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粤北青嶂山岩体江头矿区铀矿微区矿物学、年代学特征及其成矿动力背景制约
投稿时间:2019-01-04  修订日期:2019-04-17  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2019176
摘要点击次数: 396
全文下载次数: 160
作者单位E-mail
赖静 核工业二九〇研究所 jinglai1994@163.com 
祁家明 核工业二九〇研究所 jiaming_qi@126.com 
陈军军 核工业二九〇研究所  
李钟枢 核工业二九〇研究所  
曹豪杰 核工业二九〇研究所  
基金项目:中国地质调查局“全国重要矿集区找矿预测”项目(编号:DD2016005209);中核集团集中研发项目(编号:地LTD1602);中国核工业地质局科研项目(编号:201639、201836);中国核工业地质局铀矿勘查专项基金项目(编号:201926)
中文摘要:粤北诸广、贵东岩体是华南重要的花岗型铀矿集区,而青嶂山(龙源坝)岩体位于诸广、贵东岩体之间,是华南铀矿研究的薄弱地区。江头铀矿区位于青嶂山岩体北部与南雄断陷盆地结合部位,其铀矿年代学研究几为空白。本文以电子探针方法研究了青嶂山岩体、及与该岩体密切相关的江头矿区中的铀矿微区矿物学特征,计算了岩浆成因晶质铀矿与热液成因沥青铀矿的化学年龄,探讨了华南铀成矿动力学背景及成矿地质体。研究表明:青嶂山岩体的铀矿物主要有晶质铀矿、铀石,部分晶质铀矿存在明显铀释放的特征,其晶质铀矿化学年龄分别为246.8±8.8Ma、161.5±8.0Ma,与前人锆石U-Pb年龄结果在误差范围内一致,分别代表了区内印支期与燕山期花岗岩体的成岩年龄,表明在南雄断陷盆地形成之前,青嶂山岩体与诸广岩体可能为一有机整体,有着相同的成岩、成矿环境;江头矿区矿石中铀矿物主要为沥青铀矿,呈浸染状,并伴有少量钛铀矿、铀石等,沥青铀矿化学年龄分别为121.3±9.8Ma、98.8±8.0Ma、73.2±8.8Ma,分别代表区内3期铀成矿作用的时代,结合区内自中生代以来的6次构造伸展运动,认为区内铀成矿作用是受中-新生代盆地边缘深大断陷活动、产铀花岗岩体分布的双要素成矿动力学背景制约,青嶂山岩体应与诸广、贵东岩体具有相似的找矿前景。
中文关键词:青嶂山岩体;江头矿区  铀矿物特征  化学年龄  成矿动力背景
 
Uranium Micromineralogy and Geochronology for Jiangtou Uranium Ore Field in the Qingzhangshan Granite pluton, North Guangdong: Constraints on the Genetic Relationship with Metallogenic Dynamic Background
Author NameAffiliationE-mail
LAI Jing Research Institute No. 290,CNNC,Shaoguan,Guangdong,512026 jinglai1994@163.com 
QI Jiaming Research Institute No. 290,CNNC,Shaoguan,Guangdong,512026 jiaming_qi@126.com 
CHEN Junjun Research Institute No. 290,CNNC,Shaoguan,Guangdong,512026  
LI zhongshu Research Institute No. 290,CNNC,Shaoguan,Guangdong,512026  
CAO Haojie Research Institute No. 290,CNNC,Shaoguan,Guangdong,512026  
Abstract:Qingzhangshan (Longyuanba) pluton who is located between Zhuguang and Guidong granitc complex which are two of the most important granite-type uranium concentration areas of South China, is the weak area in the study of granite-type uranium deposits. Jiangtou uranium mining area is located in the place where is the combination of northern part of Qingzhangshan pluton and Nanxiong fault basin. So far, no reports relevant to chronology of uranium have been reported. The micromineralogical characteristics of uranium in this area have been studied by means of electron microprobe. At the same time, the U-Th-Pb chemical ages of magmatic crystalline uraninite and hydrothermal pitchblende have been calculated and the dynamic background of uranium mineralization and geological bodies of ore-forming have been discussed. Results show that: the uranium minerals in the coarse-grained porphyritic biotite granite and medium-grained porphyritic biotite granite are mainly uraninite and coffinite, some uraninite have obvious characteristics of uranium release. The chemical ages of uraninite are 246.8±8.8 Ma and 161.5±8.0 Ma,which is consistent with the range of previous zircon U-Pb ages, representing the diagenetic ages of Indosinian and Yanshanian granites respectively. It shows that before the formation of Nanxiong fault basin, Qingzhangshan pluton and Zhuguang pluton were an organic whole with the same diagenetic and metallogenic environment. The uranium minerals in ore of Jiangtou mining area are mainly pitchblende which is disseminated and accompanied by a small amount of brannerite, coffinite, etc. The chemical ages of pitchblende are 121.3±9.8Ma, 98.8±8.0Ma and 73.2±8.8Ma, representing three stages of uranium metallogenesis age in the area. Combining with the six tectonic extensional movements since Mesozoic, it had been considered that uranium mineralization in this area is controlled by the dual-factor metallogenic dynamic background of deep fault depression activity in the margin of Mesozoic-Cenozoic basins and distribution of uranium-producing granite bodies. The Qingzhangshan pluton should have similar prospecting prospects with Zhuguang and Guidong pluton.
keywords:Qingzhangshan pluton  Jiangtou mining area  Characteristics of uranium minerals  Chemical ages  Ggeodynamic background of mineralization  
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