Mesozoic deformation and pluton emplacement in the northern Luning-Fencemaker fold-and-thrust belt : new evidence from the Bloody Run Hills, Nevada
Ciavarella, Veronica Charlotte
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The Bloody Run Hills (BRH), located in the northern Luning-Fencemaker foldand- thrust belt of north-central Nevada, consist of metamorphosed and deformed sedimentary rocks that were deposited in a Triassic back-arc basin, and two Cretaceous granodiorite stocks. This study was conducted to describe the stratigraphy and deformation present in the BRH, correlate these findings with nearby areas in northern Nevada, and describe contact metamorphism and other emplacement-related features resulting from intrusion of Cretaceous plutons present in the BRH, in order to ultimately determine the mechanisms of emplacement for these plutons. The BRH were affected by one major phase of deformation, similar to a major phase of deformation recorded throughout the basinal terrane, followed by two minor phases of deformation, the last of which occurred broadly synchronous with intrusion of mid-Cretaceous plutons. Relations between Cretaceous plutons and wall rocks in the BRH indicate that pluton emplacement occurred mainly by stoping and/or roof uplift.