| 胶东焦家断裂带3000 m深部矿化特征及金矿物赋存状态 |
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| 关键词:Jiaojia fault zone scientific research deep drilling EPMA gold deposit modes of occurrence Jiaodong |
| 基金项目:国家重点研发计划项目“穿透性地球化学勘查技术”(编号: 2016YFC0600606);山东省重点研发计划(编号: 2017CXGC1601);山东省自然科学基金项目(编号: ZR2019PD019; ZR2019PD005) |
| 作者 | 单位 | E-mail | | 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 | sunyuqin86@163.com | | 于学峰 | 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 | xfengy@sohu.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 | | | 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 | | | 张岩 | 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 | | | 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 | | | 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 | | | 李敏 | 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 | | | 程伟 | 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 | |
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| Mineralization Characteristics and Modes of Occurrence of Gold Minerals at the Depth of 3000 Meters in Jiaojia Fault Zone, Jiaodong Peninsula |
| Jiaodong is an important gold producing area in China, and lots of ore deposit studies have been carried out in the past years. However, most studies have been mainly concentrated on the shallow part, and the ore-forming research in the depth is still weak. Based on macroscopic observation and electron microprobe analysis, the authors used mineragraphy and elemental geochemistry to study deep gold deposits, and provided first-hand basic information for the metallogenic characteristics of the deep gold deposits. The research results are of great significance for further understanding the genesis of the Jiaojia gold deposit and the prediction of deep prospecting. Scientific Research Deep Drilling ZK01 drill hole is located in Wuyicun, Laizhou, which is the deepest ore drill hole in Jiaojia fault zone and also the deepest ore drill hole in China. In this paper, the characteristics of deep drilling mineralization and the modes of occurrence of gold were studied by means of mineralogy, EPMA and EDS. The main alteration types of deep drilling alteration include feldspathization, silicification, pyritization, phyllic alteration, pyritic-phyllic alteration, chloritization and calcitization. The ore types are pyritic-phyllic altered cataclasite and pyritic-phyllic altered granitic cataclasite. The mineral body is mainly of vein style, veinlet network vein style and veinlet disseminated style. The main gold-carrying mineral is pyrite, with minor gold minerals distributed in chalcopyrite, quartz and K-feldspar. In the deep part of Jiaojia belt, the gold purity is quite higher, and the major gold mineral is silver-bearing native gold, followed by electrum. It is shown that the deep gold deposit was formed in an high temperature and deep metallogenic environment, and the metallogenic age is relatively old. There are two main forms of gold occurrence: independent gold mineral and invisible gold. The invisible gold here is lattice gold. The independent gold minerals have three kinds of modes of occurrence: second inclusion gold, crack-gold and crystal interface-gold. The sequence of ore mineral formation is as follows: (lead free pyrite, galena, bismuthinite, gold mineral)→(chalcopyrite)→(pyrite with lead)→(bismuthinite, gold mineral)→(barite)→(sphalerite). There are multi-stage activities in the hydrothermal solution of deep drilling hole and mineralization. The cataclastic zone provided a channel for the migration of gold- bearing hydrothermal solution. The superposition of multiple mineralization stages led to multi-stage crystallization of gold deposits. |
| SUN Yu-qin,YU Xue-feng,SHAN Wei,XIONG Yu-xin,ZHANG Yan,CHI Nai-jie,SHU Lei,LI Min,CHENG Wei.2020.Mineralization Characteristics and Modes of Occurrence of Gold Minerals at the Depth of 3000 Meters in Jiaojia Fault Zone, Jiaodong Peninsula[J].Acta Geoscientica Sinica,41(6):919-937. |
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