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Petrogenesis and tectonic implications of mafic rocks in the Precambrian core of the Black Hills, South Dakota
(University of Missouri--Columbia, 2007)
, the geologic setting and tectonic events that occurred prior to the collision are still enigmatic. In this investigation major and trace element ICP-OES and INAA data of four suites of amphibolites were used to define at least two distinct tectonic settings...
Composition of magmatic fluids in the Harney Peak granite, Black Hills, South Dakota
(University of Missouri--Columbia, 2013)
Fluid inclusions are potential trapped samples of magmatic fluids, and they therefore provide a way to directly measure the composition of magmatic fluids. Understanding the composition of magmatic fluids is important ...
Unraveling the fluid-present metamorphism of schists from garnet compositions in the Black Hills, South Dakota
(University of Missouri--Columbia, 2012)
Garnets in Proterozoic metapelites in the Black Hills, South Dakota, were analyzed to determine their pressure, temperature and hydrothermal conditions of growth and to elucidate pressure-temperature-time paths of their ...
Structural geology and tectonics of the paleoproterozoic rocks of the Mount Rushmore Quadangle, Black Hills, Souh Dakota
(University of Missouri--Columbia, 2006)
The Paleoproterozoic assembly of Laurentia occurred between ̃1.96 to 1.70 Ga, and continued with the accretion of island arc terranes until about 1.63 Ga. The Black Hills, South Dakota lie along the eastern margin of the ...
Lithium and lithium isotopes in tourmaline as indicators of crystallization processes: a study of San Diego County pegmatites, California
(University of Missouri--Columbia, 2007)
The pegmatites of San Diego County, California, are part of the Mesozoic Peninsular Ranges Batholith of southwestern California and Baja California, Mexico. Three LCT- pegmatites were studied. The pegmatites have texturally, ...
Variation and fractionation of lithium isotopes within single tourmaline crystals in the pegmatites of the Black Hills, SD
([University of Missouri--Columbia], 2014)
Extremely large elongated crystals, attributed to low nucleation rates and rapid growth during fast cooling (Nabelek et al., 2010), are just one example of the intriguing and unusual disequilibrium features found in granitic ...
Fluid inclusion evidence for the nature of fluids associated with recrystallization of quartzites in the EJB contact Aureole, California
(University of Missouri--Columbia, 2009)
The purpose of this study was to look at the control of fluids and fluid composition on recrystallization of quartzites in the Eureka Valley - Joshua Flat - Beer Creek pluton contact aureole (EJB), in the White - Inyo ...