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The Mesoarchean Amikoq Layered Complex of SW Greenland: Part 2. Geochemical evidence for high-Mg noritic plutonism through crustal assimilation

Published online by Cambridge University Press:  20 May 2021

Emil Aarestrup ,
Iain McDonald Open the ORCID record for Iain McDonald [Opens in a new window] ,
Paul E.B. Armitage ,
Allen P. Nutman ,
Ole Christiansen  and
Kristoffer Szilas Open the ORCID record for Kristoffer Szilas [Opens in a new window]
Emil Aarestrup
Affiliation:
Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1165 København K, Denmark
Iain McDonald
Affiliation:
School of Earth & Environmental Sciences, Cardiff University, Main Building, Park Place, CardiffCF10 3AT, United Kingdom
Paul E.B. Armitage
Affiliation:
Mkango Resources Ltd, 550 Burrard Street, Suite 2900, VancouverBC V6C0A3, Canada
Allen P. Nutman
Affiliation:
School of Earth, Atmospheric and Life Sciences, University of Wollongong, 2522, NSW, Australia
Ole Christiansen
Affiliation:
Kommune Kujalleq, Anders Olsensvej B 500, 3920 Qaqortoq, Greenland
Kristoffer Szilas*
Affiliation:
Department of Geosciences and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1165 København K, Denmark
*
*Author for correspondence: Kristoffer Szilas, Email: [email protected]
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Abstract

Whole-rock major- and trace-element data are presented on a sample collection from the >3 Ga Amikoq Layered Complex (ALC), and hosting amphibolites within the Mesoarchean Akia terrane, SW Greenland. The lithologies range from leuconorite to melanorite/feldspathic orthopyroxenite, orthopyroxenite to harzburgite through to dunite, and tholeiitic basaltic–picritic mafic host rocks. The Amikoq Layered Complex samples are primitive (Mg#: 65–89) with elevated Ni and Cr contents. However, the absence of troctolitic lithologies and the presence of two orthopyroxene compositional trends, suggests that the successions might not be comagmatic. On the basis of trace-element cumulate models, relatively low Ni contents and minor negative Sr-Eu anomalies in some high-Ti ultramafic rocks, it is not possible to exclude a petrogenesis related to a melt similar to that of the mafic host-rocks. Ultramafic samples with U-shaped trace-element distribution patterns are petrogenetically related to the noritic sequences, either through cumulus mineral accumulation or melt-rock reactions. Assimilation-fractional-crystallisation modelling of melanorites nevertheless require the parental melt to have been contaminated/mixed with a component of island-arc-like tholeiite affinity. A boninite-like parental melt might have been derived from the subcontinental lithospheric mantle of the Akia terrane, or alternatively via assimilation of an ultramafic parental melt with island-arc-like tholeiite. Given the complex geological evolution and high-grade metamorphic overprint of the Amikoq Layered Complex, we are unable to differentiate between the two models.

Keywords

Amikoq Layered ComplexArcheanboninite-likeFiskefjord regionhigh-Mg magma
Type
Article
Information
Mineralogical Magazine , Volume 85 , Issue 5 , October 2021 , pp. 673 - 697
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Craig Storey

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