Abstract
The sedimentary facies and sedimentology of the Carboniferous–Permian strata in the Bohai Bay area are used to develop a coal-forming paleogeography during the late Carboniferous, and early and middle Permian periods. During the Carboniferous–Permian period, the Bohai Bay area was located in the southeast margin of the large North China Basin. The sedimentary characteristics, coal-forming processes and evolution of the sediment fill are similar to those of the North China Basin but have their own unique characteristics of deposition and coal formation. This paper summarises the paleogeographic characteristics and changes in sea–land distribution, provenance and climate from the late Carboniferous to the middle Permian. Sea-level changes are considered to control the filling of the basin, the development and distribution of peat bogs, and the characteristics of coal formation. Late in the evolution of the epicontinental basin, following the end of the transgressive systems tract, the sea-level in the study area slowly declined and gradually withdrew from North China. At this time, the study area was primarily dominated by the development of shallow-water delta sedimentary systems, representing the most stable period for coal formation.
Published Version
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