Sub-lithospheric small-scale convection—a mechanism for collision zone magmatism
Kaislaniemi, L.; van Hunen, J.; Allen, M.B.; Neill, I.
Professor Jeroen Van Hunen firstname.lastname@example.org
Professor Mark Allen email@example.com
Head of Department
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.
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 25, 2014|
|Publisher||Geological Society of America|
|Peer Reviewed||Peer Reviewed|
Published Journal Article
Publisher Licence URL
© 2014 Geological Society of America. Gold Open Access: This paper is published under the terms of the CC-BY license.