Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/26806
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- Title
- Subduction signature for quenched carbonatites from the deep lithosphere
- Related
- Geology, Vol. 30, Issue 8, p.743-746
- DOI
- 10.1130/0091-7613(2002)030<0743:SSFQCF>2.0.CO;2
- Publisher
- Geological Society of America
- Date
- 2002
- Author/Creator
- van Achterbergh, Esmé
- Author/Creator
- Griffin, Wlliam M
- Author/Creator
- Ryan, Chris G
- Author/Creator
- O'Reilly, Suzanne Y
- Author/Creator
- Pearson, Norman J
- Author/Creator
- Kivi, Kevin
- Author/Creator
- Doyle, Buddy J
- Description
- Quenched carbonate-silicate inclusions in lherzolitic clinopyroxene macrocrysts, derived from 200 km beneath the Slave craton in northern Canada, are interpreted as natural samples of mantle carbonatites. Oxygen, carbon, and strontium isotope data provide evidence for the involvement of subducted crustal material in the origin of these carbonatites, supporting suggestions that carbon recycling by subduction is an important prerequisite for carbonatite magmatism. The compositional range of the inclusions suggests that the parent melt was decreasing in silica content as it was trapped in the host crystal, a trend that is predicted experimentally. Isotopic disequilibrium between the carbonatitic inclusions and the host clinopyroxene indicates that they were trapped shortly before kimberlite eruption, suggesting a temporal link between the entrapment of the carbonatite in the host and the Paleocene eruption of the kimberlite.
- Description
- 4 page(s)
- Subject Keyword
- carbonatites
- Subject Keyword
- isotopes
- Subject Keyword
- subduction
- Subject Keyword
- Slave province
- Subject Keyword
- mantle melts
- Subject Keyword
- xenoliths
- Resource Type
- journal article
- Organisation
- Macquarie University. Dept. of Earth and Planetary Sciences
- Organisation
- Macquarie University. National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC)
- Identifier
- http://hdl.handle.net/1959.14/26806
- Identifier
- ISSN:0091-7613
- Identifier
- mq-rm-2002014614
- Language
- eng
- Reviewed
