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dc.contributor.authorPope, Michael Cen_US
dc.date.accessioned2014-03-14T21:11:14Z
dc.date.available2014-03-14T21:11:14Z
dc.date.issued1995-12-01en_US
dc.identifier.otheretd-05202008-111414en_US
dc.identifier.urihttp://hdl.handle.net/10919/37846
dc.description.abstractEarly Ordovician Knox Group carbonates consist of meter-scale dolomite cycles deposited on a passive margin. The meter-scale cycles were deposited under warm, semi-arid conditions, under low amplitude sea level fluctuations on a relatively ice-free earth. The overlying Knox unconformity (- 10 m.y. duration), formed by global eustatic sea level fall and tectonic uplift of the subducting margin at the onset of Taconic orogenesis. Middle Ordovician carbonates were deposited on a ramp peripheral to a foredeep in Tennessee. The Middle Ordovician High Bridge Group consists of a 2nd-order supersequence with three 3rd-order sequences (each 30 to 100 m thick), which record a long term change from humid conditions in TST's into more arid conditions during HST's. Peritidal cycles formed under low-amplitude eustatic fluctuations. The late Middle to Late Ordovician carbonates and clastics comprise a 2nd-order supersequence deposited on a ramp peripheral to the Taconic foredeep. The supersequence is composed of four 3rd-order sequences (each 40 to 80 m thick), which contain 11 parasequence sets (2 to 20 m thick). The small sequences are composed of stacked, predominantly subtidal meter-scale cycles (parasequences). Meter-scale subtidal cycles contain facies that suggest they formed under moderate amplitude (20 to 40 m) sea level fluctuations, likely produced by glacio-eustasy. However, peritidal cycles in the HST's indicate they formed under low-amplitude sea level fluctuations, thus suggesting the amplitude of sea level fluctuations decreased during 3rd-order sea level falls. The facies in the supersequence indicate they formed under cool, humid conditions during the 2nd-order TST and became more arid during the 2nd-order HST. The unconformity at the top of the supersequence formed during eustatic sea level drawdown associated with extensive Latest Ordovician glaciation.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartLD5655.V856_1995.P674_drw01b.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw02b.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw02a.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw01c.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw05b.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw03a.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw03b.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw01a.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw04a.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw04b.pdfen_US
dc.relation.haspartLD5655.V856_1995.P674_drw05a.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.subjectdolomite cyclesen_US
dc.subject.lccLD5655.V856 1995.P674en_US
dc.titleHigh Resolution Stratigraphy of Ordovician Carbonates, Kentucky: Evidence for a Greenhouse to Glacial Transitionen_US
dc.typeDissertationen_US
dc.contributor.departmentGeosciencesen_US
thesis.degree.namePhDen_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairRead, James Fredricken_US
dc.contributor.committeememberEriksson, Kenneth A.en_US
dc.contributor.committeememberMcLean, Dewey M.en_US
dc.contributor.committeememberBambach, Richard K.en_US
dc.contributor.committeememberCoruh, Cahiten_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05202008-111414/en_US
dc.date.sdate2008-05-20en_US
dc.date.rdate2008-05-20
dc.date.adate2008-05-20en_US


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