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《Journal of Stratigraphy》 2017-03
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ZIRCON U-PB AGE CONSTRAINTS ON THE CHRONOSTRATIGRAPHY OF THE BAIZHUPING FORMATION,NORTHERN YANGTZE BLOCK

LIU Hao;XU Da-liang;WEI Yun-xu;PENG Lian-hong;DENG Xin;ZHAO Xiao-ming;CHEN Tie-long;KE Xian-zhong;Wuhan Center of China Geological Survey;Key Laboratory of Paleontology and Coevolution of Life and Environment,CGS;Hubei Geological Survey;  
The volcanic-subvolcanic Baizhuping Formation in the northern margin of the Yangtze block is mainly composed of metamorphosed felsic tuffs,intermediate-felsic lavas,and felsic hypabyssal intrusive rocks.Due to regional metamorphism,some rocks have been transformed into sericite-bearing slate or albite-bearing leptynite with minor pyrite.On the basis of stratigraphic contacts,previous researchers regarded this suite of rocks as Neoproterozoic sedimentary rocks of the Qingbaikouan System.In this contribution,we present LA-ICP-MS zircon U-Pb ages for the garnet-bearing rhyolite porphyry and biotite granulite from the Dashuya area.Zircon U-Pb dating of the garnet-bearing rhyolite porphyry yielded an age of 1852±16 Ma(MSWD=0.65),whereas dates for the biotite granulite can be divided into two groups at 1856±24 Ma and 1959±11 Ma,the older age probably coming from xenoliths.Geochronologic data suggest that the volcanic-subvolcanic Baizhuping Formation was formed in the Paleoproterozoic.We propose that these rocks are related to break-up of the Columbia super-continent.In addition,we infer that the xenoliths in the biotite granulite have a geodynamic setting similar to the Bashansi gneiss.
【Fund】: 中国地质调查局基础地质调查项目(No.12120113061700 No.DD20160029)资助
【CateGory Index】: P588.14;P597.3
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