University of Khartoum

Palynostratigraphy of Early Cretaceous Sediments of NW Muglad Basin Central SW Sudan

Palynostratigraphy of Early Cretaceous Sediments of NW Muglad Basin Central SW Sudan

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Title: Palynostratigraphy of Early Cretaceous Sediments of NW Muglad Basin Central SW Sudan
Author: Omer Babiker Abd, El Rahim
Abstract: This biostratigrphic study of continental sediments in SW Sudan, Interior Rift Basins is based on spores and pollen grains. NW Muglad Basin is part of SW Sudanese Interior Rift Basins, which contains huge amount continental sediments deposited in fluvio-lacustrine environments. Borehole data obtained from Doleib-l and Abu Gabra-l, were selected for the present, study. The prepared samples yielded a diverse spore/pollen assemblages, about, seventy five (75) palynomorphs species were recognized which belong to different types of plant groups such as pteridophyte, gymnosperm. some early angiosperm and alga.• The studied palynofloral associations from the Abu Gabra Formation (Neocomian-Aptian) of the two boreholcs are somewhat similar with small variations. From a total of seventy five (75) species presented on a range-chart, seventeen (17) species were described as being (Neocomian-Barremian); the most significant of these are: Classopollis torosus, Celyphus rallus, Auritulinasporites sp., Aequitriradites spinulosus, Exesipollenites tumulus, Deltoidospora 'psilotomata Concavissimisporites punctatus, Callialasporiles lurbatus. Ca!lia!asporites dampieri, Exesipollenites sp. sensu TERVISON 1973 (=Dyad). Klukisporites cf variegatus. The above assemblage contains also species from (Aptian-Albian) such as: Gnetaceaepollenites vancampoae, Cicatricosisporites orbiculatus. /Afropolli jardinus, Equisetosporites jansonii, Gnetac eaepollenites oreadis. (jneta( aepollenites boltenhaggnii. These Aptian/Albian species were possihly brought about through down-hole contamination. Comparison with relevant palynomorph assemblages in Libya, Egypt. Sudan, as well as from West Africa and South America was made to verify age assignment. The studied palynomorphs assemblage from the Abu Gabra of Doleib-l borehole shows high amount of Classopollis torosus and brackish water algal spore Celyphus rallus. While the studied assemblage from the same formation of Abu Gabra-l borehole produced numerous species Cicatricosisporites sp
URI: http://khartoumspace.uofk.edu/handle/123456789/14002
Date: 2015-06-22


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