首页|粤北铀矿控矿断裂活动年代学特征与找矿规律——以南雄断裂带为例

粤北铀矿控矿断裂活动年代学特征与找矿规律——以南雄断裂带为例

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为研究粤北地区铀矿控矿断裂活动特征和控矿规律以指导找矿,以南雄盆地北缘南雄断裂带为研究对象,通过野外地质剖面调查、LA-ICP-MS锆石U-Pb年代学研究和显微构造变形分析,讨论南雄断裂带活动特征和铀矿找矿规律.研究结果表明:南雄盆地北缘南雄断裂带在三叠纪的构造变形特征以韧性变形为主,岩浆期后热液石英脉和长英质脉于晚三叠世交切断裂带内花岗质糜棱岩和糜棱岩化花岗岩,脉体锆石 U-Pb 加权平均年龄分别为(230.2±1.7)Ma、(228.9±5.8)Ma和(210.0±2.1)Ma;断裂带内发育典型韧性变形显微构造特征,韧性变形运动特征以左行剪切为主,且具有高温变形和中低温变形 2 个阶段.认为南雄盆地北缘南雄断裂带内 210 Ma韧性变形区段不具备铀矿质沉淀的临界转换成矿机理条件,推断125～120 Ma和110～105 Ma韧性变形强烈并叠加同期区域伸展运动、基性岩脉侵入和铀矿化特征的区段可能是铀成矿有利区段.分析结果为进一步提高诸广山南部整装勘查区铀资源量提供了可行的找矿思路和有效的铀矿查证区段.
Chronological Characteristics and Prospecting Regularity of Ore-controlling Fault Activities in Uranium Mines in Northern Guangdong Province:Take the Nanxiong Fault Belt as an Example
In order to study the characteristics of ore-controlling fault activities and ore-controlling laws in uranium mines to guide mineral exploration in northern Guangdong Province,the Nanxiong Fault Belt in the northern Margin of the Nanxiong Basin is taken as the research object,and the characteristics of the Nanxiong Fault Belt activities and the prospecting regularity of uranium mines have been discussed through researches on field geological sections,LA-ICP-MS zircon U-Pb chronology and characteristics of microstructural deformation.The research results show that the features on tectonic deformation of the Nanx-iong Fault Belt in Triassic are mainly ductile deformation,and the post-magmatic hydrothermal quartz veins and felsic dikes in the Late Triassic cut through granitic mylonite and mylonite granite.Their weighted average ages of zircon U-Pb isotopic analy-sis are respectively(230.2±1.7)Ma,(228.9±5.8)Ma and(210.0±2.1)Ma.The microstructural characteristics of granitic mylonite and mylonite granite in the Nanxiong Fault Belt have show typical ductile deformation phenomenons with"S-C"fab-ric,elongation and dynamic recrystallization of quartz,"σ"type rotational fragmentation of quartz and book oblique structure of plagioclase feldspar.These characteristics of microstructural movement mainly present left-row shear in the direction of ductile deformation.In Triassic,two stages of elevated-temperature deformation and medium-low temperature deformation have been re-vealed.It is considered that these areas of 210 Ma ductile deformation in Nanxiong Fault Belt do not have the conditions of ore-forming mechanism of critical transformation for precipitation of uranium mines.These is a inferential conclusion that the areas,in which the granites experienced strong ductile deformation in 125～120 Ma and 110～105 Ma,regional extensional movement of the same period and had been accompanied by intrusion of mafic dykes and uranium mineralization,can become metallogenic prospective areas of uranium mineralization or depositing uranium mines.This analysis results provide new ideas about ap-praisement of uranium mines and feasible prospecting for further improving the uranium resources in the integrated exploration area of southern Zhuguang Mountain.

uranium mineNanxiong Fault Beltductile deformationelectron backscattered diffractionzircon U-Pb chro-nologyprospecting regularity

赵佳楠、刘冲昊、邱际玮、苏宏亮、崔永春、曾凡杰

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广东省核工业地质局二九一大队,广东 广州 510800

广东省地质局,广东 广州 510080

中国地质科学院矿产资源研究所,北京 100037

铀矿 南雄断裂带 韧性变形 电子背散射衍射 锆石U-Pb年代学 找矿规律

中国地调局发展研究中心(自然资源部矿产勘查技术指导中心)基金中国地调局发展研究中心(自然资源部矿产勘查技术指导中心)基金中国地调局发展研究中心(自然资源部矿产勘查技术指导中心)基金中国地调局发展研究中心(自然资源部矿产勘查技术指导中心)基金

121201004000150017-65121201004000160901-77121201004000172201-61DD20190159-10

2024

10.19614/j.cnki.jsks.202403021

金属矿山
中钢集团马鞍山矿山研究院 中国金属学会

金属矿山

CSTPCD北大核心
影响因子：0.935
ISSN：1001-1250
年,卷(期)：2024.(3)
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