| 阴山地块晚太古代岩浆作用、变质作用对地壳演化及BIF成因的启示 |
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| 引用本文： | 马旭东,范宏瑞,郭敬辉.阴山地块晚太古代岩浆作用、变质作用对地壳演化及BIF成因的启示[J].岩石学报,2013,29(7):2329-2339. |
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| 作者姓名： | 马旭东 范宏瑞 郭敬辉 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所矿产资源研究重点实验室,北京,100029
2. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京,100029 |
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| 基金项目： | 本文受国家重点基础研究发展计划"973"项目(2012CB416605);国家自然科学基金项目(41202138)和博士后基金(2012M510539)联合资助. |
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| 摘 要： | 阴山地块是华北克拉通西部太古代基底出露最大最完整的地区.固阳地区是阴山地块最具代表性的地区,主要由中西部低级别变质的晚太古代花岗-绿岩地体和东部的高级变质杂岩地体组成.统计结果表明,无论是绿岩带,花岗岩类侵入体,还是高级别变质杂岩的原岩都形成于晚太古代末期(2562 ～ 2510Ma),形成时间上相互重叠,在～2500Ma,～2480Ma分别经历了两期变质事件,第一期为逆时针的P-T轨迹,与洋脊俯冲有关；第二期则表现顺时针的P-T轨迹,与晚期碰撞造山有关.科马提岩-科马提质玄武岩、高镁安山岩-富Nb火山岩、TFG和Sanukitoid多种具有特殊构造意义的岩石同时发育.综合已有资料获得如下启示,阴山地块在晚太古代受板块体制控制,并先后经历了洋脊俯冲和碰撞造山过程.将区域内的BIF与相关岩石联系起来考虑,得出BIF的形成与洋脊俯冲有关,BIF中的Si来源于绿岩带底部的玄武岩,Fe来源于同层位的科马提岩.
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| 关 键 词： | 岩浆作用 变质作用 阴山地块 BIF成因 地壳演化 |
| 收稿时间： | 3/1/2013 12:00:00 AM |
| 修稿时间： | 2013/5/23 0:00:00 |
Neoarchean magmatism, metamorphism in the Yinshan Block: Implication for the genesis of BIF and crustal evolution |
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| MA XuDong,FAN HongRui and GUO JingHui.Neoarchean magmatism, metamorphism in the Yinshan Block: Implication for the genesis of BIF and crustal evolution[J].Acta Petrologica Sinica,2013,29(7):2329-2339. |
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| Authors: | MA XuDong FAN HongRui and GUO JingHui |
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| Institution: | Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | The Yinshan Block is a coherent Neoarchean basement of the Western Block in the North China Craton. The representative is at Guyang area, which composed of granite-greenstone rocks at western and high-grade metamorphic complexes at eastern. The result of statistics of zircon U-Pb age statistics show either the granite-greenstone or the protoliths of the high-grade metamorphic complexes formed at the late Neoarchean (2562~2510Ma), and experienced two stage metamorphic event at ~2500Ma, ~2480Ma respectively. The P-T path of the ~2.50Ga metamorphism is an anti-clockwise type, which is related with the mid-oceanic ridge subduction. There are a variety of special rocks which indicating the certain tectonic background in this area, such as: komatiite, komatiitic basalt, Nb-rich basalt, high-Mg andesite, TTGs and Sanukitoid. In conclusion, the Yinshan block is controlled by the plate tectonics, and experienced the mid-oceanic ridge subducted and collision orogeny successively. The BIFs in this are related with the mid-oceanic ridge subduction. The Si and Fe of BIFs are derived from the basalt at the bottom of greenstone belt and the komatiite, respectively. |
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| Keywords: | Magmatism Metamorphism Yinshan Block Genesis of BIF Crustal evolution |
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