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• W2527522399 abstract "Structures within and around plutons provide crucial data to analyze the deformational history in orogenic belts. However, these structures are often difficult to interpret in part because of insufficient exposures, lack of quantitative measurements of strains within and around plutons, and the need for quantitative theoretical models to explain these strains and structures. This dissertation tackles these problems by two approaches: (1) a field study of the Merrimac pluton, northern Sierra Nevada, which addresses structural, strain, and composition measurements, and (2) three-dimensional computer modeling of pluton emplacement and tectonic deformation. As a result of this study, insights were produced on (1) origins of strains and structures around plutons in general and deformation history of the Merrimac pluton in specific; (2) probable timing of Jurassic subduction in northern Sierra Nevada; and (3) computer graphics techniques useful in modeling structures in orogenic belts.Image analysis techniques were used to determine modal compositions of 52 samples within the Merrimac pluton. The integrated analysis of this composition data with foliation patterns within the pluton indicates that, contrary to previously believed, the Merrimac pluton is composed of two independent bodies; the northern pluton was emplaced after the intrusion of the southern pluton; and both plutons were either obliquely emplaced or tilted 30 degrees.This dissertation reports strain measurements associated with pluton emplacement in northern Sierra Nevada. These measurements indicate that strains within the Merrimac pluton are due to igneous rather than tectonic processes, which strengthen the hypothesis that the Merrimac was emplaced after the formation of regional structures and melanges. Therefore, the age of the Merrimac pluton (142 $pm$ 3 Ma) places an upper limit on the age of the Jurassic subduction in northern Sierra Nevada.In addition, this dissertation reports the occurrence of constrictional strains at ends of a pluton. These field data constrain 3-D numerical simulation of pluton emplacement in a regional strain field. This simulation to date has demonstrated that (1) computer graphics techniques, such as interactive modeling and 3-D rendering, is not only convenient but often required to visualize and interpret complex geological simulations, and (2) structures previously believed to be produced by syn-tectonic pluton expansion under non-coaxial kinematic schemes can also be produced by coaxial tectonic deformation." @default.
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• W2527522399 date "1991-05-01" @default.
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• W2527522399 title "Kinematics and strain analysis of pluton emplacement: field and three-dimensional computer model studies" @default.
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