CAJ | 학술논문

以区域成矿理论为基础,将东秦岭构造带划分为华北古陆南缘、北秦岭造山带、南秦岭造山带和扬子古陆等4个构造单元,其间商丹缝合断裂带分割南北秦岭造山带,形成华南古陆和华北古陆的分界,区内断裂构造及燕山期岩浆岩发育.研究区位于台地边缘,具有基底和盖层二元台地沉积结构,基底太古宇太华岩群变质岩和盖层熊耳群火山岩及燕山期岩浆岩构成区内重要的矿源岩.根据东秦岭地区的地球化学特征分析,矿源岩的基本特征是亏损铜,而钨和钼、铅和锌、金和银则分别在不同的物源岩中富集.研究区内矿产资源丰富,以热液成因钼、金多金属矿床为主,根据成矿流体成因及其与地质作用的关系,划分为3个成矿系统,即岩浆热液作用成矿系统、火山热液作用成矿系统及构造热液作用成矿系统,其分别与燕山期岩浆热液、熊耳期火山热液及中生代构造热液活动有关.根据燕山期岩浆岩、熊耳期火山机构及中生代的区域构造性质,分别预测了研究区内重点成矿区域.
이구역성광이론위기출,장동진령구조대화분위화북고륙남연、북진령조산대、남진령조산대화양자고륙등4개구조단원,기간상단봉합단렬대분할남북진령조산대,형성화남고륙화화북고륙적분계,구내단렬구조급연산기암장암발육.연구구위우태지변연,구유기저화개층이원태지침적결구,기저태고우태화암군변질암화개층웅이군화산암급연산기암장암구성구내중요적광원암.근거동진령지구적지구화학특정분석,광원암적기본특정시우손동,이오화목、연화자、금화은칙분별재불동적물원암중부집.연구구내광산자원봉부,이열액성인목、금다금속광상위주,근거성광류체성인급기여지질작용적관계,화분위3개성광계통,즉암장열액작용성광계통、화산열액작용성광계통급구조열액작용성광계통,기분별여연산기암장열액、웅이기화산열액급중생대구조열액활동유관.근거연산기암장암、웅이기화산궤구급중생대적구역구조성질,분별예측료연구구내중점성광구역.
According to regional metallogenic theory, East Qinling structural belt can be divided into the southern margin of North China paleo-continent, orogenic belts of North Qinling and South Qinling, and the fourth tectonic unit of the Yangtze paleo-continent. The South and North Qinling orogenic belts are bound by the Shangdan suture-fault zone, forming the boundary of North China paleo-continent and South China paleo-continent. Fractures and Yanshanian magmatic rocks are well developed within the East Qinling structural belt. The study area is located at the margin of the block, with dual mesa sedimentary structure composed of basement and cap-rocks. The basement consists of Archean magmatic rocks, which constitutes ore source rocks in this area. Ore source rocks are characterized by depletion in Cu and enrichment in W, Mo, Zn, Pb, Au and Ag in the cap-rocks. Mineral resources are rich in this area, and dominated by hyrdothermal genetic Mo-Au polymetallic deposits. Based on the genesis of ore-forming fluid and other geological actions, three metallogenic systems are classified, including magmatic hydrothermal metallogenic Mo-Au polymetallic deposits, volcanic hydrothermal metallogenic system and tectonic hydrothermal metallogenic system. They are correspondingly related to early Yanshannian tectonic hydrothermal activities. Meanwhile, the key metallogenic areas within the study area are predicted based on the analysis of regional tectonic natures of the three tectonic activities.