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Eifelian-Givetian (Middle Devonian) high-paleolatitude storm- and wave-dominated shallow-marine depositional systems from the Bidouw Subgroup (Bokkeveld Group) of South Africa

Cameron R. Penn-Clarke, Bruce S. Rubidge and Zubair A. Jinnah
Eifelian-Givetian (Middle Devonian) high-paleolatitude storm- and wave-dominated shallow-marine depositional systems from the Bidouw Subgroup (Bokkeveld Group) of South Africa
Journal of Sedimentary Research (November 2019) 89 (11): 1140-1170

Abstract

The sedimentology of the Eifelian-Givetian (Middle Devonian) Bidouw Subgroup in the Clanwilliam Sub-basin of South Africa has been reassessed. Four distinct lithofacies associations are recognized (A-D) and are representative of the deposits of offshore (Os), offshore transition zone to distal lower shoreface (OTZ-dLSF), proximal lower shoreface (pLSF), and upper shoreface-beach (USF-Beach) paleoenvironments. These paleoenvironments are arranged as several T-R-controlled storm- and wave-dominated shallow-marine depositional systems. The presence of storm- and wave-dominated shallow-marine depositional systems in the Bidouw Subgroup, as well as the preceding Emsian-Eifelian (Early-Middle Devonian) Ceres Subgroup provides an alternative explanation to storm- and wave-dominated delta and mixed wave- and-tide-dominated delta models that have previously been proposed for the Bokkeveld Group. Sequence-stratigraphic analysis of the Bidouw Subgroup suggests that although sedimentation occurred during two large-scale second-order transgressive events, the succession was predominantly regressive. Third-order and fourth-order transgressive-regressive (T-R) sequences are more numerous with respect to the preceding Ceres Subgroup, suggesting that the driver for T-R cyclicity and relative sea-level change was more active during the Eifelian-Givetian than in the Emsian-Eifelian of South Africa. These data are important since relative sea-level change and its effects on paleoenvironmental change at high paleolatitudes during the Devonian Period are poorly known.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 89
Serial Issue: 11
Title: Eifelian-Givetian (Middle Devonian) high-paleolatitude storm- and wave-dominated shallow-marine depositional systems from the Bidouw Subgroup (Bokkeveld Group) of South Africa
Affiliation: University of the Witwatersrand, Evolutionary Studies Institute, Johannesburg, South Africa
Pages: 1140-1170
Published: 201911
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 144
Accession Number: 2020-003920
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 1 table, geol. sketch maps
S32°25'60" - S32°25'60", E19°04'60" - E19°04'60"
S32°10'60" - S32°10'60", E18°53'60" - E18°53'60"
Secondary Affiliation: Iziko Museums of South Africa, ZAF, South Africa
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 202004
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