CAJ | 학술논문

秦岭金矿分布广,目前学术界大多认为分属于造山型和卡林型金矿两类.该区印支期花岗岩发育,大多具有埃达克岩和喜马拉雅型花岗岩(低Sr和Yb)的特点,与金铜矿在时空分布上相关.美国内华达州卡林型金矿是世界级的金矿聚集区.与卡林型金矿有关的第三纪岩浆岩(中酸性火山岩和浅成花岗岩)也具有埃达克岩和喜马拉雅型花岗岩的地球化学特征,暗示内华达卡林型金矿也来源于加厚下地壳的底部.本文讨论了埃达克岩和喜马拉雅型花岗岩有利于成矿的机理,并根据西秦岭金矿与花岗岩分布的关系,提出以夏河-宕昌-两当-凤县为界将西秦岭划分为南北两个成矿区和13个成矿聚集区:北区花岗岩发育,有利于寻找斑岩型、夕卡岩型等热液型金铜矿床;南带侵入岩少而小,有利于寻找远离岩体的金矿(包括卡林型等).鉴于西秦岭印支期埃迭克岩和喜马拉雅型花岗岩发育,金铜尤其是金矿分布多,储量大,且大多与埃达克岩或喜马拉雅型花岗岩有关,可能是中国金矿最具潜力的地区,有利于特大型金铜矿的产出,可能发展成为中国最大的金矿聚集区.为此,建议加强本区花岗岩与金铜成矿关系的研究,革新找矿思路和找矿技术方法,以实现找矿的新突破.
진령금광분포엄,목전학술계대다인위분속우조산형화잡림형금광량류.해구인지기화강암발육,대다구유애체극암화희마랍아형화강암(저Sr화Yb)적특점,여금동광재시공분포상상관.미국내화체주잡림형금광시세계급적금광취집구.여잡림형금광유관적제삼기암장암(중산성화산암화천성화강암)야구유애체극암화희마랍아형화강암적지구화학특정,암시내화체잡림형금광야래원우가후하지각적저부.본문토론료애체극암화희마랍아형화강암유리우성광적궤리,병근거서진령금광여화강암분포적관계,제출이하하-탕창-량당-봉현위계장서진령화분위남북량개성광구화13개성광취집구:북구화강암발육,유리우심조반암형、석잡암형등열액형금동광상;남대침입암소이소,유리우심조원리암체적금광(포괄잡림형등).감우서진령인지기애질극암화희마랍아형화강암발육,금동우기시금광분포다,저량대,차대다여애체극암혹희마랍아형화강암유관,가능시중국금광최구잠력적지구,유리우특대형금동광적산출,가능발전성위중국최대적금광취집구.위차,건의가강본구화강암여금동성광관계적연구,혁신조광사로화조광기술방법,이실현조광적신돌파.
Gold deposits spreading extensively in west Qinling have been grouped into such two types as orogenic type and Carlin type, which is accepted by most researchers of the present academic field. In the study area developed Indo-chinese epoch granite, most of which have the characteristics of adakite and Himalayan type granite (relatively low content of Sr and Yb), and related to distribution of gold and copper deposits spatially and timely. The study on Carlin type gold deposits in Nevada, USA show that it is a world-level concentration area of gold deposit, Tertiary igneous rock (intermediate-acid rock and hypabyssal granite) related to gold and copper deposits have the geochemical characteristics of adakite and Himalayan type granite which indicate that the sources of Carlin type gold deposit in Nevada come from the bottom of thickened lower crust. In the paper the metallogenetic mechanism of adakite and Himalayan type granite was discussed, west Qinling was divided into two metallogenetic regions as north and south with the boundary of Xiahe-Tanchang-Liangdang-Fengxian, including 13 metallogenetic concentration areas. In the north region, the developed granite is favorable to search porphyry type, skarn type and hydrothermal type gold and copper deposit; in the south region, it is good to search gold deposits away from igneous rock mass (including Carlin type, sedimentary type, rupture zone type and altered rock type, etc.). West Qinling where Indo-chinese adakite and Himalayan type granite developed extensively, most gold and copper deposits with the features of wide distribution and high reserves are related to adakite and Himalayan type granite should be developed the most potential gold region.