天然气地球科学 ›› 2004, Vol. 15 ›› Issue (1): 20–27.doi: 10.11764/j.issn.1672-1926.2004.01.20

• 非烃气体 • 上一篇    下一篇

松辽盆地东北缘孙家窑地区碳酸盐岩接触变质带元素分配关系和CO2定量释放

李振生1,刘德良1,杨晓勇1,谈 迎1,杨 强1,王伯长2,郑德山2,王凤来2,孙占强2   

  1. (1.中国科学技术大学地球与空间科学学院,安徽 合肥 230026;2.大庆油田有限责任公司,黑龙江 大庆 163453)
  • 收稿日期:2003-07-30 修回日期:2003-10-08 出版日期:2004-02-20 发布日期:2004-02-20
  • 通讯作者: 李振生
  • 作者简介:李振生(1976-),男,河北遵化人,博士,主要从事构造地球化学研究.
  • 基金资助:

    国家重点基础研究发展规划项目(编号:2001CB209132),国家自然科学基 金重大项目(编号:49794044)资助.

THE ELEMENT DISTRIBTUING RELATION AND THE ABILITY OF CO2 RELEASED OF CARBONATE CO NTACT METAMORPHIC BELTS IN SUNJIAYAO AREA, THE NORTHEAST EDGE OF THE SONGLIAO B ASIN

LI Zhen-sheng1, LIU De-liang1, YANG Xiao- yong1, TAN Ying1, YANG Qiang1, WANG Bai-chang2, ZHEN D e-shan2, WANG Feng-lai2, SUN Zhan-qaing2   

  1. (1.University of  Science and Technology of China, Hefei 230026, China;2.Daqing Oilfield Compan y Limited, Daqing 163453, China)
  • Received:2003-07-30 Revised:2003-10-08 Online:2004-02-20 Published:2004-02-20

摘要:

为了定量分析碳酸盐岩接触变质作用形成的CO2,研究了松辽盆地东北缘碳酸盐岩接触变质带常量元素和稀土元素的元素分配关系。认为碳酸盐岩接触变质过程中主要体现为硅的富集和钙、碳的亏损,并且CaO、SiO2与ΣREE呈线性关系;随着变质程度增高,元素的含量、稀土元素的分布型式和分馏程度越趋向花岗岩,其主要原因是碳酸盐岩与侵入流体的混染作用、碳酸盐岩硅化及矿化过程引起的稀土变化、碳酸盐岩重结晶对轻稀土元素的富集。计算得出了CO2释放量与岩石体积比(2.7~256.7)。证明了碳酸盐岩接触变质作用是无机成因CO2形成的机制。

关键词: 接触变质作用, 碳酸盐岩, 递进变质反应式, 元素迁移

Abstract:

To provide quantitative evidence, that dioxide carbon is re leased in carbonate contact metamorphism, the distributing relation of main and  rare earth elements and the quantity of CO2 released in carbonate contact  metamorphic belts are researched in the northeast edge of Songliao basin. The mo st characters are the enrichment of silicon and the loss of carbon and calcium,  and there is a linear relation among CaO, SiO2 and ΣREE. The element cont ent and the REE pattern more tend to that of granite with the metamorphic degree  deeper. The reasons, which cause those, are mixture of carbonate and fluid, the  variety of REE in silification and mineralization of carbonate and the enrichme nt of light REE in carbonate recrystallization. The volume ratio of the amount o f dioxide carbon released and the rock is from 2.7 to 256.7, which prove that in organic CO2, which is released in carbonate contact metamorphism, is a pot ent gas source.

Key words: Contact metamorphism, Carbonatite, Prograde mineral reaction equations, Element migration.

中图分类号: 

  • P588.31

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