TY - JOUR
T1 - Constraining timing of brittle deformation and fault gouge formation in the Sydney Basin
AU - Och, D.J.
AU - Offler, R.
AU - Zwingmann, Horst
PY - 2014
Y1 - 2014
N2 - Structural and K-Ar dating studies of gouge in N-S, NNE and E-W-trending faults in four locations in the Sydney-Hunter region are reported. The fault zones are manifest as joint swarms and highly brecciated zones containing gouge with authigenic illite produced as a result of fluid infiltration. Strike-slip movement accompanied by minor dip-slip, normal movement occurred on the NNE faults, with dip slip on N-S and E-W-trending faults. In this study, gouge from a NE-trending, steep, SE-dipping fault showing dip-slip movement at Cut 10, on the Hunter Expressway and from an E-W-trending, steep south-dipping, normal fault at the Westside Open Cut, Lake Macquarie have been analysed. K-Ar dating of illite and illite-smectite in fractions extracted from fault gouges in areas unaffected by a thermal overprint reveals ages varying from 166 to 119 Ma for the
AB - Structural and K-Ar dating studies of gouge in N-S, NNE and E-W-trending faults in four locations in the Sydney-Hunter region are reported. The fault zones are manifest as joint swarms and highly brecciated zones containing gouge with authigenic illite produced as a result of fluid infiltration. Strike-slip movement accompanied by minor dip-slip, normal movement occurred on the NNE faults, with dip slip on N-S and E-W-trending faults. In this study, gouge from a NE-trending, steep, SE-dipping fault showing dip-slip movement at Cut 10, on the Hunter Expressway and from an E-W-trending, steep south-dipping, normal fault at the Westside Open Cut, Lake Macquarie have been analysed. K-Ar dating of illite and illite-smectite in fractions extracted from fault gouges in areas unaffected by a thermal overprint reveals ages varying from 166 to 119 Ma for the
U2 - 10.1080/08120099.2014.906503
DO - 10.1080/08120099.2014.906503
M3 - Article
VL - 61
SP - 337
EP - 350
JO - Australian Journal of Earth Sciences
JF - Australian Journal of Earth Sciences
SN - 0812-0099
IS - 3
ER -