相山西部鹏姑山—平顶山地区铀成矿地质条件及找矿方向探讨  

Geological conditions and prospecting direction of uranium deposit in Penggushan-Pingdingshan area,western Xiangshan

作　　者：方启春 魏欣 党飞鹏 吕川 FANG Qichun;WEI Xin;DANG Feipeng;LYU Chuan(Research Institute No.270,CNNC,Nanchang 330200,China)

机构地区：[1]核工业二七〇研究所,江西南昌330200

出　　处：《世界核地质科学》2024年第3期462-471,共10页World Nuclear Geoscience

基　　金：核工业地质局“江西省相山矿田及邻区铀矿资源调查评价与勘查”项目(编号:202229)资助。

摘　　要：鹏姑山—平顶山地区位于相山矿田西部EW向河元背—凤岗基底断陷带与NE向邹—石断裂构造带的交汇部位,处在邹家山矿床4号矿带南西延伸段。近年来,该区铀矿找矿取得较大进展,揭露丰富深部地质信息,十分有必要进一步总结该区成矿地质条件,为后续铀矿勘查提供指导。勘查资料分析表明:鹏姑山—平顶山地区深部发育有陡变的火山岩组间界面;邹—石断裂带F6主断裂和平顶山断裂延伸深度大,切穿火山岩组间界面,其旁侧次级裂隙也非常发育;热液蚀变主要发育在邹—石断裂带和平顶山断裂附近,蚀变期次多、幅度大;地表多种物化探异常信息丰富,断裂带旁侧次级裂隙和深部火山岩组间界面附近均发现了较好的铀矿化,多期次蚀变叠加部位发现有富矿石。分析认为:研究区具备有利的铀成矿地质条件,利用相山西部断裂与火山岩组间界面复合控矿的找矿模式,提出邹—石断裂带上盘旁侧次级裂隙带和F6主断裂深部与火山岩组间界面复合部位、平顶山断裂下盘及其深部与火山岩组间界面复合部位是有利的找矿部位。Penggushan-Pingdingshan sector,situated at the intersection of Heyuanbei-Fenggang E-Wtrending fault and Zou-Shi fault,is part of the southwestern extension of Zone 4 of Zoujiashan metallogenic belt.Recently,great potential has been discovered in the depth of the deposit,and a comprehensive review of the metallogenic geological conditions hence need to be conducted.This paper analyzed and examined the exploration data and revealed the steep volcanic interfaces at depth in the area.The main fault F6 and Pingdingshan fault,both within Zou-Shi fault belt,extend deeply,which traverse the lithologic interfaces and develop extensive secondary fault and fractures.Hydrothermal alteration is predominantly observed in Zou-Shi fault and the vicinity of Pingdingshan fault,with alteration intensity increasing from shallow to deep,affecting a longer duration.Abound surface geophysical and geochemical anomalies indicated favorable conditions for uranium mineralization.High-grade mineralization is often associated with secondary fractures beside the fault zones and deep volcanic rock interfaces,as well as the overlap of multiple alteration stages.Based on the fault and volcanic interface exploration model,prospective areas were predicted which include the upper wall of secondary fracture zone of Zou-Shi fault,the deep portion of the fault F6,volcanic group interfaces,and the footwall of Pingdingshan fault,beside the deep volcanic rock interface.

关 键 词：铀成矿条件 找矿方向 鹏姑山—平顶山 相山矿田 

分 类 号：P619.14[天文地球—矿床学] P59[天文地球—地质学]