京西羊屎沟地区红柱石成因矿物学研究

发布时间：2018-02-11 20:20

  本文关键词： 红柱石 矿物组合 成因 接触热变质　出处：《矿物学报》2017年Z1期 　论文类型：期刊论文

【摘要】：采用偏光显微镜、傅里叶红外光谱分析和X射线荧光光谱等手段对北京西山羊屎沟地区红柱石矿物学特征以及成因进行相关分析。研究发现,该区红柱石主要呈4种矿物组合存在于含矿岩石中:(1)红柱石组合;(2)黑云母-红柱石组合;(3)白云母/绢云母-红柱石组合;(4)石榴子石-红柱石组合,表明岩石变质程度由低到高变化。红柱石横截面发育"X"型裂理和环带状显微变形构造,反映了红柱石的结晶形成是与构造变形同期进行的。该区红柱石形成是房山岩体侵入过程中,富硅的碱性流体侵入泥质围岩发生物质交换和反应形成的,形成温度在500~550℃之间,压力500MPa。
[Abstract]:The mineralogical characteristics and genesis of andalusite in Yangshigou area, Xishan, Beijing, were studied by means of polarizing microscope, Fourier transform infrared spectroscopy and X-ray fluorescence spectroscopy. The andalusite is mainly composed of 4 mineral assemblages in the ore-bearing rocks, including: (1) andalusite assemblage (2) biotite andalusite assemblage (Guan3)) Muscovite / sericite andalusite assemblage No. 4) pomegranate andalusite assemblage. This indicates that the metamorphic degree of rocks varies from low to high. The andalusite cross section is characterized by "X" type cleavage and annular microdeformed structure. The results show that the crystallization of andalusite occurred at the same time as tectonic deformation. The formation of andalusite in this area occurred during the Fangshan intrusive process, and the silicon-rich alkaline fluid intruded into the muddy surrounding rock to form material exchange and reaction, and the formation temperature was between 500 鈩，

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