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A geochemical characterisation of deep-sea floor sediments of the northern Lord Howe Rise

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Created 13/01/2025

Updated 13/01/2025

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This study presents new information on the regional geochemical characteristics of deep-sea floor sediments (1300 - 2423 m water depth) on the Lord Howe Rise (deep-sea plateau) and Gifford Guyot (seamount/tablemount), remote areas off eastern Australia. The aim was to provide a coherent synthesis for a suite of geochemical data that can be used to make habitat inferences and to develop surrogates of biodiversity. Sediment characteristics analysed were mineralogy, organic carbon and nitrogen concentrations and isotopic compositions, and concentrations of major and trace elements. We also measured parameters that convey information about the reactivity of organic matter and on the bio-availability of bioactive trace elements (e.g. chlorin indices and acid-extractable elements). Surface sediments from the region were calcareous oozes that were carbon-lean (0.26±0.1%) and had moderate to high chlorin indices (0.62 - 0.97)..

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Title A geochemical characterisation of deep-sea floor sediments of the northern Lord Howe Rise
Language eng
Licence notspecified
Landing Page https://devweb.dga.links.com.au/data/dataset/735f714f-663d-4ebc-a20a-adb7b8f26c98
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage {"type": "Polygon", "coordinates": [[[159.0, -32.0], [159.5, -32.0], [159.5, -31.0], [159.0, -31.0], [159.0, -32.0]]]}
Data Portal data.gov.au