Skip navigation

Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.advisorDr. Balemual Atnafuen_US
dc.contributor.authorAmente, Beksa-
dc.descriptionA Thesis Submitted to the School of Graduate Studies of Addis Ababa University in Partial Fulfillment of the Requirements for the Degree of Master of Science in Earth Sciences (Paleontology and Paleoenvironment)en_US
dc.description.abstractShanan section is situated in Southeastern Ethiopian plateau has a thick succession of carbonate rocks. These studies generally considered the stratigraphy, paleontology, microfacies analysis, biostratigraphy and determine depositional environments of Shanan section carbonates. Based on thin section analysis of 40 samples collected the compositional and textural types of rocks were studied and grouped into six microfacies associations which are characteristic for lagoon, platform margin, foreshoal and offshore environments. The presences of micritic, bioclastic wackestone and peloidal grainstone microfacies at lower Shanan indicate lagoon deposits. The Bioclastic peloidal grainstone and ooilitic grainstone facies present following the lagoon facies carbonates are indicators of carbonate shoal/barrier deposits of shallow marine setting .The middle Shanan layers conformably overlies the lower Shanan and consists of the foreshoal microfacies of thick, allochemical rich wackestone-grainstone limestone’s, mainly dominated by reworked intraclastic grains. A low energy deposit of offshore environment is characterized by fine grained dark gray blackish micritic limestones with some cherts present at upper Shanan section. The overall microfacies and facies successions throughout the unit show that the environments ranges from lagoon, high energy platform margin carbonate sand bodies, foreshoal deposits and offshore deposits successively from bottom to top. Based on the presence of index fossils of Pfenderina cf.salernitana and Kurnubia palastiniensisthe age of this carbonate rocks determined to be Callovian to Oxfordian time. Paleontological study of Shanan section shows that the carbonates are rich in macro and microfossils that supply additional data for stratigraphic and paleoenvironmental interpretations. Eoguttulina polygona, Lenticulina subalata, Lenticulina quenstedti, Verneuilinoides minuata, Haplophragmoides bartensteini and Choffatella.sp, are species of foraminifera collected also 5 genera of ostracods such as, Cytherelloidea.sp., Progonocythere.sp., Procytheridea.sp., Bairdia.sp, and Paracypris.sp are identified. From macrofossils different species of bivalves, gastropods and brachiopods are also identified.The carbonate deposits of the section are correlated with some of equivalent deposits in Southeastern plateau and major regional sedimentary basins of Ethiopia.en_US
dc.description.sponsorshipAddis Ababa Universityen_US
dc.publisherAddis Ababa Universityen_US
dc.subjectDepositional Environmenten_US
dc.subjectShanan Sectionen_US
dc.subjectSoutheastern Ethiopiaen_US
dc.titleMicrofacies Analysis and Paleontology of Carbonate Rocks in Shanan Section; South Eastern Ethiopiaen_US
Appears in Collections:Thesis-Paleoanthropology and Paleoenvironment

Files in This Item:
File Description SizeFormat 
Beksa Amente Kumsa.pdf4.43 MBAdobe PDFView/Open
Show simple item record

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.