Collision-related granitic magmatism in the Granites–Tanami Orogen, Western Australia

Tectono-thermal evolution of the Palaeoproterozoic Granites–Tanami Orogen, North Australian Craton: Implications from hornblende and biotite 40Ar/39Ar geochronology

“…These rocks appear to be related to late syn-to postcollisional tectonic settings within a~30 Ma million year long period of magmatic activity broadly spanning ca. 1825-1791 Ma (Smith, 2001), but predominantly being emplaced during 1795 Ma (Bagas et al, 2010). The granitic plutons have been assigned to the Birthday, Frederick and Grimwade suites by Dean (2001).…”

“…The granitic plutons have been assigned to the Birthday, Frederick and Grimwade suites by Dean (2001). Detail studies by Bagas et al (2010) suggest that the magmas forming the granitic plutons of Grimwade Suite were derived from a crustal source in response to the continental thickening after collision between the GTO and the Arunta Orogen during around 1795 Ma.…”

“…The Tanami Orogeny in the GTO along the southern part of the NAC and the Stafford Event in the Arunta Orogen along the northern part of the Central Australian Craton represent a separate and distinct orogeny not related to the Halls Creek nor Tennant orogenies (Bagas et al, 2010;Collins and Shaw, 1995;Scrimgeour, 2006). The Tanami-Stafford orogeny represents a continent-continent collision between the GTO and the Arunta Orogen of the Central Australian Craton during ca.…”

“…Etheridge et al, 1987;Page and Lithos 206-207 (2014) [262][263][264][265][266][267][268][269][270][271][272][273][274][275][276] Williams, 1988). The GTO records: (i) the formation of the Tanami backarc basin Li et al, 2013a); (ii) collision and amalgamation of the GTO with the Arunta Orogen of the Central Australian Craton along the Willowra Lineament (Bagas et al, , 2010(Bagas et al, , 2014; (iii) convective removal of a thickened lithospheric mantle root and lithosphere extension (Li et al, 2013a); (iv) collisional to post-collisional mafic to North Australian Craton C e n t r a l A u s t r a l i a n C r a t o n Pine Creek H a ll s C re e k Willowra Lineament G r a n it e s -T a n a m i Panel (a) is modified after Pirajno and Bagas, 2008 and panel (b) is after Bagas et al, 2014. felsic magmatism; (v) and up to amphibolite facies metamorphism associated with intense crustal shortening in two separate tectonic events during ca. 1850-1790 Ma (Bagas et al, , 2014Li et al, 2013a).…”

“…Bagas et al (2009Bagas et al ( , 2010Bagas et al ( , 2014 propose that gold mineralisation in the region is associated with collision between the GTO and the Arunta Orogen to the south at ca. 1795 Ma.…”