Sedimentary Basins and Crustal Processes at Continental Margins: From Modern Hyper-extended Margins to Deformed Ancient Analogues

Continental margins and their fossilized analogues are important repositories of natural resources. With better processing techniques and increased availability of high-resolution seismic and potential field data, imaging of present-day continental margins and their embedded sedimentary basins has reached unprecedented levels of refinement and definition, as illustrated by examples described in this volume. This, in turn, has led to greatly improved geological, geodynamic and numerical models for the crustal and mantle processes involved in continental margin formation from the initial stages of rifting through continental rupture and break-up to development of a new ocean basin. Further informing these models, and contributing to a better understanding of the features imaged in the seismic and potential field data, are observations made on fossilized fragments of exhumed subcontinental mantle lithosphere and ocean–continent transition zones preserved in ophiolites and orogenic belts of both Palaeozoic and Mesozoic age from several different continents, including Europe, South Asia and Australasia.
Structural analysis of extended Australian continental crust: Capel and Faust basins, Lord Howe Rise
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Published:January 01, 2015
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CiteCitation
Karen Higgins, Takehiko Hashimoto, Nadège Rollet, Jim Colwell, Ron Hackney, Peter Milligan, 2015. "Structural analysis of extended Australian continental crust: Capel and Faust basins, Lord Howe Rise", Sedimentary Basins and Crustal Processes at Continental Margins: From Modern Hyper-extended Margins to Deformed Ancient Analogues, G. M. Gibson, F. Roure, G. Manatschal
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Abstract
The Capel and Faust basins (northern Lord Howe Rise) are located in the SW Pacific between Australia, New Zealand and New Caledonia. New seismic, gravity, magnetic and bathymetry data and rock samples have enabled the construction of a three-dimensional geological model providing insights into the crustal architecture and basin stratigraphy. Multiple large depocentres up to 150 km long and 40 km wide, containing over 6 km of sediment, have been identified. These basins probably evolved through two major Early Cretaceous rifting episodes leading to the final break-up of the eastern Gondwanan margin. Pre-break-up plate restorations and potential field data suggest that pre-rift basement is a collage of several discrete terranes, including a Palaeozoic orogen, pre-rift sedimentary basins and rift-precursor igneous rocks. It is likely that a pre-existing NW-trending basement fabric, inherited from the New England Orogen (onshore eastern Australia), had a strong influence on the evolution of basin architecture. This basement fabric was subjected to oblique rifting along an east–west vector in the ?Early Cretaceous to Cenomanian and NE–SW-oriented orthogonal rifting in the ?Cenomanian to Campanian. This has resulted in three structural provinces in the study area: Eastern Flank, Central Belt and Western Flank.
- Australasia
- Australia
- basement
- basin analysis
- bathymetry
- continental crust
- Cretaceous
- crust
- Deep Sea Drilling Project
- domains
- DSDP Site 208
- geophysical methods
- geophysical profiles
- geophysical surveys
- Gondwana
- gravity methods
- Leg 21
- Lord Howe Rise
- Lower Cretaceous
- magnetic methods
- Mesozoic
- New England Orogeny
- Pacific Ocean
- paleogeography
- plate boundaries
- plate tectonics
- reconstruction
- rift zones
- rifting
- seismic methods
- seismic profiles
- South Pacific
- Southwest Pacific
- structural analysis
- surveys
- Tasman Sea
- tectonics
- tectonostratigraphic units
- terranes
- three-dimensional models
- West Pacific
- Faust Basin
- Capel Basin