Geodynamics of the eastern Yilgarn Craton

New age constraints on metamorphism, metasomatism and gold mineralisation at Plutonic Gold Mine, Marymia Inlier, Western Australia

“…This is consistent with the timing of metamorphism in the Yilgarn Craton (e.g., Czarnota et al, 2010;Goscombe, Blewett, Czarnota, Groenewald, & Mass, 2009;Groves et al, 2000). We identified no minerals or mineral assemblages that would enable to further constrain the timing of this major metamorphic episode.…”

Crustal evolution, intra-cratonic architecture and the metallogeny of an Archaean craton

“…Compositionally, late Archaean granites across the craton belong to two primary groups, the High-Ca and Low-Ca granites, which account for c. 60 and 20% of the total surface area of Yilgarn granites, respectively (Champion & Sheraton 1997;Czarnota et al 2010). In addition, there are three minor groups: the Mafic, Syenitic and High-HFSE (high field strength element) groups.…”

“…Based on Figures 10 and 11, it is likely that the juvenile addition and reworking signatures are spatially controlled, with the more juvenile source occurring in the east of the terrane and reworked magmas occurring in the west. The reworked areas are likely to be part of, or heavily contaminated by, the Southern Cross Domain (Champion & Sheraton 1997;Cassidy et al 2002;Czarnota et al 2010). In terms of geodynamics, the Sm-Nd array could represent crustally contaminated melts from the retreating or collapsing (Kumagai et al 2007;Kumagai et al 2008) c. 2700 Ma plume (Campbell & Hill 1988), or tectonic movement of the crust away from plume-sourced juvenile material.…”

Zircon Lu–Hf isotopes and granite geochemistry of the Murchison Domain of the Yilgarn Craton: Evidence for reworking of Eoarchean crust during Meso-Neoarchean plume-driven magmatism

“…1) -the Narryer, Youanmi and South West terranes -and the Eastern Goldfields Superterrane (EGST), an interpreted collage of terranes formed during 2690-2640 Ma subduction, arc magmatism, terrane accretion, and collisional orogeny (e.g. Barley et al, 2008;Czarnota et al, 2010;Kositcin et al, 2008). The Ida Fault separates the Youanmi Terrane from the EGST to the east.…”