地质学报Issue(6)：114-126,13.
浙东南印支期花岗岩的锆石 U-Pb年代学、地球化学及构造意义
Zircon U-Pb Geochronology,Geochemistry and Tectonic Implication of Indosinian Granite from Southeastern Zhejiang,South China
摘要
Abstract
The Late Permian-Triassic granites in southeastern China have important tectonic significance for the evolution of East Asia.Two Indosinian granites found in the town of Dashuang as well as eastern Jingju areas of Songyang in Zhejiang have intruded into the Proterozoic basement,which lithology are porphyritic quartz syenite.LA-ICP-MS zircon U-Pb age of Dashuang syenite is 241 ±2.1 ~229.6 ±2.5Ma,and LA-ICP-MS zircon U-Pb ages of Jingju porphyritic quartz syenites are 245.7 ± 1.8Ma and 241.2 ±2.7Ma, which indicate that these two plutones are products of early Indosinian magmatism.For geochemical characteristic,the two granites are potassium-rich,high alumina,enriched in LREE and Rb,Th,U,K, depleted in Ba,Nb,Sr,P,Ti,close to the distribution patterns of Indosinian A-type granites in SE China,which indicate that they are all aluminum A-type granite.A series of A-type granites distribution along the NE-trending fracture show extensional tectonic setting of southeastern China in early Indosinian, which may be caused by strike-slip conversion stretching after collision between SCB(South China block) and IB(Indochina block),making magma intrusion along the fault.关键词
浙东南/印支期花岗岩/LA-MC-ICPMS/地球化学/构造意义Key words
southeastern Zhejiang/Indosinian granites/LA-MC-ICPMS/geochemistry/tectonic implication引用本文复制引用
高万里,王宗秀,李春麟,王对兴..浙东南印支期花岗岩的锆石 U-Pb年代学、地球化学及构造意义[J].地质学报,2014,(6):114-126,13.基金项目
本文为中国地质调查局地质调查项目（编号1212011121068）资助成果。 （）
