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车路沟金矿床是北祁连山发现的首例与斑岩有关的碲 -铋 -金型矿床。金矿床成矿地质特征显示 ,矿床形成于岛弧火山期后次火山 -深成中酸性侵入岩体中 ,直接赋存于浅成 -超浅成英安斑岩内 ,其成矿背景为碰撞造山环境。矿床受区域断裂裂隙、同建造期古火山穹隆边缘继承性断裂裂隙 ,尤其受次火山岩体边缘节理、裂隙及接触破碎带控制。同位素研究资料显示 ,成矿流体 δ18OH2 O为 - 6 .5 8‰～ - 2 .30‰ ,δD为 - 5 8.2‰～ - 4 1.8‰ ,δ3 4S为 - 3.84‰～ + 3.2 0‰ ,δ13 CPDB为 - 8.5 4‰～ - 1.32‰ ,盐度为9.37‰～ 11.83‰ [w (Na Cl) eq],密度为 0 .982～ 1.0 0 6 g/ cm3 ,均一温度为 137.6～199.4℃。成矿流体总特征为低温、低气相、中 -高密度、并含有较高 CO2 的 H2 O- CO2 -Na Cl (KCl)体系。厘定了成岩年龄为 4 2 7.7± 4 .5 Ma,成矿年龄在 35 0～ 4 10 Ma。矿床是在岩体固结定位后 ,由深部岩浆房 (源 )分异出的富含 Au、Te、Cu等成矿元素 ,CO2 、SO2 、H2 O等挥发组分的岩浆热液沿控岩构造裂隙带上升 ,不断从沿途已固结的英安斑岩及围岩中萃取成矿物质 ,并与大量大气降水混合作用的产物。矿床成因类型属与斑岩有关的低温热液型碲金矿。
The Cheluditch gold deposit is the first tellurium-bismuth-gold deposit related to porphyry discovered in the North Qilian Mountains. The geological characteristics of the gold deposits show that the deposits formed in the secondary volcano-shencheng intermediate-acid intrusive rock mass of the island arc volcano and directly occur in the shallow-ultra-shallow chengyingan porphyry and the metallogenetic background is collision orogeny surroundings. The deposit is controlled by regional fracture fissures and inherited fracture fissures along the margin of ancient volcanic domes during the construction period, especially by the edge joints, fissures and contact broken zones of subvolcanic bodies. The isotope data show that the δ18OH2 O of the ore-forming fluid is between -65.8 ‰ and -230 ‰, the δD is -5.22 ‰ and -4.8 ‰, the δ3 4S is -3.84 ‰ and +3.02 ‰, and the δ13 CPDB The average salinity was 9.37 ‰ ~ 11.83 ‰ [w (Na Cl) eq] and the density was from 0.982 to 1.06 g / cm3. The homogenization temperature was 137.6-199.4 ℃. The general characteristics of ore-forming fluids are low temperature, low gas phase, medium-high density and high CO2-containing H2 O-CO2-NaCI (KCl) system. The age of diagenesis was 42.7 ± 4.4 Ma and the metallogenic age was 35 0-4 10 Ma. The ore deposit is composed of magmatic hydrothermal fluids rich in Au, Te, Cu and other ore-forming elements, such as CO2, SO2 and H2 O, which are separated from the deep magma chamber (source) Tectonic fracture zone rise, continuous from the consolidation along the encampment of porphyry and surrounding rock mineralization material, and a large amount of atmospheric precipitation mixed product. The genesis of the deposit belongs to porphyry-related low-temperature hydrothermal tellurium gold.