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《Northwestern Geology》 2017-04
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SHRIMP Zircon U-Pb Age of the Dashantounan Granodioritein from Beishan Mountains in Gansu Province and its Signification

WANG Lei;YANG Jianguo;WANG Xiaohong;Qi Qi;Xie Xie;Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits,MLR,Xi’an Center of China Geological Survey;  
Using the SHRIMP zircon U-Pb dating methods,the diagenesisage of the Dashantounangranodiorite has been obtained for the first time.The obtained ~(206)Pb/~(208 )Pb weighted average age is(386±6)Ma(MSWD=1.06),standing for the Dashantounan granodiorite was formed in middle Devonian.At the same time,the inherited zircon age has been obtained for the first time,and the yielded age is(885±20)Ma(MSWD=1.18),whichserves as a reflection of the Neoproterozoic tectonic-thermal event.The diagenetic age between the age of Dashantourock mass(397±4)Ma and the ones of Dashantounan rock mass(374±3)Ma.After analyzing the previous research achievements,it’s believed that themagmatic intrusionin the Middle-lateDevoniannot only includeintermediate-acidic magmas,but also include basic-ultrabasicmagma in the studying area.Theintermediate-acidic and basic-ultrabasicmagma might be formed in the same geological background,that is,theymight beformed in a post-orogenic extensional setting or a late-stage of syn-orogenic setting.
【Fund】: 中国地质调查局项目“天山—北山成矿带那拉提—营毛沱地区地质矿产调查”(DD20160009);“祁连成矿带肃南—大柴旦地区地质矿产调查”(DD20160012)联合资助
【CateGory Index】: P588.12;P597.3
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