金龙山—丘岭金矿床成矿流体的储运规律及区域找金方向

THE ORE FLUID TRANSPORTATION AND STORAGE REGULARITY OF JINLONGSHAN-QIULING GOLD DEPOSIT AND THE REGIONAL ORE-SEARCHING DIRECTION

金龙山—丘岭金矿区含金矿源层为上泥盆统南羊山组和下石炭统袁家沟组。组成含金矿源层岩石为高频互层的细碎屑岩-碳酸盐岩,其中细砂岩、粉砂岩、碳酸盐岩含成矿流体物性较好,页岩、板岩含成矿流体物性较差,构成屏蔽层。金鸡岭Ⅰ级复式向斜控制着金、砷、锑等异常范围;松枣Ⅱ级复式背斜控制着金的矿化带;金龙山—丘岭金矿Ⅲ级背斜控制着金的矿(化)体;镇安—板岩镇断裂的次级断裂是金矿化体的容矿有利位置。在成矿过程中,构造变形与成矿流体的形成、运移及储集密切相关。其规律是:①原生构造导致成矿流体的初次聚集。②第一期构造变形导致成矿流体的聚集。③第二期构造变形导致成矿流体运移及金矿床形成。此期变形是金的主要成矿期。④第三期构造变形使成矿流体进一步聚集和金矿体的富集。⑤第四期构造变形是石英方解石脉的形成时期。总结出矿床形成模式。据此提出了在4种不同的构造部位找金的方向。

The source bed of Jinlongshan-Qiuling Au deposit is the Upper Devonian Nanyangshan formation and Lower Carboniferous Yuanjiagou formation. The deposit is hosted by the highly alternated fine clasitic rock and carbonate rock sequence. Fine sandstone, siltstoneand carbonate rock layers are favourable for the ore fluid transportation and shale and slate layers unfwvourable thus the barring layer of the fluid. The lst-scaleJinjiling synclinorium control Au, As, Sb etc. anomly extent; the 2nd-scale song-zaoanticlinorium Au mineralization zones; the 3rd-scale Jinlongshan-Qiuling anticline Au （mineralized） ore bodies. Gold ore bodies are hosted by sub-faults of Zhenan-Banyanzhen fault. The ore fluid transportation and storage are closely related to the structure and tectonic deformation. The primary structure controls the preliminary storage of ore fluid. The 1st stage tectonic deformation leads to ore fluid accumulation; the 2nd tectonic deformation stage the ore fluid lransportatino and accumulation to form ore bodies and this is the main ore-forming stage; the 3rd tectonic deformation stage the further accumulation and enrichment of the ore bodies. Quartz, calcite veins are formed in the 4th tectonic deformation stage. The further gold ore exploration should be directed to the four kinds of structures.