(1. 中南大學(xué)地球科學(xué)與信息物理學(xué)院有色金屬成礦預(yù)測(cè)教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083；
2. 靈丘縣梨園金礦有限責(zé)任公司，靈丘 034403)
摘 要: 山西梨園金礦位于太行山構(gòu)造-巖漿-多金屬成礦帶上，礦體賦存于北北東向的構(gòu)造帶中，礦床熱液作用包括石英脈階段(A)、石英-黃鐵礦階段(B)、石英-多金屬硫化物階段(C)和石英-碳酸鹽階段(D)。B、C、D階段的石英中發(fā)育3類包裹體：氣液兩相包裹體(Ⅰ型)、水溶液-CO2包裹體(Ⅱ型)以及純CO2包裹體(III型)。B階段發(fā)育Ⅰ型包裹體、部分Ⅱ型及Ⅲ型包裹體，均一溫度集中于230~350℃，鹽度為1.82%~12.63%；C階段發(fā)育Ⅰ型包裹體，Ⅱ型及Ⅲ型包裹體明顯增多，均一溫度集中于200~330℃，鹽度為1.82%~9.71%；D階段主要發(fā)育Ⅰ型包裹體，均一溫度集中于140~170 ℃，鹽度為1.16%~9.58%。包裹體氣相成分含有較高密度的CO2和CO、N2、H2、CH4等，液相成分主要為Ca2+、Na+、K+、SO42-、Cl-、F-。估算成礦壓力為68~114 MPa，對(duì)應(yīng)的捕獲溫度為200~430℃，估算最大成礦深度為4.3km。梨園金礦成礦流體為低鹽度、中低溫、富CO2的Ca2+(Na+、K+)-SO42-(Cl-、F-)-H2O-CO2體系，可能為后期巖漿熱液流體。礦床形成于陸內(nèi)造山環(huán)境，為受斷裂破碎帶控制的巖漿熱液蝕變巖型金礦。
關(guān)鍵字: 流體包裹體；成礦流體；包裹體成分；礦床成因；梨園金礦
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
2. Liyuan Gold Deposit Limited Liability Company, Lingqiu 034403, China）
Abstract:Liyuan Gold Deposit is located at the Taihang Mountain tectonic-magma-polymetallic metallogenic belt. Ore bodies mainly occur in the NNE-trending structural zone. The hydrothermal process can be divided into four stages, namely, A stage (quartz vein stage), B stage (quartz-pyrite stage), C stage (quartz-polymetallic sulfide stage) and D stage (quartz-carbonate stage). Three types of fluid inclusions are developed in B, C and D stages: aqueous inclusion (type Ⅰ), CO2-aqueous inclusion (type Ⅱ) and pure CO2 inclusion (type Ⅲ). All three types of inclusions, mainly type I inclusions present in stage B, with homogenization temperatures ranging in 230-350 ℃, and salinities ranging from 1.82% to 12.63%. In addition to development of type Ⅰ inclusions, type Ⅱ and Ⅲ inclusions increase significantly in stage C, with homogenization temperatures ranging from 200 ℃ to 330 ℃, salinities ranging in 1.82%-9.71%. Type Ⅰ inclusions relatively develop in stage D, with homogenization temperatures concentrating in 140-170 ℃, and salinities ranging from 1.16% to 9.58%. High density of CO2 and CH4, H2 and N2 are found as gascompositions in the inclusions. Liquid phase of fluid is mainly composed of Ca2+, Na+, K+, SO42-, Cl-, F-. The calculated metallogenic pressures are in the range of 68-114 MPa, corresponding to capture temperature of 200-430 ℃, and the maximum estimated mineralization depth is 4.3km. To sum up, the mineralization fluid of Liyuan Gold Deposit may be late magmatic hydrothermal fluid, belongs to low salinity, medium-low temperature,CO2-rich Ca2+(Na+, K+)-SO42-(Cl-, F-)-H2O-CO2 system. Liyuan Gold Deposit formed in intracontinental orogeny belongs to magmatic hydrothermal altered rock type gold deposit controlled by fracture zone.
Key words: fluid inclusion; mineralization fluid; fluid inclusion composition; ore genesis; Liyuan Gold Deposit
