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Sylvania Dome

Entity ID: 464380 Compiled by: Stewart, A.J. Year: 2009 Status: Defined

Last Revised: 2015

Rank: province Type: tectonic Subtype: undefined Location: WA On-shore

Synonyms: NA Symbol: NA

Minimum age: Rhyacian, 2235 ± 54 Ma Age method: isotopic, Rb/Sr

Maximum age: Neoarchean, 2800 ± 240 Ma Age method: isotopic, Rb/Sr

Summary: 'Inlier' preferred by Geological Survey Western Australia because 'structural controls on the Sylvania outcrop are much more complex' than a simple dome, and because it is unconformably overlain by different groups in West, South, and East.

Attributes:
Area (square kilometres): 5600
State: WA
Resources: Chromium
Coobina deposit > 10,000 t Cr
Resources: Lead
One deposit < 10,000 t Pb
Resources: Copper
Two deposits < 10,000 t Cu; one with Zn and Ba also
Resources: Gold
Two deposits < 1 t Au
Country: AUS

Parent: Pilbara Craton

Child Provinces: No data

Relationships: None

Constituent units: Sylvania Dyke Swarm, metamorphosed mafic igneous rocks 74246, dolerite, metagabbro 74261, ultramafic rocks 74474

Events: No data

Mineral Deposits: Coobina

Key Reference: Tyler, I. 1991, The geology of the Sylvania Inlier and the Southeast Hamersley Basin, Geological Survey of Western Australia. Bulletin, 138, 108p Plates in pocket (see 42704) (Refid:64384)

Comments: 'Inlier' preferred by Geological Survey Western Australia because the structural controls on the Sylvania are more complex than a simple dome

Overview: Mostly granitic rock with discontinuous greenstone belts intruded by the granite. Greenstones are layered sequences of low- to medium-grade metavolcanic, mafic intrusive, and metasedimentary rocks. The largest greenstone belt, and the most complete stratigraphically, occurs within the Jimblebar greenstone belt. An ultramafic intrusion at Coobina intrudes greenstone and early granite, and hosts chromitite masses. Regarded as related to Pilbara Craton because it is basement to 2750 Ma-old rocks of Hamersley Basin, and therefore older than granite-greenstones of Yilgarn Craton. The structural controls on the Sylvania outcrop are complex and is unconformably overlain by the Middle Proterozoic Bresnahan Group to the west, and by the Middle to Late Proterozoic Bangemall Group to the south and east.

Images: No data

Other media: No data

Source Information:

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This report was generated on Friday, January 20, 2017 11:00:29 PM EST.