华北地质2025，Vol.48Issue(4)：63-73,11.DOI:10.19948/j.12-1471/P.2025.04.06
柴达木盆地西部七个泉地区新近系狮子沟组沉积环境分析
Depositional environment analysis of Neogene Shizigou Formation in Qigequan area,west Qaidam Basin
摘要
Abstract
[Objective]The sedimentary environment of ore-bearing layer is crucial to the formation of sandstone-type uranium deposits.The paleoclimate,palesalinity and paleo-redox conditions of the formation of Shizigou Formation are discussed,and the constraints on uranium mineralization are discussed from the aspects of salinity,humidity and REDOX conditions during the sedimentary period.[Methods]Based on the geochemical analysis of 12 sandstone samples of Shizigou Formation in Qiquan area of western Qaidam,the sedimentary environment of Shizigou Formation is studied by using the geochemical indexes sensitive to the sedimentary environment.[Results]The results show that the Sr/Cu value range is mainly from 6.80 to 65.08(in average of 18.71),K2O/Al2O3 value range is from 0.16 to 0.21,Sr/Ba value range is mainly from 0.31 to 0.93(in average of 0.56),U/Th value range is from 0.22 to 0.31,V/(V+Ni)value range is from 0.71 to 0.76,V/Cr value range is from 1.23 to 1.43,Ni/Co value range is from 1.51 to 2.67,Fe2+/Fe3+value range is mainly from 0.21 to 0.89(in average of 0.50),Cu/Zn value range is from 0.30 to 0.47,and δCe value range is from 0.84 to 0.97.[Conclusions]The geochemical data shows that the Shizigou Formation in the Qigequan area was formed in an oxygen-rich terrestrial freshwater lake environment and a cold,arid climate.关键词
柴达木盆地/新近系/砂岩型铀矿/狮子沟组/沉积环境Key words
Qaidam Basin/Neogene/sandstone-type uranium/Shizigou Formation/depositional environment分类
天文与地球科学引用本文复制引用
雷涛,奥琮,王铎,滕雪明,杨梅,杨君..柴达木盆地西部七个泉地区新近系狮子沟组沉积环境分析[J].华北地质,2025,48(4):63-73,11.基金项目
青海省油田科技项目"柴达木盆地大规模砂岩型铀超常富集机理研究(研2020-勘探-技术-15)" （研2020-勘探-技术-15）
国家重点研发计划项目"北方盆地大规模铀成矿动力学过程、成矿规律与成矿预测(2023YFC2906704)" Supported by Qinghai oilfield science and technology project(RCH2020-EXP-TECH-15) （2023YFC2906704）
National Key Research and Development Program(2022YFE0119900) （2022YFE0119900）
