Coupling, decoupling and metasomatism: Evolution of crust–mantle relationships beneath NW Spitsbergen

Griffin, William L.; Nikolić, Nada Č.; O’Reilly, Suzanne Y.; Pearson, Norman J.

doi:10.1016/j.lithos.2012.03.003

Cited by 33 publications

(26 citation statements)

References 56 publications

(91 reference statements)

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“…Xenoliths from Spitsbergen have been extensively studied previously, and the SCLM in this locality has a well-defined metasomatic history (Amundsen et al, 1987;Griffin et al, 2012;Ionov et al, 2002a;Ionov et al, 2002b).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…In situ measurements of Os isotopes in xenolith-hosted sulfides have shown that there is a marked contrast in the extent and timing of metasomatism on either side of the BB fault Griffin et al, 2012). The xenoliths from Sigurdfjell and Halvdanpiggen, on the eastern side, consistently give younger ages than do the sulfides in xenoliths from Sverrefjell .…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…This study focuses on 31 mantle-derived peridotites sampled within the spinel stability field, at depths of 25 -65 km (Amundsen et al, 1987;Griffin et al, 2012 Amphibole veins (5 -15 mm thick) cross-cut several samples (SI709 and H1-1). These patches and veins probably represent crystallisation of metasomatic fluids and melts (Amundsen et al, 1987;Griffin et al, 2012).…”

Section: Sample Descriptionsmentioning

confidence: 99%

“…These patches and veins probably represent crystallisation of metasomatic fluids and melts (Amundsen et al, 1987;Griffin et al, 2012).…”

Section: Sample Descriptionsmentioning

confidence: 99%

“…In situ Re-Os isotopic analysis has previously been performed on the samples discussed here by Griffin et al (2012). These data have been re-evaluated here in light of the metasomatic classification defined by the clinopyroxene compositions ( Figure 13).…”

Section: Timing Of Metasomatismmentioning

confidence: 99%

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Sulfide metasomatism and the mobility of gold in the lithospheric mantle

et al. 2015

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Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Regional Geological Settingmentioning

confidence: 99%

Section: Sample Descriptionsmentioning

confidence: 99%

“…These patches and veins probably represent crystallisation of metasomatic fluids and melts (Amundsen et al, 1987;Griffin et al, 2012).…”

Section: Sample Descriptionsmentioning

confidence: 99%

Section: Timing Of Metasomatismmentioning

confidence: 99%

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Sulfide metasomatism and the mobility of gold in the lithospheric mantle

et al. 2015

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Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism

Scott

Waight²,

Meer³

et al. 2014

Geochem. Geophys. Geosyst.

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There has been long debate on the asthenospheric versus lithospheric source for numerous intraplate basalts with ocean island basalt (OIB) and high time-integrated U/Pb (HIMU)-like source signatures that have erupted through the Zealandia continental crust. Analysis of 157 spinel facies peridotitic mantle xenoliths from 25 localities across Zealandia permits the first comprehensive regional description of the subcontinental lithospheric mantle (SCLM) and insights into whether it could be a source to the intraplate basalts. Contrary to previous assumptions, the Oligocene-Miocene Zealandia SCLM is highly heterogeneous. It is composed of a refractory craton-like domain (West Otago) adjacent to several moderately fertile domains (East Otago, North Otago, Auckland Islands). Each domain has an early history decoupled from the overlying Carboniferous and younger continental crust, and each domain has undergone varying degrees of depletion followed by enrichment. Clinopyroxene grains reveal trace element characteristics (low Ti/Eu, high Th/U) consistent with enrichment through reaction with carbonatite. This metasomatic overprint has a composition that closely matches HIMU in Sr, Pb 6 Nd isotopes. However, clinopyroxene Hf isotopes are in part highly radiogenic and decoupled from the other isotope systems, and also mostly more radiogenic than the intraplate basalts. If the studied spinel facies xenoliths are representative of the thin Zealandia SCLM, the melting of garnet facies lithosphere could only be the intraplate basalt source if it had a less radiogenic Hf-Nd isotope composition than the investigated spinel facies, or was mixed with asthenosphere-derived melts containing less radiogenic Hf.

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Cratonic Lithosphere Discontinuities

Aulbach

2018

Lithospheric Discontinuities

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Coupling, decoupling and metasomatism: Evolution of crust–mantle relationships beneath NW Spitsbergen

Cited by 33 publications

References 56 publications

Sulfide metasomatism and the mobility of gold in the lithospheric mantle

Sulfide metasomatism and the mobility of gold in the lithospheric mantle

Metasomatized ancient lithospheric mantle beneath the young Zealandia microcontinent and its role in HIMU-like intraplate magmatism

Cratonic Lithosphere Discontinuities

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