陕、豫、鄂交界一带南华系—寒武系的划分及沉积环境分析
The Study of Nanhua-Cambrian Systems and Their Sedimentary Environment Analysis in the Boundary Areas of Shaanxi, Henan and Hubei Provinces
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摘要: 在系统考察陕、豫、鄂地区和湖北三峡剖面以后，在前人研究的基础上，对原测制的南华系—寒武系主要剖面进行了重新划分对比，提出了本区应存在南华系莲沱组，寒武系被划分的上寒武统应恢复原来的组名，不用石瓮子组代表上寒武统蜈蚣丫组和下奥陶统水田河组较为合适。因柞水地区的石瓮子组是指碳硅质板岩之上不含生物化石的镁质碳酸岩。据所采集的生物化石、遗迹化石，寒武系可以清楚的被划分为下、中、上统（含芙蓉统），并对各统之间的岩相古地理特征进行了系统地描述，为区域地层划分、省内外地层对比提供了重要的依据。Abstract: According to the systematic investigation of the cross-sections in the boundary areas of Shaanxi, Henan and Hubei provinces, a new division of Nanhua-Cambrian is made on the previously measured sections in the area. It is suggested that the Liantuo formation of Nanhua era should exist in the district. The upper Cambrian should be restored as a formation name, and Shiwenzi formation should no longer represent both Wugongya formation in upper Cambrian and Shuihetian formation in lower Ordovician, due to the fact that the Shiwengzi formation in Zhashui area is merely magnesian carbonate deposits without fossils, located above the carbonaceous and silicious slate. According to the collected fossils and relics, the Cambrian can be clearly divided into lower, middle and upper (including Furongian) parts. The lithofacies palaeogeography features of each formation are systematically described, and provide significant foundation for regional strata division and provincial comparison.
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Key words:
- Shaanxi /
- Henan and Hubei Provinces /
- Liantuo Formation /
- Cambrian
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