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多硅白云母地质压力计的热力学模拟 被引量:7

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摘要 利用THERMOCALC323程序,以及最新的矿物固溶体模型,模拟了相当于平均、富铝和富钾3种泥质岩石在KFMASH(K2O-FeO-MgO-Al2O3-SiO2-H2O)体系中的P-T视剖面图和多硅白云母硅等值线,发现后者与矿物组合有关.在含有绿泥石或黑云母的双变、三变域以及含有石榴石-蓝晶石的三变域中,多硅白云母可以作为很好的地质压力计.但在含有纤柱石而无绿泥石的组合中,多硅白云母的硅等值线主要指示温度变化.对相同的硅含量来说,当多硅白云母与蓝晶石共生时指示压力较高,与钾长石共生时指示压力较低.在KFMASH体系中加入Na2O,会引起AFM矿物相稳定域缩小.在只含有一个含钠矿物相的矿物组合中,NKFMASH体系下多硅白云母硅含量等值线的行为,与KFMASH体系相似;在含有两个或者两个以上的含钠矿物相组合中,两个体系的多硅白云母硅含量等值线行为相差较大.
出处 《中国科学(D辑)》 CSCD 北大核心 2007年第8期1014-1019,共6页 Science in China(Series D)
基金 国家自然科学基金项目资助(批准号:40372032 40525006)
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