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- W2013843089 abstract "Neodymium and strontium isotopic systematics show that terrestrial phosphorus (P) entering the inner Great Barrier Reef (GBR) is dominated by the transport and dispersal of fine-grained basaltic soils. Soils derived from alkali basalts have high total P (3000–4000 mg/kg) and distinctive 143Nd/144Nd isotopic signatures (ϵNd∼+3 to +5), while the more common Palaeozoic granitic/metamorphic soils have much lower total P (300–600 mg/kg) and 143Nd isotopic signatures (ϵNd∼−8). The nearshore environment (<5 km from the coast) is dominated by coarse-grained, granitic-derived fluvial detritus, while >20 km from the coast, carbonate-rich sediments with increasing contributions from basaltic components become more important. In the offshore sites adjacent to coral reefs, it is shown that basalt-derived sediments can account for >90% of the terrestrial P, although making up less than half of the total terrigenous detritus. Equilibrium phosphorus concentration measurements on the marine sediments indicate that P enters the GBR lagoon via a two-stage process. Firstly, during episodic flood events, P is transported into the GBR lagoon on P-retentive fine-grained suspended sediments, with only minor desorption of P occurring in the low-salinity flood plumes. Desorption of P mainly occurs over longer timescales, predominantly in regions of sediment anoxia, with release of PO43− directly into marine pore waters probably via reduction of ferric phosphates, and subsequent release into the water column by re-suspension. This process causes P depletion of the re-deposited sediments." @default.
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- W2013843089 date "2003-05-01" @default.
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- W2013843089 title "Tracing the source of sediment and phosphorus into the Great Barrier Reef lagoon" @default.
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