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Porphyry-type mineralization associated with epithermal deposits in the Tarom metallogenic belt of NW Iran: Constraints from fluid inclusions
Journal of Geochemical Exploration ( IF 3.4 ) Pub Date : 2021-01-07 , DOI: 10.1016/j.gexplo.2021.106724
Seyed Hedayatalah Mousavi Motlagh , Majid Ghaderi , Narges Yasami

Research is conducted to investigate whether or not, apart from the Chodarchay deposit, there are other examples of porphyry-type mineralization associated with epithermal deposits in the Tarom metallogenic belt of the Alborz zone, NW Iran. Homogenization temperature, final ice-melting, and salinity values are determined for fluid inclusions in mostly quartz and partly calcite, fluorite, sphalerite, and barite samples from eight epithermal ore deposits to unravel the enigma on porphyry-type mineralization in Tarom. The homogenization temperatures and salinities of the fluid inclusions range from 82 to 520 °C and 0.2 to 37 wt% NaCl equiv., respectively. The fluid inclusions show varying densities from 0.4 to ~1.2 g/cm3 with most values between 0.7 and 0.95 g/cm3. Tarom epithermal deposits in order of maximum mineralization depth are Chargar (520 m), Zajkan (640 m), Goloujeh (770 m), Lohneh (1075 m), Nikoueieh (1150 m), Khalifelou (1500 m), Aghkand (1690 m), and Chodarchay (1900 m). It seems that magmatic water played an important role in the Tarom epithermal deposits except for Chargar where mixing magmatic and meteoric waters is considered as the main mechanism for ore deposition. The physicochemical variations suggest differences among epithermal deposits in the Tarom district. Chodarchay, Lohneh, Khalifelou, and Goloujeh have some fluid inclusion features of porphyry mineralization associated with an epithermal part. Minerals from Tarom contain fluid inclusions indicative of porphyry mineralization beneath some intermediate- and high-sulfidation epithermal deposits. The findings of this study are instrumental in the exploration of deeper porphyry parts of the Tarom epithermal deposits.



中文翻译:

伊朗西北塔罗姆成矿带超热矿床的斑岩型矿化:流体包裹体的约束

进行研究以调查除Chodarchay矿床外,是否存在伊朗西北部Alborz区Tarom成矿带与超热矿床有关的斑岩型矿化实例。确定了来自8个超热矿石矿床的石英,部分方解石,萤石,闪锌矿和重晶石样品中流体包裹体的均质温度,最终冰融化和盐度值,以解开Tarom斑岩型矿化的谜团。流体夹杂物的均质温度和盐度分别为82至520°C和0.2至37 wt%的NaCl当量。流体包裹体的密度变化范围从0.4到〜1.2 g / cm 3,大多数值在0.7到0.95 g / cm 3之间。Tarom超热矿床的最大成矿深度依次为Chargar(520 m),Zajkan(640 m),Goloujeh(770 m),Lohneh(1075 m),Nikoueieh(1150 m),Khalifelou(1500 m),Aghkand(1690 m) )和Chodarchay(1900 m)。似乎岩浆水在塔罗姆(Tarom)超热矿床中发挥了重要作用,除了查加尔(Chargar)地区,混合岩浆水和陨石水被认为是矿床沉积的主要机制。理化变化表明塔罗姆地区超热沉积之间存在差异。Chodarchay,Lohneh,Khalifelou和Goloujeh具有与超热部分相关的斑岩矿化的流体包裹体特征。塔罗姆(Tarom)的矿物质在某些中等和高硫化超热矿床下含有流体包裹体,表明斑岩矿化。

更新日期:2021-01-07
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