Early Palaeozoic subduction in the southeastern Lachlan Fold Belt, Batemans Bay, New South Wales
Titel:
Early Palaeozoic subduction in the southeastern Lachlan Fold Belt, Batemans Bay, New South Wales
Auteur:
Prendergast, E. I.
Verschenen in:
Australian journal of earth sciences
Paginering:
Jaargang 54 (2007) nr. 4 pagina's 481-501
Jaar:
2007-06
Inhoud:
The southeastern Lachlan Fold Belt at Batemans Bay on the New South Wales south coast is an accretionary complex with a prolonged deformation history. Early features include synsedimentary folds, melange, disaggregated bedding and faults. Fabrics within the clast-in-matrix melange and mudstone match those found in cores from the lower slopes of modern accretionary prisms. At the toe of the accretionary prism, the contact between the craton-derived Adaminaby Group and ocean floor deposits of the Wagonga Group is conformable. As subduction continued, the early structures were overprinted by (D1) deformation that produced meridional north - south-trending, tight to isoclinal folds (F1) and associated axial-plane cleavage (S1). This west-dipping subduction occurred in the Late Ordovician/Early Silurian but probably began much earlier. A younger regional deformation (D2) resulted in north - south-trending, open to tight folds (F2), slightly oblique to F1, and an axial-surface cleavage (S2).
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