• 首页|本刊简介|在线投稿|过刊浏览|高级检索|专家风采|学习园地|期刊论坛|联系我们
中国东部燕山期岩浆活动的几个问题
A Discussion on the Yanshanian Magmatism in Eastern China
  
中文关键词:中国东部 燕山期 岩浆活动 花岗岩 形成环境 源区深度 底侵作用 拆沉作用
英文关键词:eastern China,Yanshanian magmatism,granite,tectonic setting,source depth
基金项目:中国科学院知识创新工程基金资助项目(KZCX1-07);国家“973”资助项目(G1999043206-05)
作者单位
张 旗  
赵太平  
王 焰  
王元龙  
摘要点击次数: 1990
全文下载次数: 1289
中文摘要:
      中国东部中酸性燕山期岩浆活动非常发育。文中讨论了中国东部燕山期岩浆岩的分区、岩浆系列、埃达克质岩(adakite-like)、花岗岩源区、花岗岩形成环境、I型和S型花岗岩的含义等问题。认为目前使用的花岗岩判别图不能用来讨论花岗岩形成的构造环境,按照花岗岩源区深度,至少可以分出来自地幔下地壳和中上地壳的3个深度层次的花岗岩类,强调源区深度对花岗岩性质的制约。认为中国东部燕山期大规模岩浆活动可能与地壳拉张环境下大规模拆沉作用导致的软流圈地幔上涌及其引发的玄武岩底侵作用有关,而与古太平洋板块的俯冲作用无关,中国东部不属于环太平洋构造-岩浆带。但拆沉作用发生的时间、原因和机制仍然不清楚。
英文摘要:
      Igneous series and distribution of the widespread Yanshanian magmatism, adakite, signification of I- and S-type granite, and the sources, tectonic settings and heat mechanism of granites are discussed in this paper. It is proposed that the tectonomagmatic discrimination diagrams, such as the diagram by Pearce et al . (1984), should be used with caution in distinguishing tectonic settings of granites. The depth of the source is considered to be the most important factor responsible for controlling the nature of granitoid rocks. Acording to the source depth, the authors have classified the granites into three types, viz., mantle-derived, lower-crust-derived, and middle-upper-crust-derived granites. The Yanshanian magmatism in eastern China resulted probably from underplated basaltic magmas generated from upwelling asthenospheric mantle in a continental crust extensional setting, and had nothing to do with the westward subduction of the Paleo-Pacific (or Izanagi) plate. Therefore, the Yanshanian magmatic rocks in eastern China do not belong to the circum-Pacific tectonic-magmatic belt. The reason, time and mechanism of delamination, however, need further detailed studies.
张 旗,赵太平,王 焰,王元龙,2001,中国东部燕山期岩浆活动的几个问题[J].岩石矿物学杂志,20(3):273~280.
查看全文  查看/发表评论  下载PDF阅读器
关闭
您是本站第 5263043位访问者  京ICP备05032737号-8
版权所有:《岩石矿物学杂志》编辑部
主管:中国科学技术协会 主办:中国地质学会岩石学专业委员会 中国地质学会矿物学专业委员会 中国地质科学院地质研究所
技术支持:北京勤云科技发展有限公司

京公网安备 11010202007772号