| 吉林南部新太古代末地壳深熔作用——来自变质石英闪长岩及淡色花岗岩的证据 |
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| 引用本文： | 刘建辉.吉林南部新太古代末地壳深熔作用——来自变质石英闪长岩及淡色花岗岩的证据[J].岩石矿物学杂志,2022,41(2):303-321. |
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| 作者姓名： | 刘建辉 |
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| 作者单位： | 中国地质科学院 地质研究所, 北京 100037;自然资源部深地动力学重点实验室, 北京 100037 |
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| 基金项目： | 国家自然科学基金(41772195,42172218,42072223)；;中国地质调查局项目(DD20190358,DD20201116,DD20211116)； |
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| 摘 要： | 深熔作用是大陆地壳分异、元素迁移富集和混合岩化作用的主要机制和关键地质过程.吉南地区出露的太古宙基底普遍经历了角闪岩相-麻粒岩相变质及深熔作用,长英质淡色体及淡色花岗岩广泛分布.吉南和龙花岗-绿岩地体出露的太古宙变质石英闪长岩及相关的长英质浅色体和含斜方辉石(角闪石)淡色伟晶花岗岩的野外地质特征、相互关系及岩相学特征指...
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| 关 键 词： | 深熔作用 长英质浅色体 吉南地区 混合岩化 华北克拉通 |
| 收稿时间： | 2021/10/22 0:00:00 |
| 修稿时间： | 2022/1/7 0:00:00 |
Late Neoarchean crustal anatexis in the southern Jilin Province:Evidence from metamorphic quartz diorite and associated leucogranite |
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| LIU Jian-hui.Late Neoarchean crustal anatexis in the southern Jilin Province:Evidence from metamorphic quartz diorite and associated leucogranite[J].Acta Petrologica Et Mineralogica,2022,41(2):303-321. |
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| Authors: | LIU Jian-hui |
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| Institution: | Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Beijing 100037, China |
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| Abstract: | Anatexis is the main mechanism and key geological process of continental crustal differentiation, element migration and enrichment and migmatization. The Archean basement exposed in the southern Jilin Province, in which felsic leucosome and leucogranites are extensively distributed, widely experienced amphibolite-granulite facies metamorphism and anatexis. The field geological characteristics, correlation and petrographic characteristics of the Archean metamorphic quartz diorite and associated felsic leucosome and orthopyroxene (Opx)- and amphibole (Amp)-bearing pegmatite granite occurred in Helong granite-greenstone terrane in the southern Jilin Province indicate that the metamorphic quartz diorite underwent partial melting and in-situ segregation and accumulation of melt. The integrated analyses of zircon cathodoluminescence (CL) images, in-situ U-Pb geochronology, trace elements and Hf isotope on the metamorphic quartz diorite and pegmatite granite show that they have the same types of magmatic and metamorphic recrystallized zircons, the latter is dominated by metamorphic recrystallized zircons, that the metamorphic quartz diorite has magmatic crystallization age of 2 535 ±14 Ma, and that their magmatic zircons have consistent Hf isotope composition. Their metamorphic recrystallized zircons yield consistent metamorphic ages of 2 495±22 Ma and 2 491±10 Ma, respectively, and have identical Hf isotope compositions, which are consistent with that of magmatic zircons, Th and U contents and Th/U ratios, indicating that both metamorphic recrystallized and magmatic zircons have initial crystalline zircons formed in the same magmatic source, and further demonstrating that the metamorphic quartz diorite experienced metamorphic anatexis at ca. 2.5 Ga and that the Opx- and Amp-bearing pegmatite granite derived from in-situ partial melting of the metamorphic quartz diorite, in combination of the coeval strong and extensive magmatism and amphibolite-granulite facies metamorphism with counterclockwise p-T path at the end of Neoarchean in the North China Craton as well as the southern Jilin Province, which may reflect the thermal effect of mantle material upwelling on the continental crust during formation and stabilization of the craton lithosphere. |
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| Keywords: | anatexis felsic leucosome the southern Jilin Province migmatization North China Craton |
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