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滇西大理—剑川地区钾玄质岩浆作用:后碰撞走滑拉伸环境岛弧型岩浆作用的地球化学研究
引用本文:王建,李建平,等.滇西大理—剑川地区钾玄质岩浆作用:后碰撞走滑拉伸环境岛弧型岩浆作用的地球化学研究[J].岩石学报,2003,19(1):61-70.
作者姓名:王建  李建平
作者单位:中国科学院广州地球化学研究所,广州,510640
基金项目:国家重点基础研究发展规划项目(G1998040800),南海及邻区大地构造系统的组成、结构及演化项目(KZCX-SW-117)
摘    要:岩石学、元素地球化学研究表明,在滇西大理-剑川地区分布的富碱斑岩群属钾玄质系列岩石,具有产出于与红河-哀牢山走滑剪切带伴生的早第三纪拉张盆地中,这套钾玄质系列岩石富集大离子亲石元素LILE(Rb,Ba,K,Sr),轻稀土元素(LREE)和一组相容元素(Cr,Ni,V,Sc),具有明显的Nb,Ta,Ti,P负异常,反映了后碰撞岛弧型钾玄岩系特征。钾玄质母岩浆主要源于含金云母的尖晶石相地幔橄榄岩低度部分熔融,并在演化过程中经历了充分的分离结晶作用。

关 键 词:钾玄质岩石  元素地球化学  拉伸盆地  弧型岩浆活动  云南  火山岩  后碰撞岛弧构造环境
文章编号:1000-0569/2003/019(01)-0061-70
修稿时间:1/3/2002 12:00:00 AM

Shoshonitic magmatism in Dali-Jianchuan area, western Yunnan: a geochemical study of arc magmatism in a post-collisional strike-slip extensional setting.
WANG Jian,LI JianPing and WANG JiangHai Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,China.Shoshonitic magmatism in Dali-Jianchuan area, western Yunnan: a geochemical study of arc magmatism in a post-collisional strike-slip extensional setting.[J].Acta Petrologica Sinica,2003,19(1):61-70.
Authors:WANG Jian  LI JianPing and WANG JiangHai Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou  China
Abstract:Studies of petrology and elemental geochemistry indicate that the alkali-rich prophyry groups from the area of Dali-Jianchuan in western Yunnan are shoshonitic rocks, which are located in the early Tertiary extensional basins associated with Honghe-Ailaoshan strike-slip shear zone. This suite of shoshonitic rocks are enriched in LILE ( Rb, Ba, K, Sr ), LREE and a group of compatible elements (Cr, Ni, V, Sc), and have marked Nb, Ta ,Ti and P depletion, similar to the characteristics of post-collisional arc-type shoshonitic rocks. The shoshonitic parental magma was mainly derived from the low degree partial melting of phlogopite-bearing spinel phase mantle peridotites and had experienced abundant fractional crystallization during its evolution.
Keywords:Shoshonitic rocks  Elemental geochemistry  Post-collision  Extensional basin  Arc-type magmatism  Western Yunnan
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