CAJ | 학술논문

在栗木矿田沟挂垒钻孔深部发现花岗岩体下部有厚度大于190m的二云母花岗岩,通过对二云母花岗岩以及上部白云母花岗岩的岩相学研究和分析对比,认为该区第二阶段的花岗岩上部为白云母花岗岩,在深部相变为二云母花岗岩,岩体中、上部的白云母花岗岩相主要是二云母花岗岩不同程度蚀变交代形成的,而不是岩浆就地重力分离结晶形成的,其蚀变程度相当于该区含矿花岗岩体矿化蚀变带下部的钾长石化带。无斑的白云母花岗岩相在钾长石化带中蚀变最强,最靠近主矿化蚀变带,有重要的找矿意义。各岩相的化学分析表明,W、Sn、Nb、Ta的矿化富集可能与岩浆气液分离作用或深部岩浆分异有关。
재률목광전구괘루찬공심부발현화강암체하부유후도대우190m적이운모화강암,통과대이운모화강암이급상부백운모화강암적암상학연구화분석대비,인위해구제이계단적화강암상부위백운모화강암,재심부상변위이운모화강암,암체중、상부적백운모화강암상주요시이운모화강암불동정도식변교대형성적,이불시암장취지중력분리결정형성적,기식변정도상당우해구함광화강암체광화식변대하부적갑장석화대。무반적백운모화강암상재갑장석화대중식변최강,최고근주광화식변대,유중요적조광의의。각암상적화학분석표명,W、Sn、Nb、Ta적광화부집가능여암장기액분리작용혹심부암장분이유관。
Binary granite,which has a thickness of more than 190m,has been found at depth in Gougualei of Limu ore-field lately by bore hole survey.Base on the petrographic analysis and comparative analysis of binary granite and upper muscovite granite,this paper believes that the upper part of the granite of second phase is muscovite granite which turns to be binary granite at depth through phase transition.The muscovite granite in the upper and middle part of the rock body is mainly formed by binary granite through alteration and replacement but is not formed by gravitational separation crystallization.Its grade of alteration is as the same as that of K-feldspathization zone which locates at the lower part of mineralization alteration zone of mineralbearing granite mass in this area.The alteration of lithofacies of Nonporphyritic muscovite granite is the strongest among K-feldspathization zone and its location is the nearest to main mineralization alteration zone. The prospecting potential is great.The chemical analysis on various lithofacies suggests that the concentrated mineralization of W,Sn,Nb and Ta may be related to magmatic liquid-gas separation or magma splitting at depth.