Geochemistry of the mudrocks and sandstones from the Bredasdorp Basin, offshore South Africa: Implications for tectonic provenance and paleoweathering

An inorganic geochemical investigation of mudrocks and sandstone from the southern Bredasdorp Basin, off the south coast of South Africa was carried out to unravel the provenance, paleoweathering, and tectonic setting of the basin. Seventy-seven representative samples from exploration wells E-AH1, E...

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Autores principales:	Baiyegunhi Temitope Love, Liu Kuiwu, Gwavava Oswald, Baiyegunhi Christopher, Rapholo Maropene
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	geochemistry provenance weathering tectonic setting bredasdorp basin Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/3e955b6147934125a0dbbe1f2dd4dc02
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spelling	oai:doaj.org-article:3e955b6147934125a0dbbe1f2dd4dc022021-12-05T14:10:48ZGeochemistry of the mudrocks and sandstones from the Bredasdorp Basin, offshore South Africa: Implications for tectonic provenance and paleoweathering2391-544710.1515/geo-2020-0260https://doaj.org/article/3e955b6147934125a0dbbe1f2dd4dc022021-10-01T00:00:00Zhttps://doi.org/10.1515/geo-2020-0260https://doaj.org/toc/2391-5447An inorganic geochemical investigation of mudrocks and sandstone from the southern Bredasdorp Basin, off the south coast of South Africa was carried out to unravel the provenance, paleoweathering, and tectonic setting of the basin. Seventy-seven representative samples from exploration wells E-AH1, E-AJ1, E-BA1, E-BB1, and E-D3 underwent geochemical analysis involving major and trace elements. The major oxide compositions show that the sandstones could be classified as sub-arkose and sub-lithic arenite. The provenance discrimination diagrams based on major oxide geochemistry revealed that the sandstones are mainly of quartzose sedimentary provenance, while the mudrocks are of quartzose sedimentary and intermediate igneous provenances. The discrimination diagrams indicate that the Bredasdorp sediments were mostly derived from a cratonic interior or recycled orogen. The bivariate plots of TiO2 versus Ni, TiO2 against Zr, and La/Th versus Hf as well as the ternary diagrams of V–Ni–Th∗10 suggest that the mudrocks and sandstones were derived from felsic igneous rocks. The tectonic setting discrimination diagrams support passive-active continental margin setting of the provenance. Also, the closely similar compositions of the analysed samples and recent sedimentary rocks of the East African Rift System perhaps suggest a rifted basin tectonic setting for the Bredasdorp Basin. Chemical index of alteration (CIA) indices observed in the sandstones suggest that their source area underwent low to moderate degree of chemical weathering. However, the mudrocks have high CIA indices suggesting that the source area underwent more intense chemical weathering, possibly due to climatic and/or tectonic variations.Baiyegunhi Temitope LoveLiu KuiwuGwavava OswaldBaiyegunhi ChristopherRapholo MaropeneDe Gruyterarticlegeochemistryprovenanceweatheringtectonic settingbredasdorp basinGeologyQE1-996.5ENOpen Geosciences, Vol 13, Iss 1, Pp 1187-1225 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	geochemistry provenance weathering tectonic setting bredasdorp basin Geology QE1-996.5
spellingShingle	geochemistry provenance weathering tectonic setting bredasdorp basin Geology QE1-996.5 Baiyegunhi Temitope Love Liu Kuiwu Gwavava Oswald Baiyegunhi Christopher Rapholo Maropene Geochemistry of the mudrocks and sandstones from the Bredasdorp Basin, offshore South Africa: Implications for tectonic provenance and paleoweathering
description	An inorganic geochemical investigation of mudrocks and sandstone from the southern Bredasdorp Basin, off the south coast of South Africa was carried out to unravel the provenance, paleoweathering, and tectonic setting of the basin. Seventy-seven representative samples from exploration wells E-AH1, E-AJ1, E-BA1, E-BB1, and E-D3 underwent geochemical analysis involving major and trace elements. The major oxide compositions show that the sandstones could be classified as sub-arkose and sub-lithic arenite. The provenance discrimination diagrams based on major oxide geochemistry revealed that the sandstones are mainly of quartzose sedimentary provenance, while the mudrocks are of quartzose sedimentary and intermediate igneous provenances. The discrimination diagrams indicate that the Bredasdorp sediments were mostly derived from a cratonic interior or recycled orogen. The bivariate plots of TiO2 versus Ni, TiO2 against Zr, and La/Th versus Hf as well as the ternary diagrams of V–Ni–Th∗10 suggest that the mudrocks and sandstones were derived from felsic igneous rocks. The tectonic setting discrimination diagrams support passive-active continental margin setting of the provenance. Also, the closely similar compositions of the analysed samples and recent sedimentary rocks of the East African Rift System perhaps suggest a rifted basin tectonic setting for the Bredasdorp Basin. Chemical index of alteration (CIA) indices observed in the sandstones suggest that their source area underwent low to moderate degree of chemical weathering. However, the mudrocks have high CIA indices suggesting that the source area underwent more intense chemical weathering, possibly due to climatic and/or tectonic variations.
format	article
author	Baiyegunhi Temitope Love Liu Kuiwu Gwavava Oswald Baiyegunhi Christopher Rapholo Maropene
author_facet	Baiyegunhi Temitope Love Liu Kuiwu Gwavava Oswald Baiyegunhi Christopher Rapholo Maropene
author_sort	Baiyegunhi Temitope Love
title	Geochemistry of the mudrocks and sandstones from the Bredasdorp Basin, offshore South Africa: Implications for tectonic provenance and paleoweathering
title_short	Geochemistry of the mudrocks and sandstones from the Bredasdorp Basin, offshore South Africa: Implications for tectonic provenance and paleoweathering
title_full	Geochemistry of the mudrocks and sandstones from the Bredasdorp Basin, offshore South Africa: Implications for tectonic provenance and paleoweathering
title_fullStr	Geochemistry of the mudrocks and sandstones from the Bredasdorp Basin, offshore South Africa: Implications for tectonic provenance and paleoweathering
title_full_unstemmed	Geochemistry of the mudrocks and sandstones from the Bredasdorp Basin, offshore South Africa: Implications for tectonic provenance and paleoweathering
title_sort	geochemistry of the mudrocks and sandstones from the bredasdorp basin, offshore south africa: implications for tectonic provenance and paleoweathering
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/3e955b6147934125a0dbbe1f2dd4dc02
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Geochemistry of the mudrocks and sandstones from the Bredasdorp Basin, offshore South Africa: Implications for tectonic provenance and paleoweathering

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