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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第5期    总第285期    2018年5月

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文章编号:1672-7207(2018)05-1148-12
西天山阿希金矿床黄铁矿微量元素LA-ICP-MS原位测试及其指示意义
毛先成1, 2,潘敏1, 2,刘占坤1, 2,汪凡云1, 2,邓浩1, 2, 韩建民3,樊红喜3,夏芳1, 2,肖飞3,魏清峰3,三金柱3

(1. 中南大学 有色金属成矿预测与地质环境监测教育部重点实验室,湖南 长沙,410083; 2. 中南大学 地球科学与信息物理学院,湖南 长沙,410083; 3. 新疆有色金属工业(集团)有限责任公司,新疆 乌鲁木齐,830000)

摘 要: 阿希金矿床是新疆西天山地区典型的低硫型浅成低温热液矿床。以阿希金矿床中的黄铁矿作为研究对象,在黄铁矿显微结构研究的基础上,利用LA-ICP-MS对黄铁矿的微量元素进行原位分析。研究结果表明:阿希金矿床的黄铁矿从早到晚依次划分为4个世代,分别是中粗粒压碎状黄铁矿(PyⅠ)、中细粒自形黄铁矿(PyⅡ)、中粗粒锯齿状黄铁矿(PyⅢ)和细粒黄铁矿(PyⅣ);该矿床黄铁矿具富As,Sb和Ni,贫Te和Se的特点,Co与Ni的质量分数之比即w(Co)/w(Ni)绝大多数小于1,反映出矿床的成矿温度较低;黄铁矿中As,Sb,Co和Ni多以类质同象的形式存在;Au和Ag在PyⅡ中多以银金矿包裹体的形式存在,PyⅢ中则多以自然金和自然银的形式存在;Pb,Cu和Zn则多以包裹体的形式存在。推测PyⅠ可能形成于早期火山热液与大气降水流体叠加改造的热液环境,而PyⅡ和PyⅢ形成于以大气降水为主的热液环境。

 

关键字: LA-ICP-MS;黄铁矿;微量元素;阿希金矿;浅成低温热液

LA-ICP-MS trace element analysis of pyrite from Axi gold deposit in western Tianshan and its significance
MAO Xiancheng1, 2, PAN Min1, 2, LIU Zhankun1, 2, WANG Fanyun1, 2, DENG Hao1, 2, HAN Jianmin3, FAN Hongxi3, XIA Fang1, 2, XIAO Fei3, WEI Qingfeng3, SAN Jinzhu3

1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Changsha 410083, China; 2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China; 3. Xingjiang Nonferrous Metal Industry (Group) Co. Ltd., Urumqi 830000, China

Abstract:The Axi gold deposit in the western Tianshan is a typical low-sulfidation epithermal deposit. Based on the study of pyrite microstructure, the trace elements of the pyrite were analyzed by LA-ICP-MS. The results show that pyrite is divided into four generations in succession, i.e. coarse crushing like pyrite (PyⅠ), fine-grained euhedral pyrite (PyⅡ), coarse serrated pyrite (PyⅢ) and fine-grained pyrite (PyⅣ). The pyrite is rich in As, Sb and Ni, and is poor in Te and Se, and the majority of w(Co)/w(Ni) is less than 1,which reflects the low metallogenic temperature of the deposit. As, Sb, Co and Ni in the pyrite are mostly in the form of homo-isomorphs, Au and Ag probably occur as electrum inclusions in the PyII. However, Au and Ag occur as the microscopic-gold and free-silver in the PyⅢ, and Pb, Cu and Zn are mostly in the form of inclusions. PyⅠoriginates from the common action of the hydrothermal fluids and the meteoric water fluids, while PyⅡand PyⅢ form in the process of circulating meteoric water fluids.

 

Key words: LA-ICP-MS; pyrite; trace element; Axi gold deposit; epithermal

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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