西北地质2017，Vol.50Issue(4)：41-50,10.
甘肃北山大山头南花岗闪长岩SHRIMP锆石U-Pb定年及其地质意义
SHRIMP Zircon U-Pb Age of the Dashantounan Granodioritein from Beishan Mountains in Gansu Province and its Signification
摘要
Abstract
Using the SHRIMP zircon U-Pb dating methods,the diagenesisage of the Dashantounangranodiorite has been obtained for the first time.The obtained 206Pb/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-t-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 geologicalbackground,that is,theymight beformed in a post-orogenic extensional setting or a late-stage of syn-orogenic setting.关键词
大山头南花岗闪长岩/锆石SHRIMP U-Pb定年/甘肃北山Key words
Dashantounan granodiorite/zircon SHRIMP U-P bdating/Beishan in Gansu分类
天文与地球科学引用本文复制引用
王磊,杨建国,王小红,齐琦,谢燮..甘肃北山大山头南花岗闪长岩SHRIMP锆石U-Pb定年及其地质意义[J].西北地质,2017,50(4):41-50,10.基金项目
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)和“祁连成矿带肃南—大柴旦地区地质矿产调查”(DD20160012)联合资助 （DD20160009）
