【摘要】 微细浸染型金矿赋矿岩石以钙质粉砂岩为主。许多矿区既有产于沉积岩中的浸染型矿化又有产于断裂中的脉型矿化 ,按照岩浆热液成矿体系 ,在微细浸染型金矿产出地区要注意近岩浆源的斑岩型、夕卡岩型等金矿化。成矿深度可达 2～ 4km。Au主要呈纳米级微细粒或单原子状态自由金 (Au0 ) ,也有的呈晶格金或结构金 (AuⅠ)存在于含As黄铁矿或毒砂中 ,但在一个沉积岩地区的金矿不一定全是浸染型金矿 ,金的粒度也可更大。深部岩浆、变质 (含Au)流体在构造 岩浆活动中向上运移与不同岩性和 (或 )流体反应 ,在浅部有利构造部位沉淀成矿的成矿模式被越来越多的人接受。勘查工作要围绕以 (高角度 )断裂与深部连通的有利岩性寻找浸染型矿化 ,同时要十分注意脆性地层中直接受断裂控制的脉型金矿化更多还原

【Abstract】 Calcareous siltstone is the main host rock of micro fine disseminated gold deposit(MDGD).In addition to disseminated mineralization in sedimentary rock,there are fault controlled vein type mineralization in the province of MDGD.According to the viewpoint of magmatic hydrothermal solution metallogenic system,it should be taken enough attention on the porphyry type and skarn type gold mineralization which are proximal to source instrusives where MDGD occurs in district.Depth of ore forming of MDGD may be 2～4 km.Most of gold exist as micro fine grain in nameter degree or free Au in single atom,others exist in asenian bearing pyrite or in arsenopyrite as crystal lattice gold.But not all gold deposits are MDGD in a sedimentary rock area,the grain of gold may vary greatly.More and more people agree the metallogenic model that deep(magmatic or metamorphic) gold bearing fluid move upward and react with different lithologies or fluids during tectonic magmatic activity,finally precipitated in favorable structural position.Disseminated mineralization could be found in favorable lithologies that connected with deep by high angle faults.Vein type mineralization that controlled directly by faults could be found in brittle rock.更多还原