Infiltration of meteoric fluids in an extensional detachment shear zone (Kettle dome, WA, USA): How quartz dynamic recrystallization relates to fluid-rock interaction

Fluid–Rock Interaction and Strain Localization in the Picacho Mountains Detachment Shear Zone, Arizona, USA

“…For the three minerals analyzed, oxygen isotope values fall within a narrow 2‰ range, with 10.2‰ < δ 18 O Qtz < 11.9‰, 4.1‰ < δ 18 O Bt < 5.7‰, and 5.3‰ < δ 18 O Hbl < 7.0‰, similar to values reported by Kerrich and Rehrig (). Such values are somewhat depleted compared to typical metamorphic rock compositions (Taylor & Sheppard, ), and are similar to δ 18 O values reported for other MCCs (Holk & Taylor, ; Holk et al, ; Mulch et al, , ; Gébelin et al, , ; Gottardi et al, , ; Quilichini et al, , ). Using the calibrations by Bottinga and Javoy () and the temperatures estimated by geothermometry (Table ), we estimate that the δ 18 O value of the fluid present during fluid–rock exchange ranges from 7.3 to 9.4‰.…”

“…The presence of fluids during deformation in midcrustal shear zones associated with MCCs has long been recognized (Fricke et al, 1992;Gébelin et al, 2011Gébelin et al, , 2014Gottardi et al, 2011Gottardi et al, , 2015Kerrich & Rehrig, 1987;Methner et al, 2015;Mulch et al, 2004Mulch et al, , 2007Quilichini et al, 2015Quilichini et al, , 2016Wickham et al, 1993). Some isotopic studies have identified the source of synkinematic fluids as basinal brines (Roddy et al, 1988;Spencer & Welty, 1986), magmatic or metamorphic in origin (Axen, 1992;Kerrich & Rehrig, 1987;Smith et al, 1991Smith et al, , 2008, or mixing of multiple sources (Nesbitt & Muehlenbachs, 1995;Spencer & Welty, 1986).…”

“…Some isotopic studies have identified the source of synkinematic fluids as basinal brines (Roddy et al, 1988;Spencer & Welty, 1986), magmatic or metamorphic in origin (Axen, 1992;Kerrich & Rehrig, 1987;Smith et al, 1991Smith et al, , 2008, or mixing of multiple sources (Nesbitt & Muehlenbachs, 1995;Spencer & Welty, 1986). Other isotopic and field-based studies suggest circulation of surface-derived fluids that penetrate to 10-15-km depths (Fricke et al, 1992;Gébelin et al, 2011Gébelin et al, , 2014Gottardi et al, 2011Gottardi et al, , 2015Kerrich & Rehrig, 1987;Methner et al, 2015;Mulch et al, 2004Mulch et al, , 2007Quilichini et al, 2015Quilichini et al, , 2016Wickham et al, 1993). The mechanism by which surface-derived water is pumped beyond the brittle-ductile transition is conceptually challenged by physiomechanical process (e.g., Connolly & Podladchikov, 2004;Fusseis et al, 2009;Lyubetskaya & Ague, 2009;Menegon et al, 2015;Yardley, 2009).…”

H2O Content Measurement in Phengite by Secondary Ion Mass Spectrometry: A New Set of Reference Materials

“…Thermometric methods are also based on phengite; this includes stable isotope thermometry using the quartz–phengite pair (e.g., Quilichini et al ), or the garnet–phengite exchange thermometer, based on the partition of Fe and Mg between the two minerals (e.g., Green and Hellman ). Pressure conditions can be deduced from the silica content in phengite (Massonne and Schreyer , Massonne and Szpurka ).…”

Introduction to Journal of Structural Geology special issue on “Deformation of the lithosphere. How small structures tell a big story”

“…Renedo et al (2015) reconstruct the microstructural evolution during different stages of exhumation of ultrahigh-pressure quartzofeldspathic gneiss and associated coesite-bearing eclogite (Western Gneiss Region, Norway) based on an EBSD texture analysis of omphacite and quartz and Ti-in-quartz thermobarometry. Quilichini et al (2015) highlight the interplay between meteoric fluid flow and deformation in quartzite-dominated lithologies during the evolution of ductile shear zone (Kettle detachment system, Washington, USA), using preserved microstructural characteristics and isotopic composition of quartz and synkinematic muscovite.…”