江西九瑞地区铜金成矿的时空结构及演化  

Spatial-temporal structure and its evolution of copper-gold mineralizationin Jiujiang-Ruichang area, Jiangxi Province

作　　者：所颖萍[1,2] 陈志洪 匡福祥 曾勇 陆建军[1] 

机构地区：[1]南京大学地球科学与工程学院,南京210093 [2]南京地质调查中心,南京210016

出　　处：《资源调查与环境》2013年第2期102-108,共7页Resources Survey & Environment

基　　金：中国地质调查局地质矿产调查评价项目<长江中下游成矿带基础地质综合研究>(项目编号:1212011085420);<江西九江大城门一仙姑台铜多金属矿远景调查>(项目编号:1212011085438)

摘　　要：九瑞铜金多金属矿区是长江中下游成矿带的重要组成部分。近几年该区的深部铜金找矿工作取得重要进展,成矿研究从与斑岩有关的似层状矽卡岩型、斑岩型"三位一体"铜矿床模式进一步发展为铜钼叠合"多位一体"矿床模式。本区的成矿时空结构表现为:区域上受中石炭系黄龙组赋矿层位影响;垂深上存在多层分布结构,地表呈带状分带结构;成矿受"四带一面"制约。利用多种测年技术获得的九瑞矿集区内含矿岩浆岩锆石U-Pb年龄均介于140～146 Ma之间,成矿年龄在其稍后1～3 Ma。大规模成矿作用发生在中国东部由EW向构造向NE-NNE向构造彻底转换之际,形成于岩石圈大规模拆沉的构造背景。The copper polymetallic ore district in Jiujiang-Ruichang area is one of the major sections in the middle and lower Yangtze metallogenic belt. Prospecting works have made important progress for deep-seated copper-gold deposits in recent years, and studies on mineralization have further developed from trinity type model for stratiform-like porphyry, skarn-type and porphyry-type copper deposits genetically related to porphyries to multi-type model for copper-molybdenum superimposed deposits. The spatial-temporal structure of the mineralization is manifected by the regional influence of the ore-hosting position of middle- Carboniferous Huanglong Group, exhibiting as multiple structures in vertical extent and banded structures in horizontal plane, and the mineralization was controlled by ＂four-zones and one surface＂. The zircon U- Ph isotopic dating of ore-bearing magmatic ricks in the Jiujiang-Ruichang area yielded ages of 140 Ma to 146 Ma, and the mineralization ages are about 1-3 Ma later. Large-scale mineralization occurred in the period of complete conversion from EW-trending structure to NE-NNE-trending structure, forming in the tectonic background of large-scale lithosphere delamination.

关 键 词：九瑞地区 铜金矿床 成矿年龄 成矿演化 

分 类 号：P612[天文地球—矿床学]