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Sub-lithospheric small-scale convection—a mechanism for collision zone magmatism

Kaislaniemi, L.; van Hunen, J.; Allen, M.B.; Neill, I.

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Authors

L. Kaislaniemi

I. Neill



Abstract

We studied the effect of increased water content on the dynamics of the lithosphere-asthenosphere boundary in a postsubduction setting. Results from numerical mantle convection models show that the resultant decrease in mantle viscosity and the peridotite solidus produce small-scale convection at the lithosphere-asthenosphere boundary and magmatism that follows the spatially and temporally scattered style and volumes typical for collision magmatism, such as the late Cenozoic volcanism of the Turkish-Iranian Plateau. An inherent feature in small-scale convection is its chaotic nature that can lead to temporally isolated volcanic centers tens of millions of years after initial continental collision, without evident tectonic cause. We also conclude that water input into the upper mantle during and after subduction under the circum-Mediterranean area and the Tibetan Plateau can account for the observed magmatism in these areas. Only fractions (200–600 ppm) of the water input need to be retained after subduction to induce small-scale convection and magmatism on the scale of those observed from the Turkish-Iranian Plateau.

Citation

Kaislaniemi, L., van Hunen, J., Allen, M., & Neill, I. (2014). Sub-lithospheric small-scale convection—a mechanism for collision zone magmatism. Geology, 42(4), 291-294. https://doi.org/10.1130/g35193.1

Journal Article Type Article
Acceptance Date Jan 10, 2014
Online Publication Date Feb 10, 2014
Publication Date Apr 1, 2014
Deposit Date Feb 5, 2014
Publicly Available Date Mar 29, 2024
Journal Geology
Print ISSN 0091-7613
Electronic ISSN 1943-2682
Publisher Geological Society of America
Peer Reviewed Peer Reviewed
Volume 42
Issue 4
Pages 291-294
DOI https://doi.org/10.1130/g35193.1

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