TY - JOUR
T1 - The structure of kangaroo island, south australia
T2 - Strain and kinematic partitioning during delamerian basin and platform vreactivation
AU - Flottmann, T.
AU - James, P.
AU - Menpes, R.
AU - Cesare, P.
AU - Twining, M.
AU - Fairclough, M.
AU - Randabel, J.
AU - Marshak, S.
N1 - Funding Information:
This work was supported by an Australian Research Council grant to Pat James. The South Australian Department of Mines and Energy provided logistic support. We benefited greatly from discussions with Tony Belperio, Richard Jenkins, Ken McClay and Wolfgang Preiss who also reviewed early versions of the manuscript. We also enjoyed encouraging reviews of the final version of the paper by Chris Fergusson and Kingsley Mills. Sherry Proferes and Richard Barrett assisted with thefigures andphotographs, respectively.
PY - 1995/2
Y1 - 1995/2
N2 - Kangaroo Island forms the southern part of the Fleurieu arc-segment of the Adelaide Fold-Thrust Belt. The Island consists of three structurally distinct lithotectonic domains. In the southern zone basinal and regionally metamorphosed Cambrian Kanmantoo Group strata are deformed by regional southwest-trending folds and thrusts. The Kangaroo Island Shear Zone forms a broad east-west-trending strongly transposed zone, which consists of anastomosing mylonitic phyllonites. Along this shear zone the basinal strata are transpressionally displaced towards the northwest. Most of the exposed hangingwall of the shear zone is formed by a regionalscale northerly overturned anticline, and parts of the footwall are also overturned. The northern zone forms a 15 km wide foreland thrust belt incorporating a veneer of Cambrian platformal sediments, that overlie the southernmost extension of the Gawler Craton in South Australia. These rock types, which are absent on the Fleurieu Peninsula mainland, are displaced along discrete north-vergent thrusts and reverse faults. The lithotectonic domains of Kangaroo Island reflect a basin evolution which is geometrically and in part also sedimentologically distinct from the mainland. The original geometry of the east-west oriented basin appears to be the principal factor that controlled the structural partitioning between the lithotectonic domains of Kangaroo Island during the Cambro-Ordovician Delamerian Orogeny, which resulted in basin inversion and northwest-directed contraction.
AB - Kangaroo Island forms the southern part of the Fleurieu arc-segment of the Adelaide Fold-Thrust Belt. The Island consists of three structurally distinct lithotectonic domains. In the southern zone basinal and regionally metamorphosed Cambrian Kanmantoo Group strata are deformed by regional southwest-trending folds and thrusts. The Kangaroo Island Shear Zone forms a broad east-west-trending strongly transposed zone, which consists of anastomosing mylonitic phyllonites. Along this shear zone the basinal strata are transpressionally displaced towards the northwest. Most of the exposed hangingwall of the shear zone is formed by a regionalscale northerly overturned anticline, and parts of the footwall are also overturned. The northern zone forms a 15 km wide foreland thrust belt incorporating a veneer of Cambrian platformal sediments, that overlie the southernmost extension of the Gawler Craton in South Australia. These rock types, which are absent on the Fleurieu Peninsula mainland, are displaced along discrete north-vergent thrusts and reverse faults. The lithotectonic domains of Kangaroo Island reflect a basin evolution which is geometrically and in part also sedimentologically distinct from the mainland. The original geometry of the east-west oriented basin appears to be the principal factor that controlled the structural partitioning between the lithotectonic domains of Kangaroo Island during the Cambro-Ordovician Delamerian Orogeny, which resulted in basin inversion and northwest-directed contraction.
KW - Adelaide Fold-Thrust Belt
KW - Delamerian structure
KW - Kangaroo Island
KW - Shear zone
KW - South Australia
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U2 - 10.1080/08120099508728177
DO - 10.1080/08120099508728177
M3 - Article
AN - SCOPUS:0028881411
SN - 0812-0099
VL - 42
SP - 35
EP - 49
JO - Australian Journal of Earth Sciences
JF - Australian Journal of Earth Sciences
IS - 1
ER -