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• W2021855641 abstract "Pre-Carboniferous rocks of Tasmania comprise two disparate terranes which were brought together during the middle Palaeozoic. The Eastern Tasmania Terrane consists of middle Palaeozoic granitoids and the Mathinna Group, a turbidite succession of Ordovician to Early Devonian age. The older part of the adjacent Western Tasmania Terrane, the only part of the southern Tasmanides with exposed Precambrian basement, is related to the Kanmantoo Fold Belt and older tectonic provinces located northwest of Tasmania. The younger part of the Western Tasmania Terrane comprises Upper Cambrian to Lower Devonian terrestrial to shallow-marine siliciclastics and carbonates—a marked contrast to the coeval deep-water deposits of the Mathinna Group. The contact between the two terranes is concealed by the Tamar Valley in northern Tasmania. The main folds in the Eastern Tasmania Terrane verge to the northeast, whereas structures in the adjacent Western Tasmania Terrane indicate tectonic transport to the southwest, with the break in structural facing coinciding with the Tamar Valley. Reinvestigation of the structure of the westernmost Eastern Tasmania Terrane, where there is a large recumbent F1-fold (> 10 km extent in profile view), raises the possibility that a second generation of structures, previously regarded as of only local importance, could have caused rotation of the upright to steeply west-dipping axial surfaces of F1-folds to recumbent attitudes during southwesterly-directed thrusting. In this interpretation, recumbent or near-recumbent zones could reflect ramps in a sole thrust, and the mid-Devonian imbricate thrust zone near Beaconsfield on the west bank of the Tamar River would be either the frontal thrust system or a splay off the sole thrust which continues westward beneath the exposed ?Precambrian Badger Head Block. The implications of this new interpretation are that docking of the Eastern and Western Tasmania terranes must have occurred after the Ordovician but before the Middle Devonian. During the consolidation phase there were two deformations of the Mathinna Group. The first, which occurred in the Early Devonian prior to emplacement of the St Marys Porphyrite (388 ± 1 Ma), produced upright to locally overturned folds verging to the northeast. The second, which took place during the early Middle Devonian before deposition of Givetian cave deposits, resulted in the Mathinna Group being thrust southwestward. This sense of thrusting is opposite to the direction of thrusting at the same time in the Melbourne zone of Victoria, where the fold-and-thrust belt verges eastward away from the craton. A concealed Devonian transfer fault zone in Bass Strait could account for this change of polarity." @default.
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• W2021855641 date "1992-11-01" @default.
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• W2021855641 title "Tectonic affinity of the Mathinna Group in the Lachlan Fold Belt" @default.
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• W2021855641 doi "https://doi.org/10.1016/0040-1951(92)90197-e" @default.
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