高校地质学报2025，Vol.31Issue(3)：324-334,11.DOI:10.16108/j.issn1006-7493.2024035
柴达木盆地大红沟剖面新生代沉积物粒度特征及其沉积相意义
Grain-size Characteristics and the Implications for Sedimentary Facies of the Cenozoic Sediments in the Dahonggou Section of the Qaidam Basin
摘要
Abstract
The Qaidam Basin is the largest basin on the northeastern Tibetan Plateau,where the Cenozoic sediments attain thicknesses up to over 10 km.These sediments record the growth process of the plateau and the paleoclimatic changes,and thus attract wide attention.Previous studies focused on describing these strata and qualitatively determining their sedimentary facies,with few quantitative studies.In this study,to quantitatively determine the sedimentary facies,grain-size analysis has been conducted on typical sandstone samples from the Cenozoic Xiaganchaigou to Shizigou formations in the Dahonggou section of the Qaidam Basin.Various methods,such as Sahu discriminant,grain size frequency distribution,end-member component analysis,and cumulative frequency distribution,have been employed to reveal the transport medium,transport mode,and sedimentary environment of the Cenozoic sediments in this section.The results show that the sediments of the Xiaganchaigou to Shangyoushashan formations were deposited mainly in an off-shore,shallow lake setting,with the hydrodynamic conditions successively weakening from the Xiaganchaigou,Shangyoushashan,Shangganchaigou,to Xiayoushashan formations.In these formations,the transported sediments include the suspended lake background component,the suspended turbidity current component,the jumping fine sand component,and rolling coarse sand component,with the last three coming from subaqueous distributary channels.In contrast,the sediments of the Shizigou Formation were mainly deposited in an on-shore,fluvial setting,containing transported sediments of suspended river background,and alluvial suspended turbidity current,jumping fine sand and rolling coarse sand components.These results provide quantitative constraints for determining the sedimentary facies of the Cenozoic sediments of the Dahonggou section of the Qaidam Basin.In a broader perspective,this study provides an analytical procedure for quantitatively determining the sedimentary facies using the grain-size results.关键词
柴达木盆地/新生代沉积物/粒度分析/沉积特征Key words
Qaidam Basin/Cenozoic sediments/grain-size analysis/sedimentary facies分类
海洋学引用本文复制引用
潘邵敏,安凯旋,胡逸豪,张文静,林秀斌..柴达木盆地大红沟剖面新生代沉积物粒度特征及其沉积相意义[J].高校地质学报,2025,31(3):324-334,11.基金项目
国家自然科学基金企业创新发展联合基金集成项目(U22B6002) （U22B6002）
面上项目(42372245)联合资助 （42372245）
