峨眉山地幔柱沉积-构造演化及沉积响应  

The sedimentary-tectonic evolution and sedimentary response of mantle plume in Emeishan

作　　者：王瑞华[1] 谭钦银[1] 付建元[2] 牟传龙[1] 程锦翔[1] 王正和[1] 

机构地区：[1]成都地质矿产研究所,四川成都610082 [2]川庆钻探工程有限公司地球物理勘探公司,四川成都610213

出　　处：《地学前缘》2011年第3期201-210,共10页Earth Science Frontiers

基　　金：中国地质调查局项目"中上扬子重点地区沉积与油气地质条件研究"(1212011120969)

摘　　要：中、晚二叠世上扬子区发生了一次规模巨大的峨眉山地幔柱事件,该事件的火山产物为峨眉山玄武岩。峨眉山地幔柱事件的沉积与构造演化、火山活动过程中的沉积特征及沉积响应等研究表明,峨眉山地幔柱经历了岩浆深部活动、火山穹窿形成、火山喷发及地壳下沉等多个阶段。地幔柱除造成火山喷发外,还引发了很多与之相关的重要事件,如火山穹窿形成、地震、海啸及热液活动等,造成的沉积响应有沉积物同生滑动、热液沉积及风暴沉积等。其中,茅口组疙瘩状团块灰岩及其相关特征是沉积物同生滑动的结果,茅口组—长兴组中的燧石是岩浆分异的热液沉积,茅口组地层中的泥质及其中粗碎屑为风暴沉积。茅口组及吴家坪组杂乱沉积与地震活动有关,或许可以称之为"震积岩"。In the Middle-Late Permian,a large scale of mantle plume event in Emeishan took place in the Upper-Yangtze region and the volcanic product of the event was Emeishan Basalt.The sedimentary-tectonic evolution of mantle plume in Emeishan,and sedimentary characteristics and sedimentary responses of volcanic activity were studied.Mantle plume in Emeishan is considered to have undergone the stages of deep magmatic activity,volcanic dome,volcanic eruption,crustal subsidence,etc.Mantle plume also caused other correlative important events such as volcanic dome,earthquake,tsunami and hydrothermal activity,and its sedimentary responses included syngenetic deposit sliding,hydrothermal deposit and storm deposit.Therefore,the lump limestones of Maokou Formation and their characteristics are the results of syngenetic deposit sliding,the flints of Maokou Formation-Changxing Formation are hydrothermal deposits of magmatic differentiation,and the mud and megaclast in the Maokou Formation is the result of storm deposit.Disorderly deposits of Maokou Formation and Wujiaping Formation are related to earthquake activities,which may be called seismite.

关 键 词：峨眉山地幔柱 玄武岩 火山活动 沉积响应 

分 类 号：P542.5[天文地球—构造地质学]