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The effect of décollement dip on geometry and kinematics of model accretionary wedges.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
bBureau of Economic Geology, University of Texas at Austin, USA.
2003 (English)In: Journal of Structural Geology, ISSN 0191-8141, Vol. 25, no 9, 1445-1450 p.Article in journal (Refereed) Published
Abstract [en]

We conducted a series of sand-box models shortened asymmetrically above a frictional-plastic de´collement to study the influence ofamount and sense of the de´collement dip on the geometry and kinematics of accretionary wedges. Model results illustrate that the amount anddirection of de´collement dip strongly influence the geometry and mode of deformation of the resulting wedge. In general, for models havingsimilar de´collement frictional parameters, the resulting wedge is steeper, grows higher and is shorter when shortened above a de´collementthat dips toward the hinterland. At 42% bulk shortening, the length/height ratio of wedges formed above a 58-dipping de´collement was equalto 2.4 whereas this ratio was equal to 3 for wedges shortened above a horizontal de´collement. Moreover, models with a hinterland dippingde´collement undergo larger amounts of layer parallel compaction (LPC) and area loss than models shortened above a non-dippingde´collement. The effect of de´collement dip on wedge deformation is most pronounced when basal friction is relatively high (mb ¼ 0.55),whereas its effect is less significant in models where the basal de´collement has a lower friction (mb ¼ 0.37). Model results also show thatincreasing basal slope has a similar effect to that of increasing basal friction; the wedge grows taller and its critical taper steepens.

Place, publisher, year, edition, pages
2003. Vol. 25, no 9, 1445-1450 p.
Keyword [en]
Accretionary wedges, Sand-box models, De´collement dip, basal friction
National Category
URN: urn:nbn:se:uu:diva-47208OAI: oai:DiVA.org:uu-47208DiVA: diva2:75115
Available from: 2007-04-03 Created: 2007-04-03 Last updated: 2013-04-22Bibliographically approved

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Koyi, Hemin
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