%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Quilichini, A.
%A Siebenaller, Luc
%A Nachlas, W. O.
%A Teyssier, C.
%A Vennemann, T. W.
%A Heizler, M. T.
%A Mulch, A.
%T Infiltration of meteoric fluids in an extensional detachment shear zone (Kettle dome, WA, USA) : how quartz dynamic recrystallization relates to fluid-rock interaction
%B Deformation of the lithosphere : how small structures tell a big story
%D 2015
%E Sintubin, M.
%E De Bresser, H.
%E Drury, M.
%E Prior, D.
%E Wenk, H.R.
%L fdi:010063995
%G ENG
%J Journal of Structural Geology
%@ 0191-8141
%K Meteoric water ; Hydrogen isotopes ; Oxygen isotopes ; Dynamic recrystallization ; Kettle dome ; Extensional detachment
%K ETATS UNIS
%M ISI:000350533100006
%N no spécial
%P 71-85
%R 10.1016/j.jsg.2014.11.008
%U https://www.documentation.ird.fr/hor/fdi:010063995
%> https://www.documentation.ird.fr/intranet/publi/2015/04/010063995.pdf
%V 71
%W Horizon (IRD)
%X We document the interplay between meteoric fluid flow and deformation processes in quartzite-dominated lithologies within a ductile shear zone in the footwall of a Cordilleran extensional fault (Kettle detachment system, Washington, USA). Across 150 m of shear zone section, hydrogen isotope ratios (delta D) from synkinematic muscovite fish are constant (delta D similar to -130 parts per thousand) and consistent with a meteoric fluid source. Quartz-muscovite oxygen isotope thermometry indicates equilibrium fractionation temperatures of similar to 365 +/- 30 degrees C in the lower part of the section, where grain-scale quartz deformation was dominated by grain boundary migration recrystallization. In the upper part of the section, muscovite shows increasing intragrain compositional zoning, and quartz microstructures reflect bulging reaystallization, solution-precipitation, and microcracking that developed during progressive cooling and exhumation. The preserved microstructural characteristics and hydrogen isotope fingerprints of meteoric fluids developed over a short time interval as indicated by consistent mica Ar-40/Ar-39 ages ranging between 51 and 50 Ma over the entire section. Pervasive fluid flow became increasingly channelized during detachment activity, leading to microstructural heterogeneity and large shifts in quartz delta O-18 values on a meter scale. Ductile deformation ended when brittle motion on the detachment fault rapidly exhumed the mylonitic footwall.
%$ 060 ; 064