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Paleodepth determination from Antarctic benthic diatom assemblages

Citation

Whitehead, JM and McMinn, A, Paleodepth determination from Antarctic benthic diatom assemblages, Marine Micropaleontology, 29, (3-4) pp. 301-318. ISSN 0377-8398 (1997) [Refereed Article]

DOI: doi:10.1016/S0377-8398(96)00036-9

Abstract

Analysis of modem surface sediments from fjords in the Vestfold Hills (Antarctica) indicates that 58% of the variation in benthic diatom assemblages can be attributed to changes in environmental parameters with water depth. Attenuation of light through the water column is suggested to account for 45% of the variation, and the decrease in substrate grain size with depth possibly accounts for a further 13%. Cluster analysis and principal component analysis were used to objectively circumscribe five floral zones between the surface and 35 m depth. The depth distribution of the benthic diatoms was then used to interpret the paleodepth of relict fjord (Holocene) sediments exposed around Deep Lake in the Death Valley (Vestfold Hills). Paleodepths measured from the sea-ice bench around Deep Lake combined with data from grain size analysis indicate that the relict fjord sediments have no analogue amongst the modem fjord sediments sampled in the Vestfold Hills. Without a comparable modem habitat on which to model the diatom depth zones, however, this study was unable to accurately determine the paleowater depth at Deep Lake using diatoms. Paleodepth determination will be possible using grain size analysis and diatom dam when the substrate and light requirements of benthic diatoms are understood.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Palaeontology (incl. Palynology)
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Environment not elsewhere classified
Author:Whitehead, JM (Dr Jason Whitehead)
Author:McMinn, A (Professor Andrew McMinn)
ID Code:10763
Year Published:1997
Web of Science® Times Cited:18
Deposited By:IASOS
Deposited On:1997-08-01
Last Modified:2011-08-11
Downloads:0

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