地质学报2017，Vol.91Issue(1)：80-93,14.
新疆中天山巴伦台地区花岗质侵入体地球化学、年代学研究及其构造意义
Geochemistry and Geochronology of Granitoids Intrusions from the Baluntai Area in Central Mountains, and Its Tectonic Significance
摘要
Abstract
Granitoids are widely distributed in Baluntai area,Central Tianshan Mountain.The LA-ICP-MS age of granitoids which are located in north of the Wuwamen fault are 452.7 ±1.4Ma and 455.5 ± 1.7Ma.Geochemitry results show that major elements belong to metaluminous calc-alkaline rocks series,and REEs are characterized by right-type distribution patterns and higher LaN/YbN (6.01～23.74)with weak negative Eu anomaly (δEu=0.67～0.83).In addition,they display LILE enrichment of Ba,Rb and Cs.HFSE depletion of obviously Nb and Ta negative anomalies,and slight Ti depletion.The results of Hf isotopes show that εHf(t) values vary from-14.8 to-9.4,with an average of-12.4,and TDM2 values vary from 1730 to 1997Ma,with an average of 1871Ma.The geochemical characteristics show that late Ordovician granitoids,which was the product of Early Proterozoic lower crust partial melting because of mantle-derived magma underplating brings a lot of heat,have characteristics of volcanic arc granites.Therefore,the Late Ordovician granitoids are considered as the earliest magma record of South Tianshan ocean basin northward subduction in the Baluntai area,Central Tianshan Mountains.关键词
岩石地球化学/年代学/Hf同位素/晚奥陶世/巴伦台/中天山Key words
geochemistry/geochronology/Hf isotopes/Late Ordovician/Baluntai/central Tianshan Mountains引用本文复制引用
李平,朱志新,穆利修,王克卓,王哲,屈涛,凤骏..新疆中天山巴伦台地区花岗质侵入体地球化学、年代学研究及其构造意义[J].地质学报,2017,91(1):80-93,14.基金项目
本文由中国地调局大调查项目“新疆巴伦台1∶5万 K45E006010、K45E007010、K45E007011、K45E008010、K45E008011 五幅区域地质调查”(编号:1212011140058)资助的成果. （编号:1212011140058）
