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Influence of along-strike pre-orogenic sedimentary tapering on the internal architecture of experimental thrust wedges

R. SOTO^*,, F. STORTI, A. M. CASAS^* and C. FACCENNA

^* Dpto. Ciencias de la Tierra, Universidad de Zaragoza, C/Pedro Cerbuna, 50009 Zaragoza, Spain
Dip. di Scienze Geologiche, Universitá degli Studi ‘Roma Tre’, Largo S. L. Murialdo 1, I-00146 Rome, Italy

Author for correspondence: rsoto{at}posta.unizar.es

The occurrence of along-strike thickness variations in pretectonic sedimentary packages is expected to influence the structural architecture of doubly verging thrust wedges. To test this hypothesis, we used laboratory sandbox experiments. Model results show that longitudinal tapering of pretectonic sediments causes a great complexity in the internal tectonic fabric of the wedge, particularly in the pro-wedge, dominated by highly segmented, curvilinear thrusts. The along-strike variation of the mode by which the same amount of bulk contraction is accommodated in different regions of the orogen produces the obliquity of the deformation fronts in both the pro-wedge and the retro-wedge. Comparison with the overall architecture of the Lesser Antilles and Manila accretionary systems validates our experimental results.

Key Words: sandbox models • accretionary wedges • compression tectonics • stratigraphic wedges • thrust

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