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首页> 外文期刊>Neues Jahrbuch fur Geologie und Palaontologie. Abhandlungen >Paleoenvironment and sequence stratigraphy of the Albian Kharita Formation, North Western Desert, Egypt: Insights from palynological and palynofacies analyses
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Paleoenvironment and sequence stratigraphy of the Albian Kharita Formation, North Western Desert, Egypt: Insights from palynological and palynofacies analyses

机译：古老天沟和序列地层的埃及北西部沙漠，埃及北西部地区：来自Palynological和Palynofacies的见解分析

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The current study addresses the palynological and palynofacies analyses for the upper part of the Kharita Formation in the Abu Gharadig Basin that is one of the most petroliferous basins throughout the north Western Desert. The studied succession is represented by twenty-eight samples selected from BED2-3 well, where a moderately diverse assemblage of spores, pollen grains and dinoflagellate cysts (dinocysts) is recorded. Around 15 dinocysts species, 14 species of pteridophytic spores, and 13 species of pollen grains are defined. An Interval palynozone is reconstructed based on the first downhole occurrence of Cretacaeiporites densimurus, which infers an age not younger than late Albian and reinforced by other marker sporomorphs taxa that includes Afropollis jardinus, Elatersporites klaszii, Elaterocolpites castelainii, Trilobosporites laevigatus, and Crybelosporites pannuceus. Palynofacies analysis led to define two palynofacies assemblages, whereby the first assemblage is characterized by slightly higher phytoclast content than the AOM with a relative abundance of opaque wood particles along with moderate to high sphaeromorphs pollen grains and dinocysts compared to moderate pteridophyte spores and freshwater algae, revealing deposition in high energetic shallow marine environment. The second palynofacies assemblage is dominated by moderate contents of AOM and phytoclasts with an overwhelming abundance of spores and moderate pollen grains compared to very low dinocysts. This palynofacies assemblage indicates deposition in a fluvio-deltaic to marginal shallow marine environment. Additionally, stratigraphic vertical composition of palynofacies and palynomorphs led to divide the upper part of the Kharita Formation into two complete 3rd order transgressive-regressive sequences and incomplete one.
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