REDOX VARIATIONS OF THE ANCIENT OCEAN IN THE WESTERN MARGIN OF THE TARIM BASIN——THE EVIDENCE FROM Ce ANOMALIES OF MARINE SHELL FOSSILS  

作　　者：吴明清 欧阳自远 宋云华 蓝琇 杨学长 毛雪瑛 柴之芳 

机构地区：[1]Institute of Geochemistry, Academia Sinica, Guiyang 850002, PRC [2]Nanjing Institute of Geology and Palaeontology, Academia Sinica, Nanjing 210008, PRC [3]Institute of High Energy Physics, Academia Sinica, Beijing 100080, PRC

出　　处：《Science China Chemistry》1992年第9期1110-1120,共11页中国科学（化学英文版）

摘　　要：Two episodes of paleoredox fluctuation variation are indicated in some localities in thelate Cretaceous--early Tertiary ocean of western Tarim recorded by REE distribution patterns,Ce anomalies, and Th/U ratios from systematic studies on the chemical composition, withspecial reference to REE and 20 trace elements, based on 11 marine shell fossils occurringin the Upper Cretaceous--Lower Tertiary strata of the western Tarim Basin, Xinjiang. Thefactors Controlling the redox fluctuation may be probably caused by shifting places ofsurface runoff put into the sea as a result of transgression and regression.Two episodes of paleoredox fluctuation variation are indicated in some localities in the late Cretaceous--early Tertiary ocean of western Tarim recorded by REE distribution patterns, Ce anomalies, and Th/U ratios from systematic studies on the chemical composition, with special reference to REE and 20 trace elements, based on 11 marine shell fossils occurring in the Upper Cretaceous--Lower Tertiary strata of the western Tarim Basin, Xinjiang. The factors Controlling the redox fluctuation may be probably caused by shifting places of surface runoff put into the sea as a result of transgression and regression.

关 键 词：TARIM Basin SHELL FOSSIL rare earth element CE anomaly redox condition 

分 类 号：O6[理学—化学]