摘要
新疆中天山南缘地区广泛分布晚古生代侵入岩,对中天山南缘代京却克却地区二长花岗岩进行LA-ICP-MS锆石U-Pb定年,获得岩体结晶年龄为(394.7±2.9)Ma,属中泥盆世。岩石地球化学结果表明,该二长花岗岩为一套高钾钙碱性系列过铝质岩石,大离子亲石元素Rb,Th,K相对富集,高场强元素Nb,Ta,Ti,P相对亏损。结合区域地质背景,认为中天山南缘代京却克却地区二长花岗岩形成于火山弧环境,是幔源岩浆底侵带来的大量热能使得晚古生代下地壳物质发生部分熔融的产物。综合分析认为,该岩体可能代表了中泥盆世南天山洋向中天山微地块之下的俯冲岩浆活动记录。
Late Palaeozoic.Intrusive rocks are widely distributed in southern margin area of Central Tianshan Mountain.The LA-ICP MS age of zircon which are located in the Daijingquekeque are(394.7±2.9)Ma,Geochemistry results show that devonianmonzonitic granite major elements belong to High potassium peraluminous calc-alkaline rocks Series,which display LILE enrichment of Rb,Th and K,and HFSE depletion of Nb,Ta,Ti,P;Monzonitic granite that REEs are characterized by right type distribution patterns.The geochemical characteristics show that Devonian monzonitic granit,which was the product of Late Palaeozoic lower crust partial melting because of mantle-derived magma underplating brings a lot of heat,have characteristics of volcanic arc granites.Therefore,devonian monzonitic are considered as the earliest magma record of South Tianshan ocean basin northward subduction in the Daijingquekeque area,Central Tianshan Mountains.
作者
热孜婉古丽.阿不力孜
靳刘圆
杨硕
李平
朱志新
Reziwanguli Abulizi;Jin Liuyuan;Yang Shuo;Li Ping;Zhu Zhixin(College of Geology and mining engineering,Xinjiang University,Urumqi,Xinjiang,830046,China;Xinjiang institute of geological survey,Urumqi,Xinjiang,830000,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2018年第4期415-422,共8页
Xinjiang Geology
基金
新疆巴音布鲁克地区1:5万K45E007004
K45E007005
K45E007006
K45E007007
K45E007008五幅区域地质矿产调查(12120114058801)
新疆区域地质调查片区总结与服务产品开发(DD20160345-04)
新疆矿产资源调查成果综合集成与服务产品开发(DD20160346)共同资助
