摘要
年代学和地球化学研究结果表明:清白山岩体LA-ICP-MS锆石U-Pb加权平均年龄为(411.6±8.2)Ma,为晚古生代早期岩浆活动产物。在地球化学组成上,清白山花岗岩体总体呈现过铝质高钾钙碱性I型花岗岩特征。微量元素总体分异程度较强,以富集Th,U和K,Rb,K等大离子亲石元素,亏损P,Ti等高场强元素为特征,岩浆来源为壳幔混合来源。结合前人研究资料及区域地质特征,认为清白山花岗岩体是在晚古生代早期古亚洲洋板块向塔里木板块俯冲的同碰撞环境下形成的。
The Qingbaishan rock mass is mainly composed of granite.The results of chronology and geochemistry show that the LA-ICP-MS zircon U-Pb weighted average age of the rock mass is(411.6±8.2)Ma,which is the product of the early Paleozoic magmatism.In terms of geochemical composition,the Qingbaishan granite body is characterized by a high-potassium-calcium-type I-type granite.The trace elements are generally highly differentiated,and are characterized by enrichment of large ion lithophile elements such as Th,U and K,Rb,K,and high-field strength elements such as P and Ti.The magma source is a mixed source of crust and mantle.Combined with the geological characteristics of the previous research data,this paper believes that the Qingbaishan granite body was formed in the same collision environment in the early Paleozoic Paleo-Asian ocean plate subduction to the Tarim board.
作者
付鹏飞
夏冬
弓小平
孙乾龙
杨洋
魏杰
赵起
Fu Pengfei;Xia Dong;Gong Xiaoping;Sun Qianlong;Yang Yang;Wei Jie;Zhao Qi(Scholl of Geology and Exploration Engineering,XinJiang University,Urumqi,Xinjaing,830046,China;Xinjiang Uygur Autonomous Region geology survey institute,Urumqi,Xinjiang,830000,China)
出处
《新疆地质》
CAS
CSCD
北大核心
2020年第1期25-31,共7页
Xinjiang Geology
基金
新疆自治区高校科研计划项目(XJEDU2019l007)
国家自然科学基金项目(41562010)联合资助。
