Comparison of thermal modeling, microstructural analysis, and T i‐in‐quartz thermobarometry to constrain the thermal history of a cooling pluton during deformation in the M ount A bbot Q uadrangle, CA

Granitic plutons commonly preserve evidence for jointing, faulting, and ductile fabric development during cooling. Constraining the spatial variation and temporal evolution of temperature during this deformation could facilitate an integrated analysis of heterogeneous deformation over multiple lengt...

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Veröffentlicht in:Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2017-03, Vol.18 (3), p.1270-1297
Hauptverfasser: Nevitt, Johanna M., Warren, Jessica M., Kidder, Steven, Pollard, David D.
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Sprache:eng
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Zusammenfassung:Granitic plutons commonly preserve evidence for jointing, faulting, and ductile fabric development during cooling. Constraining the spatial variation and temporal evolution of temperature during this deformation could facilitate an integrated analysis of heterogeneous deformation over multiple length‐scales through time. Here, we constrain the evolving temperature of the Lake Edison granodiorite within the Mount Abbot Quadrangle (central Sierra Nevada, CA) during late Cretaceous deformation by combining microstructural analysis, titanium‐in‐quartz thermobarometry (TitaniQ), and thermal modeling. Microstructural and TitaniQ analyses were applied to 12 samples collected throughout the pluton, representative of either the penetrative “regional” fabric or the locally strong “fault‐related” fabric. Overprinting textures and mineral assemblages indicate the temperature decreased from 400–500°C to
ISSN:1525-2027
1525-2027
DOI:10.1002/2016GC006655