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001-es BibID:	BIBFORM125955
Első szerző:	Daoud Abazar Mohamed Ahmed (földtudományi kutató, geológus, geográfus)
Cím:	Diagenetic Evolution of the Wadi Halfa Oolitic Ironstone Formation (Formerly Nubian Sandstone), Northern Sudan / Abazar Daoud, Péter Rózsa
Dátum:	2024
Megjegyzések:	Clastic sediments of varying ages, types, and depositional environments, generally known as the ♭Nubian Sandstone Formation', overlay the Precam-brian basement complex rocks in Sudan, Libya, and Egypt. The Wadi Halfa Oolitic Ironstone Formation, part of this formation, spans over 500 km? near Nubian Lake in northern Sudan, bordering southern Egypt. This formation features alternating beds of shale, siltstone, and sandstone, marked by layer of oolitic ironstone and barite concretions, intercalated with ichnofossils and plant fossils spanning the Late Carboniferous, Permo-Triassic, and Lower Jurassic age, indicating different depositional environments. Petrographic analysis reveals that the formation's sandstone is composed of detrital framework grains, including monocrystalline and polycrystalline quartz, feldspars, lithic fragments, followed by iron oxides, clays, carbonates, micas, and heavy minerals. The barite concretions contain angular to very angular pure quartz grains, with monocrystalline quartz comprising 44% and polycrystalline quartz 20%. Barite, making up 42% of the cementing materi-al, sometimes penetrates and corrodes quartz grains. Based on mineral com-position, the sandstone is classified as quartzarenite (67%), sublithic arenite (21%), and subarkose (12%). Diagenetic processes have primarily reduced the original porosity through cementation rather than compaction.
Tárgyszavak:	Természettudományok Földtudományok előadáskivonat könyvrészlet Oolitic ironstone Barite Original Porosity Compaction Cementation.
Megjelenés:	Mediterranean Geosciences Union (MedGU) 4th annual meeting. - accepted for publication : - (2024), p. 1. -
További szerzők:	Rózsa Péter (1956-) (petrográfus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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