《有效勘查技术方法集成示范》成果报告（2018-2021）

本课题以西藏重要成矿带斑岩-矽卡岩-浅成低温热液型铜多金属矿为研究对象，以重要矿（集）区前期勘查和研究成果为基础，对其深部岩浆、构造、流体蚀变与矿化体系发育特征进行综合调查研究，以有效解剖重点矿区成矿系统结构。重点对形成于洋壳俯冲末期至陆陆软碰撞阶段的多龙斑岩-浅成低温热液型铜金矿控矿构造与岩浆-矿化-蚀变体系耦合关系进行精细解剖；同时，对其成矿系统的形成、改造和保存机制进行综合研究，以形成找矿预测示范。对印度-欧亚大陆碰撞走滑构造转换阶段形成的北衙斑岩铜金成矿系统进行三维结构解剖，以实现对其成矿过程的精准把握并有效实现深部矿体的定位预测。利用传统矿床学与非传统钾、镁同位素等手段分别对甲玛斑岩成矿系统岩浆、热液演化-流体运移-金属沉淀机制和成矿流体运移过程进行解剖，建立矿床岩浆-流体演化模式，实现找矿预测。最后，基于甲玛-驱龙矿集区、朱诺、雄村矿集区、扎西康-错那洞矿集区、多龙矿集区勘查成果，综合集成各重点矿（集）区成矿系统的有效勘查技术方法组合并形成示范This study takes porphyry-skarn-epithermal copper-polymetallic deposits in the major metallogenic belts of Tibet as the research subject. Based on the preliminary exploration and research results of key ore districts and ore concentration areas, we conduct comprehensive investigations on the developmental characteristics of deep magma, tectonics, fluid alteration and mineralization systems, so as to effectively dissect the metallogenic system structure of key mining areas. Focusing on the Duolong porphyry-epithermal Cu-Au deposits formed during the late oceanic crust subduction to continental-continental soft collision stage, we perform detailed dissection of the coupling relationship between their ore-controlling structures and magma-mineralization-alteration systems. Meanwhile, we conduct comprehensive research on the formation, reformation and preservation mechanisms of its metallogenic system to establish prospecting prediction demonstrations. We also carry out 3D structural dissection of the Beiya porphyry Cu-Au metallogenic system formed during the strike-slip tectonic transition stage of the India-Eurasia continental collision, so as to accurately grasp its metallogenic process and effectively realize the orientation and prediction of deep ore bodies. Using traditional deposit geology and non-traditional potassium and magnesium isotopes and other analytical methods, we dissect the magma, hydrothermal evolution-fluid migration-metal precipitation mechanisms and metallogenic fluid migration processes of the Jiama porphyry metallogenic system respectively, establish the magma-fluid evolution model of the deposit, and achieve prospecting prediction. Finally, based on the exploration results of the Jiama-Qulong ore concentration area, Zhunu ore deposit, Xiongcun ore concentration area, Zhaxikang-Cuonadong ore concentration area and Duolong ore concentration area, we comprehensively integrate the effective exploration technical method combinations of the metallogenic systems of each key ore district and ore concentration area, and form standardized demonstration cases.