地质学报2017，Vol.91Issue(11)：2473-2492,20.
新疆肯登高尔铜钼矿区侵入岩年代学、地球化学及其大地构造意义
Geochronology and Geochemistry of the Pluton in the Kendenggaoer Cu-Mo Ore District, Xinjiang and Their Tectonic Implication
摘要
Abstract
The Kendenggaoer skarn Cu-Mo deposit,located in the Boluokenu metallogenic belt,is hosted in contact zone between the Dongtujiinhe Formation and the Nalinguole pluton.The Nalinguole pluton consists of granodiorite and monzogranite.LA-ICP-MS zircon U Pb dating yielded weighted average ages of 316.3±3.5 Ma for granodiorite and 298.9±3.3 Ma for monzogranite respectively,indicating that the granodiorite intruded in the Late Carboniferous,while the monzogranite intruded in the Early Permian.Geochemically,granodiorite from the Nalinguole pluton is characterized by high contents of SiO2 and Na2O,enrichment in Sr,Rb and Th and depletion in Nb,Ta,Yb and Y.all samples show no Eu anomalies and are similar to adakites,indicating that they were derived from partial melting of lower crust during late orogenic stage.Monzogranite has high contents of SiO2 and K2O and low content of Al2O3.All samples are enriched in Rb,Th,Nb,Hf and depleted in Sr,Ta and Ti,with obvious negative Eu anomalies,suggesting that they were generated by fractional crystallization of basic magma which was derived from further melting of the source region with the lithosphere reduction.Combining with both dating results,it can be inferred that the northwestern margin of Tianshan began to enter collisional orogenic stage in Late Carboniferous and gradually transited into post-orogenic stage in Early-Permian.关键词
LA-ICP-MS锆石U-Pb定年/二长花岗岩/花岗闪长岩/肯登高尔/西天山Key words
LA-ICP-MS zircon dating/granodiorite/monzogranite/Kendenggaoer/western Tianshan引用本文复制引用
王冠南,顾雪祥,章永梅,李卫东,曹景良,颜家辉..新疆肯登高尔铜钼矿区侵入岩年代学、地球化学及其大地构造意义[J].地质学报,2017,91(11):2473-2492,20.基金项目
本文为国家自然科学基金项目(编号41572062、U1303292、41302064)、中央返还两权价款资金综合研究项目(编号Y15-LQ04)和国家科技支撑计划项目(编号2011BAB06B02-02)联合资助成果. （编号41572062、U1303292、41302064）
