西安科技大学学报2026，Vol.46Issue(2)：431-443,13.DOI:10.13800/j.cnki.xakjdxxb.2026.0218
准噶尔盆地吉木萨尔凹陷东部芦草沟组古环境分析
Paleoenvironmental analysis of Lucaogou Formation in eastern Jimusar Sag,Junggar Basin
摘要
Abstract
To reconstruct paleoenvironment of the Luchaogou Formation in the eastern Jimsar Sag of the Junggar Basin,such as the paleoclimate,paleosalinity and paleo-redox conditions and so on,20 samples from Luchaogou Formation were selected for petrographic analysis and elemental geochemical testing.Multiple discrimination criterias were used-such as Sr/Cu,Rb/Sr,CaO/(MgO·Al2O3),Sr content,Sr/Ba,Mg/Ca,V/(V+Ni),V/Cr,Cu/Zn,Fe/Mn,Rb/K,P/Ti,and P/Al ratios-along with total or-ganic carbon content,to reconstruct the paleoenvironment.The results show that the Luchaogou Forma-tion mainly consists of fine-grained sedimentary rocks,dominated by siltstone and mudstone.These are thick,gray-colored strata primarily composed of mudstone and carbonaceous mudstone,with interbeds of tuffaceous sandstone,argillaceous dolomite,and siltstone containing dolomitic components.During the deposition of the Luchaogou Formation,the paleoclimate tend to be hot and arid.Member Ⅰ was characterized by more intense aridity and heat,there was a gradual transition toward relatively more hu-mid conditions from Member Ⅰ to Member Ⅱ.The depositional environment was saline,with Member Ⅱ showing lower salinity than Member Ⅰ,and Member Ⅰ even exhibiting hypersaline conditions at times.Overall,the redox conditions indicate a dysoxic-anoxic environment.The formation was deposited in a deep-lake setting,with Member Ⅱ representing deeper water than Member Ⅰ.Both members ex-hibit high paleo-productivity,though Member Ⅱ has relatively higher P/Ti values,indicating higher pro-ductivity compared with Member Ⅰ.The study concludes that paleoclimate conditions and paleo-pro-ductivity were the primary controls on organic matter enrichment in Luchaogou Formation,while redox state,salinity,and water depth were secondary factors with relatively limited influence.These findings can provide theoretical guidance for understanding the paleoenvironmental evolution and hydrocarbon generation of the Luchaogou Formation in the eastern Jimsar Sag,Junggar Basin.关键词
岩石学特征/地球化学特征/古环境/有机质富集/芦草沟组/吉木萨尔凹陷/准噶尔盆地Key words
petrological characteristics/geochemical characteristics/paleoenvironment/organic matter enrichment/Lucaogou Formation/Jimusar Sag/Junggar Basin分类
能源科技引用本文复制引用
刘见通,唐建云,韦堂静,苏玉新..准噶尔盆地吉木萨尔凹陷东部芦草沟组古环境分析[J].西安科技大学学报,2026,46(2):431-443,13.基金项目
国家自然科学基金项目(52564001) （52564001）
新疆维吾尔自自治区科技厅-重点研发项目(2024B01013-1) （2024B01013-1）
国家科技重大专项项目(2025ZD1408400) （2025ZD1408400）
克拉玛依市人才选拔培养计划项目(2023rcxbjh) （2023rcxbjh）
