世界核地质科学2025，Vol.42Issue(6)：1140-1161,22.DOI:10.3969/j.issn.1672-0636.2025.06.002
塔里木盆地巴什布拉克铀矿床稳定同位素特征及其地质意义
Stable isotope characteristics of Bashibulake uranium deposit in Tarim basin and its geological significance
摘要
Abstract
The Bashibulake uranium deposit is a sandstone-type uranium deposit developed under the background of oil and gas seepage.The type,source of the ore-forming fluid and mineralization mechanism are still controversial and need further investigation.This article conducted a detailed study on the H,O,C,and S stable isotope characteristics,alteration characteristics,and uranium mineralogical characteristics of the ore-bearing layer and host sandstones.The results indicated that the δDV-SMOW and δ18OV-SMOW of clay minerals range from-72 ‰ to-53.4 ‰,from 1.4 ‰ to 14.8 ‰ respectively;The δ13CV-PDB,δ18OV-PDB and δ18OV-SMOW of carbonate minerals range from-18.6 ‰ to 0.7 ‰,from-13.3 ‰ to-5.2 ‰,from 18.4 ‰ to 25.5 ‰;the whole-rock δ34SV-CDT range from-14.4 ‰ to 17.4 ‰;the ore-bearing layers mainly developed hematitization,ferritization,carbonatization,metal sulfidization,clayization and bituminization;the primary uranium minerals mainly include uraninites,pitchblendes,titanium contained uranium minerals and uranium oxide/jordisite mixture.Uranium minerals were produced in conjunction with metal sulfides and are distributed along the edges of or wrapped in bitumen.The ore-forming fluids mainly included oxygen-bearing and uranium-bearing water produced by denudation and leaching of uranium-rich plutons in South Tianshan Mountains,hot brine driven by volcanic eruption in Tuoyun basin and hydrocarbon-bearing fluids produced by Jurassic source rocks during the oil and gas filling period.The uranium mineralization process can be divided into three stages:the early phreatic oxidation mineralization stage(144～137 Ma),the middle hot brine mineralization stage(120～50 Ma)and the late oil and gas seepage mineralization stage(38 Ma to present).关键词
巴什布拉克/砂岩型铀矿/稳定同位素/成矿流体/热卤水/油气渗出Key words
Bashibulake/sandstone-type uranium deposit/stable isotope/ore-forming fluid/hot brine/oil and gas seepage分类
天文与地球科学引用本文复制引用
WANG Yuansheng,QIN Mingkuan,GUO Qiang,DING Tong,LIU Mengkui,ZHANG Hao,HUANG Shaohua..塔里木盆地巴什布拉克铀矿床稳定同位素特征及其地质意义[J].世界核地质科学,2025,42(6):1140-1161,22.基金项目
核技术研发科研项目(编号:地H2401)资助 Supported by Research and Development Projects on Nuclear Technology(No.地 H2401) （编号:地H2401）
