Geochemical mapping of lithospheric architecture disproves Archean terrane accretion in the Yilgarn craton

R. H. Smithies, K. Gessner, Y. Lu, C. L. Kirkland, T. Ivanic, J. R. Lowrey, D. C. Champion, J. Sapkota, Q. Masurel, N. Thébaud, R. Quentin de Gromard

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The basement of Mesoarchean to Neoarchean greenstone basins in the Yilgarn craton is composed of fragments of evolved crust up to 3.7 Ga old. New cratonwide geochemical and isotopic data with unparalleled spatial resolution image a NE- to ENE-trending architecture in pre–2.73 Ga crust. These trends cannot be reconciled with plate-tectonic models, as they persist across younger NNW-striking structural fabrics, including a proposed suture previously interpreted to result from exotic terrane accretion. Our results suggest that, in spite of their substantial strike length, the NNW-trending structures have limited horizontal displacement and, although important for understanding regional geology, may be a geodynamically insignificant overprint of the primary ENE-trending architecture. We propose that these greenstone provinces or belts include individual basins formed in rifts with location, size, and orientation influenced by the interaction between basement fragments and regional crustal extension.

Original languageEnglish
Pages (from-to)141-146
Number of pages6
JournalGeology
Volume52
Issue number2
Early online date8 Dec 2023
DOIs
Publication statusPublished - 2024

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