| 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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| 关键词:Jiaojia fault zone 3000 m deep drilling pyrite scalar feature |
| 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) |
| 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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| Typomorphic Characteristics of Gold-bearing Pyrite in Jiaojia Fault Deep Zone of Northwest Jiaodong Peninsula and Its Geological Significance |
| 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. |
| CHI Nai-jie,HAN Zuo-zhen,SHAN Wei,SUN Yu-qin,XIONG Yu-xin,SHU Lei,LIU Chuan-e,SHEN Ying,LI Zeng-sheng.2020.Typomorphic Characteristics of Gold-bearing Pyrite in Jiaojia Fault Deep Zone of Northwest Jiaodong Peninsula and Its Geological Significance[J].Acta Geoscientica Sinica,41(6):949-962. |
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