Pliocene-Pleistocene climate change, sea level and uplift history recorded by the Horingbaai fan-delta, NW Namibia

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doi: 10.1016/j.sedgeo.2014.05.008
Author(s): Stollhofen, Harald; Stanistreet, Ian G.; von Hagke, Christoph; Nguno, Anna
Author Affiliation(s): Primary:
Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
Other:
University of Liverpool, United Kingdom
California Institute of Technology, United States
Geological Survey of Namibia, Namibia
Volume Title: Sedimentary Geology
Source: Sedimentary Geology, Vol.309, p.15-32. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0037-0738 CODEN: SEGEBX
Note: In English. 90 refs.; illus., incl. charts, 3 tables, geol. sketch maps
Summary: Its location on a tectonically relatively stable passive margin and its degree of interaction with the sea make the Horingbaai fan-delta, NW Namibia, an exceptional record of coastal activity, providing insights into the response of ephemeral fluvial systems to changes in climate, sea level and continent-scale uplift. The fan comprises upper, middle and lower segments. The upper fan and middle fan are dominated by a braided river system; only in the upper fan are fluvial sediments interleaved with hyperconcentrated flow deposits. Plio-Pleistocene sea level highstands have left marine terraces on the fan surface which enable correlation with the offshore marine record and provide timelines to constrain fan growth. The bulk of fan-delta progradation took place at ∼ 2.7-2.4 Ma, between the formation of a widespread erosional surface incising the middle Pliocene Karpfenkliff and Kamberg Formations, but prior to the emplacement of the warm-water fauna-bearing late Pliocene "Oyster Terrace" (∼ 2.4-2.2 Ma), an equivalent of the + 30 mP (marine terrace package) in coastal southwestern Africa. Major fan progradation is contemporaneous with widespread regional uplift (∼ 12 ± 5 m/Ma) and climate change in southwestern Africa, the latter associated with intensification of northern hemisphere glaciations. Younger fan growth phases are weaker and constrained by < 10 m asl marine terrace bodies that yield mostly cold-water fauna, corresponding to the onset of strong glacial/interglacial climatic fluctuations superimposed on a general aridification trend and the introduction of colder sea-surface temperatures after 2.2 Ma. Abstract Copyright (2014) Elsevier, B.V.
Year of Publication: 2014
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Africa; Alluvial fans; Atlantic Ocean; Biostratigraphy; Bivalvia; Cape Basin; Cenozoic; Climate change; Deltas; Depositional environment; Eocene; Ephemeral streams; Fan deltas; Fissurella; Gastropoda; Geomorphology; Holocene; Horingbaii Fan; Hyperconcentrated flows; Invertebrata; Koigab Fan; Landform evolution; Leg 175; Lithofacies; Lower Holocene; Marine terraces; Messum Fan; Mollusca; Namibia; Neogene; Northwestern Namibia; ODP Site 1082; Ocean Drilling Program; Orawab Fan; Ostreidae; Ostreoidea; Oswater Formation; Paleoclimatology; Paleogene; Pleistocene; Pliocene; Quaternary; Rates; Salt Fan; Sea-level changes; Sedimentary structures; Sedimentology; Sediments; Shore features; Skeleton Coast; South Atlantic; South Fan; Southern Africa; Streams; Tertiary; Uplifts
Coordinates: S210539 S210539 E0114914 E0114914
S214100 S212800 E0141000 E0135200
Record ID: 2014064729
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands