| 朝阳北部早前寒武纪变质杂岩地质事件序列 |
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| 引用本文： | 刘树文,王伟,白翔,张帆,杨鹏涛.朝阳北部早前寒武纪变质杂岩地质事件序列[J].岩石学报,2010,26(7):1993-2004. |
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| 作者姓名： | 刘树文 王伟 白翔 张帆 杨鹏涛 |
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| 作者单位： | 北京大学造山带与地壳演化教育部重点实验室,北京,100871 |
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| 基金项目： | 国家自然科学基金项目（40872120、40821002） |
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| 摘 要： | 朝阳北部早前寒武纪变质杂岩是华北克拉通北缘承德-阜新变质地块的一个重要组成部分,主要由一套变质火山岩、火山碎屑岩及其相伴生沉积岩等表壳岩组成,被TTG片麻岩、辉长岩和石英闪长岩等深成侵入体侵位。这些表壳岩和深成侵入体均经历了高角闪岩相变质作用。表壳岩中石榴石斜长角闪岩(CY004-3),其原岩岩浆结晶年龄为2513～2520Ma,遭受了2447Ma变质作用改造。石榴石透辉石斜长角闪岩(CY006-6),其原岩岩浆结晶年龄2481～2568Ma,记录了～2400Ma变质事件。小角度切割变质火山岩和磁铁石英岩的早期二长花岗质片麻岩脉体,岩浆结晶年龄为2496～2501Ma,表明这些变质火山岩的岩浆结晶年龄应在2500Ma以上。侵位于这些变质层状岩系内的不同规模的深成侵入体记录了古元古代早期重要的岩浆事件。石榴石辉石斜长角闪岩(CY004-4),原岩为辉长岩,岩浆就位年龄为2394Ma,记录2354Ma的变质年龄。黑云角闪斜长片麻岩(CY005-1),原岩为石英闪长岩,其岩浆就位结晶年龄为～2403Ma。变质辉长辉绿岩(CY014-1)给出了2399～2404Ma的岩浆就位结晶年龄。上述变质火山岩等表壳岩系主期变质作用发生在古元古代(2350～2460Ma),与变质深成侵入体就位同时发生。这些年代学结果表明,这一地区大规模的铁镁质火山喷发作用发生在新太古代末期,在古元古代(2350～2460Ma)发生主期变质作用和深成岩浆作用。
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| 关 键 词： | LA-ICP-MS 锆石年代学 地质事件序列 早前寒武纪变质杂岩 朝阳北部 |
| 收稿时间： | 5/1/2010 12:00:00 AM |
| 修稿时间： | 2010/6/25 0:00:00 |
Geological events of Early Precambrian complex in North Chaoyang area, Liaoning Province |
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| LIU ShuWen,WANG Wei,BAI Xiang,ZHANG Fan and YANG PengTao.Geological events of Early Precambrian complex in North Chaoyang area, Liaoning Province[J].Acta Petrologica Sinica,2010,26(7):1993-2004. |
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| Authors: | LIU ShuWen WANG Wei BAI Xiang ZHANG Fan and YANG PengTao |
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| Institution: | Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China;Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, Peking University, Beijing 100871, China |
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| Abstract: | Early Precambrian complex in North Chaoyang area,Liaoning Province,is an important part of the Chengde-Fuxin metamorphic block,in the northern margin of the North China Craton and consists mainly of supracrustal rock sequence of metamorphic volcanic rock,volcaniclastic rock and related sedimentary rock series,which were emplaced by TTG,gabbro and quartz diorite.These supracrustal rock sequence and paleopluton experienced high-grade amphibolite facies metamorphism.LA-ICP-MS zircon U-Pb isotopic dating reveal... |
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| Keywords: | LA-ICP-MS Zircon chronology Geological events Early Precambrian complex North Chaoyang area |
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