e-Article
渗出砂岩型铀矿成矿预测与找矿标志 / Metallogenic Prediction and Exploration Indication of Exudative Sandstone-Type Uranium Deposit
Document Type
Academic Journal
Author
李子颖; 秦明宽; 郭庆银; 贺锋; 蔡煜琦; 钟军; 刘武生; 邱林飞; 刘持恒; 纪宏伟; 郭建; 林锦荣; 李西得; 田明明; 黄志新; 衣龙升; 王君贤; 刘鑫扬; 李伟涛; 张云龙; 何升; 张字龙; 郭强; 欧光习; 贾立城; 何中波; 吴玉; 邢作昌; 王文全; 刘军港; 韩美芝; 骆效能; LI Ziying; QIN Mingkuan; GUO Qingyin; HE Feng; CAI Yuqi; ZHONG Jun; LIU Wusheng; QIU Linfei; LIU Chiheng; JI Hongwei; GUO Jian; LIN Jinrong; LI Xide; TIAN Mingming; HUANG Zhixin; YI Longsheng; WANG Junxian; LIU Xinyang; LI Weitao; ZHANG Yunlong; HE Sheng; ZHANG Zilong; GUO Qiang; OU Guangxi; JIA Licheng; HE Zhongbo; WU Yu; XING Zuochang; WANG Wenquan; LIU Jungang; HAN Meizhi; LUO Xiaoneng
Source
铀矿地质 / Uranium Geology. 40(1):1-15
Subject
Language
Chinese
ISSN
1000-0658
Abstract
文章基于渗出砂岩型铀矿成矿机理和模式,认为渗出砂岩型铀成矿作用不同于渗入砂岩型铀矿成矿作用,其成矿预测和找矿标志也不同;提出了渗出砂岩型铀矿成矿作用两大基本关键条件识别标志:红杂色含矿建造原生成因和其中控矿灰色砂体的后生成因识别;在提出的红杂色沉积建造中渗出砂岩型铀矿"上红下黑、上下连通、红中找灰、灰中找矿"总体找矿新思路基础上,阐明渗出砂岩型铀成矿区域预测评价条件和标志:深部富铀富有机质沉积岩建造、区域构造、区域建造、放射性异常信息和综合预测标志等,提出并阐述"小凹陷成大矿"条件;系统建立渗出砂岩型铀矿床预测定位标志体系,特别是野外可识别的宏观标志,包括控矿构造、沉积建造、蚀变改造、铀矿化砂岩颜色、外来有机质特征等,并对比了渗入和渗出砂岩型铀成矿预测标志.提出的渗出砂岩型铀矿识别标志体系不仅对区分"渗入"和"渗出"两种矿化成因,而且对厘清控矿要素、指导成矿预测和找矿工程部署具有重要意义和价值.
Based on the innovative mechanism and model of exudative sandstone-type uranium deposit,it is considered that the exudative metallogeny is different from infiltrating one and has different signatures and indications.Two key conditions should be firstly identified:one is the primary origin of uranium-bearing red-mottled sedimentary formation,the other one is the secondary reduction origin of ore-controlling grey sandstone body within the formation.The new targeting methods used to identify uranium mineralization in red-mottled sandstone pointed out:(1)combining information derived from the upper red and lower dark sedimentary formations,(2)identifying the pathways connecting the upper red formation with lower dark formation,and(3)finding the grey-greenish sandstone units in red-mottled formation,which hosts uranium mineralisation.Furthermore,this paper clarifies the conditions and indications for the regional prediction and evaluation,including presence of uranium-and organic matter-rich source rocks below the ore-bearing beds,regional structures,sedimentary formation,radioactive anomalies,and comprehensive predictive techniques.It is also pointed out that a small-sizeed depression can produce a large deposit.In addition,systematic predictive indications for exudative sandstone-type uranium deposits have been concluded,particularly easy macroscopic ones in the field work,such as ore-controlling structures,sedimentary configurations,alteration and modification,the color of uranium-mineralized sandstone and the characteristics of external organic matter.To be understood better,those indications are compared with traditional ones related to infiltrative sandstone uranium mineralization system.The established conditions and indications are not only of very significace to identify the origins of both"infiltration"and"exudation"metallogenies,but also with great values to clarify key ore-controlling factors,guide metallogenic prediction and exploration for the uranium deposits.
Based on the innovative mechanism and model of exudative sandstone-type uranium deposit,it is considered that the exudative metallogeny is different from infiltrating one and has different signatures and indications.Two key conditions should be firstly identified:one is the primary origin of uranium-bearing red-mottled sedimentary formation,the other one is the secondary reduction origin of ore-controlling grey sandstone body within the formation.The new targeting methods used to identify uranium mineralization in red-mottled sandstone pointed out:(1)combining information derived from the upper red and lower dark sedimentary formations,(2)identifying the pathways connecting the upper red formation with lower dark formation,and(3)finding the grey-greenish sandstone units in red-mottled formation,which hosts uranium mineralisation.Furthermore,this paper clarifies the conditions and indications for the regional prediction and evaluation,including presence of uranium-and organic matter-rich source rocks below the ore-bearing beds,regional structures,sedimentary formation,radioactive anomalies,and comprehensive predictive techniques.It is also pointed out that a small-sizeed depression can produce a large deposit.In addition,systematic predictive indications for exudative sandstone-type uranium deposits have been concluded,particularly easy macroscopic ones in the field work,such as ore-controlling structures,sedimentary configurations,alteration and modification,the color of uranium-mineralized sandstone and the characteristics of external organic matter.To be understood better,those indications are compared with traditional ones related to infiltrative sandstone uranium mineralization system.The established conditions and indications are not only of very significace to identify the origins of both"infiltration"and"exudation"metallogenies,but also with great values to clarify key ore-controlling factors,guide metallogenic prediction and exploration for the uranium deposits.