Early Cambrian,organic-rich shales of the Liuchapo Formation and Niutitang Formation developed in northwestern Hunan,exhibiting good shale gas exploration potential. To address the issues of insufficient precision in Early Cambrian stratigraphic correlation and unclear mechanisms of carbon isotope evolution,this study systematically collected 133 carbonate rock samples from the drilling core of the Well Xiangzhangdi-1 (with a well depth of 2018.25 m and a core recovery rate of 98%). Analyses were conducted on the evolution trends of carbon and oxygen isotopes( $δ 1 3$ C, $δ 1 8$ O),as well as studies on shift events and stratigraphic correlation. Five negative $δ 1 3$ C anomalies(with amplitudes up to 12.1‰)and three positive anomaly events(with amplitudes approaching 9‰)were identified in the Early Cambrian slope facies area of northwestern Hunan,revealing their synchrony with global carbon cycle events such as BACE and ZHUCE. The results show that the Ediacaran-Cambrian boundary(BACE event)corresponds to the peak of negative $δ 1 3$ C shift(-9.8‰),consistent with records from Siberia,Morocco,and the South China platform facies. Positive shift events(ZHUCE,CARE)are coupled with intervals of high organic matter abundance(with TOC peak values reaching 10.5%),indicating that enhanced carbon burial driven by biological prosperity is the main controlling factor for positive $δ 1 3$ C shifts. This study establishes a carbon isotope stratigraphic framework for Early Cambrian boreholes in the South China slope facies,providing a chemostratigraphic basis for regional shale gas sweet spot prediction.

Key words: carbon isotope, stratigraphic correlation, palaeoenvironment, Cambrian, northwestern Hunan Province

中图分类号:

P597

彭中勤, 程青松, 苗凤彬, 黄亚飞. 湘西北寒武纪早期碳同位素异常事件识别:基于湘张地1井地层对比与古环境响应^*[J]. 古地理学报, 2026, 28(1): 264-277.

PENG Zhongqin, CHENG Qingsong, MIAO Fengbin, HUANG Yafei. Identification of carbon isotope anomaly events in the Early Cambrian of northwestern Hunan Province: based on stratigraphic correlation and paleoenvironmental response from Well Xiangzhangdi-1[J]. Journal of Palaeogeography（Chinese Edition）, 2026, 28(1): 264-277.

http://www.gdlxb.cn/CN/Y2026/V28/I1/264

图/表 7

图 1 湖南张家界地区湘张地1井位置及区域地质图(据 Li et al., 2014;Chu and Wei,2018;彭中勤等,2019;有修改)

Fig.1 Location of Well Xiangzhangdi-1 and geological map of Zhangjiajie area,Hunan Province (modified from Li et al., 2014;Chu and Wei,2018;Peng et al., 2019)

图 2 湖南张家界地区寒武系地层划分与对比

Fig.2 Subdivision and correlation of the Cambrian in Zhangjiajie area,Hunan Province

图 3 湖南张家界地区湘张地1井寒武系岩心照片 a—井深1994.45~2000.95 m,灯影组白云岩及留茶坡组硅质泥岩夹泥质白云岩; b—井深1944.65~1951.15 m,牛蹄塘组碳质泥岩

Fig.3 Core photos of the Cambrian from Well Xiangzhangdi-1 in Zhangjiajie area,Hunan Province

图 4 湖南张家界地区湘张地1井寒武系 δ¹³C _PDB和

δ 18 O P D B

值相关性

Fig.4 Correlation between δ¹³C _PDB and

δ 18 O P D B

values of the Cambrian from Well Xiangzhangdi-1 in Zhangjiajie area,Hunan Province

图 4 湖南张家界地区湘张地1井寒武系 δ¹³C _PDB和

δ 18 O P D B

值相关性

Fig.4 Correlation between δ¹³C _PDB and

δ 18 O P D B

values of the Cambrian from Well Xiangzhangdi-1 in Zhangjiajie area,Hunan Province

表 1 湖南张家界地区湘张地1井寒武系C、O稳定同位素测试结果

Table 1 Stable carbon and oxygen isotopic data of the Cambrian from Well Xiangzhangdi-1 in Zhangjiajie area,Hunan Province

序号	样品编号	岩性	深度/m	$δ 13 C P D B$ /‰	$δ 18 O P D B$ /‰	序号	样品编号	岩性	深度/m	$δ 13 C P D B$ /‰	$δ 18 O P D B$ /‰
1	XZD-Z₂dn-1T	硅质白云岩	2006.95	1.3	-1.7	68	XZD-Э ₂a-1T	云质砂岩	1550.35	-1.7	-8.8
	XZD-Z₂dn-1T^*	硅质白云岩	2006.95	1.3	-1.8		XZD-Э ₂a-1T^*	云质砂岩	1550.35	-1.6	-8.6
2	XZD-Z₂dn-2T	硅质白云岩	2004.35	2.2	-3.8	69	XZD-Э ₂a-2T	云质砂岩	1548.50	-0.7	-5.2
3	XZD-Z₂dn-3T	硅质白云岩	2000.90	0.6	-4.9	70	XZD-Э ₂a-3T	云质砂岩	1545.70	-0.9	-11.5
4	XZD-Z₂dn-4T	硅质白云岩	1999.20	-1.4	-6.4	71	XZD-Э ₂a-4T	灰岩	1542.55	-1.3	-10.5
5	XZD-Z₂dn-5T	硅质白云岩	1998.15	-1.8	-5.3	72	XZD-Э ₂a-5T	灰岩	1541.20	-0.2	-9.7
6	XZD-Z₂dn-6T	硅质白云岩	1996.60	-5.4	-5.7	73	XZD-Э ₂a-6T	灰岩	1536.15	0.0	-8.8
7	XZD-Э ₁n-8T	硅质灰岩	1993.00	-7.2	-10.5	74	XZD-Э ₂a-7T	灰岩	1528.48	4.3	-7.9
	XZD-Э ₁n-8T^*	硅质灰岩	1993.00	-7.1	-10.6	75	XZD-Э ₂a-8T	灰岩	1520.40	-1.0	-8.8
8	XZD-Э ₁n-12T	灰岩	1987.50	-9.8	-8.3	76	XZD-Э ₂a-9T	灰岩	1515.75	-1.5	-9.0
9	XZD-Э ₁n-9T	硅质灰岩	1986.95	-2.5	-9.8	77	XZD-Э ₂a-10T	灰岩	1511.20	-1.9	-8.6
10	XZD-Э ₁n-10T	硅质灰岩	1985.20	-8.0	-8.4		XZD-Э ₂a-10T^*	灰岩	1511.20	-1.9	-8.6
11	XZD-Э ₁n-13T	灰岩	1973.00	-2.1	-11.6	78	XZD-Э ₂a-11T	灰岩	1506.80	-0.7	-8.8
12	XZD-Э ₁n-14T	灰岩	1969.00	-1.2	-11.4	79	XZD-Э ₂a-12T	灰岩	1502.90	0.1	-8.4
	XZD-Э ₁n-14T	灰岩	1969.00	-1.2	-11.5	80	XZD-Э ₂a-13T	灰岩	1497.45	-0.3	-7.9
13	XZD-Э ₁n-15T	灰岩	1966.10	-0.8	-11.2	81	XZD-Э ₂a-14T	灰岩	1492.25	0.3	-8.7
14	XZD-Э ₁n-16T	灰岩	1962.35	-11.0	-11.2	82	XZD-Э ₂a-15T	灰岩	1485.30	-0.5	-9.8
15	XZD-Э ₁n-17T	灰岩	1959.60	-10.3	-11.1	83	XZD-Э ₂a-16T	灰岩	1481.05	-0.5	-9.7
16	XZD-Э ₁n-18T	灰岩	1953.40	-10.0	-10.8	84	XZD-Э ₂a-17T	灰岩	1477.58	-1.0	-9.7
	XZD-Э ₁n-18T^*	灰岩	1953.40	-10.0	-10.9		XZD-Э ₂a-17T^*	灰岩	1477.58	-1.0	-9.7
17	XZD-Э ₁n-19T	灰岩	1945.75	-4.0	-10.4	85	XZD-Э ₂a-18T	灰岩	1467.35	-1.2	-10.5
18	XZD-Э ₁n-21T	灰岩	1916.53	-3.1	-11.1	86	XZD-Э ₂a-19T	灰岩	1461.10	-3.0	-9.8
19	XZD-Э ₁n-22T	灰岩	1909.30	-2.8	-10.8	87	XZD-Э ₂a-20T	灰岩	1456.55	-1.5	-9.8
20	XZD-Э ₁n-23T	灰岩	1905.00	-3.8	-10.3	88	XZD-Э ₂a-21T	灰岩	1450.90	-3.3	-9.6
21	XZD-Э ₁n-24T	灰岩	1892.62	-2.7	-11.3	89	XZD-Э ₂a-22T	灰岩	1440.85	-1.0	-9.8
22	XZD-P-6T	灰岩	1818.90	-3.8	-9.5	90	XZD-Э ₂a-23T	灰岩	1434.30	-2.3	-9.7
23	XZD-P-5T	灰岩	1805.70	-1.6	-11.1	91	XZD-Э ₂a-24T	灰岩	1427.15	-1.3	-9.6
24	XZD-P-4T	灰岩	1796.80	-5.5	-9.4	92	XZD-Э ₂a-25T	灰岩	1419.10	-1.3	-9.1
25	XZD-P-3T	灰岩	1792.10	-2.0	-11.5	93	XZD-Э ₂a-26T	灰岩	1415.45	1.3	-8.6
26	XZD-Э ₂q-1T	灰岩	1721.40	-1.4	-8.9		XZD-Э ₂a-26T^*	灰岩	1415.45	1.3	-8.5
27	XZD-Э ₂q-2T	灰岩	1719.80	-1.5	-8.7	94	XZD-Э ₂a-27T	灰岩	1411.25	-1.1	-8.9
28	XZD-Э ₂q-3T	灰岩	1715.90	-0.3	-9.2	95	XZD-Э ₂a-28T	灰岩	1405.60	-1.0	-9.8
29	XZD-Э ₂q-4T	灰岩	1712.50	0.7	-9.0	96	XZD-Э ₂a-29T	灰岩	1405.05	-1.0	-9.7
30	XZD-Э ₂q-5T	灰岩	1708.70	-0.4	-8.6	97	XZD-Э ₂a-30T	灰岩	1400.30	-0.8	-9.3
31	XZD-Э ₂q-6T	灰岩	1699.35	-0.1	-6.7	98	XZD-Э ₂a-31T	灰岩	1395.55	-0.5	-9.4
32	XZD-Э ₂q-7T	灰岩	1692.15	0.1	-9.0	99	XZD-Э ₂a-32T	灰岩	1390.95	-1.5	-9.0
33	XZD-Э ₂q-8T	灰岩	1688.90	1.0	-7.5	100	XZD-Э ₂a-33T	灰岩	1386.40	-0.5	-9.0
34	XZD-Э ₂q-9T	灰岩	1685.75	0.2	-8.9		XZD-Э ₂a-33T	灰岩	1386.40	-0.5	-9.0
	XZD-Э ₂q-9T^*	灰岩	1685.75	0.2	-8.8	101	XZD-Э ₂a-34T	灰岩	1381.05	-1.4	-8.7
35	XZD-Э ₂q-10T	灰岩	1682.05	1.2	-6.7	102	XZD-Э ₂a-35T	灰岩	1378.10	-2.0	-9.2
36	XZD-Э ₂q-11T	灰岩	1678.70	0.5	-8.2	103	XZD-Э ₂a-36T	灰岩	1372.65	-0.7	-8.5
37	XZD-Э ₂q-12T	灰岩	1675.30	1.6	-7.4	104	XZD-Э ₂a-37T	灰岩	1365.50	-0.1	-7.4
38	XZD-Э ₂q-13T	灰岩	1672.10	2.3	-7.3	105	XZD-Э ₂a-38T	灰岩	1357.40	0.4	-7.7
39	XZD-Э ₂q-14T	灰岩	1668.25	2.5	-7.2	106	XZD- Э₂a-39T	灰岩	1351.70	0.2	-7.7
40	XZD-Э ₂q-15T	灰岩	1665.10	2.6	-6.8		XZD-Э ₂a-39T^*	灰岩	1351.70	0.2	-7.6
41	XZD-Э ₂q-16T	灰岩	1662.80	2.7	-5.8	107	XZD-Э ₂a-40T	灰岩	1346.90	0.0	-7.6
	XZD-Э ₂q-16T^*	灰岩	1662.80	2.7	-5.7	108	XZD-Э ₂a-41T	灰岩	1339.20	1.0	-8.4
42	XZD-Э ₂q-17T	灰岩	1660.05	2.5	-6.4	109	XZD-Э ₂a-42T	灰岩	1333.30	1.3	-8.5
43	XZD-Э ₂q-18T	灰岩	1657.00	2.7	-5.8	110	XZD-Э ₂a-43T	灰岩	1326.80	1.8	-7.8
44	XZD-Э ₂q-19T	灰岩	1654.30	2.9	-6.0	111	XZD-Э ₂a-44T	灰岩	1322.20	1.4	-7.4
45	XZD-Э ₂q-20T	灰岩	1649.60	2.6	-6.0	112	XZD-Э ₂a-45T	灰岩	1314.60	1.9	-7.2
46	XZD-Э ₂q-21T	灰岩	1645.58	2.4	-6.2		XZD-Э ₂a-45T*	灰岩	1314.60	2.0	-7.2
47	XZD-Э ₂q-22T	灰岩	1641.20	2.3	-5.6	113	XZD-Э ₂a-46T	灰岩	1310.50	1.6	-8.8
48	XZD-Э ₂q-23T	灰岩	1636.30	2.1	-6.2	114	XZD-Э ₂a-47T	灰岩	1304.53	0.7	-9.8
49	XZD-Э ₂q-24T	灰岩	1630.45	1.8	-6.1	115	XZD-Э ₂a-48T	灰岩	1296.70	1.7	-8.4
	XZD-Э ₂q-24T^*	灰岩	1630.45	1.8	-6.1	116	XZD-Э ₂a-49T	灰岩	1289.80	2.0	-10.4
50	XZD-Э ₂q-25T	灰岩	1626.30	1.5	-6.4	117	XZD-Э ₂a-50T	白云岩	1282.70	1.6	-11.0
51	XZD-Э ₂q-26T	灰岩	1622.00	0.2	-7.5	118	XZD-Э ₂a-51T	白云岩	1275.40	0.5	-8.3
52	XZD-Э ₂q-27T	灰岩	1619.00	-0.7	-8.9		XZD-Э ₂a-51T^*	白云岩	1275.40	0.5	-8.2
53	XZD-Э ₂q-28T	灰岩	1613.20	-5.7	-8.6	119	XZD-Э ₂a-52T	白云岩	1269.10	-0.1	-8.2
54	XZD-Э ₂q-29T	灰岩	1608.80	-0.4	-9.9	120	XZD-Э ₂a-53T	白云岩	1262.30	0.1	-7.9
55	XZD-Э ₂q-30T	灰岩	1603.80	-0.3	-9.0	121	XZD-Э ₂a-54T	白云岩	1256.40	0.1	-6.3
56	XZD-Э ₂q-31T	灰岩	1600.43	0.0	-8.0	122	XZD-Э ₂a-55T	白云岩	1250.30	-0.1	-6.8
	XZD-Э ₂q-31T^*	灰岩	1600.43	0.0	-8.0	123	XZD-Э ₂a-56T	白云岩	1240.60	-0.9	-6.7
57	XZD-Э ₂q-32T	灰岩	1594.80	-0.1	-4.6	124	XZD-Э ₂a-57T	灰岩	1238.70	-0.6	-6.5
58	XZD-Э ₂q-33T	灰岩	1590.70	-0.3	-6.5	125	XZD-Э ₂a-58T	灰岩	1232.40	-1.3	-6.3
59	XZD-Э ₂q-34T	灰岩	1587.45	0.0	-8.4	126	XZD-Э ₂a-59T	灰岩	1227.55	-1.9	-6.1
60	XZD-Э ₂q-35T	灰岩	1582.45	0.5	-7.2	127	XZD-Э ₂a-60T	灰岩	1225.25	-2.2	-5.6
61	XZD-Э ₂q-36T	灰岩	1579.60	2.1	-8.2	128	XZD-Э ₂a-61T	灰岩	1219.40	-1.9	-6.0
62	XZD-Э ₂q-37T	泥晶白云岩	1575.00	1.7	-6.8		XZD-Э ₂a-61T^*	灰岩	1219.40	-1.9	-6.1
	XZD-Э ₂q-37T^*	泥晶白云岩	1575.00	1.7	-6.9	129	XZD-Э ₂a-62T	灰岩	1209.20	-1.9	-6.3
63	XZD-Э ₂q-38T	泥晶白云岩	1572.00	1.5	-7.3	130	XZD-Э ₂a-63T	灰岩	1201.20	-1.2	-6.0
64	XZD-Э ₂q-39T	泥晶白云岩	1565.60	1.3	-5.3	131	XZD-Э ₂a-64T	灰岩	1195.40	-0.8	-6.0
65	XZD-Э ₂q-40T	泥晶白云岩	1560.95	1.1	-5.3	132	XZD-Э ₂a-65T	灰岩	1192.20	-0.8	-5.9
66	XZD-Э ₂q-41T	泥晶白云岩	1554.60	0.7	-4.9	133	XZD-Э ₂a-66T	灰岩	1184.55	-0.6	-11.2
67	XZD-Э ₂q-42T	泥晶白云岩	1553.30	0.8	-7.9	注: ^*为质量监控样品,共17件

表 1 湖南张家界地区湘张地1井寒武系C、O稳定同位素测试结果

Table 1 Stable carbon and oxygen isotopic data of the Cambrian from Well Xiangzhangdi-1 in Zhangjiajie area,Hunan Province

序号	样品编号	岩性	深度/m	$δ 13 C P D B$ /‰	$δ 18 O P D B$ /‰	序号	样品编号	岩性	深度/m	$δ 13 C P D B$ /‰	$δ 18 O P D B$ /‰
1	XZD-Z₂dn-1T	硅质白云岩	2006.95	1.3	-1.7	68	XZD-Э ₂a-1T	云质砂岩	1550.35	-1.7	-8.8
	XZD-Z₂dn-1T^*	硅质白云岩	2006.95	1.3	-1.8		XZD-Э ₂a-1T^*	云质砂岩	1550.35	-1.6	-8.6
2	XZD-Z₂dn-2T	硅质白云岩	2004.35	2.2	-3.8	69	XZD-Э ₂a-2T	云质砂岩	1548.50	-0.7	-5.2
3	XZD-Z₂dn-3T	硅质白云岩	2000.90	0.6	-4.9	70	XZD-Э ₂a-3T	云质砂岩	1545.70	-0.9	-11.5
4	XZD-Z₂dn-4T	硅质白云岩	1999.20	-1.4	-6.4	71	XZD-Э ₂a-4T	灰岩	1542.55	-1.3	-10.5
5	XZD-Z₂dn-5T	硅质白云岩	1998.15	-1.8	-5.3	72	XZD-Э ₂a-5T	灰岩	1541.20	-0.2	-9.7
6	XZD-Z₂dn-6T	硅质白云岩	1996.60	-5.4	-5.7	73	XZD-Э ₂a-6T	灰岩	1536.15	0.0	-8.8
7	XZD-Э ₁n-8T	硅质灰岩	1993.00	-7.2	-10.5	74	XZD-Э ₂a-7T	灰岩	1528.48	4.3	-7.9
	XZD-Э ₁n-8T^*	硅质灰岩	1993.00	-7.1	-10.6	75	XZD-Э ₂a-8T	灰岩	1520.40	-1.0	-8.8
8	XZD-Э ₁n-12T	灰岩	1987.50	-9.8	-8.3	76	XZD-Э ₂a-9T	灰岩	1515.75	-1.5	-9.0
9	XZD-Э ₁n-9T	硅质灰岩	1986.95	-2.5	-9.8	77	XZD-Э ₂a-10T	灰岩	1511.20	-1.9	-8.6
10	XZD-Э ₁n-10T	硅质灰岩	1985.20	-8.0	-8.4		XZD-Э ₂a-10T^*	灰岩	1511.20	-1.9	-8.6
11	XZD-Э ₁n-13T	灰岩	1973.00	-2.1	-11.6	78	XZD-Э ₂a-11T	灰岩	1506.80	-0.7	-8.8
12	XZD-Э ₁n-14T	灰岩	1969.00	-1.2	-11.4	79	XZD-Э ₂a-12T	灰岩	1502.90	0.1	-8.4
	XZD-Э ₁n-14T	灰岩	1969.00	-1.2	-11.5	80	XZD-Э ₂a-13T	灰岩	1497.45	-0.3	-7.9
13	XZD-Э ₁n-15T	灰岩	1966.10	-0.8	-11.2	81	XZD-Э ₂a-14T	灰岩	1492.25	0.3	-8.7
14	XZD-Э ₁n-16T	灰岩	1962.35	-11.0	-11.2	82	XZD-Э ₂a-15T	灰岩	1485.30	-0.5	-9.8
15	XZD-Э ₁n-17T	灰岩	1959.60	-10.3	-11.1	83	XZD-Э ₂a-16T	灰岩	1481.05	-0.5	-9.7
16	XZD-Э ₁n-18T	灰岩	1953.40	-10.0	-10.8	84	XZD-Э ₂a-17T	灰岩	1477.58	-1.0	-9.7
	XZD-Э ₁n-18T^*	灰岩	1953.40	-10.0	-10.9		XZD-Э ₂a-17T^*	灰岩	1477.58	-1.0	-9.7
17	XZD-Э ₁n-19T	灰岩	1945.75	-4.0	-10.4	85	XZD-Э ₂a-18T	灰岩	1467.35	-1.2	-10.5
18	XZD-Э ₁n-21T	灰岩	1916.53	-3.1	-11.1	86	XZD-Э ₂a-19T	灰岩	1461.10	-3.0	-9.8
19	XZD-Э ₁n-22T	灰岩	1909.30	-2.8	-10.8	87	XZD-Э ₂a-20T	灰岩	1456.55	-1.5	-9.8
20	XZD-Э ₁n-23T	灰岩	1905.00	-3.8	-10.3	88	XZD-Э ₂a-21T	灰岩	1450.90	-3.3	-9.6
21	XZD-Э ₁n-24T	灰岩	1892.62	-2.7	-11.3	89	XZD-Э ₂a-22T	灰岩	1440.85	-1.0	-9.8
22	XZD-P-6T	灰岩	1818.90	-3.8	-9.5	90	XZD-Э ₂a-23T	灰岩	1434.30	-2.3	-9.7
23	XZD-P-5T	灰岩	1805.70	-1.6	-11.1	91	XZD-Э ₂a-24T	灰岩	1427.15	-1.3	-9.6
24	XZD-P-4T	灰岩	1796.80	-5.5	-9.4	92	XZD-Э ₂a-25T	灰岩	1419.10	-1.3	-9.1
25	XZD-P-3T	灰岩	1792.10	-2.0	-11.5	93	XZD-Э ₂a-26T	灰岩	1415.45	1.3	-8.6
26	XZD-Э ₂q-1T	灰岩	1721.40	-1.4	-8.9		XZD-Э ₂a-26T^*	灰岩	1415.45	1.3	-8.5
27	XZD-Э ₂q-2T	灰岩	1719.80	-1.5	-8.7	94	XZD-Э ₂a-27T	灰岩	1411.25	-1.1	-8.9
28	XZD-Э ₂q-3T	灰岩	1715.90	-0.3	-9.2	95	XZD-Э ₂a-28T	灰岩	1405.60	-1.0	-9.8
29	XZD-Э ₂q-4T	灰岩	1712.50	0.7	-9.0	96	XZD-Э ₂a-29T	灰岩	1405.05	-1.0	-9.7
30	XZD-Э ₂q-5T	灰岩	1708.70	-0.4	-8.6	97	XZD-Э ₂a-30T	灰岩	1400.30	-0.8	-9.3
31	XZD-Э ₂q-6T	灰岩	1699.35	-0.1	-6.7	98	XZD-Э ₂a-31T	灰岩	1395.55	-0.5	-9.4
32	XZD-Э ₂q-7T	灰岩	1692.15	0.1	-9.0	99	XZD-Э ₂a-32T	灰岩	1390.95	-1.5	-9.0
33	XZD-Э ₂q-8T	灰岩	1688.90	1.0	-7.5	100	XZD-Э ₂a-33T	灰岩	1386.40	-0.5	-9.0
34	XZD-Э ₂q-9T	灰岩	1685.75	0.2	-8.9		XZD-Э ₂a-33T	灰岩	1386.40	-0.5	-9.0
	XZD-Э ₂q-9T^*	灰岩	1685.75	0.2	-8.8	101	XZD-Э ₂a-34T	灰岩	1381.05	-1.4	-8.7
35	XZD-Э ₂q-10T	灰岩	1682.05	1.2	-6.7	102	XZD-Э ₂a-35T	灰岩	1378.10	-2.0	-9.2
36	XZD-Э ₂q-11T	灰岩	1678.70	0.5	-8.2	103	XZD-Э ₂a-36T	灰岩	1372.65	-0.7	-8.5
37	XZD-Э ₂q-12T	灰岩	1675.30	1.6	-7.4	104	XZD-Э ₂a-37T	灰岩	1365.50	-0.1	-7.4
38	XZD-Э ₂q-13T	灰岩	1672.10	2.3	-7.3	105	XZD-Э ₂a-38T	灰岩	1357.40	0.4	-7.7
39	XZD-Э ₂q-14T	灰岩	1668.25	2.5	-7.2	106	XZD- Э₂a-39T	灰岩	1351.70	0.2	-7.7
40	XZD-Э ₂q-15T	灰岩	1665.10	2.6	-6.8		XZD-Э ₂a-39T^*	灰岩	1351.70	0.2	-7.6
41	XZD-Э ₂q-16T	灰岩	1662.80	2.7	-5.8	107	XZD-Э ₂a-40T	灰岩	1346.90	0.0	-7.6
	XZD-Э ₂q-16T^*	灰岩	1662.80	2.7	-5.7	108	XZD-Э ₂a-41T	灰岩	1339.20	1.0	-8.4
42	XZD-Э ₂q-17T	灰岩	1660.05	2.5	-6.4	109	XZD-Э ₂a-42T	灰岩	1333.30	1.3	-8.5
43	XZD-Э ₂q-18T	灰岩	1657.00	2.7	-5.8	110	XZD-Э ₂a-43T	灰岩	1326.80	1.8	-7.8
44	XZD-Э ₂q-19T	灰岩	1654.30	2.9	-6.0	111	XZD-Э ₂a-44T	灰岩	1322.20	1.4	-7.4
45	XZD-Э ₂q-20T	灰岩	1649.60	2.6	-6.0	112	XZD-Э ₂a-45T	灰岩	1314.60	1.9	-7.2
46	XZD-Э ₂q-21T	灰岩	1645.58	2.4	-6.2		XZD-Э ₂a-45T*	灰岩	1314.60	2.0	-7.2
47	XZD-Э ₂q-22T	灰岩	1641.20	2.3	-5.6	113	XZD-Э ₂a-46T	灰岩	1310.50	1.6	-8.8
48	XZD-Э ₂q-23T	灰岩	1636.30	2.1	-6.2	114	XZD-Э ₂a-47T	灰岩	1304.53	0.7	-9.8
49	XZD-Э ₂q-24T	灰岩	1630.45	1.8	-6.1	115	XZD-Э ₂a-48T	灰岩	1296.70	1.7	-8.4
	XZD-Э ₂q-24T^*	灰岩	1630.45	1.8	-6.1	116	XZD-Э ₂a-49T	灰岩	1289.80	2.0	-10.4
50	XZD-Э ₂q-25T	灰岩	1626.30	1.5	-6.4	117	XZD-Э ₂a-50T	白云岩	1282.70	1.6	-11.0
51	XZD-Э ₂q-26T	灰岩	1622.00	0.2	-7.5	118	XZD-Э ₂a-51T	白云岩	1275.40	0.5	-8.3
52	XZD-Э ₂q-27T	灰岩	1619.00	-0.7	-8.9		XZD-Э ₂a-51T^*	白云岩	1275.40	0.5	-8.2
53	XZD-Э ₂q-28T	灰岩	1613.20	-5.7	-8.6	119	XZD-Э ₂a-52T	白云岩	1269.10	-0.1	-8.2
54	XZD-Э ₂q-29T	灰岩	1608.80	-0.4	-9.9	120	XZD-Э ₂a-53T	白云岩	1262.30	0.1	-7.9
55	XZD-Э ₂q-30T	灰岩	1603.80	-0.3	-9.0	121	XZD-Э ₂a-54T	白云岩	1256.40	0.1	-6.3
56	XZD-Э ₂q-31T	灰岩	1600.43	0.0	-8.0	122	XZD-Э ₂a-55T	白云岩	1250.30	-0.1	-6.8
	XZD-Э ₂q-31T^*	灰岩	1600.43	0.0	-8.0	123	XZD-Э ₂a-56T	白云岩	1240.60	-0.9	-6.7
57	XZD-Э ₂q-32T	灰岩	1594.80	-0.1	-4.6	124	XZD-Э ₂a-57T	灰岩	1238.70	-0.6	-6.5
58	XZD-Э ₂q-33T	灰岩	1590.70	-0.3	-6.5	125	XZD-Э ₂a-58T	灰岩	1232.40	-1.3	-6.3
59	XZD-Э ₂q-34T	灰岩	1587.45	0.0	-8.4	126	XZD-Э ₂a-59T	灰岩	1227.55	-1.9	-6.1
60	XZD-Э ₂q-35T	灰岩	1582.45	0.5	-7.2	127	XZD-Э ₂a-60T	灰岩	1225.25	-2.2	-5.6
61	XZD-Э ₂q-36T	灰岩	1579.60	2.1	-8.2	128	XZD-Э ₂a-61T	灰岩	1219.40	-1.9	-6.0
62	XZD-Э ₂q-37T	泥晶白云岩	1575.00	1.7	-6.8		XZD-Э ₂a-61T^*	灰岩	1219.40	-1.9	-6.1
	XZD-Э ₂q-37T^*	泥晶白云岩	1575.00	1.7	-6.9	129	XZD-Э ₂a-62T	灰岩	1209.20	-1.9	-6.3
63	XZD-Э ₂q-38T	泥晶白云岩	1572.00	1.5	-7.3	130	XZD-Э ₂a-63T	灰岩	1201.20	-1.2	-6.0
64	XZD-Э ₂q-39T	泥晶白云岩	1565.60	1.3	-5.3	131	XZD-Э ₂a-64T	灰岩	1195.40	-0.8	-6.0
65	XZD-Э ₂q-40T	泥晶白云岩	1560.95	1.1	-5.3	132	XZD-Э ₂a-65T	灰岩	1192.20	-0.8	-5.9
66	XZD-Э ₂q-41T	泥晶白云岩	1554.60	0.7	-4.9	133	XZD-Э ₂a-66T	灰岩	1184.55	-0.6	-11.2
67	XZD-Э ₂q-42T	泥晶白云岩	1553.30	0.8	-7.9	注: ^*为质量监控样品,共17件

图 5 湖南张家界地区湘张地1井寒武系 δ¹³C _PDB和

δ 18 O P D B

变化特征

Fig.5 δ¹³C _PDB and

δ 18 O P D B

variation of the Cambrian from Well Xiangzhangdi-1 in Zhangjiajie area,Hunan Province

图 5 湖南张家界地区湘张地1井寒武系 δ¹³C _PDB和

δ 18 O P D B

变化特征

Fig.5 δ¹³C _PDB and

δ 18 O P D B

variation of the Cambrian from Well Xiangzhangdi-1 in Zhangjiajie area,Hunan Province

图 6 湖南张家界地区湘张地1井寒武纪早期碳同位素组成演化趋势及地层对比

Fig.6 Evolutionary trend of the Early Cambrian carbon isotopic composition and stratigraphic correlation diagram of Well Xiangzhangdi-1 in Zhangjiajie area,Hunan Province

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湘西北寒武纪早期碳同位素异常事件识别:基于湘张地1井地层对比与古环境响应^*

Identification of carbon isotope anomaly events in the Early Cambrian of northwestern Hunan Province: based on stratigraphic correlation and paleoenvironmental response from Well Xiangzhangdi-1

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湘西北寒武纪早期碳同位素异常事件识别:基于湘张地1井地层对比与古环境响应*

Identification of carbon isotope anomaly events in the Early Cambrian of northwestern Hunan Province: based on stratigraphic correlation and paleoenvironmental response from Well Xiangzhangdi-1

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湘西北寒武纪早期碳同位素异常事件识别:基于湘张地1井地层对比与古环境响应^*