| 胶西北焦家断裂带深部载金黄铁矿标型特征研究及其地质意义 |
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| 引用本文：迟乃杰,韩作振,单伟,孙雨沁,熊玉新,舒磊,刘传娥,申颖,李增胜.2020.胶西北焦家断裂带深部载金黄铁矿标型特征研究及其地质意义[J].地球学报,41(6):949-962. |
| DOI：10.3975/cagsb.2020.070101 |
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| 作者 | 单位 | E-mail | | 迟乃杰 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室
山东科技大学地球科学与工程学院 | chinaijie@163.com | | 韩作振 | 山东科技大学地球科学与工程学院 | hanzz@163.com | | 单伟 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 孙雨沁 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 熊玉新 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 舒磊 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 刘传娥 | 山东省地矿工程勘察院 | | | 申颖 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | | | 李增胜 | 山东省地质科学研究院, 自然资源部金矿成矿过程与资源利用重点实验室,山东省金属矿产成矿地质过程与资源利用重点实验室 | |
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| 基金项目:国家重点研发计划(编号: 2016YFC0600606);山东省重点研发计划(编号: 2017CXGC1601);国家自然科学基金项目(编号: 41772076);山东省自然科学基金项目(编号: ZR2019PD019);省部级重点实验室开放课题(编号: kfkt201810) |
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| 中文摘要:胶东是我国最重要的金矿集中区, 焦家金矿带是区内最主要的金矿床分布区, 黄铁矿是焦家金矿成矿作用的贯通性矿物, 是主要的载金矿物之一。本次工作采集了焦家断裂带深部2700~3000 m内的矿体及矿化体样品, 对黄铁矿进行了晶体形态、主量元素、微量元素、EMPA面扫等研究工作。各个成矿阶段的黄铁矿晶体形态标型研究表明, 成矿I阶段黄铁矿自形-半自形, 颗粒较细小, 以细粒的立方体、五角十二面体为主; 成矿Ⅱ、Ⅲ阶段黄铁矿自形-半自形, 颗粒较粗大, 以立方体为主, 含少量五角十二面体, 具有较多的立方体、五角十二面体聚形晶; 成矿Ⅳ阶段黄铁矿主要以继承性的细粒立方体黄铁矿为主。各个成矿阶段的主、微量元素有显著的差异, 焦家深部成矿流体成矿早期Ⅰ阶段富Co、Ni, 贫Au, 成矿温度较高, 随着成矿作用的进行, 温度逐渐降低, 成矿Ⅱ阶段的成矿流体中含有一定量的伴生中温金属元素Ag、As、Te、Cu等, 成矿Ⅲ阶段中, 成矿温度进一步降低, 成矿流体逐渐转化为贫Co、Ni, 富Au及其伴生金属元素Ag、As、Te、Cu、Zn、Pb、Sb等。根据电子探针(EMPA)面扫描, 区分两种黄铁矿类型, Py1型黄铁矿, 富Co、Ni, 贫As、Pb等元素; Py2型黄铁矿, 主要为富As, 包裹部分被溶蚀的Py1型黄铁矿; 通过对焦家金矿带黄铁矿的晶体形态、主量元素、微量元素、EMPA面扫等标型特征进行详细研究, 对于深部找矿预测具有十分重要的意义。 |
| 中文关键词:焦家断裂带 3000 m深钻 黄铁矿 标型特征 |
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| Typomorphic Characteristics of Gold-bearing Pyrite in Jiaojia Fault Deep Zone of Northwest Jiaodong Peninsula and Its Geological Significance |
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| Abstract:Jiaodong is the most important gold ore concentration area in China. The Jiaojia gold belt is the most important gold ore zone in this area. Pyrite, as one of the main gold-bearing minerals, was a common and penetrating mineral during gold mineralization process in the Jiaojia gold belt. In this study, samples of ores and mineralized bodies were collected at the depths from 2700 to 3000 m in Jiaojia fault zone, and the study of crystal morphology as well as major and trace element content of pyrite was carried out with EMPA surface scanning. According to the typomorphic features of pyrite at various mineralization stages, the pyrite at stage I occurs as euhedral to subhedral crystals, composed mainly of fine-grained cubes and pentagonal dodecahedrons; the pyrite formed at stages II and Ⅲ occurs as coarse-grained euhedral to subhedral crystals, mainly as cubes and a small amount of pentagonal dodecahedrons, as well as glomercrysts composed of more cubes and pentagonal dodecahedrons; the pyrite formed at stage IV is composed mainly of inherited fine-grained cubic pyrite. It is suggested that there is a significant difference in major and trace element content of the ore-forming fluids responsible for the Jiaojia deep orebodies for individual mineralization stages. At the early stage, the ore-forming fluid was rich in Co and Ni and poor in Au, while the temperature of the ore-forming fluid was higher. At the second stage, as the mineralization process progressed, the temperature gradually decreased and the ore-forming fluid contained certain amounts of associated metal elements such as Ag, As, Te and Cu. At the third mineralization stage, the temperature further decreased, and the ore-forming fluid was gradually turned into the fluid poor in Co and Ni but rich in Au and its associated metal elements such as Ag, As, Te, Cu, Zn, Pb and Sb. According to the electron microprobe analysis (EMPA) with surface scanning technique for pyrite samples, two types of pyrite were distinguished: type I pyrite (Py1) is rich in Co, Ni but poor in As, Pb and other elements, whereas type II pyrite (Py2), which sometimes surrounded eroded Py1, was mainly rich in As. Detailed studies of the typomorphic characteristics such as crystal forms as well as major and trace element content of pyrite in the Jiaojia gold deposit with EMPA surface scanning technique are of great significance for deep prospecting and prediction of gold deposits. |
| keywords:Jiaojia fault zone 3000 m deep drilling pyrite scalar feature |
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