| 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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| 引用本文：孙雨沁,于学峰,单伟,熊玉新,张岩,迟乃杰,舒磊,李敏,程伟.2020.胶东焦家断裂带3000 m深部矿化特征及金矿物赋存状态[J].地球学报,41(6):919-937. |
| DOI：10.3975/cagsb.2020.070201 |
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| 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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| 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) |
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| 中文摘要:胶东是我国黄金的主要产地, 前人已开展大量矿床学研究, 但主要集中在浅部, 其深部的成矿研究仍然薄弱。本文以目前最深的见矿钻孔为研究对象, 在宏观观察描述的基础上, 以电子探针为主要研究方法, 在微观上系统开展深部金矿的矿相学和元素地球化学研究, 为深部金矿成矿特征提供了第一手的基础资料, 研究结果对于深入认识焦家金矿带矿床的成因以及进一步的深部找矿预测都具有重要意义。超深科研钻ZK01井位于莱州吴一村地区, 是目前焦家断裂带最深的见矿钻孔, 也是我国岩金最深见矿孔。深钻蚀变类型主要有钾化、硅化、黄铁矿化、绢英岩化、黄铁绢英岩化、绿泥石化和碳酸盐化, 矿石类型为黄铁绢英岩化碎裂岩和黄铁绢英岩化花岗质碎裂岩, 矿体多以脉状、细脉网脉状、细脉浸染状为主。载金矿物主要为黄铁矿, 少数金矿物分布在黄铜矿、石英和钾长石中。焦家带深部矿石金矿物成色较高, 主要为含银自然金, 其次为银金矿, 说明该深钻深部金矿形成于高温、较深的成矿环境; 成矿时代相对较老。Au主要有两种赋存形式: 独立的金矿物和不可见金即晶格金。独立金矿物可分为三种赋存状态, 即包体金、裂隙金和晶隙金。初步认为矿石矿物生成顺序从早到晚依次为: (不含Pb黄铁矿、方铅矿、辉铋矿、金矿物)→(黄铜矿)→(含Pb黄铁矿)→(方铅矿、金矿物)→(重晶石)→(闪锌矿)。深钻成矿热液存在多期活动, 碎裂岩带为含金热液运移提供了通道, 多重成矿阶段的叠加和复合导致金矿物多期次结晶。 |
| 中文关键词:焦家断裂带 超深科研钻 EPMA 金矿 赋存状态 胶东 |
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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 |
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| Abstract: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. |
| keywords:Jiaojia fault zone scientific research deep drilling EPMA gold deposit modes of occurrence Jiaodong |
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