Abstract

Long wave-length components of the gravity and magnetic fields, topography, and heat-flow data, are examined along a trans-continent profile close to 29°S. The profile crosses from the west Australian Archaean shield in the west to the New England Permian geosyncline in the east. The depth to the Moho, the mean crustal density, and temperatures at 40 km depth and at the base of the crust are derived from the profiles. Depths obtained from seismic refraction and reflection surveys near the profile are shown for comparison. The gravity anomalies show that departures from isostasy along the profile must be small, although in the eastern part of the Precambrian shield compensation must be either regional or deeper than the base of the crust. The Moho is probably at about 35-40 km depth over most of the profile. Average crustal density estimates range from 2.82 to 2.96 t/m^3. Temperatures at a given depth increase from west to east; the depth to the Curie temperature may be below the base of the crust under the west Australian craton, but within the crust in the eastern part of the profile. The magnetic profile shows long wave-length features of some hundreds of nanoteslas amplitude; some of these correlate with gravity anomalies, others show a reverse correlation. Anomalies are generally larger in the western part of the traverse. Some anomalies appear to be caused by permanently magnetised rocks. The crust beneath the Permian New England Geosyncline is similar to that beneath the Archaean shield in Western Australia in average crustal density, elevation, and crustal thickness.
Google map showing geographic bounding box with values North bound -27.0 East bound 158.0 West bound 110.0 South bound -31.0
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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1979-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81013 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81013/

Keywords

GA Publication
Journal
AUS
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-27.0
East bound
158.0
West bound
110.0
South bound
-31.0

Lineage

Unknown

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Source Description

Source data not available.

Metadata File Identifier

fae9173a-6fd2-71e4-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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