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GEOREF RECORD

Abrasion of Foraminifera tests along an active dune cordon, Western Cape, South Africa

Giuliana Franceschini and John S. Compton
Abrasion of Foraminifera tests along an active dune cordon, Western Cape, South Africa
Palaios (December 2007) 22 (6): 686-690

Abstract

Intricate morphology, combined with relatively soft and soluble calcite mineralogy, make foraminifera tests sensitive indicators of grain abrasion during transport in beach and coastal dune systems. Here, the extent of abrasion and dissolution of foraminifera tests is used to elucidate the relative ages and transport paths of sand from the Sixteen Mile Beach and 24-km-long Yzerfontein-Geelbek Holocene dune cordon on the west coast of southern Africa, located 80 km north of Cape Town. Foraminifera tests collected in rocky pools along the beach are well preserved with complete or nearly complete tests. Foraminifera tests recovered from adjacent beach sands show incipient signs of abrasion and are fragmented moderately and abraded from transport along the shoreface. Wind-blown foraminifera tests along the Yzerfontein-Geelbek active dune cordon show increasing signs of abrasion, corroded surfaces, and partly dissolved walls up to 18 km from the beach source. Between 18 km and 24 km from the beach source, most biogenic calcareous grains--shell fragments and foraminifera tests--in dune sand with an estimated maximum age of 4,500 years have been destroyed by physical and chemical weathering.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 22
Serial Issue: 6
Title: Abrasion of Foraminifera tests along an active dune cordon, Western Cape, South Africa
Affiliation: University of Cape Town, Department of Geological Sciences, Rondebosch, South Africa
Pages: 686-690
Published: 200712
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 19
Accession Number: 2008-002126
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
S33°15'00" - S33°04'60", E18°00'00" - E18°10'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, 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: 200802
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