Palaeoproterozoic to Mesoproterozoic Geology of North Queensland
Palaeoproterozoic to Mesoproterozoic Geology of North Queensland
Palaeoproterozoic to Mesoproterozoic Geology of North Queensland
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Einasleigh MetamorphicsStructural his<strong>to</strong>ry 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 in<strong>to</strong> anatectic granite with SHRIMP zirconpopulations <strong>of</strong> ~1560Ma (magmatic?) and 1568, 1595 and 1617Ma inheritanceMetamorphic zircons at 1552Ma in amphibolite and mafic granulite and ~1560Main leucogneiss and paragneiss; inferred <strong>to</strong> date D2/M2Work by Quin<strong>to</strong>n Hills (Monash) suggests that 1675Ma amphibolite postdates amigmatitic layering – amphibolite at Einasleigh also appears <strong>to</strong> postdate and earlyfoliationTherefore Einasleigh Metamorphics or part there<strong>of</strong> may be basement <strong>to</strong> the res<strong>to</strong>f the Etheridge Group