现代地质2025，Vol.39Issue(3)：825-838,14.DOI:10.19657/j.geoscience.1000-8527.2025.024
豫西何家寨组沉积地球化学特征及古环境意义
Sedimentary-geochemical Characteristics and Paleoenvironmental Significance of the Hejiazhai Formation in Western Henan
摘要
Abstract
The paleo-marine environment and paleo-sedimentary environment information preserved by the Neo-proterozoic clastic and carbonate mixed sedimentary rocks can respond to the Neoproterozoic oxidation events.In this paper,via a combination of sedimentological and geochemical methods,the Hejiazhai Formation in western Henan Province was taken as a case study to discuss the sedimentary characteristics and its depositional environ-ment,to reconstruct the pale-oceanic conditions and finally to provide some basis for the paleoenvironmental re-construction of the Neoproterozoic southern margin of the North China Craton.The Hejiazhai Formation is com-posed of marlstone,limestone and quartz-bearing clastic limestone,and some molar-tooth structures and stroma-tolites can be seen,which are the characteristics of marine carbonate tidal flat deposits.The ratios of V/Cr、Ni/Co and Sr/Ba indicate that there is a good correlation between the paleo-water depth and the redox condition of the paleo-ocean in the Hejiazhai Formation.It has experienced three cycles of water deepening and shallowing,and the oxygen content of the paleo-ocean decreases and then increases.By comparing with the paleoenviron-ment of the strata in the same period,the marine environment around the early Neoproterozoic plate has shown an oxidation state.We can use the conclusion of sedimentary environment analysis of Hejiazhai Formation to an-alyze the sedimentary environment and paleogeographic conditions of carbonate rocks in the southern margin of North China.The results of the analysis can provide evidence support for the Neoproterozoic oxidation events.关键词
新元古代/何家寨组/混积岩/叠层石/豫西地区Key words
Neoproterozoic/Hejiazhai Formation/diamictite/stromatolite/Western Henan分类
地质学引用本文复制引用
王欣,郑德顺,孙风波,徐博洋,李倩倩,李婷,石泽远..豫西何家寨组沉积地球化学特征及古环境意义[J].现代地质,2025,39(3):825-838,14.基金项目
国家自然科学基金项目(42172131). （42172131）
