ODP cores 1130 and 1132 recovered from the upper continental slope of the Great Australian Bight, reveal that greater than 250 meters of primarily cool-water carbonate packstones have been deposited throughout the Pleistocene at rates in excess of 25 cm/ka. Core 1132 is capped by m-scale bryozoan-rich intervals, which have subsequently been interpreted to represent in place mound growth during the late Pleistocene. Textural and compositional analyses conducted on over 700 samples from the two sites indicate an overall shallowing-upward sequence. Superimposed upon this is a m-scale alternation of light-colored, fine-grained, carbonate-rich sediments consisting dominantly of low-mg calcite, with dark-colored, coarser-grained high-mg calcite units rich in bryozoans. Although the precise timing of events have not yet been established, the data suggest a cyclic pattern of sediment input from the adjacent shelf, punctuated by periods of dominantly pelagic input. This high frequency depositional pattern takes place against the backdrop of overall shelf-margin progradation.

West: 127.3608 East: 127.3608 North: -33.1858 South: -33.2512

Expedition: 182

Site: 182-1130

Site: 182-1132

Provider: SEDIS Publication Catalogue

Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=2004-013120 (c.f. for more detailed metadata)

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