山西沁水盆地西缘寒武系碳酸盐岩的元素地球化学特征及其古环境意义<sup>*</sup>

doi:10.7605/gdlxb.2020.02.087

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Abstract A set of significant Cambrian carbonate rocks are found in Qinshui Basin of Shanxi Province. On the basis of field investigation,the petrology and element geochemical composition of Cambrian rocks in the western margin of Qinshui Basin are studied. The results show that the Cambrian carbonate rocks are mainly composed of limestone from the Zhangxia and Gushan Formations, and dolostone from the lower part of Sanshanzi Formation. They are mainly shallow platform facies deposits which can be divided into three types: Restricted platform,open platform and platform margin reef and ramp. There are large variation ranges for the authigenic elements(CaO,MgO)and terrestrial elements(SiO₂,Al₂O₃ and Fe₂O₃). They have two vertical upward and downward cycles,reflecting the sedimentary environment with high turbulence. The content of K₂O is high,but the contents of Na₂O and Sr are relatively low. The contents of ΣREE+Y are relatively high and vary widely,and the LREE are much richer than the HREE. A slight negative anomaly of Ce and Eu is found. The normalized curves show a slightly leftward-flat trend,which conforms to the characteristics of the typical marine sediments. The δ¹³C value is in the range of -1.96‰~0.41‰,showing an overall change of initial increase and then decrease trend. The δ¹⁸O value ranges from -9.96‰~-5.33‰,showing a ladder-like upward trend from bottom to top. Related geochemical parameters indicate that the study area was a saltwater marine environment. The paleo-seawater temperature belonged to a warm subtropical climate environment,generally changing from warm to hot and then to cold trends. The paleoclimate experienced a transition of relative humidity-relative dry and heat environmen-relative humidity. The paleo-water depth underwent a variation of shallow-deep-shallow. The ancient sea level experienced a large-scale transgression-regression process. A good coupling relationship between different palaeoenvironment elements is found,showing a certain restriction on the types of sedimentary facies. The results in this paper are very significant for the studies of Cambrian lithofacies palaeogeography and petroleum exploration in the Qinshui Basin and the adjacent regions. It provides a significant theory and practical guidance in the reconstruction of Cambrian palaeoenvironment,palaeotology and palaeoecology evolution of the North China Craton.

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	Guo Xiao-Qiang
	Li Hao-Bin
	Wei Rong-Zhu
	Dong Ai-Guan
	Du Yan-Wei
	Yang Jun-Cai

Key words： element geochemistry palaeoenvironment carbonate rocks Cambrian Qinshui Basin

Received: 26 August 2019

ZTFLH:

P595

Fund:Financially supported by Geological Exploration Project(No. 21)of Shanxi Provincial Land and Resources Department in 2014

Corresponding Authors: Li Hao-Bin,born in 1966,is a Ph.D. and senior engineer. He is mainly engaged in sedimentology and tectonic geology. E-mail: 13903543063@163.com.

About author: Guo Xiao-Qiang,born in 1995,is a candidate for master’s degree. He is mainly engaged in sedimentology and tectonic geology. E-mail: 978840166@qq.com.

Cite this article:

Guo Xiao-Qiang,Li Hao-Bin,Wei Rong-Zhu et al. Characteristics of elemental geochemistry of the Cambrian carbonate rocks and their palaeoenvironmental implication in western margin of Qinshui Basin, Shanxi Province[J]. JOPC, 2020, 22(2): 349-366.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2020.02.087 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2020/V22/I2/349

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