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Sm-Nd and Lu-Hf isotope and trace-element systematics of Mesoarchaean amphibolites, inner Ameralik fjord, southern West Greenland

Published online by Cambridge University Press:  02 January 2018

Kristoffer Szilas ,
J. Elis Hoffmann ,
Christina Hansmeier ,
Julie A. Hollis ,
Carsten Münker ,
Sebastian Viehmann  and
Haino U. Kasper
Kristoffer Szilas*
Affiliation:
Stanford University, Department of Geological and Environmental Sciences, 450 Serra Mall, CA 94305, USA
J. Elis Hoffmann
Affiliation:
Steinmann Institut für Geologie, Mineralogie und Paläontologie, Abt. Endogene Prozesse, Rheinische Wilhelms-Universität Bonn, Poppelsdorfer Schloss, 53115 Bonn, Germany Universität zu Köln, Geologisch-Mineralogisches Institut, Albertus-Magnus-Platz, 50674 Köln, Germany Institut fü r Geologische Wissenschaften, Abt. Geochemie, Freie Universität Berlin, Malteserstrasse 74-100, 12249 Berlin, Germany
Christina Hansmeier
Affiliation:
Steinmann Institut für Geologie, Mineralogie und Paläontologie, Abt. Endogene Prozesse, Rheinische Wilhelms-Universität Bonn, Poppelsdorfer Schloss, 53115 Bonn, Germany
Julie A. Hollis
Affiliation:
Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 Copenhagen K, Denmark Geological Survey of Western Australia, Mineral House, 100 Plain St, East Perth, WA 6000, Australia
Carsten Münker
Affiliation:
Universität zu Köln, Geologisch-Mineralogisches Institut, Albertus-Magnus-Platz, 50674 Köln, Germany
Sebastian Viehmann
Affiliation:
Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany
Haino U. Kasper
Affiliation:
Universität zu Köln, Geologisch-Mineralogisches Institut, Albertus-Magnus-Platz, 50674 Köln, Germany
*
*E-mail: [email protected]
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Abstract

Fragmented supracrustal rocks are typical components of Archaean high-grade gneiss terranes, such as those in the North Atlantic Craton. Here we present the first major, trace element and Nd-Hf isotope data for amphibolites collected in the yet poorly studied southern inner Ameralik fjord region of southern West Greenland. In addition, new U-Pb zircon ages were obtained from the surrounding TTG gneisses.

Based on their trace-element patterns, two different groups of amphibolites can be distinguished. Following screening for post-magmatic alteration and outlying ε values, a reduced sample set defines a 147Sm/143Nd regression age of 3038 Ma ±310 Ma (MSWD = 9.2) and a 176Lu/176Hf regression age of 2867 ±160 Ma (MSWD = 5.5). Initial εNd2970Ma values of the least-altered amphibolites range from 0.0 to +5.7 and initial εHf2970Ma range from +0.7 to +10.4, indicating significant isotopic heterogeneity of their mantle sources with involvement of depleted domains as well as crustal sources.

Surprisingly, the amphibolites which are apparently most evolved and incompatible element-rich have the most depleted Hf-isotope compositions. This apparent paradox may be explained by the sampling of a local mantle source region with ancient previous melt depletion, which was re-enriched by a fluid component during subduction zone volcanism or alternatively by preferential melting of an ancient pyroxenite component in the mantle source of the enriched rocks.

Keywords

Nuuk regionArchaeangreenstone beltsupracrustal rocksHf isotope data
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 4 , August 2015 , pp. 857 - 876
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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Footnotes

*

This paper is published as part of a special set in Mineralogical Magazine, Volume 79(4), 2015, arising out of the March 2014 NAC Conference on the North Atlantic Craton.

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