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Erosion of orogenic wedges - a sandbox view

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K. S. PERSSON, D. SOKOUTIS
K. S. PERSSON, D. SOKOUTIS

Abstract


Sandbox models give insights into the progressive development of two-sided orogenic wedges. Effective indenters, that develop in models without erosion for rigid indenter face-dips of 75 ° or 15 °, are strongly affected by erosion. No effective indenters develop in models with moderate and total erosion when the rigid indenter face-dip is 75°. In models with rigid indenter face-dips of 15° effective indenters develop but are smaller in size when erosion is applied. If the effective indenter is smaller, strain partitioning by compaction decreases in favor of strain partitioning by imbricate shear. Models with rigid indenter face-dips of 15° and 30° and without redeposition favor strain partitioning by development of new shears.


Keywords


effective indenter; erosion; orogenic wedge; sandbox modelling;

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References


BEAUMONT, C, FULLSACK, P. & HAMILTON, J. 1992. Erosional control of active compressional orogens. In Thrust Tectonics, ed. K.R. McClay, pp. 1-18. Chapman and Hall, London.

BEAUMONT, C , FULLSACK, P. & HAMILTON, J. 1994. Styles of crustal deformation in compressional orogens caused by subduction of the underlying lithosphère. Tectonophysics 232, 119-132.

BONINI, M., SOKOUTIS, D., TALBOT, C.J., BOCCALETTI, M. & MILNES, A.G. 1999. Indenter growth in analogue models of Alpine-type deformation. Tectonics, 18, 119-128.

BYERLEE, J. 1978. Friction of rocks. Pure and Applied Geophysics 116, 615-626.

COLETTA, Β., LETOUZEY, J., PINEDO, R., BALLARD, J.F. & BALE, P. 1991. Computerized X-ray tomography analysis of sandbox models: Examples of thin-skinned thrust systems. Geology 19, 1063-1067.

DAVY, C. & COBBOLD, PR. 1988. Indentation tectonics in nature and experiment. 1. Experiments scaled for gravity. Bulletin of the Geological Institutions of Uppsala 14, 129-141.

KOONS, P.O. 1990,. Two-sided orogen: Collision and erosion from sandbox to the Southern Alps, New Zealand. Geology 18, 679-682.

MALAVIEILLE, J. 1984.. Modélisation expérimentale des chevauchements imbriqués: application aux chaînes de montagnes. Bull. Soc. géol. France 7, 129-138.

MERLE, Ο 1994. Syn-convergence exhumation of the central Alps. Geodinamica Acta 7, 3, 129-138.

MERLE, Ο. & ABIDI, Ν. 1995.. Approche expérimentale du fonctionnement des rampes émergentes. Bulletin de la Société géologique de la France 166, 439-450.

MULUGETA, G. 1988. Modelling the geometry of Coulomb thrust wedges. Journal of Structural Geology 10, 847-859.

MULUGETA, G. & KOYI, H. 1987. Three-dimensional geometry and kinematics of experimental piggyback thrusting. Geology 15, 1052-1056.

MULUGETA, G. & KOYI, H. 1992. Episodic accretion and strain partitioning in a model sand wedge. Tectonophysics 202, 319-333.

PERSSON, K. (in press) Effective indenters and the development of double-vergent orogens - insights from analogue sand models, in Koyi, H.A. and Mancktelow, N.S., eds., Tectonic Modeling: A volume in Honor of Hans Ramberg, Boulder, Colorado, Geological Society of America Memoir 193.

RATSCHBACHER, L., MERLE, O., DAVY, P. & COBBOLD, P. 1991. Lateral extrusion in the eastern Alps, part 1: boundary conditions and experiments scaled for gravity. Tectonics 10, 245-256.

TAPPONNIER, P. & MOLNAR, P. 1976. Slip-line field theory and large-scale continental tectonics. Nature 264, 319-324.

TAPPONNIER, P., PELZER, G., LE DAIN, A.Y, ARMIJO, R. & COBBOLD, P. 1982. Propagating extrusion tectonics in Asia: new insights from simple experiments with plasticine. Geology 10, 611-616.

TAPPONNIER, P., PELZER, G. & ARMIJO, R. 1986, On the mechanism of collision between India and Asia. In Collision Tectonics, eds Coward, M.P and Ries, A.C., Spec. Pubi. Geol. Soc. London 19, 115-157.

THOMPSON, A.B., SCHULMANN, Κ. & JEZEK, J. 1997. Extrusion tectonics and elevation of lower crustal metamorphic rocks in convergent orogens. Geology 6, 491-494.

WILLETT, S., BEAUMONT, C. & FULLSACK, P. 1993. Mechanical model for the tectonics of doubly vergent compressional orogens. Geology 21, 371-374.


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