DOI: 10.1016/j.jafrearsci.2019.103693
论文题名: Stratigraphic and lithofacies analysis of the Gohatsion Formation in the Blue Nile basin, central Ethiopia: Implications for depositional setting
作者: Chernet S.G. ; Atnafu B. ; Asrat A.
刊名: Journal of African Earth Sciences
ISSN: 1464343X
出版年: 2020
卷: 162 语种: 英语
英文关键词: Blue Nile Basin
; Depositional setting
; Evaporite
; Gohatsion formation
; Lithofacies analysis
; Sea margin sabkha belt
; Tidal flats
Scopus关键词: climate variation
; depositional environment
; evaporite
; Jurassic
; lithofacies
; lithostratigraphy
; seasonal variation
; tidal flat
; transgression
; Blue Nile Basin
; Nile Basin
英文摘要: The Gohatsion Formation consists of a cyclic intercalation of fine siliciclastic and evaporite/carbonate beds and has been subdivided into three informal members, namely the Lower Mudrock Member, the Gypsum Member and the Upper Mudrock Member. Four lithostratigraphic sections were constructed at the Gohatsion, Dejen, Mugher and Jemma localities. Lithofacies analysis of the succession at outcrop and petrographic scales indicate a broad tidal belt influenced by seasonal and regional climate and sea level changes. Integrated lithofacies depositional models for the corresponding informal members have been proposed in order to demonstrate the lithological response to local and global climate change and sea level fluctuations that occurred during the initial phase of the Tethyan Sea transgression during the early to middle Jurassic. Lithofacies of the Lower Mudrock Member show deposition within a siliciclast-dominated back barrier tidal flat system. Deposition of the Gypsum Member occurred in a marine coastal sabkha belt, whereas the Upper Mudrock Member was deposited in a broad coastal shelf prone to seasonal marine flooding. The models show that all the members of the Gohatsion Formation were formed within a broad coastal tidal belt with continental influence and sediment delivery from the northwest, and a slowly encroaching transgressive marine influence from the southeast. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159811
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: School of Earth Sciences, Addis Ababa University, Addis Ababa, P.O. Box 1176, Ethiopia
Recommended Citation:
Chernet S.G.,Atnafu B.,Asrat A.. Stratigraphic and lithofacies analysis of the Gohatsion Formation in the Blue Nile basin, central Ethiopia: Implications for depositional setting[J]. Journal of African Earth Sciences,2020-01-01,162