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Geosciences 2018, 8(9), 319; https://doi.org/10.3390/geosciences8090319

The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland

1
Department of Geology, Lund University, 223 62 Lund, Sweden
2
Geological Survey of Denmark and Greenland (GEUS), 1350 Copenhagen, Denmark
3
School of Earth Sciences, The University of Western Australia, Crawley 6009, Australia
*
Author to whom correspondence should be addressed.
Received: 28 June 2018 / Revised: 14 August 2018 / Accepted: 16 August 2018 / Published: 24 August 2018
(This article belongs to the Special Issue Geology of the Early Earth – Geodynamic Constraints from Cratons)
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Abstract

Ferroan granitoid intrusions are rare in the Archaean rock record, but have played a large role in the evolution of the Proterozoic crust, particular in relation to anorthosite-mangerite-charnockite-granite suites. Here we discuss the petrogenesis of the ca. 2785–2805 Ma ferroan Ilivertalik Intrusive Complex, which has many geochemical similarities to Proterozoic iron rich granitoids. We present major and trace element whole rock chemistry and combined in-situ zircon U-Pb, Hf and O isotope data. The intrusive complex divides into: (i) minor tabular units of mainly diorite-tonalite compositions, which are typically situated along contacts to the host basement and (ii) interior larger, bodies of mainly granite-granodiorite composition. Geochemically these two unites display continuous to semi-continuous trends in Haker-diagrams. Whole rock REE enrichment display increases from Yb to La, from 10–25 to 80–100 times chondrite, respectively. The diorite-tonalite samples are generally more enriched in REE compared to the granite-granodiorite samples. The complex has hafnium isotope compositions from around +1.5 to −2.5 epsilon units and δ18O compositions in the range of 6.3 to 6.6‰. The complex is interpreted to be derived from partial melting in a crustal source region during anomalously high crustal temperatures. View Full-Text
Keywords: ferroan granite; zircon geochronology; geochemistry; Archaean geology ferroan granite; zircon geochronology; geochemistry; Archaean geology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Næraa, T.; Kokfelt, T.F.; Scherstén, A.; Petersson, A. The ca. 2785–2805 Ma High Temperature Ilivertalik Intrusive Complex of Southern West Greenland. Geosciences 2018, 8, 319.

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