本文選題：銅鉬分離 + 成礦流體�。� 參考：《巖石學(xué)報(bào)》2017年02期

【摘要】：西藏甲瑪?shù)V床是岡底斯成礦帶中東段目前勘查程度最高、第一個(gè)規(guī)�；_發(fā)的超大型斑巖成礦系統(tǒng),主要由矽卡巖銅多金屬礦體、斑巖鉬(銅)礦體以及角巖銅鉬礦體構(gòu)成。文章以甲瑪?shù)V床角巖礦體和斑巖礦體中典型的"上銅下鉬"現(xiàn)象為切入點(diǎn),借助流體包裹體顯微測(cè)溫、激光拉曼測(cè)試、同步輻射X射線熒光分析(SR-XRF)等研究方法,分析了甲瑪?shù)V床銅鉬礦化階段成礦流體的物化條件差異及微量元素遷移行為。流體包裹體研究結(jié)果表明:銅礦化階段流體溫度(大致在235~451℃,主要集中在340~380℃之間)總體上大于鉬礦化階段流體溫度(大致在213~500℃,主要集中在310~360℃之間),但兩種成礦流體的鹽度大致相似,主要位于18%NaCleqv與30%NaCleqv這兩個(gè)區(qū)間,缺乏鹽度中間過渡區(qū),說明成礦流體經(jīng)歷了沸騰作用。激光拉曼顯微探針測(cè)試結(jié)果表明,Cu礦化階段的流體氧化性較Mo礦化階段更強(qiáng),而Mo礦化階段流體略呈還原性。單個(gè)流體包裹體同步輻射X射線熒光分析顯示,Cu、Au、Fe、Mn、S、As等元素主要在氣相中廣泛分布,而Mo則主要?dú)埩粼谝合嘀羞w移富集。因此,本文認(rèn)為甲瑪?shù)V床中角巖型和斑巖型礦體呈現(xiàn)"上銅下鉬、早銅晚鉬"現(xiàn)象,主要由銅、鉬元素本身的物化性質(zhì),含礦巖漿性質(zhì)和侵位順序與深度,以及含礦巖漿后期所分異出的成礦流體的氧化還原性以及其中S含量的差異所致。
[Abstract]:Jiama deposit in Tibet is the highest exploration level in the eastern section of the Gangdis metallogenic belt at present. The first large-scale porphyry metallogenic system developed on a large scale is mainly composed of skarn copper polymetallic orebody porphyry molybdenum ore body and hornstone copper-molybdenum ore body. In this paper, the typical "upper copper and lower molybdenum" phenomena in the hornstone and porphyry orebodies of Jiama deposit are taken as the starting point, and the research methods such as fluid inclusion microthermometry, laser Raman measurement, synchrotron radiation X-ray fluorescence analysis (SR-XRF) and so on are used. The difference of physical and chemical conditions and trace element migration behavior of ore-forming fluids in copper and molybdenum mineralization stage in Jiama deposit were analyzed. The results of fluid inclusion study show that the fluid temperature in copper mineralization stage (about 235U 451 鈩，

本文編號(hào)：1856598