NDLI: Granite magma migration and emplacement along thrusts

Content Provider	Springer Nature Link
Author	Ferré, Eric C. Galland, Olivier Montanari, Domenico Kalakay, Thomas J.
Copyright Year	2012
Abstract	This paper investigates the influence exerted by brittle tectonic structures in the emplacement of granite plutons in contractional settings. We address both cases where contractional tectonics and magma intrusion are (1) coeval, to study how active contractional tectonics controls the transport of magma, and (2) diachronous, to study the role of pre-existing structures on the transport of magma. In light of new experimental models, we show that magma can rise along thrusts ramps and flats. This phenomenon occurs for both low-viscosity magma (basalts to andesite) and high-viscosity magma (dry granite). The experimental results also allow the evaluation of the role played by magma viscosity in determining pluton geometries. In addition, a review of literature demonstrates a spatial and causal relationship between granites and thrusts and highlights the geometric control of magma pathways in the pluton final shape. The abundance of subhorizontal and tabular granitic intrusions indicates that the location of inflating granitic sills along thrust flats can be common. We argue that active and pre-existing flats-and-ramps thrusts provide a preferential continuous planar anisotropy susceptible to become a granitic magma migration pathway.
Starting Page	1673
Ending Page	1688
Page Count	16
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	101
Issue Number	7
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-01-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Granite Pluton Thrust Flats-and-ramps Analogue modeling Geophysics/Geodesy Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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