赣西南地区寒武纪沉积构造环境分析  

An analysis of Cambrian sedimentary-tectonic environment in southwestern Jiangxi Province

作　　者：郑宁[1] 李廷栋[1] 耿树方[1] 宋志瑞[2] 阎丽艳[3] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]江西省地质调查研究院,江西南昌330000 [3]中国石化胜利油田物探研究院,山东东营257022

出　　处：《中国地质》2011年第6期1454-1466,共13页Geology in China

基　　金：中国地质调查局"西太平洋大陆边缘深部过程与成矿作用"项目(1212010733802)资助

摘　　要：赣西南地区寒武系为一套砂泥质复理石沉积,关于其沉积构造环境的认识争议颇多,笔者以沉积地质学和岩相古地理学理论为基础,将野外调查与室内研究相结合,从地层格架、砂岩基本特征、岩相分析着手,来恢复该时期沉积构造环境。研究表明,该套复理石属快速堆积的半深海海底扇相,物源自研究区南东方向的华夏陆块而来,随后连续沉积于华夏陆块北缘的陆隆区;寒武纪海水自南东向北西逐渐加深,早寒武世初期海平面上升,而后逐渐下降。Cambrian strata of southwestern Jiangxi are composed of a set of sandy and muddy flysch sediments.Controversies have long existed as to the sedimentary-tectonic environment of these strata.Based on the theories of sedimentary geology and lithofacies-paleogeography,the authors combined field investigation with indoor laboratory analysis and recovered the sedimentary-tectonic environment through the analysis of stratigraphic framework,basic characteristics of sandstone and lithofacies.It is supposed that this set of flysch is hemipelagic submarine fan facies rock accumulated rapidly in southwestern Jiangxi Province.The provenance of the submarine fan was derived from Cathaysia Block in southeast Jiangxi and then deposited continually in the continental rise on the northern edge of Cathaysia Block.The sea water got deeper gradually from SE to NW in Cambrian period.The sea level rose at the early stage of the lower Cambrian period and then gradually got lowered.

关 键 词：赣西南 寒武系 岩相 陆隆 海底扇 

分 类 号：P534.41[天文地球—古生物学与地层学] P512.2[天文地球—地质学]