| 西秦岭地区晚二叠世—早三叠世沉积相分析和沉积古环境再造 |
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| 引用本文： | 罗根明,张克信,林启祥,寇晓虎,朱云海,徐亚东,施彬.西秦岭地区晚二叠世—早三叠世沉积相分析和沉积古环境再造[J].沉积学报,2007,25(3):332-342. |
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| 作者姓名： | 罗根明 张克信 林启祥 寇晓虎 朱云海 徐亚东 施彬 |
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| 作者单位： | 中国地质大学地球科学学院 武汉 430074 |
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| 基金项目： | 全国高等学校优秀博士学位论文作者专项基金
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教育部长江学者和创新团队发展计划
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中国地质调查局区域地质调查项目 |
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| 摘 要： | 青海省同仁地区处于祁连和秦岭造山带的接合部，构造演化历史悠久。本次工作在该地区隆务河一带发现较好的二叠—三叠系剖面。将该剖面从下而上划分为上二叠统石关组、下三叠统果木沟组和江里沟组，其中江里沟组又进一步划分为下部的浊积岩段和上部的风暴岩段，初步确定了二叠—三叠纪的界线。沉积序列、沉积相和沉积物表明上二叠统石关组和下三叠统果木沟组为一套陆源碎屑浊积岩，下三叠统江里沟组下部为一套不纯的内碎屑浊积岩，而下三叠统江里沟组上部为风暴岩沉积。根据沉积相和火山岩夹层的地球化学特征认为该地区上二叠统石关组和下三叠统果木沟组处于半深海的活动大陆边缘，下三叠统江里沟组早期的浊积岩段处于较稳定的半深海大陆边缘。根据沉积相和遗迹化石，恢复了晚二叠世—早三叠世的海平面变化特征。
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| 关 键 词： | 沉积相 沉积环境 西秦岭 晚二叠世 早三叠世 |
| 文章编号： | 1000-0550（2007）03-0332-11 |
| 收稿时间： | 2006-06-30 |
| 修稿时间： | 2006-06-302006-11-20 |
Sedimentary Facies Analysis and Sedimentary Environment Reconstruction from Late Permian to Early Triassic of West Qinling Area |
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| LUO Gen-ming,ZHANG Ke-Xin,LIN Qin-Xiang,KOU Xiao-hu,ZHU Yun-hai,XU Ya-dong,SHI Bin.Sedimentary Facies Analysis and Sedimentary Environment Reconstruction from Late Permian to Early Triassic of West Qinling Area[J].Acta Sedimentologica Sinica,2007,25(3):332-342. |
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| Authors: | LUO Gen-ming ZHANG Ke-Xin LIN Qin-Xiang KOU Xiao-hu ZHU Yun-hai XU Ya-dong SHI Bin |
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| Institution: | Faculty of Earth Sciences, China University of Geosciences,Wuhan 430074 |
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| Abstract: | Tongren area of Qinghai province is located on the copulae of Qilian and Qinling orogene,of which the structure evolution history is very famous.A continuous Permian-Triassic stratum was found in Longwuhe area during this work.In ascending order,this section is divided into Shiguan Formation of upper Permian,Guomugou Formation and Jiangligou Formation of lower Triassic,while Jiangligou Formation is divided into turbidite Member at the lower and tempestite Member at the upper.Primary Permian-Triassic Boundary is definited in this work.Sedimentary sequence,sedimentary facies and sediments indicate the Shiguan Formation of upper Permian and Guomugou Formation of lower Triassic are terrigenous clastic turbidite,while the lower parts of Jiangligou Formation of lower Triassic is intraclast turbidite and upper is tempestite.According to the sedimentary facies and geochemistry of interlayer igneous rock,the Shiguan Formation and Guomugou Formation were located at active hemi-pelagic continental margin,while the Turbidite Member of Jiangligou Formation was located at steady hemi-pelagic continental margin.The sea level turns down and the sedimentary environment transited into neritic shelf during the tempestite Member of Jiangligou Formation.Based on the sedimentary facies characteristic,this paper reconstructed the eustatic changes during Late Permian and Early Triassic. |
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| Keywords: | sedimentary facies sedimentary environment west Qinling Late Permian Early Triassic |
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