Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island
While the mantle roots directly beneath Archean cratons have been relatively well studied because of their economic importance, much less is known about the genesis, age, composition and thickness of the mantle lithosphere beneath the regions that surround the cratons. Despite this knowledge gap, it...
Published in: | Geochimica et Cosmochimica Acta |
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Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier
2018
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Online Access: | http://eprints.gla.ac.uk/166814/ http://eprints.gla.ac.uk/166814/14/166814.pdf http://eprints.gla.ac.uk/166814/7/166814Suppl.xlsx http://eprints.gla.ac.uk/166814/8/166814Suppl.pdf |
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Open Polar |
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University of Glasgow: Enlighten - Publications |
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ftuglasgow |
language |
English |
description |
While the mantle roots directly beneath Archean cratons have been relatively well studied because of their economic importance, much less is known about the genesis, age, composition and thickness of the mantle lithosphere beneath the regions that surround the cratons. Despite this knowledge gap, it is fundamentally important to establish the nature of relationships between this circum-cratonic mantle and that beneath the cratons, including the diamond potential of circum-cratonic regions. Here we present mineral and bulk elemental and isotopic compositions for kimberlite-borne mantle xenoliths from the Parry Peninsula and Central Victoria Island, Arctic Canada. These xenoliths provide key windows into the lithospheric mantle underpinning regions to the North and Northwest of the Archean Slave craton, where the presence of cratonic material has been proposed. The mantle xenolith data are supplemented by mineral concentrate data obtained during diamond exploration. The mineral and whole rock chemistry of peridotites from both localities is indistinguishable from that of typical cratonic mantle lithosphere. The cool mantle paleogeotherms defined by mineral thermobarometry reveal that the lithospheric mantle beneath the Parry Peninsula and Central Victoria Island terranes extended well into the diamond stability field at the time of kimberlite eruption, and this is consistent with the recovery of diamonds from both kimberlite fields. Bulk xenolith Se and Te contents, and highly siderophile element (including Os, Ir, Pt, Pd and Re) abundance systematics, plus corresponding depletion ages derived from Re-Os isotope data suggest that the mantle beneath these parts of Arctic Canada formed in the Paleoproterozoic Era, at ∼2 Ga, rather than in the Archean. The presence of a diamondiferous Paleoproterozoic mantle root is part of the growing body of global evidence for diamond generation in mantle roots that stabilized well after the Archean. In the context of regional tectonics, we interpret the highly depleted mantle compositions beneath both studied regions as formed by mantle melting associated with hydrous metasomatism in the major Paleoproterozoic Wopmay-Great Bear-Hottah arc systems. These ∼2 Ga arc systems were subsequently accreted along the margin of the Slave craton to form a craton-like thick lithosphere with diamond potential thereby demonstrating the importance of subduction accretion in building up Earth’s long-lived continental terranes. |
format |
Article in Journal/Newspaper |
author |
Liu, Jingao Brin, Laura E. Pearson, D. Graham Bretschneider, Lisa Luguet, Ambre van Acken, David Kjarsgaard, Bruce Riches, Amy Mišković, Aleksandar |
spellingShingle |
Liu, Jingao Brin, Laura E. Pearson, D. Graham Bretschneider, Lisa Luguet, Ambre van Acken, David Kjarsgaard, Bruce Riches, Amy Mišković, Aleksandar Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island |
author_facet |
Liu, Jingao Brin, Laura E. Pearson, D. Graham Bretschneider, Lisa Luguet, Ambre van Acken, David Kjarsgaard, Bruce Riches, Amy Mišković, Aleksandar |
author_sort |
Liu, Jingao |
title |
Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island |
title_short |
Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island |
title_full |
Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island |
title_fullStr |
Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island |
title_full_unstemmed |
Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island |
title_sort |
diamondiferous paleoproterozoic mantle roots beneath arctic canada: a study of mantle xenoliths from parry peninsula and central victoria island |
publisher |
Elsevier |
publishDate |
2018 |
url |
http://eprints.gla.ac.uk/166814/ http://eprints.gla.ac.uk/166814/14/166814.pdf http://eprints.gla.ac.uk/166814/7/166814Suppl.xlsx http://eprints.gla.ac.uk/166814/8/166814Suppl.pdf |
long_lat |
ENVELOPE(-62.417,-62.417,-64.283,-64.283) ENVELOPE(-30.000,-30.000,-79.500,-79.500) |
geographic |
Arctic Canada Parry Parry Peninsula |
geographic_facet |
Arctic Canada Parry Parry Peninsula |
genre |
Arctic Arctic Parry Peninsula Victoria Island victoria island |
genre_facet |
Arctic Arctic Parry Peninsula Victoria Island victoria island |
op_relation |
http://eprints.gla.ac.uk/166814/14/166814.pdf http://eprints.gla.ac.uk/166814/7/166814Suppl.xlsx http://eprints.gla.ac.uk/166814/8/166814Suppl.pdf Liu, J., Brin, L. E., Pearson, D. G., Bretschneider, L., Luguet, A., van Acken, D., Kjarsgaard, B., Riches, A. <http://eprints.gla.ac.uk/view/author/47144.html> and Mišković, A. (2018) Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island. Geochimica et Cosmochimica Acta <http://eprints.gla.ac.uk/view/journal_volume/Geochimica_et_Cosmochimica_Acta.html>, 239, pp. 284-311. (doi:10.1016/j.gca.2018.08.010 <http://dx.doi.org/10.1016/j.gca.2018.08.010>) |
op_rights |
cc_by_nc_nd_4 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.gca.2018.08.010 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
239 |
container_start_page |
284 |
op_container_end_page |
311 |
_version_ |
1766301503565332480 |
spelling |
ftuglasgow:oai:eprints.gla.ac.uk:166814 2023-05-15T14:27:40+02:00 Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island Liu, Jingao Brin, Laura E. Pearson, D. Graham Bretschneider, Lisa Luguet, Ambre van Acken, David Kjarsgaard, Bruce Riches, Amy Mišković, Aleksandar 2018-10-15 text other http://eprints.gla.ac.uk/166814/ http://eprints.gla.ac.uk/166814/14/166814.pdf http://eprints.gla.ac.uk/166814/7/166814Suppl.xlsx http://eprints.gla.ac.uk/166814/8/166814Suppl.pdf en eng Elsevier http://eprints.gla.ac.uk/166814/14/166814.pdf http://eprints.gla.ac.uk/166814/7/166814Suppl.xlsx http://eprints.gla.ac.uk/166814/8/166814Suppl.pdf Liu, J., Brin, L. E., Pearson, D. G., Bretschneider, L., Luguet, A., van Acken, D., Kjarsgaard, B., Riches, A. <http://eprints.gla.ac.uk/view/author/47144.html> and Mišković, A. (2018) Diamondiferous Paleoproterozoic mantle roots beneath Arctic Canada: a study of mantle xenoliths from Parry Peninsula and Central Victoria Island. Geochimica et Cosmochimica Acta <http://eprints.gla.ac.uk/view/journal_volume/Geochimica_et_Cosmochimica_Acta.html>, 239, pp. 284-311. (doi:10.1016/j.gca.2018.08.010 <http://dx.doi.org/10.1016/j.gca.2018.08.010>) cc_by_nc_nd_4 CC-BY-NC-ND Articles PeerReviewed 2018 ftuglasgow https://doi.org/10.1016/j.gca.2018.08.010 2020-01-10T01:42:51Z While the mantle roots directly beneath Archean cratons have been relatively well studied because of their economic importance, much less is known about the genesis, age, composition and thickness of the mantle lithosphere beneath the regions that surround the cratons. Despite this knowledge gap, it is fundamentally important to establish the nature of relationships between this circum-cratonic mantle and that beneath the cratons, including the diamond potential of circum-cratonic regions. Here we present mineral and bulk elemental and isotopic compositions for kimberlite-borne mantle xenoliths from the Parry Peninsula and Central Victoria Island, Arctic Canada. These xenoliths provide key windows into the lithospheric mantle underpinning regions to the North and Northwest of the Archean Slave craton, where the presence of cratonic material has been proposed. The mantle xenolith data are supplemented by mineral concentrate data obtained during diamond exploration. The mineral and whole rock chemistry of peridotites from both localities is indistinguishable from that of typical cratonic mantle lithosphere. The cool mantle paleogeotherms defined by mineral thermobarometry reveal that the lithospheric mantle beneath the Parry Peninsula and Central Victoria Island terranes extended well into the diamond stability field at the time of kimberlite eruption, and this is consistent with the recovery of diamonds from both kimberlite fields. Bulk xenolith Se and Te contents, and highly siderophile element (including Os, Ir, Pt, Pd and Re) abundance systematics, plus corresponding depletion ages derived from Re-Os isotope data suggest that the mantle beneath these parts of Arctic Canada formed in the Paleoproterozoic Era, at ∼2 Ga, rather than in the Archean. The presence of a diamondiferous Paleoproterozoic mantle root is part of the growing body of global evidence for diamond generation in mantle roots that stabilized well after the Archean. In the context of regional tectonics, we interpret the highly depleted mantle compositions beneath both studied regions as formed by mantle melting associated with hydrous metasomatism in the major Paleoproterozoic Wopmay-Great Bear-Hottah arc systems. These ∼2 Ga arc systems were subsequently accreted along the margin of the Slave craton to form a craton-like thick lithosphere with diamond potential thereby demonstrating the importance of subduction accretion in building up Earth’s long-lived continental terranes. Article in Journal/Newspaper Arctic Arctic Parry Peninsula Victoria Island victoria island University of Glasgow: Enlighten - Publications Arctic Canada Parry ENVELOPE(-62.417,-62.417,-64.283,-64.283) Parry Peninsula ENVELOPE(-30.000,-30.000,-79.500,-79.500) Geochimica et Cosmochimica Acta 239 284 311 |