Age and paleo-environmental evolution of the Douala Basin (Cameroon) during the Cenozoic: insights from palynology and sequence analysis

The Douala basin in Cameroon is one of the West African basins created during the opening of the South Atlantic Ocean after the break-up of the Gondwana superstructure. Until now, no detailed studies of age and paleo-environmental evolution of this basin during the Cenozoic have been carried out, es...

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Autores principales:	B.C. Mfayakouo, P.R.N. Ngaha, D.L. Bitom
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Palynomorph assemblages Depositional sequence Paleo-environment Cenozoic Douala basin Cameroon Science (General) Q1-390 Social sciences (General) H1-99
Acceso en línea:	https://doaj.org/article/a648686d3c22427a8e017997128d55a1
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spelling	oai:doaj.org-article:a648686d3c22427a8e017997128d55a12021-12-04T04:35:27ZAge and paleo-environmental evolution of the Douala Basin (Cameroon) during the Cenozoic: insights from palynology and sequence analysis2405-844010.1016/j.heliyon.2021.e08514https://doaj.org/article/a648686d3c22427a8e017997128d55a12021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2405844021026177https://doaj.org/toc/2405-8440The Douala basin in Cameroon is one of the West African basins created during the opening of the South Atlantic Ocean after the break-up of the Gondwana superstructure. Until now, no detailed studies of age and paleo-environmental evolution of this basin during the Cenozoic have been carried out, especially on outcrops sections. Palynological and sequence analyses have been performed on the outcrops in the Missole I and Dibamba localities in the central part of this basin. This integrated approach allow us propose a new age and paleo-environmental evolution of the Douala Basin. Three palynomorph assemblages have been identified: (i) the Paleocene-Eocene palynomorph assemblage (A) from the Missole I deposits; (ii) the Oligocene palynomorph assemblage (B) from the lower part of the Dibamba deposits; and (iii) the Lower to Middle Miocene palynomorph assemblages (C) from the upper part of the Dibamba deposits. Sequence analysis indicates four depositional sequences with a vertical succession, characterized by major transgressive depositional sequences (depositional sequence “a”, “b”, and “c”), and a minor regressive depositional sequence (“d”). The trangressive sequences were deposited in lagoon or marginal marine environments during Paleocene-Eocene, while the regressive sequence was deposited in prograding continental shelf during the Oligocene-Middle Miocene. The recognized depositional sequence and associated depositional environments were controlled by spasmodic subsidence, margin uplift and climatic variations. Climate evolved from a wet-dry subtropical to tropical during the Paleocene-Eocene and a warm humid subtropical during the Oligocene up to Lower Middle Miocene with overall shift of the Douala basin from the Southern to the Northern hemisphere. This study reveals the existence of Oligocene deposits (Souellaba Formation) in the outcrops and could be useful for future correlation with the offshore part of the Douala Basin.B.C. MfayakouoP.R.N. NgahaD.L. BitomElsevierarticlePalynomorph assemblagesDepositional sequencePaleo-environmentCenozoicDouala basinCameroonScience (General)Q1-390Social sciences (General)H1-99ENHeliyon, Vol 7, Iss 12, Pp e08514- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Palynomorph assemblages Depositional sequence Paleo-environment Cenozoic Douala basin Cameroon Science (General) Q1-390 Social sciences (General) H1-99
spellingShingle	Palynomorph assemblages Depositional sequence Paleo-environment Cenozoic Douala basin Cameroon Science (General) Q1-390 Social sciences (General) H1-99 B.C. Mfayakouo P.R.N. Ngaha D.L. Bitom Age and paleo-environmental evolution of the Douala Basin (Cameroon) during the Cenozoic: insights from palynology and sequence analysis
description	The Douala basin in Cameroon is one of the West African basins created during the opening of the South Atlantic Ocean after the break-up of the Gondwana superstructure. Until now, no detailed studies of age and paleo-environmental evolution of this basin during the Cenozoic have been carried out, especially on outcrops sections. Palynological and sequence analyses have been performed on the outcrops in the Missole I and Dibamba localities in the central part of this basin. This integrated approach allow us propose a new age and paleo-environmental evolution of the Douala Basin. Three palynomorph assemblages have been identified: (i) the Paleocene-Eocene palynomorph assemblage (A) from the Missole I deposits; (ii) the Oligocene palynomorph assemblage (B) from the lower part of the Dibamba deposits; and (iii) the Lower to Middle Miocene palynomorph assemblages (C) from the upper part of the Dibamba deposits. Sequence analysis indicates four depositional sequences with a vertical succession, characterized by major transgressive depositional sequences (depositional sequence “a”, “b”, and “c”), and a minor regressive depositional sequence (“d”). The trangressive sequences were deposited in lagoon or marginal marine environments during Paleocene-Eocene, while the regressive sequence was deposited in prograding continental shelf during the Oligocene-Middle Miocene. The recognized depositional sequence and associated depositional environments were controlled by spasmodic subsidence, margin uplift and climatic variations. Climate evolved from a wet-dry subtropical to tropical during the Paleocene-Eocene and a warm humid subtropical during the Oligocene up to Lower Middle Miocene with overall shift of the Douala basin from the Southern to the Northern hemisphere. This study reveals the existence of Oligocene deposits (Souellaba Formation) in the outcrops and could be useful for future correlation with the offshore part of the Douala Basin.
format	article
author	B.C. Mfayakouo P.R.N. Ngaha D.L. Bitom
author_facet	B.C. Mfayakouo P.R.N. Ngaha D.L. Bitom
author_sort	B.C. Mfayakouo
title	Age and paleo-environmental evolution of the Douala Basin (Cameroon) during the Cenozoic: insights from palynology and sequence analysis
title_short	Age and paleo-environmental evolution of the Douala Basin (Cameroon) during the Cenozoic: insights from palynology and sequence analysis
title_full	Age and paleo-environmental evolution of the Douala Basin (Cameroon) during the Cenozoic: insights from palynology and sequence analysis
title_fullStr	Age and paleo-environmental evolution of the Douala Basin (Cameroon) during the Cenozoic: insights from palynology and sequence analysis
title_full_unstemmed	Age and paleo-environmental evolution of the Douala Basin (Cameroon) during the Cenozoic: insights from palynology and sequence analysis
title_sort	age and paleo-environmental evolution of the douala basin (cameroon) during the cenozoic: insights from palynology and sequence analysis
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/a648686d3c22427a8e017997128d55a1
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Age and paleo-environmental evolution of the Douala Basin (Cameroon) during the Cenozoic: insights from palynology and sequence analysis

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