...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Asian earth sciences >Whole-rock geochemical and zircon Hf-0 isotopic constraints on the origin of granitoids and their mafic enclaves from the Triassic Mishuling pluton in West Qinling, central China
【24h】

Whole-rock geochemical and zircon Hf-0 isotopic constraints on the origin of granitoids and their mafic enclaves from the Triassic Mishuling pluton in West Qinling, central China

机译：中国西部秦岭三叠系米树岭岩体对花岗岩及其镁铁质飞地起源的全岩地球化学和Hf-0同位素约束

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The origin of mafic microgranular enclaves (MMEs) in granitoids bears significant information on their petrogenesis. An integrated study including petrology, mineralogy and geochemistry was carried out for monzogranites and the hosted MMEs as well as biotite granites from the Mishuling pluton in the West Qinling, central China. LA-ICPMS zircon U-Pb dating yields similar emplacement ages of 212 +/- 2 Ma to 217 +/- 3 Ma for the monzogranites, biotite granites and MMEs. All of them display similar whole-rock Sr-Nd-Hf-O isotope and in-situ zircon Hf-O isotope compositions, suggesting their origination from common crustal sources, most likely meta-igneous rocks.MMEs have igneous textures, and contain acicular apatite and amphibole. Plagioclase with distinct core-rim compositions and clinopyroxene with replacement texture by amphibole have also been observed in MMEs. These features suggest that MMEs were formed by mixing of an intermediate magma with a felsic magma. Biotite granites are weakly peraluminous, and have high zircon delta O-18 values of 7.6-8.8 parts per thousand and low zircon saturation temperatures, indicating their derivation from partial melting of crustal rocks at relatively low temperatures. Compared with biotite granites, monzogranites are metaluminous, have high zircon saturation temperatures, and contain amphibole, reminiscent of typical I-type granites. However, they also show high in-situ zircon 8180 values of 7.9-9.2 parts per thousand. These geochemical features indicate that monzogranites were derived from crustal rocks at elevated temperatures. The sources themselves have experienced low-temperature interaction with surface waters. Therefore, partial melting of crustal rocks at different temperatures plays an important role in dictating the geochemical diversity of the resulted granitoids.
机译：花岗岩中的镁铁质微颗粒飞地（MME）的起源具有有关其成岩作用的重要信息。对华中西部秦岭米蜀岭岩体中的辉长花岗岩，MMEs和黑云母花岗岩进行了包括岩石学，矿物学和地球化学的综合研究。 LA-ICPMS锆石U-Pb测年产生了类似的变位年龄，分别为212 +/- 2 Ma至217 +/- 3 Ma的辉长岩，​​黑云母花岗岩和MME。它们都显示出相似的全岩石Sr-Nd-Hf-O同位素和原位锆石Hf-O同位素组成，表明它们起源于常见的地壳来源，最有可能为亚火成岩.MME具有火成岩质地，并含有针状磷灰石和闪石。在MMEs中也观察到了具有独特的核心-边缘组成的斜长石酶和具有角闪石替代结构的环吡咯烯。这些特征表明，MME是通过将中等岩浆与长岩浆混合而形成的。黑云母花岗岩具有弱的钙铝矿质，锆石δO-18值较高，为千分之7.6-8.8，锆石饱和温度较低，这表明它们源自地壳岩石在相对较低的温度下部分熔融。与黑云母花岗岩相比，单变花岗岩是金属的，锆石饱和温度高，并且含有闪石，让人想起典型的I型花岗岩。但是，它们也显示出较高的原位锆石8180值（千分之7.9-9.2）。这些地球化学特征表明，Monzogranite来源于高温下的地壳岩石。水源本身经历了与地表水的低温相互作用。因此，在不同温度下地壳岩石的部分熔融在决定所得花岗岩的地球化学多样性中起着重要作用。

著录项

  • 来源
    《Journal of Asian earth sciences》 |2020年第3期|104136.1-104136.21|共21页
  • 作者

  • 作者单位

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China;

    Univ Sci & Technol China Sch Earth & Space Sci CAS Key Lab Crust Mantle Mat & Environm Hefei 230026 Peoples R China|CAS Ctr Excellence Comparat Planetol Hefei 230026 Peoples R China;

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

    Granitoids; Mafic microgranular enclaves; Zircon Hf-O isotopes; West Qinling;

    机译：花岗岩镁铁质微颗粒飞地;锆石Hf-O同位素;西秦岭;

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号