Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/31575
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- Title
- Lithospheric domains and controls on kimberlite emplacement, Slave Province, Canada : evidence from elastic thickness and upper mantle composition
- Related
- Geochemistry, geophysics, geosystems (G³), Vol. 6, Issue 10, p.1-16
- DOI
- 10.1029/2005GC000978
- Publisher
- American Geophysical Union
- Date
- 2005
- Author/Creator
- Poudjom Djomani, Yvette H
- Author/Creator
- Griffin, William L
- Author/Creator
- O'Reilly, Suzanne Y
- Author/Creator
- Doyle, Buddy J
- Description
- We have mapped the deep structure of the Slave craton by combining analysis the effective elastic thickness (Te) with data on mantle samples from numerous kimberlites. Three-dimensional mapping of the subcontinental lithospheric mantle (SCLM), using mantle-derived xenoliths and xenocrysts in kimberlites, has shown that much of the craton is underlain by a strongly layered SCLM; a highly depleted upper layer (low in basaltic components Ca, Al, Fe) is separated from a relatively fertile lower layer by a sharp boundary. This boundary lies at 140–150 km depth in the Lac de Gras area and shallows to ≤100 km in the northern and southern parts of the Craton. Weak lithosphere (Te < 25 km) on the northern edge of the craton may reflect the intrusion of the Mackenzie Plume (circa 1270 Ma). The strongest lithosphere (Te > 56 km), in the younger eastern part of the craton, is separated from the older western part by a zone of steep Te gradient parallel to the major locus of kimberlite intrusion, which may map the deep extension of the boundary between the two domains. Another strong Te gradient across the Kilohigok Basin accompanies a marked compositional change in the upper layer of the lithospheric mantle; the Basin probably marks a major translithospheric fault. Correlations between Te and mantle composition suggest that Te is strongly influenced by the rheology of the upper mantle.
- Description
- 16 page(s)
- Subject Keyword
- Slave craton mantle
- Subject Keyword
- elastic thickness
- Subject Keyword
- deep lithosphere structure
- Subject Keyword
- Canada kimberlite emplacement
- Subject Keyword
- lithospheric mantle composition
- Resource Type
- journal article
- Organisation
- Macquarie University. National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC)
- Identifier
- http://hdl.handle.net/1959.14/31575
- Identifier
- ISSN:1525-2027
- Identifier
- mq-rm-2005002243
- Language
- eng
- Full Text
- Reviewed
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