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Geochemical Systematics of High Arctic Large Igneous Province Continental Tholeiites from Canada-Evidence for Progressive Crustal Contamination in the Plumbing System
Geol Survey Canada, 490 Couronne, Quebec City, PQ G1K 9A9, Canada..
Univ Quebec Montreal, Dept Sci Terre & Atmosphere, 201 Av President Kennedy, Montreal, PQ H2X 3Y7, Canada..
Aarhus Univ, Ctr Earth Syst Petrol, Dept Geosci, Aarhus, Denmark..
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Naturresurser och hållbar utveckling.ORCID-id: 0000-0003-1891-3396
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2021 (engelsk)Inngår i: Journal of Petrology, ISSN 0022-3530, E-ISSN 1460-2415, Vol. 62, nr 9, artikkel-id egab041Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Cretaceous High Arctic large igneous province (HALIP) sub-alkaline magmatic rocks in Canada are mostly evolved (MgO 2-7 wt%), sparsely plagioclase + clinopyroxene +/- olivine-phyric tholeiitic basalts. There were two main HALIP continental flood basalt (CFB) eruption episodes: 135-120 Ma (Isachsen Fm.) and 105-90 Ma (Strand Fiord Fm.), both associated with cogenetic doleritic sills and dykes. Building on a large modern database, 16 HALIP tholeiite types are defined and grouped into genetic series using Ce vs Sm/Yb-NMORB distributions. Comparison with model melting curves implies that higher-Sm/Yb HALIP basalt types record low-degree melting of garnet-bearing mantle sources. More voluminous intermediate- and low-Sm/Yb HALIP basalt types separated from the mantle at shallower levels after further extensive melting in the spinel-peridotite field. Within a given Sm/Yb range, increases in incompatible elements such as Ce are coupled with progressive clockwise rotation of normalized incompatible trace element profiles. Trace element modeling implies this cannot be due to closed-system fractional crystallization but requires progressive and ubiquitous incorporation of a component resembling continental crust. The fractionation models imply that low-Sm/Yb HALIP basalts (similar to 7 wt% MgO) initially crystallized olivine gabbro assemblages, with lower-MgO basalts successively crystallizing gabbro and ilmenite-gabbro assemblages. In contrast, higher-Sm/Yb basalts fractionated more clinopyroxene and ilmenite, but extensive plagioclase fractionation is still required to explain developing negative Sr-Eu anomalies. Backfractionation models require about 40% addition of olivine to bring the most primitive HALIP basalts (similar to 7% MgO) into equilibrium with Fo(89) mantle. Inverse fractionation-assimilation modeling shrinks the CFB signature, making decontaminated model parental melts more similar to enriched mid-ocean ridge basalt. The progressive increase of the contamination signature within each HALIP tholeiitic differentiation series is not consistent with models involving derivation of HALIP basalts from a mantle source previously enriched by subduction. Strong interaction of basalt with Sverdrup Basin sedimentary rocks may cause localized over-enrichment in K-Rb-Th-U, but cannot explain strong Ba enrichment in the absence of concomitant K-Rb-Th-U enrichment. The localized Ba enrichment could reflect either a Ba-rich lithospheric mantle component that is strongly manifested in the coeval HALIP alkaline suites, or syn- to post-emplacement fluid-mediated transfer from Ba-rich host rocks.

sted, utgiver, år, opplag, sider
OXFORD UNIV PRESS Oxford University Press, 2021. Vol. 62, nr 9, artikkel-id egab041
Emneord [en]
basalt, contamination, continental LIP, HALIP, plumbing system
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-458479DOI: 10.1093/petrology/egab041ISI: 000708732900004OAI: oai:DiVA.org:uu-458479DiVA, id: diva2:1611438
Forskningsfinansiär
Swedish Research CouncilSwedish Polar Research Secretariat
Merknad

Correction in: JOURNAL OF PETROLOGY, Volume 63, Issue 3, Article Number egac019, DOI 10.1093/petrology/egac019 

Tilgjengelig fra: 2021-11-15 Laget: 2021-11-15 Sist oppdatert: 2024-01-15bibliografisk kontrollert

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