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GEOREF RECORD

Origin of the supergiant Olympic Dam Cu-U-Au-Ag deposit, South Australia; was a sedimentary basin involved?

Jocelyn McPhie, Vadim S. Kamenetsky, Isabelle Chambefort, Kathy Ehrig and Nicholas Green
Origin of the supergiant Olympic Dam Cu-U-Au-Ag deposit, South Australia; was a sedimentary basin involved?
Geology (Boulder) (August 2011) 39 (8): 795-798

Abstract

The supergiant Olympic Dam Cu-U-Au-Ag ore deposit of South Australia occurs in a tectonic-hydrothermal breccia complex that is surrounded by Mesoproterozoic granite. The breccia is composed mainly of granite clasts and minor amounts of Mesoproterozoic volcanic clasts. Very thick (>350 m) sections of bedded sedimentary facies that occur in the breccia complex include laminated to very thin planar mudstone beds, thin to medium internally graded sandstone beds, and thick conglomerate beds. The bedded sedimentary facies extend continuously across a 1.5 kmX0.9 km area and are not limited to small separate maar craters, as previously thought. Detrital chromite and volcanic quartz in the bedded sedimentary facies cannot be matched with local sources, and imply that the provenance extended beyond the area of Olympic Dam. The lateral continuity, provenance characteristics, great thickness, below-wave-base lithofacies, and intracontinental setting suggest that the bedded sedimentary facies are remnants of a sedimentary basin that was present at Olympic Dam prior to formation of the breccia complex. We conclude that the Olympic Dam hydrothermal system operated beneath and partly within an active sedimentary basin, was not confined to maar craters, and did not vent. This new view of the setting raises the possibility that sedimentary processes were involved in ore genesis.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 39
Serial Issue: 8
Title: Origin of the supergiant Olympic Dam Cu-U-Au-Ag deposit, South Australia; was a sedimentary basin involved?
Affiliation: ARC Centre of Excellence in Ore Deposits, Hobart, Tasmania, Australia
Pages: 795-798
Published: 201108
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 18
Accession Number: 2011-069078
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
S30°30'00" - S30°00'00", E136°00'00" - E137°00'00"
Secondary Affiliation: BHP-Billiton, AUS, Australia
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201138
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