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首页> 外文期刊>Journal of Asian earth sciences >Zircon growth and ages of migmatites in the Algoma-type BIF-hosted iron deposits in Qianxi Group from eastern Hebei Province, China: Timing of BIF deposition and anatexis
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Zircon growth and ages of migmatites in the Algoma-type BIF-hosted iron deposits in Qianxi Group from eastern Hebei Province, China: Timing of BIF deposition and anatexis

机译：中国河北省东部迁西县前溪群中由Algoma型BIF赋存的铁矿床中锆石的生长和辉锰矿的年龄：BIF沉积和后生时间

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摘要

Algoma-type BIFs and associated volcanic suites of the Qianxi Group in eastern Hebei Province have undergone high-grade metamorphism and anatexis. The anatectic event is genetically related to high-grade magnetite ores, but the age of the anatectic melting has not been well constrained. We present detailed textural relationship and internal structures of zircon grains and their age data from eight samples of migmatitic rocks representing the different Algoma-type BIF-hosted iron deposits to constrain the formation age of BIF deposition and subsequent anatexis. Six continuous zircon growth stages are distinguished by a series of low-CL and high-CL zones outside from center to edge: inherited magmatic zircon, bright-CL resorption domain, dark-CL recrystallization front, dark-gray-CL diffusion domain, light-gray-CL overgrowth and bright-CL resorption edge. The overgrowths are interpreted as a solid-state diffusion of Zr of primary zircon during interaction with anatectic melt, which resulted in different stages of chemical re-equilibration of primary domains and local re-deposition of newly grown domains on the suitable isostructural substrate of residual magmatic zircon. SHRIMP zircon U-Pb dating of inherited magmatic cores and discrete magmatic grains constrains the peak BIF-deposition age at 2520 Ma, which is different from the peak at 2.75-2.70 Ga for Algoma-type BIFs elsewhere in the world. Zircon U-Pb dating of light-gray-CL rims and newly grown homogeneous grains indicates that the anatectic event lasted from 2511 to 2485 Ma at least, immediately following the BIF deposition. The BIF depositional event is consistent with widespread late Neoarchean magmatism, and the anatectic event is consistent with regional metamorphic events in the eastern part of the North China Craton. (C) 2015 Elsevier Ltd. All rights reserved.
机译：河北省东部前溪群的藻类型BIF和相关的火山岩层经历了高级变质作用和后生作用。食盐事件与高品位磁铁矿在遗传上相关，但食盐融化的年龄尚未得到很好的限制。我们介绍了锆石晶粒的详细结构关系和内部结构，以及来自代表不同Algoma型BIF承载铁矿床的8个igma岩岩石样品的年龄数据，以限制BIF沉积的形成年龄和随后的厌食症。六个连续的锆石生长阶段以从中心到边缘的一系列低CL和高CL区为特征：继承的岩浆锆石，亮CL吸收域，暗CL重结晶前缘，暗灰色CL扩散域，光-灰色CL过度生长和明亮CL吸收边缘。过度生长被解释为初级锆石与阳极熔体相互作用过程中的Zr固态扩散，从而导致初级结构域化学重新平衡的不同阶段，以及新生长的结构域在残余物的合适同质结构基质上的局部重新沉积。岩浆锆石。继承岩浆核心和离散岩浆晶粒的SHRIMP锆石U-Pb测年法限制了BIF沉积的峰值年龄为2520 Ma，这不同于世界其他地方的Algoma型BIF的峰值2.75-2.70 Ga。浅灰色CL轮缘和新近生长的均匀晶粒的锆石U-Pb年代测定表明，在BIF沉积之后，食盐事件至少从2511持续到2485 Ma。 BIF沉积事件与晚新古纪的岩浆作用相一致，而华北事件与华北克拉通东部的区域变质事件相一致。 （C）2015 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2015年第3期|1017-1034|共18页
  • 作者

    Li Li-Xing; Li Hou-Min; Xu Ying-Xia; Chen Jing; Yao Tong; Zhang Long-Fei; Yang Xiu-Qing; Liu Ming-Jun;

  • 作者单位

    Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China;

    Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China;

    Hebei United Univ, Coll Min Engn, Tangshan 063009, Peoples R China;

    Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China;

    Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China;

    Hebei United Univ, Coll Min Engn, Tangshan 063009, Peoples R China;

    Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China;

    Liaoning Bur Met Geol Explorat, Inst Geol Explorat, Anshan 114002, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Banded iron formation; Algoma; Migmatite; Zircon; Eastern Hebei; North China Craton;

    机译：带状铁形成;铝镁铁矿;蒙脱石;锆石;冀东;华北克拉通;

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