Irena Zagorskis
Australian Institute of Marine Science
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Geo-marine Letters | 1995
Gregg J. Brunskill; Irena Zagorskis; Ken J. Woolfe
The tectonically active islands of the Indo-Pacific Archipelago deliver much sediment to the ocean margins. In the Gulf of Papua on the south coast of Papua New Guinea (PNG), the chemical composition of surface sediment from grab samples indicates that Fly River muds are dispersed to the north and east, where they are joined by sediment plumes from the other large rivers along the south coast of PNG. This is the likely source of terrestrial sediment on the Papuan Plateau and the northern Coral Sea Abyssal Plain. The sediment is transported through submarine troughs and canyons offshore, far to the east of the riverine inputs. Immediately south and 30–50 km offshore from the Fly and Purari deltas is a platform of algal and reef carbonate materials, containing little or no terrestrial surface sediment.
Geochimica et Cosmochimica Acta | 2003
Gregg J. Brunskill; Irena Zagorskis; John Pfitzner
A mass balance has been calculated for the elements Li, B, and Sr in the Gulf of Papua from sampling undertaken during 1993 to 1999. Parameters measured included Fly, Kikori, and Purari River inputs of dissolved and particulate phases, removal flux to sediment traps at the base of the continental shelf slope, and century-scale accumulation rates in shelf and slope sediments (derived from excess 210Pb profiles in sediment cores). About 91% of river input Li was in particulate form, and there was conservative behavior of dissolved Li in the salinity gradient of the estuaries. Li accumulation rate in inner-shelf sediments was slightly less than river inputs, suggesting that more than 90% of Li river inputs were trapped in rapid aluminosilicate mud accumulation zones of the inner shelf (<50-m depth). Li removal rate to sediment traps at the base of the slope at ∼1000-m water depth was an order of magnitude smaller than the inner-shelf sedimentation. Export of Li to deep water Coral Sea was estimated to be 1.2 × 108 mol yr−1, and this amount is equivalent to the riverine dissolved Li annual supply rate. About 66% of river input of B was in the particulate phase, and low dissolved B concentrations in freshwater were conservatively mixed with higher concentrations of B in seawater across the salinity gradient. Removal of B to inner-shelf sediments was about 83% of the total river input, indicating a small export of B (1.2 × 108 mol yr−1) to the Coral Sea. About half of the dissolved B input from rivers is sorbed to particles and trapped in inner-shelf sediments. Only 24% of river input of Sr was in particulate form, and low freshwater concentrations of dissolved Sr were conservatively mixed with higher concentrations of Sr in seawater across the salinity gradient. Only 20% of total river inputs of Sr were buried in shelf sediments, and there was a large export (7.3 × 108 mol yr−1) of Sr off the shelf to the Coral Sea. A sediment core from a rapidly accumulating mud deposition zone of the inner shelf shows twofold sympathetic variations in Li, B, and Sr/Ca supply rates over 200- to 1000-yr time intervals.
Marine Pollution Bulletin | 2012
Britta Schaffelke; J. H. Carleton; Michele Skuza; Irena Zagorskis; Miles Furnas
Journal of Environmental Radioactivity | 2004
John Pfitzner; Gregg J. Brunskill; Irena Zagorskis
Estuarine Coastal and Shelf Science | 2013
Katharina E. Fabricius; Glenn De’ath; Craig Humphrey; Irena Zagorskis; Britta Schaffelke
Estuarine Coastal and Shelf Science | 2002
Gregg J. Brunskill; Irena Zagorskis; John Pfitzner
Geochimica et Cosmochimica Acta | 2007
Ph. Monbet; G.J. Brunskill; Irena Zagorskis; John Pfitzner
Continental Shelf Research | 2008
Kathryn A. Burns; Gregg J. Brunskill; Diane Brinkman; Irena Zagorskis
Archive | 2009
Britta Schaffelke; Angus Thompson; J. H. Carleton; Johnston Davidson; Jason Doyle; Miles Furnas; Kevin Gunn; Michele Skuza; Margaret Wright; Irena Zagorskis
Continental Shelf Research | 2001
Gregg J. Brunskill; Alan R. Orpin; Irena Zagorskis; Kj Woolfe; Jc Ellison