The influence of granitoids on gold mineralisation in the Yilgarn Craton has been hotly contested. They have been invoked as sources of metals and heat, or locations of local stress heterogeneity for subsequent deformation and mineralisation. The Mick Adam gold deposit is hosted in the thin, tail-like extension of a tonalite pluton (Kintore Tonalite) located on the Kunanalling Shear Zone in the Kalgoorlie Terrane of the Yilgarn Craton, Western Australia. The deposit and shear zone are contained within a mafic-ultramafic sequence. Preliminary data on the geometric relationship between gold bearing, southwest dipping quartz extension veins and shearing along the tonalite-basalt contact indicates that mineralisation occurred during normal dip-slip shear on the tonalite-basalt contact. The field data is consistent with either a period of extension in the regional deformation sequence, or local dilation resulting from strain heterogeneities due to the rheology and shape of the Kintore tonalite.
|Number of pages||4|
|Publication status||Published - 2013|