${session.getAttribute("locale")} 5 K-Ar dating of fault gouge in the northern Sydney Basin, NSW, Australia-implications for the breakup of Gondwana 2 μm), 237–245 Ma for the <2 μm fraction, 218 Ma for the <0.4 μm fraction and 196 Ma for the <0.1 μm fraction have been obtained from siltstones within and outside the damage zone. We believe the younger ages of 196–237 Ma indicate the time at which diagenetic illite–smectite formed and the 122–150 Ma dates from the <2 μm fraction represent the maximum age of gouge formation. The younger ages are thought to reflect the last slip event occurring on the faults, which is related to the rifting and dispersal of the eastern margin of the Australian continent.]]> Tue 05 May 2015 10:48:20 EST ]]>