Palaeoproterozoic to Mesoproterozoic Geology of North Queensland

Einasleigh MetamorphicsStructural history not well constrainedDeformation & metamorphismMultiple foliations, including an early composite layer-parallel foliation, on whichare superimposed broadly E-W and N-S regional foldsExtensive migmatite terrains grading into anatectic granite with SHRIMP zirconpopulations of ~1560Ma (magmatic?) and 1568, 1595 and 1617Ma inheritanceMetamorphic zircons at 1552Ma in amphibolite and mafic granulite and ~1560Main leucogneiss and paragneiss; inferred to date D2/M2Work by Quinton Hills (Monash) suggests that 1675Ma amphibolite postdates amigmatitic layering – amphibolite at Einasleigh also appears to postdate and earlyfoliationTherefore Einasleigh Metamorphics or part thereof may be basement to the restof the Etheridge Group