Introducing Devsagar Sandstone Member: A revised stratigraphy of the Mesoproterozoic Chattisgarh basin, Central India

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Journal of Earth System Science Pub Date : 2024-06-18 DOI:10.1007/s12040-024-02325-z
Sayani Khan, Sarbani Patranabis-Deb, Amlan Banerjee
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Abstract

Chandarpur–Raipur sequence in Chattisgarh basin is represented as siliciclastic-dominated Chandarpur Group and carbonate-dominated Raipur Group. Here, we introduce ‘Devsagar Sandstone Member’, the only sandstone-dominated member in the carbonate-dominated Charmuria Formation of Raipur Group, that marks a period of rapid siliciclastic deposition identifying a phase of forced regression between two carbonate platforms of Charmuria–Chandi formations, thereby indicating a drastic change in palaeogeography of Raipur Group. In addition, this study revised the litho-stratigraphy of Mesoproterozoic Chattisgarh basin to clarify the confusion raised due to the existence of different stratigraphy in different basinal parts and different nomenclature for the same lithologic units. Detailed geological mapping with facies analysis in the eastern part of the basin manifests the entire basin-fill succession as part of the Chattisgarh basin itself, rather than sub-dividing some parts as Baradwar sub-basin and Singhora proto-basin. Singhora Group deposited in Singhora proto-basin has already been presented as equivalent of Chandarpur Group. Here we propose, Bamandihi–Saradih–Raigarh formations of Raipur Group in Baradwar sub-basin, as lateral equivalent of Gunderdehi–Chandi–Tarenga formations of Raipur Group and Sarnadih–Nandeli formations of Kharsiya Group in Chattisgarh basin. Inferred depositional environment and tectonic setting of Chattisgarh basin support the lithostratigraphic revision, which will help in basin analysis as well as intrabasinal–interbasinal correlation in regional and global contexts.

Research highlights

  • Devsagar Sandstone Member introduced as the only sandstone-dominated member in carbonate-dominated Charmuria Formation of Raipur Group.

  • Devsagar Sandstone Member represents a tidal shelf in between two carbonate ramp platforms (Charmuria and Chandi), marking a period of rapid siliciclastic deposition and the only phase of forced regression in overall sea-level rising scenario of the carbonate-dominated Raipur Group.

  • Stratigraphy of Chattisgarh basin revised. The entire Chattisgarh succession is represented as deposits of Chattisgarh basin only, without further subdivision into sub-basin and/or proto-basin, thus resolving the stratigraphic and basinal correlation problem.

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介绍 Devsagar 砂岩成员:印度中部中新生代恰蒂斯加尔盆地地层学修订版
摘要 恰蒂斯加尔邦盆地的昌达普尔-赖普尔层序包括以硅质岩为主的昌达普尔组和以碳酸盐岩为主的赖普尔组。在此,我们介绍了 "德夫萨加尔砂岩组",它是赖普尔组以碳酸盐岩为主的查穆里亚地层中唯一以砂岩为主的组份,标志着硅质岩快速沉积的时期,确定了查穆里亚-昌迪地层两个碳酸盐岩平台之间的强迫回归阶段,从而表明赖普尔组的古地理发生了急剧变化。此外,该研究还对中新生代恰蒂斯加尔盆地的岩相地层学进行了修订,以澄清因不同盆地部分存在不同地层以及相同岩性单元存在不同命名方法而造成的混淆。在盆地东部进行的详细地质测绘和岩相分析显示,整个盆地充填演替都是恰蒂斯加尔盆地本身的一部分,而不是将某些部分细分为巴拉德瓦尔亚盆地和辛霍拉原盆地。沉积于 Singhora 原盆地的 Singhora 组已被认为相当于 Chandarpur 组。在此,我们建议将巴拉德瓦次盆地中赖普尔组的 Bamandihi-Saradih-Raigarh 地层与恰蒂斯加尔邦盆地中赖普尔组的 Gunderdehi-Chandi-Tarenga 地层和卡西亚组的 Sarnadih-Nandeli 地层进行横向对比。推断出的恰蒂斯加尔邦盆地沉积环境和构造环境支持岩石地层学的修订,这将有助于盆地分析以及区域和全球范围内的盆地内-盆地间相关性研究重点德夫萨加尔砂岩组是莱普尔组以碳酸盐为主的查穆里亚地层中唯一以砂岩为主的岩组。Devsagar 砂岩组代表了两个碳酸盐岩斜坡平台(Charmuria 和 Chandi)之间的潮汐大陆架,标志着硅质沉积的快速时期,也是以碳酸盐岩为主的赖普尔组整体海平面上升过程中唯一的被迫回归阶段。整个恰蒂斯加尔演替仅代表恰蒂斯加尔盆地的沉积,而没有进一步细分为亚盆地和/或原盆地,从而解决了地层和盆地相关性问题。
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来源期刊
Journal of Earth System Science
Journal of Earth System Science Earth and Planetary Sciences-General Earth and Planetary Sciences
CiteScore
3.20
自引率
5.30%
发文量
226
期刊介绍: The Journal of Earth System Science, an International Journal, was earlier a part of the Proceedings of the Indian Academy of Sciences – Section A begun in 1934, and later split in 1978 into theme journals. This journal was published as Proceedings – Earth and Planetary Sciences since 1978, and in 2005 was renamed ‘Journal of Earth System Science’. The journal is highly inter-disciplinary and publishes scholarly research – new data, ideas, and conceptual advances – in Earth System Science. The focus is on the evolution of the Earth as a system: manuscripts describing changes of anthropogenic origin in a limited region are not considered unless they go beyond describing the changes to include an analysis of earth-system processes. The journal''s scope includes the solid earth (geosphere), the atmosphere, the hydrosphere (including cryosphere), and the biosphere; it also addresses related aspects of planetary and space sciences. Contributions pertaining to the Indian sub- continent and the surrounding Indian-Ocean region are particularly welcome. Given that a large number of manuscripts report either observations or model results for a limited domain, manuscripts intended for publication in JESS are expected to fulfill at least one of the following three criteria. The data should be of relevance and should be of statistically significant size and from a region from where such data are sparse. If the data are from a well-sampled region, the data size should be considerable and advance our knowledge of the region. A model study is carried out to explain observations reported either in the same manuscript or in the literature. The analysis, whether of data or with models, is novel and the inferences advance the current knowledge.
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