地质论评2026，Vol.72Issue(1)：177-198,22.DOI:10.16509/j.georeview.2025.07.037
西刚果造山带东缘Inkisi组砂岩岩石学、年代学特征及地质意义
Petrographic and chronological characteristics and geological significance of Inkisi Formation sandstones from eastern margin of the west Congo Orogenic Belt
摘要
Abstract
Objectives:The West Congo Orogenic Belt is a part of Africa where the San Francisco Craton and Congo Craton converged and collided during the Pan African period.Its tectonic evolution has attracted the attention of scholars both domestically and internationally.Conducting research on the stratigraphy during this period is of great significance for exploring the tectonic evolution of the orogenic belt. Methods:This study selected the Inkisi Formation sandstone in the northwest of Angola in the foreland basin on the eastern edge of the orogenic belt as the research object,and conducted studies on chronology and petrology. Results:The minimum detrital zircon age in the Inkisi Formation sandstone is 588.0±3.0 Ma,and the discrimination diagram indicates that the sandstone was formed in a sedimentary basin under a collision background.The chemical alteration indices(CIA,CIW,PIA)of the Inkisi sandstone are 63.34～73.17,70.82～92.29,and 65.19～89.56,the Sr/Ba values ranging from 0.07 to 0.24＜0.5. Conclusions:The petrological and chronological characteristics of the Inkisi sandstone indicate that it was formed in a basin related to collision environments in the context of active continental margins,and is a product of river sedimentary environments.Its source area was warm and humid ancient climate conditions,and the source rocks underwent low to moderate weathering.It is a response to the Pan African West Congo orogeny,and also suggests that the West Congo collisional orogeny continued during the Ediacaran-Early Cambrian period.关键词
西刚果造山带/安哥拉/Inkisi组/前陆盆地/构造背景Key words
West Congo Orogenic Belt/Angola/Inkisi Formation/foreland basin/tectonic setting引用本文复制引用
张金龙,李强,张洪瑞,潘志龙,罗迪柯,邢伟伟,刘思林,于龙,贾鹏飞,杨宁..西刚果造山带东缘Inkisi组砂岩岩石学、年代学特征及地质意义[J].地质论评,2026,72(1):177-198,22.基金项目
本文为安哥拉国家地质调查计划(编号:PLANAGEO)项目的成果. This paper is supported by the Angolan National Geological Survey Program(No.PLANAGEO)Project.In addition,I sincerely thank the reviewers for their valuable revision suggestions!Thank you for the strong support from the Laboratory of Regional Geological Survey Institute of Hebei Province and the Analysis and Testing Research Center of Beijing Geological Research Institute of Nuclear Industry! （编号:PLANAGEO）
