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Book Chapter

Orocline triggered lithospheric delamination

By
Gabriel Gutiérrez-Alonso
Gabriel Gutiérrez-Alonso
Departamento de Geología, Universidad de Salamanca, 33708 Salamanca, Spain
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Javier Fernández-Suárez
Javier Fernández-Suárez
Departamento de Petrología y Geoquímica, Universidad Complutense, 28040 Madrid, Spain
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Arlo B Weil
Arlo B Weil
Department of Geology, Bryn Mawr College, Bryn Mawr, Pennsylvania 19101, USA
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Published:
January 01, 2004

Late- to post-orogenic oroclinal bending in conjunction with thinning of the lithospheric mantle is potentially an important component of the waning stages of plate convergence in collisional orogenies. This paper addresses possible and hitherto unexplored cause-effect relationships between oroclinal bending of an originally linear orogenic belt and lithospheric thinning and delamination based on an example from the Western European Variscan Belt. We suggest that late- to post-orogenic bending of the lithosphere around a vertical axis may cause thickening and eventual detachment of the lithospheric root of orogenic belts such as the Western European Variscan Belt. The proposed hypothesis is consistent with the chronology of tectonic, metamorphic, magmatic, and hydrothermal events recorded in the Western European Variscan Belt. Moreover, this hypothesis could explain the preservation of the lithospheric root in linear orogens, like the Urals, which lack significant modification following the initial phase of “orthogonal” lithospheric thickening.

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GSA Special Papers

Orogenic curvature: Integrating paleomagnetic and structural analyses

Aviva J. Sussman
Aviva J. Sussman
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Arlo B. Weil
Arlo B. Weil
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Geological Society of America
Volume
383
ISBN print:
9780813723839
Publication date:
January 01, 2004

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