北秦岭丹凤县庾家河晶质石墨矿地质 特征及找矿远景浅析

摘要

Yujiahe crystalline graphite ore deposit is located in the eastern Fengxian-Shangnan andalusite,sillimanite and graphite metallogenic belt,which belongs to the composite island arc of mixed rock zone of North Qinling orogenic belt.Several medium-sized and small graphite ore deposits (points) have been found in this metallogenic belt.The main host strata is Paleoproterozoic Erathem Qinling terrain Yanlinggou group,Guozhuang group and mesoproterozoic erathem Xiahe terrain Zhaigen petrofabric.The ore bodies are strictly controlled by the strata.Ore type consists of gneiss, schist and marble three big flaky graphite.This deposit is a regional metamorphism type crystalline graphite ore deposit.Based on the integrated study on regional metallogenic geological and geophysical characteristics of the deposit, and the analogy to the typical regional metamorphism type crystal graphite ore deposit, proposed Yujiahe crystalline graphite deposit metallogenic conditions closely associated with strata,lithology,structure and magmatism, comprehensive analysis suggested that graphite ore prospecting in this area has huge potential.%丹凤县庾家河晶质石墨矿区处于北秦岭复合岛弧杂岩带之凤县-商南红柱石矽线石石墨成矿带东段,沿该带已发现多个中、小型的石墨矿床(点).矿体主要赋矿地层为古元古界秦岭岩群雁岭沟组、郭庄组及中元古界峡河岩群寨根岩组,矿体严格受层位控制.矿石为片麻岩型、片岩型及大理岩型三类大鳞片状石墨.矿床成因属区域变质型晶质石墨矿床.本文通过区内成矿地质特征及地球物理特征进行分析,类比典型区域变质型晶质石墨矿床,提出庾家河晶质石墨矿床成矿条件主要与地层、岩性、构造、岩浆作用等关系密切,综合分析认为本区石墨矿床找矿潜力巨大.