贵州东部中上寒武统层序地层学及台地演化  

Platform Evolution and Sequence Stratigraphy of the Middle and Upper Cambrian in the East of Guizhou Province

作　　者：王贤[1] 张秀莲[1] 孙宇[2] 林勋[2] 覃天[2] 曲伟[2] 

机构地区：[1]北京大学地质系,北京100871 [2]新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《高校地质学报》2003年第3期440-449,共10页Geological Journal of China Universities

基　　金：国家自然科学基金(No.40172046)

摘　　要：通过对贵州东部丹寨—三都中上寒武统两个碳酸盐岩露头剖面的层序地层学研究,识别出3个(三级)层序及8个体系域,并认为由于构造升降运动,两露头剖面的沉积环境发生变化,该区台地类型由中寒武统的缓坡型陆棚演变成上寒武统的镶嵌陆架型台地。研究表明,自中元古宙晚期以来,研究区经历了由洋壳过渡到陆壳的演变过程,体现在该区自中寒武世至晚寒武世由广阔的坡缓底平的广海陆棚沉积,转为台地(斜坡)—广海(盆地)沉积环境。Three 3rd-order sequences and eight system tracts are recognized in two outcrop sections of the Midlle and Upper Cambrian in Danzai and Sandu, eastern Guizhou province. Because of the tectonic fluctuation activity, the sedimentary environments of the two outcrops changed and the Platform evolved from ramp shelf in the Middle Cambrian to rimmed shelf in Upper Cambrian. Since the late of Middle Proterozoic Era, the ocean crust evolved to continental crust gradually in Guizhou area. Therefore, there were two sedimentary models: a broad open sea shelf model with ramp platform and flat floor, formed in the Middle Cambrian; and a platform (ramp)-open sea(basin) sedimentary model, shaped in the Upper Cambrian. The sequence cycles was controled by the evolution of regional tectonics , and the sedimentary sequence characters are very important to the analysis of sedimentary environment.

关 键 词：寒武系 碳酸盐岩 贵州 层序地层 台地演化 

分 类 号：P534.41[天文地球—古生物学与地层学]