伊朗中部带-纳尔日斯卡岩铁矿中矽卡岩形成流体的起源与发育

IF 1 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Malihe Nazari, M. Lotfi, N. Nezafati, Nemat Allah Rashid Nejad Omran
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引用次数: 0

摘要

Band-e-Narges磁铁矿矿床位于Urumieh–Dokhtar岩浆弧的中部。据报道,由于UDMA中的始新世侵入过程,Koh-e Latif地区出现了广泛的I型火山口碱性和碱性岩浆活动。该区矿化经历了五个共生阶段:前进阶段、后退阶段、硫化物-石英阶段、碳酸盐阶段和氧化阶段。黄铁矿和硬石膏+黄铁矿的所有δ34S值的结果表明,这些矿床的δ34S均为正,与岩浆硫来源有关。根据石榴石、石英和方解石矿物中不同阶段的岩相和微观温度包裹体,观察到了流体包裹体。根据前进矽卡岩阶段流体包裹体的高温和中等盐度,流体包裹体与钙质围岩发生反应,流体包裹物在400至500巴的压力下被捕获,对应于1.5至2km的深度。石英中的流体包裹体具有中等温度和低盐度,表明石英硫化物阶段和逆行晚期。具有中等均化温度(300至350℃)的流体包裹体表明,在150至250巴的静水压力下,再沸发生,相当于在晚期逆行矽卡岩和石英硫化物阶段的深度为1至1.5公里。方解石中的流体包裹体具有中等温度和低至高盐度。Band-e-Narges铁矿床流体包裹体群的地质、矿物学、地球化学、盐度和均化温度遵循减压、混合和冷却导致的沸腾模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Origin and Development of Skarn-Forming Fluids from the Band-e-Narges Skarn Iron Ore- Central Iran
The Band-e-Narges magnetite deposit is located in the central part of Urumieh–Dokhtar Magmatic Arc. Wide I-type calk-alkaline and alkalin magmatic activity in the Koh-e Latif region has been reported due to Eocene intrusive processes in UDMA. Five stages of paragenesis have been observed in the mineralization in this area: prograde stage, retrograde stage, sulfide- quartz stage, carbonate stage and Oxidation stage.The result of all δ34S values of pyrite and anhydrite + pyrite shows values are positive with a magmatic sulfur origin in these deposits. fluid inclusions have been observed according to the petrographic and microtermometric inclusions within garnet, quartz, and calcite minerals at various stages. According to high temperature and middle salinity of fluid inclusions in prograde skarn-stage, the fluid inclusions shows reaction with the calcareous wall rock and fluid inclusions were trapped at pressures of 400 to 500 bars, corresponding to depths of 1.5 to 2 km .Fluid inclusions in quartz have moderate temperatures and low salinity indicating quartz-sulfide stage and late retrograde stage. fluid inclusions with moderate homogenization temperature (300 to 350 oC ) suggest that reboiling coccurred under hydrostatic pressure of 150 to 250 bars, equivalent to a depth of 1 to 1.5 km in the late retrograde skarn and quartz-sulfide stages. Fluid inclusions in calcite have moderate temperatures and low to high salinities . The geology, mineralogy, geochemistry, salinities and homogenization-temperatures from the fluid inclusions populations at the Band-e-Narges iron deposit are follows a model of boiling as a result of decrease pressure, mixing and cooling.
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来源期刊
Iranian Journal of Earth Sciences
Iranian Journal of Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
1.40
自引率
12.50%
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0
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