Sedimentary environment of the Lower Cambrian Mufushan Formation in the Lower Yangtze region: Evidence from whole-rock geochemistry

XU Ming; CHEN Jianwen; YUAN Yong; ZHANG Yinguo; LIANG Jie; LI Huijun; WANG Jianqiang; WU Shuyu

doi:10.16562/j.cnki.0256-1492.2020101601

2021 Vol. 41, No. 6

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Article navigation > Marine Geology & Quaternary Geology > 2021 > 41(6): 82-90

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XU Ming, CHEN Jianwen, YUAN Yong, ZHANG Yinguo, LIANG Jie, LI Huijun, WANG Jianqiang, WU Shuyu. Sedimentary environment of the Lower Cambrian Mufushan Formation in the Lower Yangtze region: Evidence from whole-rock geochemistry[J]. Marine Geology & Quaternary Geology, 2021, 41(6): 82-90. doi: 10.16562/j.cnki.0256-1492.2020101601

Citation:

XU Ming, CHEN Jianwen, YUAN Yong, ZHANG Yinguo, LIANG Jie, LI Huijun, WANG Jianqiang, WU Shuyu. Sedimentary environment of the Lower Cambrian Mufushan Formation in the Lower Yangtze region: Evidence from whole-rock geochemistry[J]. Marine Geology & Quaternary Geology, 2021, 41(6): 82-90. doi: 10.16562/j.cnki.0256-1492.2020101601

Sedimentary environment of the Lower Cambrian Mufushan Formation in the Lower Yangtze region: Evidence from whole-rock geochemistry

1.
Jiangsu College of Engineering and Technology, Nantong 226007, China
2.
Qingdao Institute of Marine Geology, China Geological Survey, Ministry of Natural Resources, Qingdao 266237, China
3.
Laboratory for Marine Mineral Resources, Qingdao National Pilot Laboratory for Marine Science and Technology, Qingdao 266237, China
4.
Shandong University of Science and Technology, Qingdao 266590, China
5.
Hohai University, Nanjing 210098, China

More Information

Corresponding author: CHEN Jianwen, jwchen2012@126.com

Received Date: 16 October 2020

Revised Date: 10 August 2021

Publish Date: 28 December 2021

Abstract

Abstract

The Mufushan Formation of Lower Cambrian is the most significant hydrocarbon source rock for shale gas in the Yangtze Platform. No exploration breakthrough has been achieved so far in the Lower Yangtze area, compared to the Middle and Upper Yangtze areas. Recently, the well of GD-1 has been completed, for which the Early Cambrian Mufushan (MFS) Formation is completelyly cored. Geochemistry of calcareous/carbonaceous mudstone of Early Cambrian Mufushan (MFS) Formation are carefully investigated for paleo-environment, provenance and tectonic settings. The samples of MFS are characterized by enriched large ion lithophile elements and depleted high field strength elements and transition elements. The analysis results show that the total REE concentrations of MFS mudstones vary from 14.81 to 107.47 ug/g. The Chemical Index of Alteration (CIA) ranges from 64.84 to 78.81. And the A-CN-K plot indicate that the source rocks has undergone a moderate weathering. In the Th/Sc versus Zr/Sc plot, most samples are located in the area between basalt and felsic igneous rocks, with negligible sedimentary recycling. Both the Al₂O₃/TiO₂ ratios and TiO₂/Zr ratios indicate an intermediate-felsic igneous provenance. The Cr/V ratios and La/Th-Hf diagrams also suggest that most of the materials are derived from intermediate-felsic rocks.
- sedimentary enviroment /
- element geochemistry /
- Mufushan Formation /
- Lower Yangtze /
- Early Cambrian

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References

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