铁白云石矿物学特征及原生次生成因机制  

Mineralogical Characteristics of Ankerite and Mechanisms of Primary and Secondary Origins

作　　者：由雪莲[1] 贾文强 徐帆 刘仪 You Xuelian;Jia Wenqiang;Xu Fan;Liu Yi(School of Ocean Sciences,China University of Geosciences,Beijing 100083,China;School of Energy Resources,China University of Geosciences,Beijing 100083,China)

机构地区：[1]中国地质大学海洋学院,北京100083 [2]中国地质大学能源学院,北京100083

出　　处：《地球科学》2018年第11期4046-4055,共10页Earth Science

基　　金：国家自然科学基金青年基金项目(No.41402102);中央高校基本科研业务费(No.2652017132)

摘　　要：长期以来,铁白云石的命名划分标准混乱,一直被当成高温及次生的产物.综述了国内外铁白云石的研究进展,详细探讨了铁白云石的矿物学特征,特别在其成因中加入了微生物因素,运用地质微生物学探讨原生铁白云石的成因机制.研究认为:(1)铁白云石命名划分依据应遵照国际矿物学会的原则,以铁是否替代白云石晶格中半数镁的位置为标准,分为白云石和铁白云石;(2)详述铁白云石矿物学及其晶体特征;(3)铁白云石成因分为原生沉淀及次生两种,微生物介导形成原生白云石的过程中,有助于铁进入到白云石晶格中,增加晶格中铁的含量.The compositional break between ferroan dolomite and ankerite has not been well-defined for a long time. Ankerite has always been regarded as a secondary mineral generated at high temperatures. In this paper, progress in mineralogy and origins of ankerite and a link between microbial activity and ankerite are evaluated. Based on documented data： （1） The composi tional break based on the ＂50% rule＂ principle from International Association of Mineralogy is applied for Ca-Mg-Fe carbonate. Any minerals with more than 50 mol% Fe in the Mg site would be called ankerite; （2） Progresses in mineralogical and lattice characteristics of ankerite are presented; （3） The origins of ankerite are primary and secondary. In the process of microbial mediated primary dolomite, microbe facilitates iron into the dolomite lattice and increases the iron content in the Mg site in its structure. Microbes could be added into the primary sedimentary experiments to promote mediation of the primary ankerite.

关 键 词：铁白云石 原生铁白云石 微生物成因 矿物学 

分 类 号：P588.24[天文地球—岩石学]