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dc.contributor.authorWilson, John Roberten_US
dc.date.accessioned2014-03-14T20:46:13Z
dc.date.available2014-03-14T20:46:13Z
dc.date.issued2001-09-28en_US
dc.identifier.otheretd-10012001-145430en_US
dc.identifier.urihttp://hdl.handle.net/10919/35248
dc.description.abstractThe rocks of the Appalachian orogen are world-class examples of collisional and extensional tectonics, where multiple episodes of mountain building and rifting from the pre-Cambrian to the present are preserved in the geologic record. These orogenic events produced plutonic rocks, which can be used as probes of the thermal state of the source region. SIMS (secondary ion mass spectrometry) U/Pb ages of zircons were obtained for ten plutons (Leatherwood, Rich Acres, Melrose, Buckingham, Diana Mills, Columbia, Poore Creek, Green Springs, Lahore and Ellisville) within Virginia. These plutons are distinct chemically, isotopically, and show an age distribution where felsic rocks are approximately 440 Ma, and Mafic rocks are approximately 430 Ma. Initial strontium isotopic ratios and bulk geochemical analyses were also performed. These analyses show the bimodal nature of magmatism within this region. In order to facilitate management of geologic data, including radiometric ages, strontium isotope initial ratios and major element geochemistry, a GIS based approach has been developed. Geospatially references sample locations, and associated attribute data allow for analysis of the data, and an assessment of the accuracy of field locations of plutons at both regional and local scales. The GIS based assessment of plutons also allows for the incorporation of other multidisciplinary databases to enhance analysis of regional and local geologic processes. Extending such coverage to the central Appalachians (distribution of lithotectonic belts, plutons, and their ages and compositions) will enable a rapid assessment of tectonic models.en_US
dc.publisherVirginia Techen_US
dc.relation.haspart1JRWthesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectGISen_US
dc.subjectCentral Appalachiansen_US
dc.subjectPlutonsen_US
dc.subjectU/Pb Agesen_US
dc.subjectDatabasesen_US
dc.titleU/Pb Zircon Ages of Plutons from the Central Appalachians and GIS-Based Assessment of Plutons with Comments on Their Regional Tectonic Significanceen_US
dc.typeThesisen_US
dc.contributor.departmentGeological Sciencesen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineGeological Sciencesen_US
dc.contributor.committeechairSinha, A. Krishnaen_US
dc.contributor.committeememberBeard, James S.en_US
dc.contributor.committeememberHenika, William S.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10012001-145430/en_US
dc.date.sdate2001-10-01en_US
dc.date.rdate2002-10-08
dc.date.adate2001-10-08en_US


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