Precambrian metamorphism, fluid flow, and metallogeny of Australia

Current models for metamorphic fluid flow provide a framework for understanding the setting and genesis of Australian Precambrian ore deposits thought to have formed during metamorphism. Ideal conditions for formation of large metamorphogenic ores are a) an initial phase of metals dissolution by penetrative flow of devolatilisation, surface or igneous fluids along pathways of constant or increasing temperature, because channelised fluid flow will not normally provide the required metal volumes or transport continuity to subsequently form large ore deposits, and b) a subsequent phase of channelised fluid flow, particularly during retrogression or fluid mixing where temperature or fluid chemical changes combine with rapid fluctuations in fluid pressure accompanying dilatancy pumping. Protracted thermal histories and the identification of multiple hydrothermal events in major mineralised blocks (Yilgarn, Mt Isa, Broken Hill) provide some weight for multi-stage ore enesis models, particularly for giant ore deposits. Despite continuing uncertainty about the tectonic setting of many major mineral provinces, intra-plate orogeny, particularly in the Palaeoproterozoic and Mesoproterozoic, appears to provide the necessary conditions for development of rich mineral provinces. Such orogenies have the right combinations of temperature- pressure history, fluid evolution and magma generation to provide optimum conditions for ore genesis. A common feature to intracratonic belts of this age is an early phase of crustal extension following or synchronous with mafic magma underplating, and this early underplating may be the ultimate reason for primary metals enrichment. However, the subsequent path history of metals culminating in ore deposition is still controversial and poorly understood for most Australia Precambrian terrains.

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Date (Publication)
1998-01-01T00:00:00
Citation identifier
Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81521

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Role Organisation / Individual Name Details
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Australian Geological Survey Organisation

 Canberra
Author

Oliver, N.H.

 1
Author

Rubenach, M.J.

 2
Author

Valenta, R.K.

 3
Name

AGSO Journal of Australian Geology and Geophysics

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17:4:31-53

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Commonwealth of Australia (Geoscience Australia)
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Commonwealth of Australia (Geoscience Australia)

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Unknown

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Product data repository: Various Formats

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Data Store directory containing the digital product files

Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes

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Australian and New Zealand Standard Research Classification (ANZSRC)

  • Earth Sciences

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  • Published_External

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Creative Commons Attribution 4.0 International Licence

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CC-BY

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4.0

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http://creativecommons.org/licenses/

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License

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Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
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https://www.protectivesecurity.gov.au/Pages/default.aspx

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Unclassified
Language
English
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UTF8

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Commonwealth of Australia (Geoscience Australia)

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OnLine resource

Journal article (pdf)

Journal article (pdf)

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  • pdf

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Non geographic dataset
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GA Publication

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Title

Australian Government Security ClassificationSystem

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

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

Classification
Unclassified

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Metadata identifier
urn:uuid/fae9173a-71ce-71e4-e044-00144fdd4fa6

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GeoNetwork UUID

Language
English
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UTF8
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Commonwealth of Australia (Geoscience Australia)

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Document
Name

AGSO BMR Journal

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Geoscience Australia - short identifier for metadata record with

uuid

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eCatId/81521

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https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/fae9173a-71ce-71e4-e044-00144fdd4fa6

Date info (Revision)
2018-04-20T06:06:58
Date info (Creation)
2014-06-03T00:00:00

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

 
 

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