摘要
野马泉楚鲁套海岩体分布于昆北断裂以北祁漫塔格岩浆弧东部,侵位于奥陶纪祁漫塔格群—志留纪滩间山群碎屑岩组和晚三叠世鄂拉山组,岩石类型主要为花岗斑岩和花岗闪长斑岩。岩石地球化学结果表明该岩体属准铝质—过铝质的钙碱性岩石系列,为A型花岗岩;稀土元素球粒陨石标准配分图呈右倾式,轻稀土富集,重稀土较为平坦,出现强烈Eu亏损;由多种主量及微量元素进行相关的构造环境判别,为后造山的伸展构造环境。在楚鲁套海花岗斑岩中获得了U-Pb同位素年龄为(256.0±9.6)M a,确定其侵位时代为晚二叠世。
The Chulutaohai acid intrusions are located in Yemaquan area,eastern Kunlun,between the Kunbei fault and Qimantage magmatic arc intruding into Ordovician clastic rock group of Qimartag Formation and the Late Triassic Elashan Group.The main type of rocks is granite-porphyry and granodiorite-porphyry.Major element,trace element and zircon LA-ICP-MS UPb data of Chulutaohai indicate that these intrusions are weakly meta-aluminous to peraluminous calc-alkaline A-type granite,reported in this paper,characterized by significant LILE（Rb,Ba,Th） and LREE and Nb-Ta,depleted with Eu seriously;and formed in post-orogenic extensional tectonic environment,which can be discriminated from variety of tectonic setting associated with trace elements and major elements.The Chulutaohai intrusions were dated at（256.0±9.6） Ma and determined the emplacement age in the Late Permian.
出处
《西北地质》
CAS
CSCD
2010年第4期159-167,共9页
Northwestern Geology
基金
中国地质调查局国土资源大调查项目"昆仑-阿尔金成矿带基础地质综合研究"(1212010911025)
关键词
地球化学
后造山
楚鲁套海
酸性侵入体
geochemistry
POG
Chulutaohai iron ore
acid intrusive rocks
