Abstract

Paper presented at the World Diamond Conference held in Perth, 20-21 November, 2006. The paper gives an overview of current diamond exploration and discovery in Australia and reviews the state of knowledge of the geological setting and controls on known diamondiferous intrusions in Australia as an important indicator of Australia's diamond potential. Reduced levels of spending in recent years has been associated with a contraction of exploration largely to brownfields regions. Exceptions are the discovery of the diamondiferous Blacktop kimberlite in the West Pilbara region and, to a lesser extent, new kimberlites discovered in the eastern Gawler Craton. Most Australian kimberlites and lamproites, like those elsewhere, show evidence of strong structural controls. These features are commonly evident in continental scale geophysical datasets. Many of the diamondiferous intrusions lie at major boundaries/discontinuities evident in seismic S-wave tomographic models and at discontinuities evident in multi-scale analysis of horizontal gradients of continental magnetic anomaly and gravity datasets (Jaques and Milligan, 2004: Lithos 77, 783-802). These relationships are predicted by modelling with numerical mantle convection code which indicates that abrupt changes in lithospheric thickness focus lithospheric stress gradients affecting melt migration and accumulation thereby making the mantle beneath the margins of stable cratons favourable sites for kimberlite generation (O'Neill, Moresi and Jaques, Tectonophysics 404, 217-236). Diamond potential is intimately linked to craton evolution. Eclogitic diamond suites appear to be linked to subduction events at craton margins. Continental-scale geophysics can help define fertile source regions (mantle roots) and identify favourable tectonic zones/corridors. Improved targeting is required to better identify greenfields provinces which have the potential to host new diamond pipes. Such targeting would be enhanced by improved seismic tomographic models of the Australian lithosphere and through a better understanding of geodynamic evolution of the Australian continent.
Google map showing geographic bounding box with values North bound -9.0 East bound 156.0 West bound 110.0 South bound -44.0
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays

Product Type/Sub Type

dataset - PowerPoint

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2006

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

PowerPoint
geochemistry
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-9.0
East bound
156.0
West bound
110.0
South bound
-44.0

Lineage

Unknown

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

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

Metadata File Identifier

a05f7892-f6e8-7506-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 Date Stamp

2008-12-03

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays