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小柳沟矿区是北祁连造山带西段主要的钨钼成矿区。钨成矿主要受岩体、地层岩性、构造控制。岩体是成矿的最主要因素,是矿床的成矿物质来源之一,酸性侵入体为成矿提供了丰富的物质来源;岩体在侵入过程中所提供的含矿热液对元素的活化迁移起了积极作用。千枚岩、灰岩、角闪云母片岩是成矿的主要矿源层。小柳沟隐伏岩体上升形成的断层为成矿流体的运移和富集提供了条件。钼成矿与岩体及岩体顶部的裂隙网脉有关。小柳沟热流体在斑状花岗岩体顶部形成构造裂隙网,上升热流体与地下水发生对流循环,使钼在岩体和围岩的裂隙中成矿。小柳沟矿区有着三(多)位一体的成矿系列,岩体外接触带和地层层间裂隙形成以夕卡岩型为主的白钨矿,岩体内部及岩体顶部形成斑岩型和石英脉型钼矿。
Xiaoliuogou Mining Area is the main tungsten-molybdenum metallogenic area in the western part of North Qilian orogenic belt. Tungsten metallogenesis is mainly controlled by rock mass, formation lithology and tectonics. Rock mass is one of the most important metallogenic factors, which is one of the ore-forming material sources of ore deposits. Acid intrusive body provides a rich source of material for ore-forming. Activation of elements by mineral-bearing hydrothermal fluids provided by rock mass during intrusion Migration has played a positive role. Phyllite, limestone and hornblende micrit schist are the main source rocks of ore-forming. The fault formed by the rising of Xiaoliuougou concealed rock mass provides the conditions for the migration and enrichment of ore-forming fluid. Molybdenum mineralization is related to the fractured reticular veins at the top of rock mass and rock mass. The Xiaoliuou thermal fluid forms a structural fracture network at the top of the porphyritic granite. The ascending thermal fluid convects and circulates with the groundwater, causing molybdenum mineralization in the rock mass and the surrounding rock. The Xiaoliuogou mining area has a series of metallogenic series with three (multiple) sites. The outer contact zone of rock mass and the interlayer fissure form scheelite with skarn-type as the main part, and the interior of the rock mass and the top of the rock mass form porphyry Quartz vein type molybdenum ore.