地质科学2026，Vol.61Issue(2)：415-439,25.DOI:10.12017/dzkx.2026.029
走廊过渡带景泰地区三叠系南营儿群物源示踪及其地质意义
Provenance analysis of Nanying'er Group in the eastern Hexi corridor belt and its geological significance
摘要
Abstract
The study of the Late Triassic provenance system and basin features in the eastern transitional zone of the corridor has been relatively weak and poorly understood.This study conducted a systematic source analysis of the Upper Triassic Nanying'er Group in the Jingtai area of the eastern transition zone of the corridor using methods such as detrital zircon geochronology and geochemistry.Based on this,detrital zircon geochronology data from neighboring contemporaneous strata were collected for regional comparison,providing a reliable basis for a comprehensive understanding of the original basin features of the corridor transition zone of Ordos Basin.The whole rock geochemical results obtained in this study indicate that its main source is the felsic source area.The results of detrital zircon geochronology indicate that the detrital zircons of the Upper Triassic Nanying'er Group in the Jingtai area of the corridor transition zone mainly exhibit two main age distribution ranges:Late Paleozoic(peak age of 270.1 Ma)and Early Paleoproterozoic(peak age of 1 832 Ma),as well as a small amount of Neoproterozoic and Late Paleoproterozoic-Early Neoproterozoic ages.Based on a comprehensive comparison of the potential provenance areas in the surrounding areas,it is believed that the provenance in the Jingtai area of the corridor transition zone mainly comes from the Alxa block in the north,and a small amount of provenance may also be provided by the northern edge of the North China Plate in the northeast.The regional comparison results indicate that the corridor transition zone of Ordos Basin mainly received material sources from the Alxa block,the northern edge of the North China Plate,the North Qilian Orogenic Belt,and the Qinling Orogenic Belt in the Late Triassic.However,the material source systems in different regions have significant differences.The material sources in the corridor transition zone are mainly from the Alxa block and the North Qilian Orogenic Belt,while the internal material sources in the Ordos Basin are mainly from the northern edge of the North China Plate and the Qinling Orogenic Belt.关键词
走廊过渡带东部/鄂尔多斯盆地/南营儿群/碎屑锆石/物源分析Key words
Eastern Hexi corridor belt/Ordos Basin/Nanying'er Group/Detrital zircon/Provenance analysis分类
天文与地球科学引用本文复制引用
骆得福,陈应涛,赵晓辰,李玉畅,刘一鸣,李得路,蒋一榕,王梓赫..走廊过渡带景泰地区三叠系南营儿群物源示踪及其地质意义[J].地质科学,2026,61(2):415-439,25.基金项目
国家自然科学基金项目(编号:41802119)、甘肃省科技计划联合科研基金项目(编号:25JRRD003)和甘肃煤田地质局科研项目"甘肃省景泰县一条山——靖远县北滩一带找煤方向研究"(编号:2022-01)资助 （编号:41802119）
