Sulfur isotope geochemistry of the Chodarchay Cu-Au deposit, Tarom, NW Iran

IF 0.5 4区地球科学 Q4 MINERALOGY

Neues Jahrbuch Fur Mineralogie-Abhandlungen Pub Date : 2018-08-01 DOI:10.1127/NJMA/2018/0097

N. Yasami, M. Ghaderi, P. Alfonso

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引用次数: 11

Abstract

The Chodarchay porphyry–high-sulfidation epithermal Cu-Au deposit in the Tarom subzone of the western Alborz structural zone of NW Iran is related to quartz-monzonite and alkali-granite intrusions that were emplaced within the volcanic-volcaniclastic rocks of Karaj Formation during Tertiary. The Chodarchay deposit formed as a high-sulfidation epithermal overprint on porphyry type mineralization. The mineralization occurred as stockwork, dissemination, veinlet, open space filling and breccias. Chalcopyrite, pyrite, sphalerite, and galena are the main sulfide minerals in the area. The sulfur isotope composition of sulfide minerals from the Chodarchay deposit is positive, ranging from 0.2 to 6.8 ‰. The sphalerite-galena isotope geothermometer shows 360 °C for the crystallization temperature. Sulfur was sourced from a homogeneous magma, and its isotopic composition decreases with depth and temperature decreasing due to fluid oxidation changes. Therefore, sulfur isotope assemblages show a systematic spatial distribution within the Chodarchay system.

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伊朗Tarom Chodarchay铜金矿床硫同位素地球化学特征

伊朗西北部Alborz构造带西部Tarom亚带的chdarchay斑岩-高硫化浅成热液型铜金矿床与第三纪Karaj组火山-火山碎屑岩中的石英-二长岩和碱花岗岩侵入岩有关。查达察矿床是在斑岩型成矿作用上形成的高硫化浅成热液覆印矿床。成矿形式有网状、浸染状、脉状、空地充填和角砾岩。黄铜矿、黄铁矿、闪锌矿、方铅矿是该区主要的硫化物矿物。恰达尔察矿床硫化物矿物硫同位素组成为正，在0.2 ~ 6.8‰之间。闪锌矿-方铅矿同位素地温计显示结晶温度为360℃。硫来源于均质岩浆，其同位素组成因流体氧化变化而随深度和温度的降低而降低。因此，硫同位素组合在恰达恰采体系内具有系统的空间分布。

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来源期刊

Neues Jahrbuch Fur Mineralogie-Abhandlungen 地学-矿物学

CiteScore

0.90

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： Neues Jahrbuch für Mineralogie (Abhandlungen) publishes thorough, detailed studies of up to 30 printed pages as well as short and concise papers and notes (less than 15 printed pages) on mineralogy, i.e. crystallography, crystal chemistry, petrology, geochemistry and economic mineralogy (mineral deposits). All fields of mineralogy: crystallography, crystal chemistry, petrology, geochemistry and economic mineralogy (mineral deposits).