Geoscience Australia Marine Survey GA0332 (SS05/2011): Natural hydrocarbon seepage survey of the offshore northern Perth Basin - Mineralogy of seabed sediments.

In September and October of 2011 Geoscience Australia surveyed part of the offshore northern Perth Basin in order to map potential sites of natural hydrocarbon seepage. The primary objectives of the survey were to map the spatial distribution of seepage sites and characterise the nature of the seepage at these sites (gas vs oil, macroseepage vs microseepage; palaeo vs modern day seepage) on the basis of: acoustic signatures in the water column, shallow subsurface and on the seabed; geochemical signatures in rock and sediment samples and the water column; and biological signatures on the seabed. Areas of potential natural hydrocarbon seepage that were surveyed included proven (drilled) oil and gas accumulations, a breached structure, undrilled hydrocarbon prospects, and areas with potential signatures of fluid seepage identified in seismic, satellite remote sensing and multibeam bathymetry data. Within each of these areas the survey acquired: water column measurements with the CTD; acoustic data with single- and multi-beam echosounders, sidescan sonar and sub-bottom profiler (sidescan not acquired in Area F as it was too deep in places); and sediment and biological samples with the Smith-McIntyre Grab. In addition, data were collected with a remotely operated vehicle (ROV), integrated hydrocarbon sensor array, and CO2 sensor in selected areas. Sampling with the gravity corer had limited success in many of the more shallow areas (A-E) due to the coarse sandy nature of the seabed sediments. This dataset comprises mineraology of the upper 2cm of seabed sediment. The mineral assemblage includes quartz, aragonite, calcite and high-Mg calcite expressed as mol %.

Simple

Identification info

Date (Publication)
2014-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/78815

Citation identifier
Digital Object Identifier/http://dx.doi.org/10.4225/25/54B86417B58A0

Cited responsible party
Role Organisation / Individual Name Details
Publisher

Geoscience Australia

 Canberra
Author

Radke, L.C.

 1
Author

Trafford, J.

 2
Author

Carey, M.

 3
Point of contact
Role Organisation / Individual Name Details
Custodian

EGD
Owner

Commonwealth of Australia (Geoscience Australia)
Custodian

Commonwealth of Australia (Geoscience Australia)

 Voice
Topic category
  • Oceans

Extent

N
S
E
W


Maintenance and update frequency
As needed
Keywords

  • Marine Data

Theme

  • marine survey

Theme

  • continental shelf

Theme

  • seabed

Theme

  • geochemistry

Theme

  • marine

Keywords

  • AU-WA

Australian and New Zealand Standard Research Classification (ANZSRC)

  • Marine Geoscience

Keywords

  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

 Voice
OnLine resource

File download

Download the file (xls)

Distribution format

  • xls

Resource lineage

Statement

Samples were collected using a Smith McIntyre grab. Dried, ground samples were scanned from 2o to 70o 2, at a speed of 2o per minute and a step size of 0.02o, using a SiemensTM D500/501 series X-ray diffractometer. Mineral identification software (EVATM) was used to identify the d-spacings of a series of peaks corresponding to individual minerals. The relative abundances of the different minerals in the XRD trace were determined using SiroQuantTM. To quantify mol%MgCO3, firstly the d-space for magnesium calcite was determined with reference to a ZnO standard, then mol%MgCO3 was determined using the calibration coefficient of Goldsmith et al. (1955).

Analytical errors are good to moderate: <5% for major elements and <10% for trace elements.


Goldsmith, J.R., Graf, D.L. and Joensuu, O.I., 1955. The occurrence of magnesian calcites in nature. Geochimica et Cosmochimica Acta, 7: 212-230.


Thanks to the crew of the RV Southern Surveyor for help with sample collection and Ashleigh Taylor and Tara Lidgard for lab support.

Hierarchy level
Dataset
Description

Unknown

Metadata constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/efe74af7-383d-12cb-e044-00144fdd4fa6

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
Role Organisation / Individual Name Details
Point of contact

Commonwealth of Australia (Geoscience Australia)

 Voice

Type of resource

Resource scope
Dataset
Name

dataset

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/78815

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/efe74af7-383d-12cb-e044-00144fdd4fa6

Date info (Revision)
2018-04-22T08:39:43
Date info (Creation)
2014-01-14T00:00:00

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

Spatial extent

N
S
E
W


Keywords

continental shelf geochemistry marine marine survey seabed

Provided by

Access to the portal

Associated resources

Not available