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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Deformation & metamorphismGilbert Fold beltRegional studies have suggested the following eventsD1• mainly E-W folds with strong cleavage/foliation• dominant regional structures;• lower greenschist <strong>to</strong> amphibolite metamorphism• usually thought <strong>to</strong> be ~1590Ma, based on SHRIMP dates from Dargalong areafarther north.D2• approx N-S folds superimposed on E-W structures,• restricted <strong>to</strong> E half <strong>of</strong> outcrop area;• multiple mesoscopic fabrics;• most workers have associated D2 with peak amphibolite facies metamorphismand emplacement <strong>of</strong> Forsayth Supersuite (S-type anatectic granites) andcommon metamorphic zircon growth at 1550-1560MaD3 - E-W folds, restricted <strong>to</strong> central part <strong>of</strong> areaLater open folds, possibly early Palaeozoic