【摘要】 经野外调研和室内研究发现,位于商州市大荆镇北的清岩沟镍-钼矿床赋存于庙湾组下部黑色岩系中,岩系由绢云斜长石英千枚岩、黑云斑点状二云母千枚岩、石墨化绢云千枚岩、白云母细晶大理岩-碳质白云岩、含石墨石英透辉透闪岩、含钛方解-石英片岩等组成,含Mo、Ni、Ti、Cu、Pb、Zn、P及碳质高。宏观及微观地质特征表明,岩石经历了区域变质变形、后期强烈韧-脆性剪切构造作用叠加、改造。正是这种地质过程导致Mo、Ni等成矿元素在沉积期形成之后,发生迁移、沉淀,形成硫化物型镍、钼矿化,矿(化)体就位于岩系强烈揉皱与膨大的片理化带、赋存于强变形的刚性与塑性构造体接触带。研究表明区内的岩脉与矿化关系不明显。最后认为,清岩沟镍-钼矿床为黑色岩系容矿的层控型沉积-变质叠加-韧脆性构造改造的后生热液成因矿床。更多还原

【Abstract】 Field investigations and researches suggest that the Qingyangou Ni-Mo deposit hosts in the black rock series at the lower section of the Miaowan formation,which is made up of sericite,plagioclase quartz phyllite,maculose biotite two-mica phyllite,graphitlized sericite phyllite,muscovite fine crystalline marble-carbonceous dolomite,graphite-quartz-diopside-tremolite rock and clalcite quartz schist.The contents of Mo,Ni、,Ti,Cu,Pb,Zn,P and TOC are high in these rocks.Macroscopic and microscopic geological characteristics show the rocks have experienced regional metamorphism,and the shear tectonic process of brittle-ductile superposition and transformation in the later period.Because of this process,Mo and Ni have been migrated deposited after their formation.Finally,they are hosted in the schistosity zone or the contact between ductile bodies and rigid bodies,which has undergone intense tectonic deformation.Studies show that the relationship between veins and mineralization in the deposit area is not obvious.Thus we consider that this deposit is a sedimentary-metamorphic-structural-hydrothermal-reformation type Ni-Mo deposit.更多还原