欢迎访问现代地质!

现代地质 ›› 2007, Vol. 21 ›› Issue (2): 307-317.

• 岩浆作用与岩浆岩 • 上一篇    下一篇

甘肃西秦岭新生代钾霞橄黄长岩中的球状分凝体及地幔流体反演

王永磊,喻学惠, 韦玉芳,朱德勤   

  1. 1中国地质科学院 矿产资源研究所,北京100037;2中国地质大学 地质过程与矿产资源国家重点实验室,北京100083
  • 收稿日期:2007-02-28 修回日期:2007-05-05 出版日期:2007-02-20 发布日期:2007-02-20
  • 作者简介:喻学惠,女,教授,博士生导师,1944年出生,岩石学专业,主要从事火成岩及有关矿产的研究工作。 Email:xhyu@cugb.edu.cn。
  • 基金资助:

    国家自然科学基金面上项目(40572046);国家重点基础研究项目(2002CB412600)

The Globule Segregations in the Cenozoic Kamafugite and An Inversionof Mantle Fluid, Western Qinling, Gansu Province

WANG Yong-lei1,2, YU Xue-hui2, WEI Yu-fang2,  ZHU De-qin2   

  1. 1Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing100037, China;
    2State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China
  • Received:2007-02-28 Revised:2007-05-05 Online:2007-02-20 Published:2007-02-20

摘要:

地幔流体在地质过程中的作用日益受到人们的重视,成为地球科学研究的一个前缘课题。提供了甘肃西秦岭新生代钾霞橄黄长岩中各种形态分凝体详细的岩相学、矿物学和矿物化学的资料,对分凝体的性质、深部地幔流体的成分及成因机制进行了讨论。研究表明,钾霞橄黄长岩中分凝体是软流圈地幔流体活动的记录,其成因机制与岩浆作用对软流圈的开放和软流圈上涌的条件下,原生钾霞橄黄长岩浆的分异作用(特别是液态不混熔作用),以及岩浆的抽提作用、动态熔融作用等综合作用有关。

关键词: 球状分凝体, 钾霞橄黄长岩, 新生代, 地幔流体, 西秦岭

Abstract:

The significances of the mantle fluid in geological processes have received  more attention day by day, and became a frontier project in geosciences. This paper provides detailed petrographic, mineralogic and mineralchemical data of the   segregation with various forms in kamafugites from Western Qinling, Gansu Province, and probes into the nature of these segregations, the composition of the mantle fluid and generating mechanism of these  segregations. The studies show that these  segregations are records of the activities of asthenospheric  mantle fluid. The generating mechanism of the  segregation may be related to differentiation of the primary kamafugite magma(especially liquid immiscibility), combined with magma extraction and dynamic melting at the conditions of  the magmatism opened to  asthenosphere and  the upwelling of the asthenosphere.

Key words: globule segregation, kamafugite, Cenozoic, mantle fluid, Western Qinling

中图分类号: