CAJ | 학술논문

位于西秦岭礼(县)-岷(县)成矿带西段的寨上金矿床,是近年发现的一个大型微细浸染型金矿床.矿床赋存于中泥盆统和下二叠统,为一套由石英砂岩、粉砂岩、钙质板岩和灰岩组成的浊积岩建造.金矿体明显受断裂构造的控制.矿石中矿物组成相当丰富,既有大量硫化物、硫盐、氧化物、硫酸盐、碳酸盐、钨酸盐,又有碲化物、自然金属及多金属互化物.矿石中矿物种类较多、组成较复杂以及存在显微自然金,是寨上金矿床的特色.稀土元素配分型式以及硫、铅、碳、氧、氢等同位素组成等表明,成矿金属物质、硫和碳主要来自赋矿岩石和下伏地层,同时还有深部岩浆物质的参与.成矿溶液主要来自加热的循环地下水.矿化和蚀变作用是在水/岩比值较低的体系中进行的.成矿温度主要集中在120～240℃范围内.赋矿围岩中含Fe碳酸盐矿物溶解释放Fe以及溶解Fe的大量硫化物化,是寨上金矿床中存在显微可见自然金的最重要因素和金沉淀富集的有利条件.
위우서진령례(현)-민(현)성광대서단적채상금광상,시근년발현적일개대형미세침염형금광상.광상부존우중니분통화하이첩통,위일투유석영사암、분사암、개질판암화회암조성적탁적암건조.금광체명현수단렬구조적공제.광석중광물조성상당봉부,기유대량류화물、류염、양화물、류산염、탄산염、오산염,우유제화물、자연금속급다금속호화물.광석중광물충류교다、조성교복잡이급존재현미자연금,시채상금광상적특색.희토원소배분형식이급류、연、탄、양、경등동위소조성등표명,성광금속물질、류화탄주요래자부광암석화하복지층,동시환유심부암장물질적삼여.성광용액주요래자가열적순배지하수.광화화식변작용시재수/암비치교저적체계중진행적.성광온도주요집중재120～240℃범위내.부광위암중함Fe탄산염광물용해석방Fe이급용해Fe적대량류화물화,시채상금광상중존재현미가견자연금적최중요인소화금침정부집적유리조건.
Located in the western part of the Min-Li metallogenic belt within the West Qinling Mountains, the Zhaishang gold deposit is a large Carlin-type disseminated gold deposit discovered in recent years. The ore deposit occurs in the slightly metamorphosed Middle Devonian and Lower Permian clastic and carbonate strata composed of quartz sandstone, siltstone, calcareous slate and carbonate that comprise flyschoid formation. Gold mineralization is strictly controlled by a fault zone. Ore minerals are quite complex and consist of sulfides, sulfosalt, oxides, sulfate, carbonate, tungstate, telluride, native metals, and polymetallic intermetallic compounds. The di-versity of mineral species in the ores and the existence of visible native gold minerals constitute outstanding features of the ore deposit.In the light of the REE distribution pattems, it is reasonably considered that the ore-forming materials of the ore deposit had affinity mainly with host rocks. S, C, Pb, H and O isotopic compositions show that the ore-forming materials were derived mainly from country rocks and underlying rocks and partly from deeper sources. Data obtained suggest that the ore-forming fluids were derived predominantly from an active meteoric groundwater system. The amount of the hydrothermal fluids in the ore-formaing and alteration system was relatively insignificant. Ore-forming temperatures are estimated to have been in the range of 120～240℃. The dissolution of ferruginous limestone in the host rocks and the sulfidation of the dissolved iron by H_2S introduced by ore fluids constituted not only the most important depositional mechanism for the existence of visible gold grains but also the advantageous conditions for gold enrich-ment in the Zhaishang gold deposit.