世界核地质科学2025，Vol.42Issue(6)：1123-1139,17.DOI:10.3969/j.issn.1672-0636.2025.06.001
准噶尔盆地北部黄花沟地区下白垩统吐谷鲁a～b亚群粒度特征及其对沉积环境的指示
Grain size characteristics of sandstones in the Lower Cretaceous Tugulu subgroups a～b and its indication to sedimentary environment of Huanghuagou area in northern Junggar basin
摘要
Abstract
Lower Cretaceous Tugulu group in the Huanghuagou area of the northern Junggar basin is a set of clastic rock deposits of'gray and coarse in the lower and fine in the upper'.Tugulu subgroups a～b is the main target layer for sandstone-type uranium prospecting in this area.This paper systematically analyzed and summarized the sandstone lithology characteristics,sedimentary structure with probability accumulation curve,Sahu discriminant,grain size parameter scatter diagram and C-M diagram,the main three recongnitions are:1)The rock types of the Tugulu subgroups a～b of the Lower Cretaceous in the Huanghuagou area are mainly feldspathic lithic sandstone,feldspathic sandstone,and a small amount of lithic feldspathic sandstone.The well developed rocks is of good the physical properties,and high reduction capacity.Which represents a suite of primary gray coarse clastic deposits,with favorable space for sandstone-type uranium mineralization.2)The sandstone grain size of Tugulu subgroups a～b is mainly concentrated in the range of fine sand and medium sand with medium to poor in sorting.Asymmetric bimodal grain size frequency distribution curve of positive skewness wide and slow cumulative curve,indicating the sediments may be multi-source coarse clastic fluvial facies deposits formed by unstable high water energy conditions under different nutrient forces.3)The grain size probability accumulation curves of Tugulu subgroups a～b mainly develop two types of curves:'three-stage'and'two-stage',which represent a sedimentary environment of the river channel formed by the traction flow with strong hydrodynamic force in Tugulu subgroup a and the sedimentary characteristics of the delta plain branch channel in Tugulu subgroup b.The C-M diagram develops PQ section,QR section and parallel section with C=M baseline,which is dominated by progressive suspension and has typical traction flow sedimentalogy characteristics,reflecting the characteristics of multi-source braided river control deposition in Huanghuagou area.关键词
粒度特征/水动力条件/下白垩统吐谷鲁a～b亚群/黄花沟Key words
grain size characteristics/hydrodynamic condition/the Lower Cretaceous Tugulu subgroups a～b/Huanghuagou area分类
天文与地球科学引用本文复制引用
JI Huali,HE Zhongbo,ZHONG Jun,CHEN Hong,ZHOU Hongwei,ZHU Bin,GUO Zixin..准噶尔盆地北部黄花沟地区下白垩统吐谷鲁a～b亚群粒度特征及其对沉积环境的指示[J].世界核地质科学,2025,42(6):1123-1139,17.基金项目
铀资源探采与核遥感全国重点实验室基金项目(编号:地ZJ2404)、新疆自治区重大科技专项(编号:2024A03003-2)和中核集团青年英才"菁英"项目(编号:QNYC2021-1)联合资助 Supported jointly by Nuclear Technology R&D Program(No.ZJ2404),the Major Science and Technology Project of Xinjiang Autonomous Region(No.2024A03003-2)and the CNNC Youth Talent'Eilit'Program(No.QNYC2021-1). （编号:地ZJ2404）
