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Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin


Taylor, F and McMinn, A, Evidence from diatoms for Holocene climate fluctuation along the East Antarctic margin, The Holocene, 11, (4) pp. 455-466. ISSN 0959-6836 (2001) [Refereed Article]

DOI: doi:10.1191/095968301678302896


Diatom assemblages in two Holocene sediment cores (GC1 and GC2) from the Mac. Robertson Shelf, East Antarctica, are compared with modern sedimentary diatom assemblages from the same area. Open marine deposition commenced in Iceberg Alley (GC1), on the outer continental shelf, >10.7 adj. 14C kyr BP. Chaetoceros resting spores, which may indicate water-column stabilization from melting glacial and/or sea ice or the maximum summer sea-ice retreat, dominate the diatom assemblage. Approximately 7.5 adj. 14C kyr BP, a sea-ice diatom assemblage was deposited. This assemblage is similar to that being deposited in the surface sediments of the Mac. Robertson Shelf today and suggests that perennial sea ice has persisted in the vicinity of Iceberg Alley since that time. Interbedded within the sea-ice assemblage, however, are Corethron-rich sediment layers that suggest mid- to late-Holocene high-productivity events associated with a climatic optimum. The diatom record from Nielsen Basin (GC2), on the inner continental shelf, is relatively uniform compared to that in GC1. Glacial ice was present over the region c. >5.6 adj. 14C kyr BP and a dissolution diatom assemblage was deposited beneath it. Following ice retreat, an ice-edge diatom assemblage was deposited briefly before sea-ice conditions similar to that on the continental shelf today developed. There is no evidence in GC2 for the mid- to late-Holocene high-productivity events identified in GC1.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Palaeontology (incl. palynology)
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Taylor, F (Dr Fiona Taylor)
UTAS Author:McMinn, A (Professor Andrew McMinn)
ID Code:22317
Year Published:2001
Web of Science® Times Cited:22
Deposited By:IASOS
Deposited On:2001-08-01
Last Modified:2002-06-12

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