右江盆地大际山U-(Mo)矿床围岩蚀变特征及微量元素迁移规律——对区域内U、Au成生关系的指示
The characteristics of wall-rock alteration and the trace element migration in Dajishan U-(Mo)deposit,Youjiang basin:Implications for genetic relationship between the uranium and gold mineralization
摘要
Abstract
Located in the southwest margin of the Yangtze Block,Youjiang basin is the second largest cluster area of Carlin-type gold deposits(associated with Sb,Hg,Tl anomaly and mineralization)in the world,is also known as"Golden Triangle"of Dian-Qian-Gui.Beside the gold deposit,a large number of U deposits(occurrences)with similar ore-hosting lithology and ore-controlling structure are also developed in this area.However,previous research were mostly focused on the gold,a few was on uranium.The genetic relationship between U and Au is still unclear.In this paper,Dajishan U-(Mo)deposit in the Youjiang basin was studied as a case of a large number of U and Au deposits(or ore occurrences)discovered in the region.In space,uranium and gold mineralization are closely related which provided an ideal research object for understanding the regional mineralization process and the relationship between Au and U mineralization.In this paper,petrography,mineragraphy and geochemistry was used to study the alteration mineral in the Dajishan U-(Mo)deposit,sulfides,bitumen,goyazite,quartz and illite were examined,and the relative enrichment of Re,Tl,Mo,U,Cd,Ni,Co,As,Sb and MREE was discovered during the mineralization process.The alterated mineral assemblage and trace element migration constrain that the ore-forming materials of Dajishan U-(Mo)deposit probably came from Niutitang Formation,and the ore-forming fluid should be a mixture of reductive organic fluid and surface to near surface acidic and oxydic fluid,and the mineralization occurred in low temperature,acidic and reductive environment.Comprehensive analysis suggests that there is significant differences in the distribution characteristic and genesis of U and Au deposits in the Youjiang basin,and U and Au deposits should be products of different mineralization events.关键词
围岩蚀变特征/元素迁移规律/大际山U-(Mo)矿床/U、Au成生关系/右江盆地Key words
wall-rock alteration/trace element migration/Dajishan U-(Mo)deposit/genetic relationship between the uranium and gold mineralization/Youjiang basin分类
天文与地球科学引用本文复制引用
田建吉,刘畅,吴玉,李秋实..右江盆地大际山U-(Mo)矿床围岩蚀变特征及微量元素迁移规律——对区域内U、Au成生关系的指示[J].世界核地质科学,2024,41(3):434-449,16.基金项目
中国核工业地质局地勘费项目"川藏地区雅安-林芝段铀多金属资源评价研究"(编号:地GT2201) （编号:地GT2201）
"全国共伴生铀资源远景评价"(编号:地D2003) （编号:地D2003）
"幕阜山地区花岗-伟晶岩型铀多金属成矿作用与远景评价"(编号:22045408) （编号:22045408）
核工业北京地质研究院院长青年科技创新基金项目"白杨河矿床中铍、铀成因关系研究:来自流体包裹体及H-O-Sr-Nd同位素的约束"(编号:地QJ2103)联合资助 Supported by the project Evaluation of uranium polymetallic resources in the Ya'an Linzhi section of the Sichuan Tibet region(No.地GT2201),Prospective evaluation of national co associated uranium resources(No.地D2003),Prospective evaluation of national co associated uranium resources(No.地D2003),and Prospective evaluation and mineralization of granite type uranium deposit and pegmatite type rare metal deposits in the Mufu Mountain area(No.22045408),China Nuclear Geology （编号:地QJ2103）
Relationship between the beryllium and uranium mineralization in Baiyanghe deposit:Constrain from the fluid inclusions and H-O-Sr-Nd isotopes(No.地QJ2103),Beijing Research Institute of Uranium Geology （No.地QJ2103）
