中二叠统茅口组热液交代硅质岩成因——来自贵州桑树湾剖面角砾状硅质岩元素及硅同位素的证据

doi:10.7623/syxb202004007

石油学报 ›› 2020, Vol. 41 ›› Issue (4): 446-456.DOI: 10.7623/syxb202004007

中二叠统茅口组热液交代硅质岩成因——来自贵州桑树湾剖面角砾状硅质岩元素及硅同位素的证据

许涛¹, 韦恒叶^1,2, 张璇¹, 耿梓傲¹, 汪建国³

1. 东华理工大学地球科学学院江西南昌 330013;
2. 西南石油大学地球科学与技术学院四川成都 610500;
3. 中国石油学会北京 100724

收稿日期:2018-10-17 修回日期:2019-09-06 出版日期:2020-04-25 发布日期:2020-05-09
通讯作者: 韦恒叶,男,1980年12月生,2005年获大庆石油学院学士学位,2011年获中国科学院地质及地球物理研究所博士学位,现为西南石油大学副教授,主要从事沉积地球化学研究工作。Email:weihengye@163.com
作者简介:许涛,男,1994年10月生,2018年获南华大学学士学位,现为东华理工大学硕士研究生,主要从事沉积地球化学研究。Email:496573010@qq.com
基金资助:
国家自然科学基金项目（No.41762003）资助。

Genesis of hydrothermal replaced cherts in the Middle Permian Maokou Formation: evidences from elements and silicon isotopes of brecciated cherts in Sangshuwan section,Guizhou province

Xu Tao¹, Wei Hengye^1,2, Zhang Xuan¹, Geng Zi'ao¹, Wang Jianguo³

1. School of Earth Sciences, East China University of Technology, Jiangxi Nanchang 330013, China;
2. School of Geoscience and Technology, Southwest Petroleum University, Sichuan Chengdu 610500, China;
3. Chinese Petroleum Society, Beijing 100724, China

Received:2018-10-17 Revised:2019-09-06 Online:2020-04-25 Published:2020-05-09

摘要/Abstract

摘要：

华南地区贵州省茅口组上部发育一套灰白色角砾状硅质岩，其特征与华南地区孤峰组的黑色层状硅质岩明显不同，这套特殊的角砾状硅质岩的成因尚不清楚。选择贵州省仁怀市桑树湾剖面中二叠统茅口组角砾状硅质岩作为研究对象，对其进行岩相、主量、微量和稀土元素以及硅同位素组成分析。研究结果表明，角砾状硅质岩形成于大陆边缘环境；茅口组角砾状硅质岩的形成主要与热液活动密切相关，是由热液交代碳酸盐岩形成的；热液受峨眉山地幔柱的活动的影响，从海底喷出后，对其上的碳酸盐岩沉积物破坏为角砾状，并对其自上而下进行硅化交代，从而形成热液交代成因角砾状硅质岩。

关键词: 角砾状硅质岩, 茅口组, 热液交代, 峨眉山地幔柱, 元素地球化学, 硅同位素

Abstract:

A set of gray-white brecciated cherts were developed in the upper part of the Maokou Formation in Guizhou, South China, whose characteristics are significantly different from those of the black bedded cherts from the Gufeng Formation in South China. However, the genesis of this special cherts is still unknown. Taking the Permian Maokou Formation brecciated cherts from the Sangshuwan section of Renhuai City in Guizhou as the research object, this paper analyzes its lithofacies, major and minor elements, rare earth elements, and composition of silicon isotopes. The research results show that the brecciated cherts were formed in the continental marginal environment. The formation of the brecciated cherts in the Maokou Formation is closely related to hydrothermal activity, and is formed by hydrothermal replacement of carbonate rocks. Impacted by the Emeishan mantle plume activity, hydrothermal fluids from the ocean floor broke the carbonate deposits above into brecciated rocks. The carbonate deposits were silicified from top to bottom to form brecciated cherts through hydrothermal replacement.

Key words: brecciated cherts, Maokou Formation, hydrothermal replacement, Emeishan mantle plume, element geochemistry, silicon isotope

中图分类号:

TE122.2

许涛, 韦恒叶, 张璇, 耿梓傲, 汪建国. 中二叠统茅口组热液交代硅质岩成因——来自贵州桑树湾剖面角砾状硅质岩元素及硅同位素的证据[J]. 石油学报, 2020, 41(4): 446-456.

Xu Tao, Wei Hengye, Zhang Xuan, Geng Zi'ao, Wang Jianguo. Genesis of hydrothermal replaced cherts in the Middle Permian Maokou Formation: evidences from elements and silicon isotopes of brecciated cherts in Sangshuwan section,Guizhou province[J]. Acta Petrolei Sinica, 2020, 41(4): 446-456.

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中二叠统茅口组热液交代硅质岩成因——来自贵州桑树湾剖面角砾状硅质岩元素及硅同位素的证据

Genesis of hydrothermal replaced cherts in the Middle Permian Maokou Formation: evidences from elements and silicon isotopes of brecciated cherts in Sangshuwan section,Guizhou province

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