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现代地质 ›› 2025, Vol. 39 ›› Issue (03): 825-838.DOI: 10.19657/j.geoscience.1000-8527.2025.024

• 能源地质与工程 • 上一篇    下一篇

豫西何家寨组沉积地球化学特征及古环境意义

王欣(), 郑德顺*(), 孙风波, 徐博洋, 李倩倩, 李婷, 石泽远   

  1. 河南理工大学资源环境学院,河南 焦作 454003
  • 出版日期:2025-06-10 发布日期:2025-07-03
  • 通信作者: *郑德顺,男,教授,博士生导师,1977年出生,主要从事沉积地质学方面的教学和研究工作。Email:zhengdeshun@126.com
  • 作者简介:王 欣,女,硕士研究生,2000年出生,主要从事沉积盆地分析研究工作。Email:wx7695@126.com
  • 基金资助:
    国家自然科学基金项目(42172131)

Sedimentary-geochemical Characteristics and Paleoenvironmental Significance of the Hejiazhai Formation in Western Henan

WANG Xin(), ZHENG Deshun*(), SUN Fengbo, XU Boyang, LI Qianqian, LI Ting, SHI Zeyuan   

  1. School of Resources and Environment, Henan Polytechnic University, Henan, Jiaozuo 454003
  • Published:2025-06-10 Online:2025-07-03

摘要:

新元古界碎屑与碳酸盐混合沉积岩保存的古海洋环境及古沉积环境信息能够响应新元古代氧化事件。本文以豫西何家寨组为研究对象,通过沉积岩石学、地球化学等研究方法,探讨了何家寨组沉积特征及沉积环境,恢复了古海洋条件,以期为华北南缘新元古代古环境研究提供依据。研究表明:何家寨组由泥质灰岩、灰岩和含石英碎屑灰岩等组成,可见叠层石及臼齿构造,为海相碳酸盐岩潮坪沉积。V/Cr、Ni/Co、Sr/Ba指示何家寨组古水深、古海洋氧化还原状态之间具良好相关性,经历了三次水体加深后变浅、古海洋氧含量减少后增加的旋回。通过与同期地层古环境对比,新元古代早期板块周缘海洋环境呈现氧化状态。对何家寨组沉积环境分析可为该地区沉积环境划分和古地理条件恢复提供帮助,为新元古代氧化事件提供证据支撑。

关键词: 新元古代, 何家寨组, 混积岩, 叠层石, 豫西地区

Abstract:

The paleo-marine environment and paleo-sedimentary environment information preserved by the Neoproterozoic 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 environment, to reconstruct the pale-oceanic conditions and finally to provide some basis for the paleoenvironmental reconstruction of the Neoproterozoic southern margin of the North China Craton. The Hejiazhai Formation is composed of marlstone, limestone and quartz-bearing clastic limestone, and some molar-tooth structures and stromatolites 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 paleoenvironment 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 analyze 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.Keywords: Neoproterozoic; Hejiazhai Formation; diamictite; stromatolite; Western Henan

Key words: Neoproterozoic, Hejiazhai Formation, diamictite, stromatolite, Western Henan

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