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Geology of the Ashe Formation between Fries and Galax, VirginiaTso, Jonathan Lee January 1987 (has links)
Field mapping, structural analysis, and mineral equilibria of rocks between Fries and Galax, Virginia provide information on the tectonic and metamorphic history of the Ashe Formation, a series of late Precambrian gneisses, pelitic schists and amphibolites, and the underlying Cranberry Gneiss. The dominant penetrative foliation of the rocks is composed of an early S₁ foliation that is crenulated and transposed by a later S₂ foliation which strikes N 50° E and dips SE. Metamorphic porphyroblast growth of biotite, garnet, staurolite, and kyanite followed penetrative foliation development, with metamorphic grade increasing stratigraphically upward to form inverted isograds. Thrust faulting along the Fries Fault caused extensive mylonitization of the Cranberry Gneiss and offset of the metamorphic isograds. Textural evidence indicates that mylonitization is the greatest in rocks at the Fries Fault trace, and decreases upward through the Cranberry-Ashe contact. No textural evidence of an additional episode of faulting at the AsheCranberry contact was observed, based on lack of a second episode of mylonite, relatively good preservation of sedimentary clasts in the Ashe, and similarity of metamorphic grade.
Mineral equilibria show systematic trends from chlorite-biotite grade to staurolite-kyanite grade. Muscovite compositions show an increase in paragonite component and decrease in celadonite component. Chlorite, biotite, garnet, and staurolite show a systematic increase in Mg/(Mg+ Fe) toward higher grade. AFM topologies indicate that these compositional trends may be explained a series of continuous reactions ( chl + mu=bi + q + V followed by chl + mu + q=gt + bi + V) and discontinuous reactions (gt + chl + mu= st + bi + V followed by st + chl + mu= ky + bi + V). Temperatures inferred from garnet-biotite equilibria are approximately 550 to 600° C in the staurolite zone, with pressures estimated from various equilibria to be between 4.5-7 kb. The inversion of the isograds is interpreted as resulting from overthrusting of the Ashe metasediments during the Paleozoic.
The above information can also be applied to the deformation of the Gossan Lead massive sulfide. Structural data from the Bumbarger mine pit indicates that the massive sulfide underwent the same sequence of structural events as the surrounding rocks. During D₂, shearing of gneisses and schists in a matrix of ductile pyrrhotite caused isoclinal folding, fracture, and rotation of the metasediments while preserving the gross sedimentary layering. This information confirms synsedimentary models of the formation of the Gossan Lead. / Ph. D.
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We don't want them in our schools: Black School Equality, Desegregation, and Massive Resistance in Southwest Virginia, 1920s-1960sDean, Amanda Brooke 23 May 2023 (has links)
This project examines the activism of Black parents, students, and citizens who fought to obtain school equality and desegregation from the 1920s until the 1960s in southwest Virginia and consequently the resistance from White residents and officials. Resistance to the status quo of inequality between Black and White schools in Pulaski County, Virginia began as early as the 1920s. This activism continued through the 1930s and 1940s, with it finally leading NAACP attorneys Oliver Hill and Spottswood Robinson collaborating with Pulaski citizens in 1948 to file a discrimination lawsuit in the case Corbin v. School Board of Pulaski County. The activism did not end here as once the Supreme Court ruled in Brown v. Board of Education that segregated schools were unconstitutional, Black residents in southwest Virginia localities such as Floyd, Galax, Grayson, and Pulaski worked together with NAACP attorney Reuben Lawson to file multiple lawsuits so Black students could attend White schools. Many of these lawsuits faced staunch resistance from White residents of these localities, even with the threat of closing schools due to Virginia's policy of Massive Resistance. I argue that looking at localities such as Pulaski, Floyd, Galax, and Grayson helps situate southwest Virginia into the larger context of Virginia history in terms of examining resistance, fighting for equality, and pushing desegregation in the area during the middle of the twentieth century. Black citizens in the western part of Virginia faced resistance from the White citizens, but they persevered with their activism in the courts and hometowns which ultimately contributed to the dismantling of segregated schools in Virginia. They pushed for equality within segregation and then for desegregation in the middle decades of the twentieth century.
Examining the historiography of school equality and desegregation in Virginia demonstrates that there is an overgeneralization about the resistance which occurred in the western half of the state. Historians argue that the eastern part of the state saw more modes of resistance, especially Massive Resistance, due to the higher population of Black residents. On the other hand, they ignore the western part as they believe the same resistance did not occur due to a lower population of Black residents. I reject these notions as Massive Resistance found its way into southwest Virginia through either the threat of or action of closing schools. I have dug more deeply into the sources, such as trial transcripts, legal correspondence, school board records, petitions, court cases, testimony, newspapers, and oral histories to understand the avenues Black residents in southwest Virginia used to fight inequality and segregation. / Master of Arts / This project examines the activism of Black parents, students, and citizens who fought to obtain school equality and desegregation from the 1920s until the 1960s in southwest Virginia and consequently the resistance from White residents and officials. Resistance to the status quo of inequality between Black and White schools in Pulaski County, Virginia began as early as the 1920s. This activism continued through the 1930s and 1940s, with it finally leading NAACP attorneys Oliver Hill and Spottswood Robinson collaborating with Pulaski citizens in 1948 to file a discrimination lawsuit in the case Corbin v. School Board of Pulaski County. The activism did not end here as once the Supreme Court ruled in Brown v. Board of Education that segregated schools were unconstitutional, Black residents in southwest Virginia localities such as Floyd, Galax, Grayson, and Pulaski worked together with NAACP attorney Reuben Lawson to file multiple lawsuits so Black students could attend White schools. Many of these lawsuits faced staunch resistance from White residents of these localities, even with the threat of closing schools due to Virginia's policy of Massive Resistance. I argue that looking at localities such as Pulaski, Floyd, Galax, and Grayson helps situate southwest Virginia into the larger context of Virginia history in terms of examining resistance, fighting for equality, and pushing desegregation in the area during the middle of the twentieth century. Black citizens in the western part of Virginia faced resistance from the White citizens, but they persevered with their activism in the courts and hometowns which ultimately contributed to the dismantling of segregated schools in Virginia. They pushed for equality within segregation and then for desegregation in the middle decades of the twentieth century.
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