Onset of new, progressive crustal growth in the central Slave craton at 3.55 Ga

J. R. Reimink, D. G. Pearson, S. B. Shirey, R. W. Carlson, J. W.F. Ketchum

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Abstract

Ancient rock samples are limited, hindering the investigation of the processes operative on the Earth early in its history. Here we present a detailed study of well-exposed crustal remnants in the central Slave craton that formed over a 1 billion year magmatic history. The tonalitic-granodioritic gneisses analysed here are broadly comparable to common suites of rocks found in Archean cratons globally. Zircon Hf isotope data allow us to identify a major change positive eHf starting at ~3.55 Ga. The crust production processes and spatial distribution of isotopic compositions imply variable interaction with older crust, similar to the relationships seen in modern tectonic settings; specifcally, long-lived plate margins. A majority of the Slave craton might have been formed by a similar mechanism.

Original languageEnglish (US)
Pages (from-to)8-13
Number of pages6
JournalGeochemical Perspectives Letters
Volume10
DOIs
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Geology
  • Geochemistry and Petrology

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