Zircon U-Pb SHRIMP Ages from the Late Paleozoic Turpan-Hami Basin,NW China  

作　　者：Xiang Mao Jianghai Li Huatian Zhang 

机构地区：[1]The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences,Peking University [2]Institute of Oil and Gas, Peking University

出　　处：《Journal of Earth Science》2014年第5期924-931,共8页地球科学学刊（英文版）

基　　金：supported by the Chinese MOST 973 Program (No. 2009CB219302)

摘　　要：Permian volcanic rocks are widely distributed in the Turpan-Hami Basin, which is part of the Central Asian orogenic belt. Here we present SHRIMP zircon data for the rhyolite in Well Baocan 1, one of the deepest wells in the basin. The 283.9±2.7 Ma reported in our study provides the best precise age determination for the Yierxitu Formation, the oldest Permian layer of Hami Depression, one of the three substructural units of the Turpan-Hami Basin, and a potential hydrocarbon reservoir in this basin. Our data refines earlier imprecise 39^Ar-40^Ar ages and shows that the volcanic rocks both inside the Turpan-Hami Basin and along its margin are almost coeval. We delineate a collisional orogenesis, and the new age of 283.9±2.7 Ma may limit the latest time of the collision orogenesis.Permian volcanic rocks are widely distributed in the Turpan-Hami Basin, which is part of the Central Asian orogenic belt. Here we present SHRIMP zircon data for the rhyolite in Well Baocan 1, one of the deepest wells in the basin. The 283.9±2.7 Ma reported in our study provides the best precise age determination for the Yierxitu Formation, the oldest Permian layer of Hami Depression, one of the three substructural units of the Turpan-Hami Basin, and a potential hydrocarbon reservoir in this basin. Our data refines earlier imprecise 39^Ar-40^Ar ages and shows that the volcanic rocks both inside the Turpan-Hami Basin and along its margin are almost coeval. We delineate a collisional orogenesis, and the new age of 283.9±2.7 Ma may limit the latest time of the collision orogenesis.

关 键 词：SHRIMP U-Pb zircon geochronology Turpan-Hami Basin PERMIAN Yierxitu Forma-tion Central Asian orogenic belt. 

分 类 号：P534.4[天文地球—古生物学与地层学] P597.3[天文地球—地质学]