• 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
新疆西天山高压变质带的变质矿物与变质作用演化
Metamorphic Minerals and Evolution of the Western Tianshan High-Pressure Low-Temperature Metamorphic Belt,Xinjiang
  
中文关键词:西天山 高压变质带 变质矿物 变质作用
英文关键词:western Tianshan  high P/T metamorphic rocks,metamorphic mineral  metamorphism
基金项目:国家自然科学基金项目(49402036、49632240)和国家三0五项目(969150301)成果 , 国家863计划资助项目 ,
作者单位
高 俊  
张立飞  
王宗秀  
艾克拜尔  
摘要点击次数: 1184
全文下载次数: 1490
中文摘要:
      新疆西天山高压变质带主要由石榴石,角闪石,绿辉石,多硅白云母,钠云母,绿帘石,绿泥石,钠长石,石英,榍石和金红石等组成,石榴石主要含铁铝榴石组份,角闪石有蓝闪石,亚铁蓝闪石,青铝闪石,冻蓝闪石等类型,变质矿物组合显示高压变质带经历了由硬柱石蓝片岩相,榴辉岩相,绿帘蓝片岩相至绿片岩相的变质作用演化进程。
英文摘要:
       The western Tianshan high-pressure low-temperature metamorphic belt in Xinjiang, extending west-east for about 200 km along the Paleozoic suture between the Yili-Central Tianshan and Tarim plates, is mainly composed of garnet, amphibole, omphacite, phengite,paragonite, epidote, chlorite, albite, quartz,sphene, ruble etc. Garnets comprise predominantly almandine componem(Alm45-72)and,next, grossular(GrO9-36),pyrOpe( Py2-24)and spessartine( Spe0-27).The garnet porphyroblasts contain zoisite, paragonite, albite, sodic amphibole, omphacite and quartz inclusions and are retrograded to chlotites along the margin. Amphibole might be classified imo three types, namely sodic amphibole(glaucophane,ferro-glaucophane, crossite, riebeckite, magnesio-riebeckite),sodic-calc maphibole(barroisite and win- chite) and talc amphibole(actinolite).The sodic amphiboles assume coarse-,medium-,fine-grained and fibrous assemblages, with the majority being fine-grained(0.1-0.5 mm)in size. A few sodic amphiboles are slightly retrograded to chlorites or actinolites.The jadeite content of omphacites in eclogues is between 39.38% and 54.14% averagly 45.48%.The cation number of Si of phengites changs from 3.31 to 3.57,averaging 3.41.The ration number of Na of paragonites changes from 0. 64 to 0. 90, 0. 85 on the average. The conditions of peak eclogue facies metamorphism are estimated to be 520士80℃and 1 .2-1 .4 GPa. The metamorphic mineral assemblages reveal that the high P/T belt has underdone a metamorphic evolution process from lawsonite-blueschist facies through eclogite facies and epidote-blueschist facies to greenschist facies.
高 俊,张立飞,王宗秀,艾克拜尔,1997,新疆西天山高压变质带的变质矿物与变质作用演化[J].岩石矿物学杂志,16(3):244~254.
查看全文  查看/发表评论  下载PDF阅读器
关闭
您是本站第 5700073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