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Occurrence and late re-equilibration of pollucite from the Koktokay no. 3 pegmatite, Altai, northwestern China

机译:Koktokay No. 1中的石灰石的发生和后期的重新平衡。伟泰3伟晶岩,中国西北

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摘要

The Koktokay no. 3 pegmatite, Altai, NW China, is a strongly zoned spodumene-subtype pegmatite. Pollucite is the unique ore mineral exploited for Cs in this pegmatite. It occurs in internal textural zones of the pegmatite in different abundances. Primary pollucite is largely homogeneous, but it displays a broad range of composition between different textural zones with CRK [=100(Cs + Rb + K)/(Na + K + Rb + Cs + Mg + Ca)] = 74–86 and Si/Al = 2.20–2.51. Four principal types of pollucite were distinguished. (1) First is pollucite with blebby mosaic texture consisting of Na-enriched and Cs-enriched phases, which clearly resulted from local exsolution of primary pollucite in the sub-solidus state. (2) The second type is nearly end-member pollucite (CRK
机译:Koktokay号。 3伟晶岩,中国西北部阿尔泰,是一种强烈的 分区锂辉石亚型伟晶岩。硅钙石是在该伟晶岩中用于Cs的独特矿石 矿物。它以不同的丰度发生在伟晶岩的内部 纹理区域。初级 凹凸棒石基本上是均匀的,但是在CRK [= 100(Cs + Rb + K )/(Na + K + Rb + Cs + Mg + Ca)] = 74-86,Si / Al = 2.20-2.51。区分了四种主要类型的钙镁矿。 (1)首先是具有 由Na富集和Cs富集的相组成的具有粗糙马赛克质地的钙铝石,这显然导致了 < / sup>来自亚固相线 状态的局部钙质的局部释放。 (2)第二种类型是近端成员的钙铝石(CRK 形成的。 (3)在平行于周围的 无定形晶体的细小脉动中观察到,辛钙石与石英缔合。从组成上讲,这种碳酸钙的CRK 比率最高为96,并且是由 富含Cs的流体代替钠长石的结果。 (4)振荡带状的绿岩是第四类,通常仅限于与小粒状孔洞接触的绿岩。分区在Cs / Na的变化方面在 上振荡,并且与局部 改变流体组成简单相关。

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  • 来源
    《American Mineralogist》 |2006年第6期|729-739|共11页
  • 作者单位

    State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China;

    State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China;

    State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China;

    UMR 5563—CNRS, Laboratoire de Mécanismes de transfert en Géologie, Université Paul Sabatier, 14, Avenue Edouard Belin, 31400 Toulouse, France;

    Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;

    UMR 5563—CNRS, Laboratoire de Mécanismes de transfert en Géologie, Université Paul Sabatier, 14, Avenue Edouard Belin, 31400 Toulouse, France;

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