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尕尔穷铜金矿床位于西藏班公湖-怒江成矿带西段,是该带上近年来取得重大勘查突破的矽卡岩(斑岩)型铜金矿床。矿区产出的矽卡岩为典型的钙质矽卡岩,其矽卡岩矿物主要由石榴子石、辉石、硅灰石、绿帘石、绿泥石、符山石、矽线石等组成。电子探针分析结果表明,矿区石榴子石主要为钙铁榴石和钙铝榴石,辉石主要为透辉石,绿泥石可见铁绿泥石及铁镁绿泥石两种。石榴子石成分剖面显示其矿物组分随着石榴子石环带的变化而变化,表明矿区矽卡岩不是在一个完全封闭的平衡条件下形成的,指示矿床形成过程中热液流体具有多期多阶段性。尕尔穷矿区矽卡岩具有良好的分带性,表现为从靠近岩体的深部到靠近围岩的浅部具有石榴子石-透辉石相→透辉石-硅灰石相→硅灰石-绿帘石绿泥石相的分带特征,并伴随一定的矿化组合。典型矽卡岩矿物端员组分的识别及其Fe2+/Fe3+的比值计算结果表明,尕尔穷矿床形成于相对氧化环境。辉石组分中Mn/Fe比值的特征表明尕尔穷矿区具有一定的寻找钼矿的潜力。
The Gol-poor copper-gold deposit is located in the western section of the Bangong Lake-Nujiang metallogenic belt in Tibet, and is the skarn (porphyry) -type copper-gold deposit that has brought major exploration breakthroughs in recent years. The skarn output from the mines is a typical calcareous skarn. The skarn minerals are mainly composed of garnet, pyroxene, wollastonite, epidote, chlorite, fursanite, and sillimanite . The results of electron probe analysis showed that the garnet in the mining area is mainly composed of garnet and goadite, pyroxene is mainly diopside, and chlorite can be found in two kinds of ferrocene and fermagite. The profile of the garnet component shows that the mineral composition changes with the change of the garnet zone, indicating that the skarn in the ore area is not formed under a completely closed equilibrium condition, indicating that the hydrothermal fluid has a multi-period Multi-stage. There are good zonality of skarn in Gaerlur mining area, which shows that there are garnet-diopside phase → diopside-wollastonite → silica fume from the depths near the rock mass to the shallow part near the surrounding rock Stones - green curtain chlorite phase zoning characteristics, and accompanied by a certain combination of mineralization. The identification of the typical skarn mineral endmember component and the calculation of its Fe2 + / Fe3 + ratio show that the Gaer poor deposit is formed in a relatively oxidized environment. The characteristics of the Mn / Fe ratio in the pyroxene component indicate that the potential of the Qaer poor mining area has certain potential for finding molybdenum ore.