Authors / CoAuthors
Smithies, R.H. | Champion, D.C. | Cassidy, K.F.
Abstract
Subduction of oceanic crust at an unusually low angle (flat-subduction) has been proposed as a general model for the growth of continental crust older than about 2.5 Ga. At modern zones of flat subduction, magmatic additions to new crust come from partial melting of both the subducting oceanic crust (slab) and the thin wedge of mantle above the slab. Evidence for both a slab and wedge source is commonly preserved in some, but not all, late Archaean (3.0-2.5 Ga) terrains, but we find little evidence that a mantle wedge contributed to early Archaean (>3.0 Ga) crustal growth. In contrast to most modern terrains and some late-Archaean terrains, early Archaean continental crust evolved through direct melting of thick mafic crust.
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nonGeographicDataset
eCat Id
39815
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Keywords
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- External PublicationArticle
- ( Theme )
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- geochemistry
- ( Theme )
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- plate tectonics
- ( Theme )
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- petrology
- ( Theme )
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- geology
- 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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