Disclosing the temperature of columnar jointing in lavas

Lamur, Anthony and Lavallée, Yan and Iddon, Fiona E. and Hornby, Adrian J. and Kendrick, Jackie E. and von Aulock, Felix W. and Wadsworth, Fabian B. (2018) Disclosing the temperature of columnar jointing in lavas. Nature Communications, 9 (1). ISSN 2041-1723 DOI https://doi.org/10.1038/s41467-018-03842-4

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Columnar joints form by cracking during cooling-induced contraction of lava, allowing hydrothermal fluid circulation. A lack of direct observations of their formation has led to ambiguity about the temperature window of jointing and its impact on fluid flow. Here we develop a novel thermo-mechanical experiment to disclose the temperature of columnar jointing in lavas. Using basalts from Eyjafjallajökull volcano (Iceland) we show that contraction during cooling induces stress build-up below the solidus temperature (980 °C), resulting in localised macroscopic failure between 890 and 840 °C. This temperature window for incipient columnar jointing is supported by modelling informed by mechanical testing and thermal expansivity measurements. We demonstrate that columnar jointing takes place well within the solid state of volcanic rocks, and is followed by a nonlinear increase in system permeability of <9 orders of magnitude during cooling. Columnar jointing may promote advective cooling in magmatic-hydrothermal environments and fluid loss during geothermal drilling and thermal stimulation.

Item Type: Article
Uncontrolled Keywords: NILAREP; IA74
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
07 - Gold Open Access
Journal or Publication Title: Nature Communications
Volume: 9
Identification Number: https://doi.org/10.1038/s41467-018-03842-4
Depositing User: Sarah Humbert
Date Deposited: 12 Apr 2018 17:26
Last Modified: 12 Apr 2018 17:26
URI: http://eprints.esc.cam.ac.uk/id/eprint/4252

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