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位于青藏高原东缘的玉龙铜矿是我国最大的斑岩铜矿之一,其形成一致认为与矿区中心产出的二长花岗质复式斑岩体有关,但成矿与复式岩体的确切关系并不清楚。本文通过详细的野外地质填图,特别是矿床8号勘探线12个钻孔的重新编录,在复式岩体中识别出一套花岗斑岩岩枝,岩枝中不规则状石英-钾长石脉广泛发育,同时还见有单向固结结构、粗晶及细晶结构,这些特征表明该岩浆中的流体曾经发生过饱和。同时结合矿床高品位(>0.6%,质量分数)铜矿化紧密围绕花岗斑岩分布、含矿脉体自花岗斑岩向外围逐渐由高温石英-钾长石A脉过渡为中低温石英-硫化物脉、热液蚀变自花岗斑岩向外由高温钾硅酸盐化过渡为中低温石英-绢云母化的规律,最终确定这套花岗斑岩为玉龙矿床的成矿斑岩。玉龙铜矿成矿斑岩的厘定,较好地解释了矿床矿化类型及金属的分布规律,为进一步深入理解矿床形成过程提供了帮助。
The Yulong Copper Mine located on the eastern edge of the Qinghai-Tibet Plateau is one of the largest porphyry copper deposits in China and its formation is thought to be related to the monzonitic granodiorite porphyry produced at the center of the mining area. However, the exact ore-forming and compound rock mass The relationship is not clear. In this paper, a detailed set of granite porphyry rocks are identified in the complex rock by the detailed field geologic mapping, especially the recalculation of 12 boreholes in the No.8 prospecting line. The irregular quartz-potassium feldspar Extensive development, but also see the unidirectional consolidation structure, coarse grain and fine grain structure, these characteristics indicate that the fluid in the magma once saturated. At the same time, the mineralization of granite porphyry closely conforms to the high-grade (> 0.6%, mass fraction) copper mineralization of ore deposit, and the ore-bearing veins transition from high-temperature quartz-potassium feldspar A vein to low temperature quartz- The sulfide veins and hydrothermal alteration change from high-temperature potassium-silicate to quartz-sericitization in the low-temperature from granite porphyry. The granitic porphyry is the mineralized porphyry of the Yulong deposit . The determination of ore-forming porphyries of Yulong copper deposit, which can well explain the types of mineralization and the distribution of metals, has helped to further understand the formation process of the ore deposits.