資源勘查工程畢業設計外文譯文-巖漿巖熱矽卡巖型礦床中成礦流體的組成和演化-免費閱讀

　　

【正文】 C) and lithostatic pressure (4450 bar。 Ulrich et al.,1999, 2021). Unfortunately, no plementary data exist for skarn deposits, and furthermore there has been no microchemical evaluation of the later, lowsalinity fluids in either deposit type. Understanding the chemistry of the later fluids is critical because there is much con troversy as to whether they are dominantly magmatic fluids (Harris and Golding, 2021。 Baker and Lang, 2021。 Hedenquist et al., 1998。然而，氯化物是后期低鹽度巖漿流體的情況下形成銅元素運移的原因。鉛鋅的最高濃度出現在早期鹵水和蒸汽包裹體內 0)3000 P》 m) 。 Ryan等人 (2021)對技術的細節做了報告。 Bakel、和 Lang (2021)提出了巖漿熱液矽卡巖系統的初始條件較高的溫度 (約 50O。由于典型的均化現象難以觀測，所以目前還沒有蒸氣包體的數據記錄。 正開采的墨西哥卑斯麥礦床與巖株接觸的矽卡巖有關的塊狀硫化物中含有鋅、鉛、銅、銀礦。Ulrich 等人 ,1999,2021)。Baker 和 Lang,2021)。 引言 金屬礦床產出在斑巖侵入到碳酸鹽巖的構造或其周圍是世界上斑巖型、矽卡巖型、管狀和席狀類型是 Cu、 Pb、 Zn、 Ag 和 Au 礦床的主要來源，這反映出了從近端到遠端的侵入 (后三種類型總稱為高溫碳酸鹽交代礦床 )。研究結果支持一個在高溫和巖石靜壓力下調用早期相分的巖漿流體進入鹵水和蒸汽 (兩相場 )其次是在較低溫度和靜水壓力下包封低鹽度巖漿流體 (一相場 )的模型。Ca 值巖漿流體的不同脈沖其中基本金屬，包括銅，被氯化物絡合物運移。Meinert 等 人， 1997 ，2021。一些微量分析技術的進步，比如激光電感模式結合大量等離子體光譜測定 (LAICPMS。 在本文中，論述了對墨西哥卑斯麥矽卡巖礦床早期巖漿鹵水蒸汽包體和低鹽流體包裹體總體的質子激發 X 熒光分析。最早 的流體包裹體是在成礦之前的螢石和石英內產生的，它與最初的鹵水和蒸汽夾雜物共存。 4到 10.》 NaCl溶液中鹽的含量。在低鹽度、一相場的巖漿流體 (臨界包體 )情況下捕獲了流體包裹體。鈣、錳、鐵在液相和日前尚未確認的固相內部有出現。 圖 2 質子激發 X熒光分析圖 A 鹵水； B蒸汽； C臨界包體 結 論 對仲斯麥矽卡巖礦床中的鹵水，蒸氣，低鹽度流體包裹體的質子激發 X熒光分析，認為三種流體類型都為巖漿成因。 Titley, 1993). Evaluation of fluid inclusions in skarn and porphyry deposits has shown that a critical factor in their formation is the exsolution of metalbearing fluids from felsic magmas (Burnham,1979。 Burnham, 1979。 Heinrich et al., 1992。C and salinity estimates range between 32 and 62 wt% NaCl equivalent. No data were recorded for vapor inclusions because of the typical difficulty of observing homogenization phenomena. Pressure estimates suggest entrapment pressures of 4450 bar during immisci bility. Primary inclusions in preore to synore quartz contain 40–60 vol% vapor and exhibit critical to nearcritical homogenization behav ior between 351 and 438 176。C (Fig. 1). Fluid inclusions trapped during this event contain a lowsalinity, onephase field magmatic fluid (critical inclusions)。 Taylor, 1992). In this paper we report PIXE analyses of early magmatic brine and vapor inclusions, and a population of later, lowsalinity fluid in clusions from the Bismark skarn deposit, Mexico. The results provide the first insights into metal partitioning between brine and vapor in clusions in skarn deposits, and also highlight the importance of low salinity magmatic fluids in ore deposition. Furthermore, the data provide insights into the relationship between magmatichydrothermal fluid basemetal concentrations and bulkore grades in Mexican CRDs. GEOLOGY AND FLUID EVOLUTION OF THE BISMARK SKARN The operating Bismark Mine, Mexico, contains Zn, Pb, Cu, and Ag ore in massive sulfide associated with stockcontact skarn ( Mt at 8% Zn, % Pb, % Cu, and 50 g/t Ag。 Heinrich et al., 1999。 Fulignati et al., 2021。 however, the vapor contains significantly more Cu than the brine and was likely transported as a sulfur plex. The f