Seafloor environments of the northern Lord Howe Rise, Eastern Australia: Total oxygen uptake and total carbon dioxide fluxes from core incubation experiments.  

Authors / CoAuthors

Radke, L.C. | Carey, M.

Abstract

Geoscience Australia marine reconnaissance survey TAN0713 to the Lord Howe Rise offshore eastern Australia was completed as part of the Federal Government¿s Offshore Energy Security Program between 7 October and 22 November 2007 using the New Zealand Government¿s research vessel Tangaroa. The survey was designed to sample key, deep-sea environments on the east Australian margin (a relatively poorly-studied shelf region in terms of sedimentology and benthic habitats) to better define the Capel and Faust basins, which are two major sedimentary basins beneath the Lord Howe Rise. Samples recovered on the survey contribute to a better understanding of the geology of the basins and assist with an appraisal of their petroleum potential. They also add to the inventory of baseline data on deep-sea sediments in Australia. The principal scientific objectives of the survey were to: (1) characterise the physical properties of the seabed associated with the Capel and Faust basins and Gifford Guyot; (2) investigate the geological history of the Capel and Faust basins from a geophysical and geological perspective; and (3) characterise the abiotic and biotic relationships on an offshore submerged plateau, a seamount, and locations where fluid escape features were evident. This dataset comprises total oxygen uptake and total carbon fluxes from core incubation experiments. Some relevant publications which pertain to these datasets include: 1. Heap, A.D., Hughes, M., Anderson, T., Nichol, S., Hashimoto, T., Daniell, J., Przeslawski, R., Payne, D., Radke, L., and Shipboard Party, (2009). Seabed Environments and Subsurface Geology of the Capel and Faust basins and Gifford Guyot, Eastern Australia ¿ post survey report. Geoscience Australia, Record 2009/22, 166pp. 2. Radke, L.C. Heap, A.D., Douglas, G., Nichol, S., Trafford, J., Li, J., and Przeslawski, R. 2011. A geochemical characterization of deep-sea floor sediments of the northern Lord Howe Rise. Deep Sea Research II 58: 909-921

Product Type

dataset

eCat Id

90688

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Keywords

• Marine Data

Australian and New Zealand Standard Research Classification (ANZSRC)

• Marine Geoscience

• Published_Internal

Publication Date

2016-01-01T00:00:00

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Australian Government Security ClassificationSystem    

Classification - unclassified

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Creative Commons Attribution 4.0 International Licence    

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Use - license

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Purpose

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asNeeded

Topic Category

oceans

Series Information

Lineage

A 4.5cm diameter core of surface sediment overlain by 0.118L of local seawater was incubated in the dark for ~4 hours at ~26oC after a ~3 hour pre-incubation period. Dissolved oxygen levels were measured at ~30 minute intervals. Samples for DIC analysis were taken at the start and finish of the incubation. Dissolved inorganic carbon (DIC) were determined using a DIC analyser and infrared-based CO2 detector. (Geoscience Australia). CO2 and O2 production/consumption rates were calculated by concentration differences (T=1 ¿ T=0) over the incubation period.

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Extents

[-27.3448, -26.066, 159.41532, 161.77743]

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