Sedimentary environment of the Dajin

Sedimentary environment of the Dajin conglomerate in Tibet, age of foraminiferan assemblages and their tectonic signific

The Dajin conglomerate, which is one of the most important sedimentary successions of the Xigaze forearc basin in Tibet, China, consists of deep-shallow marine tuffaceous turbidites and clastic rocks bearing Nummulites, Assilina, Alveolina and Lockhartia. These fossils are very similar to the foraminiferan in the Jialazi and Maila conglomerates, and those in Gangba and Dingri areas.They developed in the Eocene. By analyzing the spatial variation of Eocene sedimentary environments of Tibet Plateau and the foraminiferan in the Dajin conglomerate, we found that Eocene sedimentation should take place on both sides of the Yarlung Tsangpo suture, and the late Eocene tectonic uplifting should make the forearc basin expose out of the sea level and begin to receive nonmarine deposits.

作 者： YAN Zhen FANG Aimin PAN Yusheng LI Jiliang LIU Xiaohan YU Liangjun ZHANG Binggao   作者單位： YAN Zhen,FANG Aimin,PAN Yusheng,LI Jiliang,YU Liangjun(Laboratory of Lithosphere Tectonic Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029,China)

LIU Xiaohan(Institute of Tibet Plateau Research, Chinese Academy of Sciences, Beijing 100029, China)

ZHANG Binggao(Nanjing Institute of Paleontology, Chinese Academy of Sciences, Nanjing 210008, China) 

刊 名： 自然科學進展（英文版）  SCI 英文刊名： PROGRESS IN NATURAL SCIENCE  年，卷(期)： 2005 15(11)  分類號： P3  關鍵詞： Dajin conglomerate   marine deposits   Eocene foraminiferan   Yarlung Tsangpo suture  

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