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Details van artikel 9 van 20 gevonden artikelen
| Titel: |
Mega kink folds and related structures in the Upper Devonian Merrimbula Group, south coast of New South Wales |
| Auteur: |
Rixon, L. K. Bucknell, W. R. Rickard, M. J. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 30 (1983) nr. 3-4 pagina's 277-293 |
| Jaar: |
1983-12 |
| Inhoud: |
Interbedded sandstones and red mudstones of the Upper Devonian Merrimbula Group on the south coast of N.S.W. were mildly deformed during the Carboniferous in a 'transitional' tectonic regime. A remarkable variety of structures was developed. Tectonic shortening of about 10% was accommodated by the development of kink-like monoclines and box folds with very wide-spaced (few cm) cleavage in sandstones, spaced (few mm) 'reticulate' cleavage in siltstones, and a penetrative slaty cleavage in mudstones. Solution transfer played an important role in cleavage formation. Faults and conjugate shear zones, followed by regional joints, were developed in competent beds. Abundant quartz veins occur in bedding planes, faults and shear zones. The low strain allows certain kinematic and dynamic conclusions: the structures are geometrically congruent, were developed under high fluid pressures at a high level in the crust, and are related to a single, long deformational episode under essentially horizontal E-W compression, possibly accompanied by shearing along bedding planes associated with local decollement. The stress configuration contrasts with that necessary for the wrench faulting and extensional rifting postulated for the period immediately prior to the deposition of the Merrimbula Group. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 20 gevonden artikelen
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