Authors / CoAuthors
Smithies, R.H. | Champion, D.C.
Abstract
The Wallareenya extensional jog developed between c. 2955 and 2940 Ma at a releasing bend in the northeast-trending Tabba Tabba Shear Zone, in the Archaean Pilbara Craton of northwestern Australia. The extensional jog, or pull-apart, formed during transtensional movement along the shear zone, and was simultaneously filled by a sequence of magmas that range in composition from gabbro to monzogranite. Magmas were emplaced through fractures which conform to Riedal R1 and R2 and P fracture directions and that segment the area into diamond-shaped blocks. Some of these conduits were utilised by up to five magma generations. Space for emplacement was created primarily through active extension within the evolving jog, and the emplacement age of the magmas decreases systematically westwards, tracking a paralleled migration in the main focus of extension. Away from fractures and magma conduits, horizontal sheeting shows that the magmas spread out laterally at suitable horizons such as the contact with overlying metasedimentary country rocks.
Product Type
nonGeographicDataset
eCat Id
36675
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Custodian
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- External PublicationArticle
- ( Theme )
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- geology
- ( Theme )
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- structural geology
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- AU-WA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2002-01-01T00:00:00
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unknown
Topic Category
geoscientificInformation
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Unknown
Parent Information
Extents
[-22.0, -20.0, 117.0, 119.0]
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