title: Spatial distribution of eclogite in the Slave cratonic mantle: The role of subduction
metadata.name: dc.contributor.author
metadata.value: Kopylova, Maya
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Beausoleil, Yvette
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Goncharov, Alexey
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Burgerss, Jennifer
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Strand, Pamela
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2016-05-12T17:11:33Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2016-05-12T17:11:33Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2016-02
metadata.lang: -
metadata.name: dc.identifier
metadata.value: doi:10.1016/j.tecto.2016.01.034
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Tectonophysics, Volumes 672–673, 16 March 2016, Pages 87–103
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/2266
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: We reconstructed the spatial distribution of eclogites in the cratonic mantle based on thermobarometry for ~ 240 xenoliths in 4 kimberlite pipes from different parts of the Slave craton (Canada). The accuracy of depth estimates is ensured by the use of a recently calibrated thermometer, projection of temperatures onto well-constrained local peridotitic geotherms, petrological screening for unrealistic temperature estimates, and internal consistency of all data. The depth estimates are based on new data on mineral chemistry and petrography of 148 eclogite xenoliths from the Jericho and Muskox kimberlites of the northern Slave craton and previously reported analyses of 95 eclogites from Diavik and Ekati kimberlites (Central Slave). The majority of Northern Slave eclogites of the crustal, subduction origin occurs at 110–170 km, shallower than in the majority of the Central Slave crustal eclogites (120–210 km). The identical geochronological history of these eclogite populations and the absence of steep suture boundaries between the central and northern Slave craton suggest the lateral continuity of the mantle layer relatively rich in eclogites. We explain the distribution of eclogites by partial preservation of an imbricated and plastically dispersed oceanic slab formed by easterly dipping Proterozoic subduction. The depths of eclogite localization do not correlate with geophysically mapped discontinuities. The base of the depleted lithosphere of the Slave craton constrained by thermobarometry of peridotite xenoliths coincides with the base of the thickened lithospheric slab, which supports contribution of the recycled oceanic lithosphere to formation of the cratonic root. Its architecture may have been protected by circum-cratonic subduction and shielding of the shallow Archean lithosphere from the destructive asthenospheric metasomatism.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: Tectonophysics
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Spatial distribution of eclogite in the Slave cratonic mantle: The role of subduction
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: TECTO-S-15-00241Revised.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/2266/1/TECTO-S-15-00241Revised.pdf
resources.format: Adobe PDF
resources.size: 8,34 MB