Paleogeolography of early Coal-Forming of late Permian in Chongqing

Abstract:

A total of two third-order sequences are subdivided in Late Permian. Sequence 1 is from the bottom of the Longtan Formation to the bottom of C₁₆ coal in Longtan Formation,representing a transgressive to regressive cycle,and the Sequence 2 is from the bottom of C₁₆ coal in Longtan formation to the top of the Changxing Formation. From Maokou formation to the first flooding surface (the bottom of the C₂₅) is the low systems tract in sequence 1(the earlier stage of coal accumulation). The palaeogeographic map has been reconstructed based on the contour maps of a variety of palaeogeographic parameters including total thickness of strata,thickness of sandstone,thickness of mudstone,and sandstone-mudstone ratio. The paleogeographic units include lowlandhighland eluvial plain and bay-lagoon-tidal. The transgression comes from south and the sediment provenances are mainly from the Kangdian old land in the west.

• Periodical: Advanced Materials Research (Volumes 734-737)
• Pages: 235-240
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.734-737.235
• Online since: August 2013
• Authors: Cai Xia Gao, Long Yi Shao, Cai Hong Gao, Chang Lin Li
• Keywords: Chongqing, Late Permian, Paleogeolography, Sequence Stratigraphy

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