西藏鐵格隆南Cu-Au礦床成礦流體特征及與礦化蝕變的內(nèi)在聯(lián)系
發(fā)布時(shí)間:2019-03-21 17:52
【摘要】:鐵格隆南是一個(gè)超大型的斑巖-高硫化型淺成低溫?zé)嵋篊u-Au礦床,該礦床位于中國(guó)西藏班公怒江成礦帶多龍礦集區(qū)內(nèi)。為了更好地限制該礦床在成礦過(guò)程中的物理?xiàng)l件,本次研究主要選擇了流體包裹體群進(jìn)行顯微測(cè)溫。在斑巖系統(tǒng)中,Qz-Cpy脈主要捕獲了富液相流體,其N(xiāo)a Cl鹽度為9.2%~12.9%,捕獲溫度為330~360℃,壓力為121~170 bars,對(duì)應(yīng)古深度為1.21~1.70 km。采樣位置為地表以下1.03~1.07 km處,推算該處剝蝕深度為0.18~0.67 km。石英斑晶中流體包裹體以高鹽度(LVS)和富氣相流體(VL)為主,高鹽度流體的Na Cl鹽度為29.3%~35.8%,最低捕獲溫度為330~350℃。在淺成低溫?zé)嵋合到y(tǒng)中,Qz-Aln-Py-Tn-Cv脈和石英斑晶主要捕獲了高鹽度(LVS)和富氣相(VL)包裹體,其中LVS在礦化脈和石英斑晶中的Na Cl鹽度分別為30.7%~32.4%和29.3%~35.8%,兩者最低捕獲溫度一致,為310~320℃,對(duì)應(yīng)最小壓力為74~84 bars,最小古深度為0.74~0.84 km。采樣位置為地表以下183.8~188.1m處,因此推算該處的最小剝蝕深度為0.55~0.65 km。通過(guò)拉曼光譜分析,發(fā)現(xiàn)在斑巖系統(tǒng)中,石英斑晶捕獲的流體包裹體所包含的金屬礦物主要為黃銅礦、赤鐵礦,與斑巖系統(tǒng)的金屬礦化類(lèi)型一致;在淺成低溫?zé)嵋合到y(tǒng)中,石英斑晶捕獲的流體包裹體所包含的金屬礦物為黃鐵礦、銅藍(lán),也與蝕變巖中的金屬礦物組合一致。同時(shí),石英斑晶捕獲的流體包裹體大部分定向穿切石英斑晶,并且與含礦石英脈具有一致的均一溫度峰值。上述流體特征表明石英斑晶捕獲了大量成礦流體。此外,這些流體包裹體中的金屬礦物在高鹽度流體和低密度流體中都存在,因此,這兩種流體都具有搬運(yùn)Cu的能力。通過(guò)以上研究認(rèn)為,流體相分離、均一溫度、鹽度、流體包裹體所包含的金屬礦物能夠指示斑巖-淺成低溫?zé)嵋合到y(tǒng)的礦化條件,并且這些流體確實(shí)能夠搬運(yùn)成礦物質(zhì),與鐵格隆南斑巖-淺成低溫?zé)嵋旱V化直接相關(guān)。
[Abstract]:Tiegronan is a super-large porphyry-high sulphide type shallow hydrothermal Cu-Au deposit, which is located in the Dulong ore concentration area of the BangongNujiang metallogenic belt, Tibet, China. In order to restrict the physical conditions of the deposit in the process of mineralization, the fluid inclusion group was chosen to measure the temperature by microscope in this study. In porphyry system, the Qz-Cpy vein mainly captures the liquid-rich fluid, the Na Cl salinity is 9.2% ~ 12.9%, the capture temperature is 330 鈩,
本文編號(hào):2445175
[Abstract]:Tiegronan is a super-large porphyry-high sulphide type shallow hydrothermal Cu-Au deposit, which is located in the Dulong ore concentration area of the BangongNujiang metallogenic belt, Tibet, China. In order to restrict the physical conditions of the deposit in the process of mineralization, the fluid inclusion group was chosen to measure the temperature by microscope in this study. In porphyry system, the Qz-Cpy vein mainly captures the liquid-rich fluid, the Na Cl salinity is 9.2% ~ 12.9%, the capture temperature is 330 鈩,
本文編號(hào):2445175
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