大青山地区2.5 Ga紫苏花岗岩——对深熔石榴花岗岩成因模式的启示  

Discovery of ca.2.5 gacharnockite in the Daqing Mountains——Implications for the petrogenetic model of anatectic garnet granite

作　　者：石强 马龙 陈湘智 徐仲元[3] 李世超[3] 徐进贵 陈开运[1] SHI Qiang;MA Long;CHEN Xiangzhi;XU Zhongyuan;LI Shichao;XU Jingui;CHEN Kaiyun(State Key Laboratory of Continental Dynamics,Northwest University,Xi’an,710069;College of Mining Engineering,Liaoning Technical University,Fuxin,Liaoning,123000;College of Earth Science,Jilin University,Changchun,130061;Shandong Gold Guilaizhuan Deposit Co.Ltd.,Pingyi,Shangdong,273306)

机构地区：[1]西北大学大陆动力学国家重点实验室,西安710069 [2]辽宁工程技术大学矿业学院,辽宁阜新123000 [3]吉林大学地球科学学院,长春130061 [4]山东黄金归来庄矿业有限公司,山东平邑273306

出　　处：《地质论评》2024年第3期1139-1144,共6页Geological Review

基　　金：西北大学大陆动力学国家重点实验室开放课题基金资助项目(编号:22LCD11);辽宁省教育厅基本科研项目(编号:LJKMZ20220689);第73批中国博士后基金资助项目(编号:2023M732837);国家自然科学基金资助项目(编号:41872194,U2244211)的成果。

摘　　要：华北克拉通北缘西部陆块早前寒武纪基底分布广泛,现有的研究普遍认为经历2.5 Ga,2.45~2.37 Ga,1.95 Ga和1.85 Ga变质热事件影响。华北克拉通北缘阴山陆块中2.5 Ga的紫苏花岗岩研究已经成为了揭示华北克拉通北缘早前寒武纪构造演化的一个热点,但孔兹岩带中却鲜少有新太古代晚期构造热事件的相关报道。近年来,相继从大青山地区的孔兹岩带石榴黑云母片麻岩中分辨出一期具有2.45~2.37 Ga变质锆石年龄的大青山表壳岩,同时出露与其成因关系密切的深熔石榴花岗岩,但其深熔成因的模式存在争议。本文对大青山地区新发现的新太古代晚期紫苏花岗岩、石榴花岗岩及其围岩的野外空间产出关系和锆石年代学进行对比分析,为探究深熔石榴花岗岩成因模式提供重要的启示。In China,the early Precambrian basement of the Western block is widely distributed on the northern margin of the North China Craton.Previous study generally suggests that these old rock was influenced by four metamorphic thermal events at ca.2.5 Ga,ca.2.45~2.37 Ga,ca.1.95 Ga and ca.1.85 Ga.The study of the ca.2.5 Ga charnockite from the Yinshan Block which has become a hot topic in revealing the early Precambrian tectonic evolution of on the northern margin of the North China Craton,however,there are few reports of late Neoarchean tectonic thermal events in the Khondalite Belt.In recent years,a stage of Daqing Mountains supracrustal rock,with a metamorphic zircon age at 2.45~2.37 Ga,has been identified from the Khondalite Belt(eg.Garnet biotite gneiss)of the Daqing Mountains area.In field,the Daqing Mountains supracrustal rock and anatectic garnet granite are closely related to each other,however,the mode of its anatectic genesis is still controversial.Herein,we present new geochronological of zircon U-Pb isotopic data via analysis using a sensitive high-resolution ion microprobe for charnockites,and comparing the field spatial output relationship and zircon chronologyits analysis to the garnet granite and its surrounding rocks in the Daqing Mountains terrane.Our aims are to provide the important insights for exploring the genetic model of anatectic garnet granite.

关 键 词：大青山地区 紫苏花岗岩 石榴花岗岩 成因模式 

分 类 号：P588.121[天文地球—岩石学]