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Downward host rock transport and the formation of rim monoclines during the emplacement of Cordilleran batholiths

Published online by Cambridge University Press:  11 January 2017

Scott R. Paterson  and
David W. Farris
Scott R. Paterson
Affiliation:
Department of Earth Sciences, University of Southern California, Los Angeles, USA, e-mail: [email protected]
David W. Farris
Affiliation:
Department of Earth Sciences, University of Southern California, Los Angeles, USA, e-mail: [email protected]
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Abstract

The mechanisms by which Cordilleran plutons are emplaced vary widely. However, the present authors have examined a series of plutons ranging from 2-35 km emplacement depth that have many common features, which suggest that downward transport of host rock is the most important mechanism during magma ascent and pluton emplacement. Many of these Cordilleran plutons preserve gently dipping, unfaulted roofs attached to steep walls bordered by narrow ductile aureoles. Flat lying roof strata commonly roll over into steeply dipping rim monoclines and anticlines that young towards and follow the pluton margin. Field observations suggest that such rim monoclines and anticlines formed due to gravitationally driven roof collapse and channel flow along margins. In the examples in this paper, pluton walls are often comprised of narrow steeply dipping ductile aureoles in which the intensity of strain increases downward. Aureole ductile strains are insufficient to account for the volume of magma emplaced, and are typically <40% of pluton volume. However, when aureole strain is combined with minimum estimates of stoping and host rock rotation during rim monoclines formation, sufficient space can be created. The examples suggest that gravitationally driven downward host rock transport by stoping and rigid rotations along roofs and walls and by focused channel flow by ductile strain along walls are common processes during the rise of Cordilleran plutons, and is one process that contributes to crustal thickening and the growth of crustal roots.

Keywords

Cordilleran arccrustal overturnmagmatismpluton emplacementpluton roofs
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 97 , Issue 4 , 2008 , pp. 397 - 413
Copyright
Copyright © The Royal Society of Edinburgh 2008

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