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新疆拜城县波孜果尔A型花岗岩类为富含铌、钽、锆等有用元素的含矿岩体。通过偏光显微镜、电子探针(EPMA)化学成分分析、电子探针背散射(BSE)对波孜果尔A型花岗岩类的矿物学特征进行了研究,并对岩浆形成的温度条件与构造背景进行了讨论。结果表明,波孜果尔A型花岗岩类包括霓石钠闪石英碱性长石正长岩、霓石钠闪碱性长石花岗岩、黑云母碱性长石正长岩3种岩石类型。主要造岩矿物包括石英、钠长石、钾长石、霓石、钠铁闪石和铁叶云母。副矿物包括锆石、烧绿石、钍石、萤石、独居石、氟碳铈镧矿、磷钇矿等。岩浆平均温度832~839℃,形成于非造山的板内构造环境,且具高温、无水、低氧逸度的成岩特点。
Pomegranate A-type granites in Baicheng County, Xinjiang are ore-bearing rock masses rich in useful elements such as niobium, tantalum and zirconium. The mineralogical characteristics of Plutonic A-type granites were studied by polarization microscope, EPMA chemical composition analysis and electron probe backscattering (BSE). The temperature conditions and tectonic setting of magma formation Discuss. The results show that the type B granitic A-type granites include three kinds of rock types, ie, apatite amphibole-type amphibole syenite, apatite prophylactite granite and biotite alkaline feldspar granulite. The main rock-forming minerals include quartz, albite, potassium feldspar, aegirine, sodium iron amphibole and iron mica. Side minerals include zircon, pyrochlore, thorium, fluorite, monazite, bastnasite, xenotime and the like. The average magma temperature is 832 ~ 839 ℃. It is formed in the non-orogenic intraplate tectonic environment and has diagenetic characteristics of high temperature, no water and low oxygen fugacity.