Dobson, DP;
Thomas, R;
Mitchell, T;
(2018)
Diffusion Profiles Around Quartz Clasts as Indicators of the Thermal History of Pseudotachylytes.
Geochemistry, Geophysics, Geosystems
, 19
(11)
pp. 4329-4341.
10.1029/2018GC007660.
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Abstract
Pseudotachylytes are generated by the cooling and solidification of frictional melt produced along a fault surface during seismic slip. Pseudotachylytes can, therefore, provide important constraints on thermal histories of faults during coseismic slip: survivor clast mineralogies and quenched crystallite morphologies have previously been used to constrain the peak temperatures during slip. Here we show that silicon‐diffusion gradients are preserved around quartz survivor clasts and that these can be used to constrain the immediate cooling histories of pseudotachylytes after the cessation of slip. The variation of diffusion length with position in pseudotachylyte veins can be well reproduced by combining simple thermal history models with Arrhenius parameters for diffusion of appropriate magma compositions.
| Type: | Article |
|---|---|
| Title: | Diffusion Profiles Around Quartz Clasts as Indicators of the Thermal History of Pseudotachylytes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2018GC007660 |
| Publisher version: | https://doi.org/10.1029/2018GC007660 |
| Language: | English |
| Additional information: | ©2018. The Authors. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | pseudotachylite, thermal history, diffusion, fault rupture |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10059003 |
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