Abstract

This address was presented at the annual Prospectors and Developers Association of Canada International Convention, Trade Show and Investors Exchange (PDAC), 4-6 March 2005 in Toronto, Canada. Geoscience Australia's use of deep crustal seismic reflection imaging techniques to determine the crustal architecture near several world-class mineral deposits (Kalgoorlie, Broken Hill, Mount Isa, McArthur River, Olympic Dam) is challenging current understanding of Australia's geology, ore deposit models and prospectivity. The focus has been identifying the main crustal-scale fluid migration pathways and depositional environment (traps). Seismic reflection images suggest that the crust of the Eastern Goldfields (Yilgarn Craton) formed in an accretionary orogen with gold associated with higher-order splays along corridors linked to crustal-penetrating faults. The Broken Hill survey showed the major structures dip SE (not NW) leading to a new 3D geological model for the supergiant Ag-Pb-Zn Broken Hill deposit. The Mt Isa seismic survey suggests that mineralised fluid circulation in the Western Succession was controlled by the Adelheid Fault not the Mt Isa Fault, and revealed Cu-Au deposits associated with the previously unmapped Marimo Fault in the Eastern Succession. The super giant Olympic Dam deposit (3810 Mt @ 1.1% Cu, 0.4 kg/t U308, 0.5 g/t Au) is associated with mantle-penetrating structures at a major crustal boundary. The giant McArthur River Ag-Pb-Zn deposit lies at the edge of a foreland fold-and-thrust belt rather than a rift setting. The newly-defined crustal architecture for many of these deposits requires a re-examination of current geological and ore deposit models. We discuss the exploration implications of these new results and the use of seismic to image alteration haloes around ore bodies.
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)

2005

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-db69-7506-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

2008-12-04

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