• 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
从岛弧向裂谷的变迁—来自阿吾拉勒地区火山岩的证据
The Change from Island Arc to Rift Valley-Evidence from volcanic Rocks in Awulale Area
  
中文关键词:火山岩 地球化学 岛弧 裂谷
英文关键词:Volcanic rock  geochemistry  island arc riftvalley
基金项目:
作者单位
姜常义  
吴文奎  
张学仁  
崔尚森  
摘要点击次数: 2262
全文下载次数: 1107
中文摘要:
      阿吾拉勒地区早、中石炭世火山岩以碱性系列为主,少部分属钙碱性系列;稀土元素具有岛弧和活动陆缘区橄榄安粗岩和高钾安山岩的特征:微量元素具有大陆型岛弧火山岩的特征。由此证明本区在早、中石炭世处于内弧环境。二叠纪火山岩属碱性系列;稀土元素和微量元素明显有板内碱性玄武岩的特征。其岩石组合与肯尼亚裂谷相似,处于裂谷演化的早期阶段.晚石炭世的博格达运动导致本区从岛弧向裂谷变迁。
英文摘要:
      The Early and Middle Carboniferous volcanic rocks in Awulale area are mainly of alkaline series, with a small part belonging to calc-alkahne series;rare earth elements show cliaracteristics of kohalaite and K-high andesite in the island arc and active epicontinental region; trace elements exhibit features of continental island arc volcanic rocks,It is thtis proved that this area was in an intra- arc environment in Early and Middle Carboniferous. Permian vol-canic rocks are of alkaline series: rare earth eiements and trace elements mani-fest features of intra-plate alkaline basalt.The rock assemblage resembles that of Kenya rift valley, being at the early stage in valley evolution. The Late Carboniferous Begeda tectonic movement led to the change of this area from island arc to rift valley and also to the tranformation of Tianshan Mountains from plate framework to intraplate framework.
姜常义,吴文奎,张学仁,崔尚森,1995,从岛弧向裂谷的变迁—来自阿吾拉勒地区火山岩的证据[J].岩石矿物学杂志,14(4):289~300.
查看全文  查看/发表评论  下载PDF阅读器
关闭
您是本站第 3713768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