秘鲁阿雷基帕省阿蒂科铁氧化物铜金矿床成矿流体特征及来源

Characteristics and sources of ore-forming fluids in the Atico IOCG deposit, Arequipa, Peru

摘要: 秘鲁阿蒂科矿床是一个铁氧化物铜金矿床。含矿石英脉的流体包裹体均一温度为107~389℃，盐度为2.2%~23.18% NaCl。均一温度数据呈近似正态分布，但是，盐度数据总体不呈正态分布，且盐度较低，主要集中于0~10% NaCl和20%~30% NaCl之间。矿床δD_V-SMOW和δ¹⁸O_H2O的组成投影点靠近雨水线，反映该矿床成矿流体为大气降水来源。

Abstract: The Atico deposit is an IOCG deposit. Homogenization temperature of fluid inclusions in quartz varies from 107℃ to 389℃. The salinity range is 2.2%~23.18% NaCl. The homogenization temperatures are approximately in normal distribution, whereas the salinities are not in normal distribution and low, being mainly concentrated on 0~10%NaCl and 20%~30%NaCl. The fact that subpionts of δD_V-SMOW and δ¹⁸O_H2O of samples in the deposit suggests that the ore-forming fluids were mainly derived from atmospheric precipitation.