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• W1786582172 abstract "This study attempts to deduce the Phanerozoic tectonic relation-ships of Australia, Antarctica and New Zealand, and then to discuss in greater detail the evolution of New Zealand and of the continental margin of south-cast Australia. Plate tectonics provides a broad conceptual framework for the syntheses proposed, but the emphasis throughout is based on objective analysis of the data available. Flow-charts and time-space plots are developed as aids in construction and evaluation of the tectonic syntheses.Various criteria are used to define and reassemble Australia, Antarctica, New Zealand and surrounding areas of continental crust as parts of the former Gondwanaland in the Mesozoic. A brief review of the Paleozoic (exposed mainly in eastern Australia), outlines the pro-gressive development and cratonisation of a very complex orogenic belt bordering the Pacific Ocean. During the Mesozoic an Atlantic-type continental margin was established east of this belt, and is now best exposed in New Zealand. Orogenesis along this margin accompanied sub-duction of the Pacific plate during the Upper Jurassic to Lower Cret-aceous Rangitata Orogeny. The resulting orthotectonic belt exhibits contrasting structural and metamorphic styles of foreland and oceanward sides.Fragmentation of Gondwanaland began in the Jurassic by develop-ment of an extensive rift valley system, which is studied in detailin the sedimentary basins of south-east Australia (Otway, Bass and Gippsland Basins), largely from sub-surface oil-company exploration data. The structural evolution of these basins is controlled by the initial rift configuration, and neither pre-existing basement structures, nor transform faults related to Tertiary sea-floor spreading, appear to have much influence.Published marine magnetic data constrain a geometric synthesis of the sea-floor spreading history. From 85 to 60 million years ago, the Tasman Sea was opening between Australia, Antarctica and New Zea-land, about a rotation centre near northern Queensland. Following separation of Australia and Antarctica about 55 million years ago, anew three-plate geometry was established. In this system the Australian-Pacific plate boundary displays a complex history involving regions of subduction and transcurrent faulting. The Alpine Fault (which became active about 20 million years ago) and the severe Tertiary deformation in New Zealand are closely related to the sea-floor spreading history.The various aspects of the regional tectonic history studied all indicate that the plate tectonic hypothesis is both a valid and useful new approach in geology. They are also predictive, and point to many new problems which might be investigated." @default.
• W1786582172 created "2016-06-24" @default.
• W1786582172 creator A5020572950 @default.
• W1786582172 date "1973-01-01" @default.
• W1786582172 modified "2023-09-27" @default.
• W1786582172 title "Tectonic history of the South-West Pacific region" @default.
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