Seabed environments and shallow geology of the Leveque Shelf, Browse Basin, Western Australia: Total organic carbon (TOC) and total nitrogen concentrations and isotopes of seabed sediments.  

Authors / CoAuthors

Radke, L.C.

Abstract

Geoscience Australia undertook a marine survey of the Leveque Shelf (survey number SOL5754/GA0340), a sub-basin of the Browse Basin, in May 2013. This survey provides seabed and shallow geological information to support an assessment of the CO2 storage potential of the Browse sedimentary basin. The basin, located on the Northwest Shelf, Western Australia, was previously identified by the Carbon Storage Taskforce (2009) as potentially suitable for CO2 storage. The survey was undertaken under the Australian Government's National CO2 Infrastructure Plan (NCIP) to help identify sites suitable for the long term storage of CO2 within reasonable distances of major sources of CO2 emissions. The principal aim of the Leveque Shelf marine survey was to look for evidence of any past or current gas or fluid seepage at the seabed, and to determine whether these features are related to structures (e.g. faults) in the Leveque Shelf area that may extend to the seabed. The survey also mapped seabed habitats and biota to provide information on communities and biophysical features that may be associated with seepage. This research, combined with deeper geological studies undertaken concurrently, addresses key questions on the potential for containment of CO2 in the basin's proposed CO2 storage unit, i.e. the basal sedimentary section (Late Jurassic and Early Cretaceous), and the regional integrity of the Jamieson Formation (the seal unit overlying the main reservoir). This dataset comprises total chlorin concentrations and chlorin indices from the upper 2cm of seabed sediments.

Product Type

dataset

eCat Id

78965

Contact for the resource

Digital Object Identifier

http://dx.doi.org/10.4225/25/54B8638C818D2

Keywords

• Marine Data

( Theme )

• marine environmental baselines

( Theme )

• continental shelf

( Theme )

• seabed

( Theme )

• geochemistry

( Theme )

• marine

• AU-WA

Australian and New Zealand Standard Research Classification (ANZSRC)

• Marine Geoscience

• Published_External

Publication Date

2014-01-01T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

Purpose

Maintenance Information

asNeeded

Topic Category

oceans

Series Information

Lineage

Bottom sediments were collected using either a Smith McIntyre grab or a Shipek grab. Surface sediments (~0-2 cm) within the grab were spooned into falcon vials and the porewaters were removed by centrifugation. The samples were then frozen for transport to the laboratories at Geoscience Australia where they were freeze-dried, ground in a tungsten carbide mill and decarbonated. The decarbonated powders were sent to Environmental Isotopes Pty Ltd (Sydney) for isotopic analysis by mass spectrometry. Samples were back-corrected to account for the carbonate removal, using carbonate concentrations derived from the bomb method. Accuracy of the C and N isotopes are +/-0.15. Thanks to the crew of the RV Solander for assistance with sample collection, Tony Watson for decarbonating the samples, Junhong Chen for sample administration and Anita Andrews (Environmental Isotopes Pty Ltd) for undertaking the analyses.

Parent Information

Extents

[-16.1, -15.45, 121.1, 121.75]

Reference System

Spatial Resolution

Service Information

Associations

Downloads and Links

Link to data package - Seabed environments and shallow geology of the Leveque Shelf  

Download the spreadsheet (xlsx)  

Source Information

Unknown