投稿时间：2011-03-31
修订日期：2012-02-11
中文摘要:赣南大富足花岗岩体位于南岭构造带北部,与武夷山构造带南段交汇处,为印支-燕山期复式花岗岩岩体。岩体西部的河草坑铀矿田是中国重要的铀矿田之一。大富足花岗岩基由小富足、上寮、赤泥、富城、草桃背5个岩体组成,均为富硅、贫铁镁、铝过饱和的钙碱性花岗岩,具有较高的铀背景值。岩体西部边缘有一长10 km、宽1 km的紫色蚀变带,其下为绿色蚀变带,铀矿体赋存于紫色带底部与绿色带界面上下。铀矿经过了花岗岩成矿阶段、火山岩成矿阶段和淋积叠加成矿阶段。文章通过分析基底地层、岩体特征、构造、区域蚀变及铀矿化控制因素等,总结了该区"铀源丰富、热源充足、构造发育、蚀变强烈、剥蚀适中"等5个有利铀成矿条件,在此基础上确定半岭及大坪山2处为最有远景的地段,分别位于岩体西部火山机构附近铀矿隐伏区及北部地堑区。
Abstract:Lying in the conjunction between northern Nanling tectonic belt and southern Wuyishan tectonic belt, Dafuzu massif belongs to Indosinian-Yanshanian period in age. In its western part, the Hecaokeng uranium orefield was recently discovery. As one of the most important uranium ore fields in China, the Hecaokeng uranium orefield consists of 7 uranium deposits and 20 uranium ore spots. The massif is composed of 5 granite plutons, namely Xiaofuzu, Shangliao, Chinie, Fucheng and Caotaobei, which are calc-alkali granites with rich silica, poor femic, oversaturated alumina and rich uranium. There exists a purple alteration zone 10 kilometers long and 1 kilometer wide within the western margin of the massif, beneath which is a green alteration zone. Uranium ore bodies are located near the interface between the two alteration zones. Based on an analysis of uranium ore-forming geological conditions in the study area such as regional geological background, pluton condition, tectonic framework, regional alteration and uranium characteristics, the authors hold that rich uranium backgrounds, plentiful thermal sources, well-developed structures, intense alterations and moderate erosions constitute the main favorable prospecting conditions in the massif. The direction of future work is pointed out, and two favorable targets for further uranium exploration are delineated. One is located in the buried EW-trending fractures beneath western Dafuzu massif near the volcanic apparatus, and the other lies in the NEE-trending graben-like downfaulted zone of northern Dafuzu massif. These results are of guiding significance in search for deep-seated uranium deposits in the ore district and similar areas.
keywords:geology granite body uranium property metallogenesis metallogenic condition potential target
文章编号：
中图分类号：P619.14
文献标志码：
基金项目:本文由国家科技部支撑计划项目(编号: 2009BAB43B04)、中央地质勘查基金项目(编号:2011360003)和江西省地勘基金项目(编号:20110211)联合资助
引用文本：
张运涛,张小平,裴荣富,陈永飞,倪修义,王浩琳,邱小平,于波.2012.赣南大富足花岗岩体西部铀成矿条件及找矿前景[J].矿床地质,31(2):369~379ZHANG YunTao,ZHANG XiaoPing,PEI RongFu,CHEN YongFei,NI XiuYi,WANG HaoLin,QIU XiaoPing,YU Bo.2012.Uranium metallogenic condition and ore-search prospect of western Dafuzu massif in southern Jiangxi Province[J].Mineral Deposits31(2):369~379
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