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dc.contributor.authorHarris, Robert Scott
dc.date.accessioned2014-03-03T21:01:20Z
dc.date.available2014-03-03T21:01:20Z
dc.date.issued2003-08
dc.identifier.otherharris_robert_s_200308_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/harris_robert_s_200308_ms
dc.identifier.urihttp://hdl.handle.net/10724/21059
dc.description.abstractModeling demonstrates that the Late Eocene Chesapeake Bay impact would have been capable of depositing ejecta in east-central Georgia with thicknesses exceeding thirty centimeters. A coarse sand layer at the base of the Upper Eocene Dry Branch Formation was examined for shocked minerals. Universal stage measurements demonstrate that planar fabrics in some fine to medium sand-size quartz grains are parallel to planes commonly exploited by planar deformation features (PDF’s) in shocked quartz. Possible PDF’s are observed parallel to {10-13}, {10-11}, {10-12}, {11-22} and {51-61}. Petrographic identification of shocked quartz is supported by line broadening in X-ray diffraction experiments. Other impact ejecta recognized include possible ballen quartz, maskelynite, and reidite-bearing zircon grains. The layer is correlative with an unusual diamictite that contains goethite spherules similar to altered microkrystites. It may represent an impact-generated debris flow. These discoveries suggest that the Chesapeake Bay impact horizon is preserved in Georgia. The horizon also should be the source stratum for Georgia tektites.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectChesapeake Bay impact
dc.subjectUpper Eocene
dc.subjectShocked quartz,Impact shock
dc.subjectShocked zircon
dc.subjectImpact
dc.subjectImpact ejecta
dc.subjectNorthAmerican tektites
dc.subjectTektites
dc.subjectGeorgiaites
dc.subjectGeorgia Tektites
dc.subjectPlanar deformation features
dc.subjectPDF\'s
dc.subjectGeorgia
dc.subjectGeology
dc.subjectCoastal Plain,Stratigraphy
dc.subjectIm
dc.titleEvidence for impact-generated deposition on the late eocene shores of Georgia
dc.typeThesis
dc.description.degreeMS
dc.description.departmentGeology
dc.description.majorGeology
dc.description.advisorMichael F. Roden
dc.description.committeeMichael F. Roden
dc.description.committeeSteven M. Holland
dc.description.committeePaul A. Schroeder


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