哈密东戈壁钼矿成矿特征及围岩蚀变

GEOLOGICAL AND WALL-ROCK ALTERATION CHARACTERS OF DONGGEBI DEPOSIT,HAMI CITY

东戈壁钼矿赋存于东天山造山带内,属斑岩型钼矿床.矿体形态受岩体形态、大小、围岩物理性质和次级裂隙发育程度控制.矿化对围岩无选择性,与多期次构造活动所形成的次级裂隙密集程度有关.蚀变演化划分为5个阶段,辉钼矿-石英脉阶段是蚀变、矿化最强烈阶段,也是钼主成矿期.含矿热液在迁移过程中,与围岩发生强烈流体-岩石反应,造成金属元素含量增加和钼富集.研究矿床地质特征和围岩蚀变与钼矿化时空关系,对在东天山寻找同类型矿床具重要指导意义.

The Donggebi Molybdenum deposit in the East Tianshan Orogenic Belt belongs to porphyry type.The shape of orebodies is restricted to the shape,size and rockbody,physical nature of surrounding rocks and growth degree of sub-fracture.The mineralization has no choice of surrounding rocks,which is related to sub-fracture density formed by more periodical structure activities.The Mo mineralization is related to surrounding rocks alteration.Evolution of the alteration may be divided into five stages,of which mineralization-alteration stage of molybdenite-quartz is the principal mineralization period.During fluid-rock interaction,the performing components were not equally mobile,resulting the increasing of Metals and enrichment of Molybdenum.Furthermore,according to researching the geological and wall-rock alteration characters of Donggebi deposit,it can also provide referential method for searching the similar minerals m the East Tianshan Orogenic Belt.