Title: U-Pb Dating of Carboniferous Sandstone Detrital Zircon from the North of the Bogda Mountains,Eastern Xinjiang,and Its Geological Significances
Abstract: This paper studied the age distribution of detrital zircons of sandstone in Shaleisaierke Formation and Shamaershayi Formation of Carboniferous System using LA-ICPMS U-Pb isotopic age of zircons.The results show that the detrital zircons of Shaleisaierke Formation has a wide range of zircon age from 298Ma to 2215Ma,and distributes mainly between 298Ma and 344Ma,with a peak at 305Ma and a second peak at between 501~538Ma.In addition,there is also one detrital zircon with an age of 1354Ma,and other two detrital zircons with ages of 2146Ma.and 2215Ma.The Shamaershayi Formation has a narrow(280 ~523Ma)and centralized age distribution(299~358Ma),with a dominant peak at 345Ma,and some lesser peaks between 428~450Ma and 507~523Ma,respectively.Based on the petrology of samples,the contents of Th U,CL image of dated zircon,in combination with regional geology analysis,the following conclusions have been achieved.(1)The age of the strata in the northern part of Bogda mountain,which was originally defined to be Carboniferous period,should be early carboniferous to early Permian;the age of the Qisiguertao Group is later Early Carboniferous to early Late Carboniferous.Julideneng Formation~Yangbulake Formation and Shamaershayi Formation should be middle or later middle Carboniferous to early Late Carboniferous and early Early Permian respectively.(2)The sandstones of the Shaleisaierke Formation and Shamaershayi Formation come from the eastern of Junggar basin,with the main source of the sandstone forming earlier than or the same age as the Carboniferous stratum in the study area.(3)The Late Paleozoic Bogda rift started in Early carboniferous,and began to decay in Late carboniferous with two weak orogenies,then finally declined during the Xiazihe Stage of middle Permian.
Publication Year: 2010
Publication Date: 2010-01-01
Language: en
Type: article
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Cited By Count: 11
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