本文選題：造山型金礦 + 礦床地質(zhì)��； 參考：《礦物學(xué)報》2017年06期

【摘要】：姐納各普金礦床位于藏南金銻成礦帶東段,是近年來在扎西康礦集區(qū)內(nèi)新發(fā)現(xiàn)的巖金礦床。礦床產(chǎn)于蝕變輝綠巖中,礦體受北西-南東向韌脆性斷裂及層間破碎帶控制。礦石類型有蝕變巖型和石英脈型2種,呈網(wǎng)脈狀、角礫狀及定向構(gòu)造,土狀、結(jié)晶、碎裂、糜棱結(jié)構(gòu);礦石中金屬礦物主要為黃鐵礦、毒砂、輝銻礦、方鉛礦、閃鋅礦及自然金,脈石礦物以石英、絹云母及綠泥石為主;圍巖蝕變主要為黃鐵絹英巖化和綠泥石化;據(jù)脈體穿插和礦物共生組合,將原生熱液成礦期分為石英-黃鐵礦(早)、石英-金-賤金屬硫化物(中)和石英-碳酸鹽礦物(晚)3個階段。對礦石中石英流體包裹體研究顯示,礦床主成礦階段(中)流體包裹體主要為由純CO_2、水溶液和富CO_2-水溶液流體包裹體3種所構(gòu)成的非均一捕獲流體包裹體組合(F.I.A.),均一溫度為221.7~279.4℃,鹽度為1.57%~6.74%,流體密度為0.58~0.88 g/cm~3,屬中低溫、低鹽度、低密度、富CO_2的H_2O-Na Cl-CO_2±CH_4±N_2體系。主成礦階段內(nèi)見均一溫度相近的不同類型包裹體和同類型具不同氣液比的包裹體共存于同一視域,顯示成礦流體的不混溶性,成礦溫度為218.6~280.4℃,成礦壓力為73~93 MPa。據(jù)成礦壓力估算得成礦深度為5.8~7.9 km,成礦時的地溫梯度為35~45℃/km。礦床地質(zhì)特征及成礦流體性質(zhì)表明,姐納各普金礦床為與巖漿或巖漿熱液活動有關(guān)的造山型金礦床,成礦與中新世印度—歐亞大陸碰撞擠壓向伸展作用的轉(zhuǎn)換有關(guān)。
[Abstract]:The Sinagopu gold deposit, located in the eastern section of the gold-antimony metallogenic belt in southern Tibet, is a newly discovered rock gold deposit in the Zaxikang ore concentration area in recent years. The deposit occurs in altered diabase and the orebody is controlled by NW-SE ductile brittle fracture and interlayer fracture zone. There are two types of ore types: altered rock type and quartz vein type, with reticular vein, breccia and directional structure, soil shape, crystallization, fragmentation, chyme structure, pyrite, arsenopyrite, stibnite, galena, pyrite, pyrite, pyrite, galena, pyrite, stibnite and galena. Sphalerite and natural gold, gangue minerals are mainly quartz, sericite and chlorite; rock alteration is mainly yellowish sericite and greenstone; according to vein intercalation and mineral symbiotic assemblage, The metallogenic epoch of primary hydrothermal solution is divided into three stages: quartz pyrite (early pyrite) quartz-gold-base metal sulfide (middle) and quartz-carbonate mineral (late). The study of quartz fluid inclusions in ores shows that, In the main metallogenic stage (middle) of the deposit, the fluid inclusions are mainly composed of three kinds of fluid inclusions consisting of pure COD 2, aqueous solution and CO2- rich aqueous fluid inclusions. The homogeneous temperature is 221.7N 279.4 鈩，

本文編號：1835966