| 栖霞组和茅口组等厚图:对峨眉山地幔柱成因模式的指示意义 |
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| 引用本文： | 李宏博,张招崇,吕林素,汪云峰,寇彩化,李永生,廖宝丽.栖霞组和茅口组等厚图:对峨眉山地幔柱成因模式的指示意义[J].岩石学报,2011,27(10):2963-2974. |
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| 作者姓名： | 李宏博 张招崇 吕林素 汪云峰 寇彩化 李永生 廖宝丽 |
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| 作者单位： | 1. 中国地质大学地质过程与矿产资源国家重点实验室,北京100083;中国地质博物馆,北京100034
2. 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083 |
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| 基金项目： | 本文受973项目(2009CB421002)、国家自然科学基金(40925006)、教育部博士点基金(20090022110006)和111计划(B07011)联合资助. |
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| 摘 要： | 对峨眉山大火成岩省(ELIP)及周边地区的栖霞组和茅口组地层进行厚度统计,并利用Surfer软件分别绘制等厚图.栖霞组和茅口组等厚图表明,峨眉山地幔柱导致的隆升可能在栖霞期已开始.茅口组顶部普遍存在平行不整合界面,说明广大区域内的茅口组地层均曾抬升为陆并遭受剥蚀,与CampbeU和Griffiths提出的经典地幔柱模型相吻合.永仁-大姚-楚雄-石屏以及宜良-曲靖一带存在二叠系地层缺失区域,可能是地壳隆升幅度最大地区.利用实验模型推导出ELIP的最大隆升幅度为1500m,与前人利用沉积学推算的结果基本一致.茅口组差异剥蚀指示的地幔柱中心地区与放射状基性岩墙群收敛中心吻合.隆起幅度最大的中心区域存在海相玄武岩喷发现象则可能是隆升之后快速沉降造成的,并不能作为否定曾经发生隆起的证据.
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| 关 键 词： | 栖霞组 茅口组 等厚图 峨眉山大火成岩省 地幔柱 |
| 收稿时间： | 5/1/2011 12:00:00 AM |
| 修稿时间： | 7/4/2011 12:00:00 AM |
Isopach maps of the Qixia and Maokou formations:Implication for mantle plume model of the Emeishan large igneous province |
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| LI HongBo,ZHANG ZhaoChong,LV LinSu,WANG YunFeng,KOU CaiHu,LI YongSheng and LIAO BaoLi.Isopach maps of the Qixia and Maokou formations:Implication for mantle plume model of the Emeishan large igneous province[J].Acta Petrologica Sinica,2011,27(10):2963-2974. |
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| Authors: | LI HongBo ZHANG ZhaoChong LV LinSu WANG YunFeng KOU CaiHu LI YongSheng and LIAO BaoLi |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;Geological Museum of China, Beijing 100034, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;Geological Museum of China, Beijing 100034, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The thicknesses of Qixia and Maokou formations in the Emeishan Large Igneous Province(ELIP) and peripheral areas were collected and isopach maps were made by Surfer respectively.The isopach maps indicate that uplift caused by Emeishan mantle plume has started in Qixianian.Disconformities were distributed broadly on the top of Maokou Formation,which demonstrate that Maokou Formation has been uplifted over the sea level and denudated differentially.This has been predicated in Campbell and Griffiths's classic ... |
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| Keywords: | Qixia Formation Maokou Formation Isopach map Emeishan large igneous province Mantle plume |
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