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- W7352413 abstract "Synkinematic fluids that accompanied Mesozoic (D2) deformation in the Granite Wash Mountains, eastern Maria fold and thrust belt, had profound effects on the metamorphic mineralogy and deformation mechanisms of Paleozoic metsedimentary rocks. The D2 thrusts are discrete brittle faults that commonly bound highly sheared, ductilely deformed rocks. These low-angle faults cross cut a vertical section of Paleozoic and Mesozoic supracrustal rocks that were multiply repeated and upturned by earlier Mesozoic deformation, D1. Kinematic analysis of a series of these ductile shear zones has confirmed that the dominant sense of motion during thrusting was to the SW, however, some isolated kinematic indicators and indicators along the lowest zone suggest NE-thrusting. Microstructures in samples collected both within D2 ductile shear zones and outside D2 zones show fluids played an important role in D2 deformation. The abundant evidence for fluids along D2 ductile shear zones includes: quartz veins in the Kaibab Fm (a dolomitic marble), zones of metasomatic alteration ( bleached'' zones) within D2 zones, an increase in the abundance of metamorphic minerals within D2 zones, and the presence of synkinematic wollastonite in silicones limestones of the Redwall Fm. The most dramatic and significant effect of synkinematic fluids in on the style ofmore » deformation mechanisms operating during thrusting. Evidence for intracrystalline plastic deformation and rotational recrystallization is not well-developed: instead, microstructures are dominated by migrational recrystallization fabrics. In some samples, quartz grain boundaries have migrated over a preexisting foliation defined by aligned micas, indicating that grain boundaries were highly mobile. Fluid-enhanced grain boundary mobility has allowed internally deformed grains or parts of grains to be consumed rapidly with no or little record of the deformation left behind.« less" @default.
- W7352413 created "2016-06-24" @default.
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- W7352413 date "1993-04-01" @default.
- W7352413 modified "2023-09-26" @default.
- W7352413 title "Evidence for fluid flow in ductile shear zones, Granite Wash Mountains, Maria fold and thrust belt" @default.
- W7352413 hasPublicationYear "1993" @default.
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