Mixed sedimentation of the Middle Devonian Jinbaoshi Formation in Longmen Mountain area,Sichuan Province

doi:10.7605/gdlxb.2023.02.033

JOPC ›› 2023, Vol. 25 ›› Issue (2): 294-307. doi: 10.7605/gdlxb.2023.02.033

• LITHOFACIES PALAEOGEOGRAPHY AND SEDIMENTOLOGY • Previous Articles Next Articles

Mixed sedimentation of the Middle Devonian Jinbaoshi Formation in Longmen Mountain area,Sichuan Province

LI Fengjie^1,2, WANG Jia³, MA Xiaokang², LAI Xuelian², ZHANG Pengfei², REN Xuying², CHEN Zheng'an²

1 State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan Chengdu 610059, China;
2 Institute of Sedimentary Geology, Chengdu University of Technology & Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications, MNR,Sichuan Chengdu 610059, China;
3 College of Earth Science, Chengdu University of Technology, Sichuan Chengdu 610059, China

Received:2022-02-11 Revised:2022-10-31 Online:2023-04-01 Published:2023-04-14
About author:LI Fengjie,born in 1972,is a professor in the State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation of Chengdu University of Technology,with a Ph.D. degree obtained from Lanzhou Institute of Geology,Chinese Academy of Sciences. He is mainly engaged in researches on sedimentology and stratigraphy. E-mail: lifengjie72@163.com.
Supported by:
National Natural Science Foundation of China(No.41172100)and the First-class Provincial Subjects in Earth Sciences-Sedimentology,Chengdu University of technology(No.21700-000517)

四川龙门山地区中泥盆统金宝石组混合沉积特征^*

李凤杰^1,2, 王佳³, 马小康², 赖雪莲², 张鹏飞², 任栩莹², 陈政安²

1 油气藏地质及开发工程国家重点实验室(成都理工大学),四川成都 610059;
2 成都理工大学沉积地质研究院/自然资源部深时地理环境重建与应用重点实验室,四川成都 610059;
3 成都理工大学地球科学学院,四川成都 610059

作者简介:李凤杰,男,1972年生,毕业于西安地质学院,在中国科学院兰州地质研究所获得博士学位。现为成都理工大学沉积地质研究院教授、博士生导师,主要从事沉积学的教学和科研工作。E-mail: lifengjie72@163.com。
基金资助:
*国家自然科学基金项目(编号: 41172100)、成都理工大学地球科学省级一流学科—沉积(编号: 21700-000517)联合资助

Abstract

Abstract: The Devonian of Longmen Mountain area is an important and highly studied area. The Middle Devonian Jinbaoshi Formation is composed of clastic rocks,carbonate rocks and mixed rocks. In this paper,the sedimentary facies of the Jinbaoshi Formation were studied in detail based on thin section observation and the measured data of the Pingyipu section in Pingwu County and Ganxi section in Beichuan County. The results show that the Middle Devonian Jinbaoshi Formation in Longmen Mountain area has four sedimentary facies,namely fluvial,clastic shore,shelf and carbonate ramp. The sedimentary evolution experienced two cycles. The mixed sedimentation of Jinbaoshi Formation was produced by facies mixing and in situ mixing. The change of relative sea level,terrigenous clastic supply,carbonate production rate and paleoclimate are the main controlling factors for the mixed deposition of facies mixing,while wave and storm waves are the main mechanisms for the mixed deposition of terrigenous clastic and carbonate components. The study on the sedimentary sequence,sedimentary characteristics and sedimentary evolution of the Jinbaoshi Formation is helpful to improve the understanding of the sedimentary paleoenvironment of the Devonian in Longmen Mountain area,Sichuan Basin.

Key words: mixed sedimentation, sedimentary evolution, reef, Jinbaoshi Formation

摘要： 四川龙门山地区是中国泥盆系出露较好、研究程度较高的地区。中泥盆统金宝石组发育由碎屑岩、碳酸盐岩、混积岩组成的混积沉积。本研究以平武县平驿铺剖面和北川县甘溪剖面为切入点,基于实测资料和薄片观察对金宝石组沉积相开展详细研究,认为龙门山地区中泥盆统金宝石组发育河流、碎屑滨岸、陆棚和碳酸盐岩缓坡4种沉积相,沉积演化经历了2个沉积旋回。金宝石组以相混合和原地混合2种方式形成混合沉积。相对海平面的变化、陆源碎屑的供应、碳酸盐生产速率和古气候是引起相混合的主要控制因素,波浪和风暴浪则是引起陆源碎屑和碳酸盐组分混合沉积的主要作用方式。对金宝石组沉积序列、沉积特征及沉积演化过程的研究,有利于增进对龙门山地区泥盆系沉积古环境的认识。

关键词: 混合沉积, 沉积演化, 生物礁, 金宝石组

CLC Number:

P512.2

LI Fengjie, WANG Jia, MA Xiaokang, LAI Xuelian, ZHANG Pengfei, REN Xuying, CHEN Zheng'an. Mixed sedimentation of the Middle Devonian Jinbaoshi Formation in Longmen Mountain area,Sichuan Province[J]. JOPC, 2023, 25(2): 294-307.

李凤杰, 王佳, 马小康, 赖雪莲, 张鹏飞, 任栩莹, 陈政安. 四川龙门山地区中泥盆统金宝石组混合沉积特征^*[J]. 古地理学报, 2023, 25(2): 294-307.

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Mixed sedimentation of the Middle Devonian Jinbaoshi Formation in Longmen Mountain area,Sichuan Province

四川龙门山地区中泥盆统金宝石组混合沉积特征^*

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[14]	Meng Miao-Miao, Fan Tai-Liang, Wei Duan, Wang Shan-Shan. Sedimentary characteristics and reef-forming models of the Ordovician reefs in Lianglitage area,Tarim Basin [J]. JOPC, 2018, 20(2): 175-190.
[15]	Cheng Xiao-Yu, Li Feng-Jie, Jing Xi-Gui, Shen Fan, Zhang Hao. Petrologic characteristics and genesis analysis of oncoids from the Middle Devonian Jinbaoshi Formation in Longmenshan area,Sichuan Province [J]. JOPC, 2018, 20(2): 207-218.

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Mixed sedimentation of the Middle Devonian Jinbaoshi Formation in Longmen Mountain area,Sichuan Province

四川龙门山地区中泥盆统金宝石组混合沉积特征*

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四川龙门山地区中泥盆统金宝石组混合沉积特征^*