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A Yilgarn seed to the Pilbara Craton (Australia)? Evidence from inherited zircons
Swedish Museum of Natural History, Department of Geology. University of Western Australia.ORCID iD: 0000-0002-0533-1162
2019 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, ISSN 0091-7613, Vol. 47, no 11, p. 1098-1102Article in journal (Refereed) Published
Abstract [en]

Knowledge of the age and compositional architecture of Archean cratonic lithosphere is critical for models of geodynamics and continental growth on early Earth, but can be difficult to unravel from the exposed geology. We report the occurrence of numerous >3.7 Ga zircon crystals in 3.45 Ga rhyolites of the eastern Pilbara Craton (Western Australia), which preserve evidence for an Eoarchean meta-igneous component in the deep Pilbara crust. This inherited zircon population shares similar and distinctive age and Hf-O isotope characteristics with the oldest gneissic components of the Yilgarn Craton ∼500 km farther south, suggesting a common ca. 3.75 Ga felsic crustal nucleus to these two Archean granite-greenstone terranes. We infer a pivotal role for such ‘seeds’ in facilitating the growth and persistence of Archean continental lithosphere.

Place, publisher, year, edition, pages
2019. Vol. 47, no 11, p. 1098-1102
Keywords [en]
Pilbara; Yilgarn; crustal ecolution; zircon; Lu–Hf; oxygen isotopes; U–Pb
National Category
Geochemistry Geology
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3636DOI: 10.1130/G46696.1OAI: oai:DiVA.org:nrm-3636DiVA, id: diva2:1377922
Funder
Swedish Research Council, 2016–00261Available from: 2019-12-13 Created: 2019-12-13 Last updated: 2019-12-13Bibliographically approved

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