云南中甸地区浪都矽卡岩型铜矿床富CH4流体地球化学研究

富CH4流体地球化学是近年来矿床学研究的热点问题之一，尽管富CH4流体深入探讨可以为成矿过程提供新的约束，但其研究尚处于探索阶段。浪都矽卡岩矿床是中甸地区最富的铜矿床(平均品位6.49%),最近在该矿床中发现了大量富CH4流体包裹体，使其成为富CH4流体地球化学研究的理想载体。本申请以浪都矿床中富CH4流体包裹体为研究对象，在野外地质调研、样品系统采集、详细的岩相学观察基础上，通过流体包裹体显微测温、激光拉曼、单个流体包裹体成分测试及矿物 C、H、O、S同位素分析，探索CH4在成矿元素迁移、富集、沉淀过程中的地球化学行为，阐明成矿流体的来源及成矿P-T-V条件，反演流体演化过程，揭示矿床的成矿机制。通过与区域内其它典型矿床综合对比研究，为丰富和完善中甸铜多金属矿集区成矿理论提供依据，为区内深部和外围找矿工作提供理论指导，增强发现新矿床的科学预测能力。

The CH4 rich fluid geochemistry is one of the hot point in the study of ore deposit in recent years. Although CH4-rich fluid study could provide new constraints on the ore forming process, the CH4 geochemical action in hydrothermal fluid is still in the exploratory stage. The Langdu skarn copper deposit which belongs to the typical Triassic copper deposit in Sanjiang tectono-magmatic zone is located at the Zhongdian island arc belt, NW Yunnan province. It is the richest copper deposits (average grade of 6.49%) in the region. The mineralization is related to a porphyry intrusion (～216Ma), originally associated with the subduction of the Garzê-Litang oceanic crust. Recently, we have found a large number of CH4-rich fluid inclusions in the deposit, making the deposit as an ideal carrier of the CH4-rich fluid geochemistry study. This application focus on the CH4-rich inclusions from the Landgu skarn copper deposit. Based on geological investigate, the systemic sample collection and detailed petrographic observation, using microthermomety, Raman microprobe, single fluid inclusion composition and carbon, oxygen, hydrogen and sulfur isotope analysis techniques, we will explore the geochemical action of CH4 in the ore-forming element migration, enrichment and disposition, refinedly reflect the ore-forming fluid evolution, exactly build the P-T-X condition, and well reveal the mineralization mechanisms of Langdu deposit. As comprehensive comparison study with other deposits in the region could enrich and improve multi-metal metallogenic theory in the Zhongdian area. The research also provides theoretical guidance to peripheral prospecting and exploration work, and further enhance the predictive ability of new mineral deposits.