| 王 涛.滇东南富宁地区“半瓦型”辉绿岩地球化学特征及其与金矿成矿关系[J].地质与勘探,2021,57(4):895-909 |
| 滇东南富宁地区“半瓦型”辉绿岩地球化学特征及其与金矿成矿关系 |
| Geochemical characteristics of "half-tile type" diabase in the Funing area of southeastern Yunnan and its relationship with gold mineralization |
| 投稿时间：2020-12-09 修订日期：2021-04-25 |
| DOI：10.12134/j.dzykt.2021.04.014 |
| 中文关键词: 辉绿岩 地球化学特征 金矿 富宁地区 滇东南 |
| 英文关键词: diabase, geochemical characteristics, gold deposit, Funing area, southeastern Yunnan |
| 基金项目:云南省地质勘查基金项目“云南省1∶5万花甲那能砂斗者桑矿产地质调查”（项目编码：D201704）资助 |
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| 中文摘要: |
| 滇东南富宁地区地处扬子陆块西南缘，区内分布有多个以“半瓦型”辉绿岩为容矿岩石的卡林型金矿床(点)，即金矿体产于不同规模辉绿岩体的内接触带，以及岩体内部的同生张性裂隙中。通过对新鲜辉绿岩(成矿前)的主量、微量及稀土元素特征进行研究，表明其属于亚碱性玄武岩系列，具有板内玄武岩的地球化学特征；对其构造环境进行判别并结合区域构造演化特征，表明辉绿岩为印支期碰撞造山运动后基性岩浆沿区域断裂上升侵入的产物。在野外调查的基础上，与前人对含矿辉绿岩地球化学特征的研究进行对比分析，结合辉绿岩的成岩时代、以辉绿岩为容矿岩石的金矿床成矿时代，综合分析认为：辉绿岩浆为此类金矿床的形成提供了部分成矿物质，为成矿流体提供了热源，同时活化、萃取地层中的金元素，在有利的构造部位富集成矿。 |
| 英文摘要: |
| The Funing area in southeast Yunnan Province is located in the southwest margin of the Yangtze block. There are several Carlin-type gold deposits (spots) hosted in "half-tile type" diabase in this region, that is, the gold orebodies occur in the inner contact zone of diabase rocks of different sizes and syngenetic tensile fractures in rocks. The major, trace and rare earth elements of fresh diabase (pre-mineralization) are studied. The results show that the diabase belongs to subalkaline basalt series and has the geochemical characteristics of intraplate basalt. By discriminating the tectonic setting and combining with the characteristics of regional tectonic evolution, the diabase is the product of the basic magma ascending and intruding along regional faults after the collision orogeny in the Indosinian period. On the basis of field investigations, in combination with the diagenetic age of diabase and the metallogenic age of gold deposits in which diabase is the host rock, this paper makes a comparative analysis with previous studies on the geochemical characteristics of ore bearing diabase. The comprehensive analysis suggests that the diabase magma provided part of ore-forming materials for the formation of such gold deposits and heat source for ore-forming fluids. At the same time, it activated and extracted gold element in the strata which enriched to form ore at favorable structural positions. |
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