北祁连石灰沟奥陶纪碳酸盐岩—硅质岩形成的构造环境

闫臻; 李继亮; 雍拥; 肖文交; 王宗起; 向永生

北祁连石灰沟奥陶纪碳酸盐岩—硅质岩形成的构造环境

- 1.
  中国地质科学院地质研究所, 北京 100037
- 2.
  中国科学院地质与地球物理研究所, 北京 100029
- 3.
  中金黄金股份有限公司, 北京 100013
基金项目:
中国地质科学院地质研究所所长基金(J0709)、国家重点基础研究发展规划项目(2007CB411307)和国家自然科学基金委项目(40334044, 40772137,40725009)联合资助

刊出日期: 2008-10-31

Tectonic environment of Ordovician carbonate-cherts in the Shihuigou area, North Qilian orogen

- 1.
  Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
- 2.
  Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
- 3.
  Zhongjin Gold Company Limited, Beijjing 100013, China

Publish Date: 31 October 2008

摘要

摘要: 北祁连造山带石灰沟奥陶纪硅质岩与碱性玄武岩、熔结凝灰岩、火山碎屑岩、泥岩、杂砂岩、砂屑灰岩、生物碎屑灰岩及生物礁共同构成了一个相对完整的海山组合序列。其中硅质岩中含有早—中奥陶世牙行刺化石,泥岩和砂岩中含有中—晚奥陶世三叶虫和笔石化石。硅质岩地球化学特征研究表明其源区为其形成提供了丰富的碎屑物质来源,从而表现为LREE富集,Eu*CN负异常特征; 这些硅质岩形成于陆缘环境,并非深海或洋中脊环境。
- 北祁连造山带 /
- 石灰沟 /
- 海山/洋岛 /
- 硅质岩
Abstract: Ordovician cherts, mudstone, greywacke, calcarenite, bioclastic limestone, reef limestone and alkaline basalts, ignimbrite, pyroclastic rocks represent the lithological associations of a seamount/oceanic island in the Shihuigou, North Qilian orogenic belt. The cherts contain abundant early-middle Ordovician conodonts, and mudstone and sandstone contain middle-late Ordovician Trilobita and graptolite fossils. Geochemical analysis of these chert samples indicates that they contain some detrital components from source area with distinctive character of LREE enrichment and negative Eu*CNanomalous; they deposited in the continental margin rather than in the open sea or near the spreading ridge setting.
- North Qilian orogenic belt /
- Shihuigou /
- Seamount/oceanic island /
- Chert

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北祁连石灰沟奥陶纪碳酸盐岩—硅质岩形成的构造环境

Tectonic environment of Ordovician carbonate-cherts in the Shihuigou area, North Qilian orogen

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