塔里木盆地阿尔塔什剖面白垩—第三系界线事件的地球化学标志  

GEOCHEMICAL MARKERS OF THE CRETACEOUS-IERTIARY BOUNDARY EVENT IN THE ALTAX SECTION,TARIM BASIN

作　　者：叶得泉[1] 唐文松[1] 魏景明[1] 徐道一[2] 毛雪瑛 

机构地区：[1]中国石油天然气总公司 [2]国家地震局地质研究所 [3]中国科学院

出　　处：《石油学报》1992年第2期202-208,共7页Acta Petrolei Sinica

摘　　要：通过对塔里木盆地阿尔塔什剖面白垩—第三系界线事件的标志研究表明,存在着铱异常和伴生的微量元素及稀土元素异常,这是灾变事件的地球化学标志,据此可划分白垩—第三系界线,同时可将界线置于吐依洛克组底面上约1.42m处。A Study of the Cretaceous-Tertiary boundary layers in the Altax section, Tarim basin,China, has resulted in iridium anomaly and associated trace elemnt and rare earth elementanomalies, which may be served as geochemical markers of a catastrophic event. Based on thebove-mentioned evidences the Cretaceous-Tertiary boundary in the Altax section can beplaced at a position 1.4m above the base of Tuilok Formation in this region.

关 键 词：盆地 地层划分 白垩纪 第三纪 

分 类 号：P534.53[天文地球—古生物学与地层学]