吉林省龙井市金谷山金矿床成矿地质特征及成因探讨

GEOLOGICAL FEATURES AND ORIGIN OF THE JINGUSHAN GOLD DEPOSIT IN LONGJING CITY, JILIN PROVINCE

龙井市金谷山金矿床是近几年在延边地区新发现的中大型金矿床。矿体赋存于二叠系浊积岩系中 ,其形成受原始含矿岩系、不同岩性界面、断裂构造、褶皱构造和热液叠加改造等多种地质条件控制。一系列矿体产出特征表明其属于微细浸染型金矿 ,与穆龙套型金矿相似。微量元素、稳定同位素等反映出该矿床具有层控深源流体改造型成因特征。

The Jingushan gold deposit is a new explored middle-large deposit in Yanbian district. The deposit is occurred in the Permian turbidite formation and controlled by some geological conditions, such as original ore-bearing formation, boundary plane of different strata, folded and faulted structures, and hydrothermal solution superimposition. A series of the occurrence feature of deposit indicate that the deposit belongs to micro-disseminated gold deposit which is similar to the Muluntau type. The evidences of minor element and stable isotope show that the deposit has origin features of stratabound, deep resource of ore-forming fluid, and reformed type. This type of deposit and its prospecting guide have practical significance for search this type of new deposit in this area.