High Resolution Stratigraphy of Ordovician Carbonates, Kentucky: Evidence for a Greenhouse to Glacial Transition

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dc.contributor.authorPope, Michael C.en
dc.contributor.committeechairRead, James Fredricken
dc.contributor.committeememberEriksson, Kenneth A.en
dc.contributor.committeememberMcLean, Dewey M.en
dc.contributor.committeememberBambach, Richard K.en
dc.contributor.committeememberCoruh, Cahiten
dc.contributor.departmentGeosciencesen
dc.date.accessioned2014-03-14T21:11:14Zen
dc.date.adate2008-05-20en
dc.date.available2014-03-14T21:11:14Zen
dc.date.issued1995-12-01en
dc.date.rdate2008-05-20en
dc.date.sdate2008-05-20en
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
dc.description.degreePh. D.en
dc.format.extentxiii, 194 leaves (6 folded)en
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-05202008-111414en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05202008-111414/en
dc.identifier.urihttp://hdl.handle.net/10919/37846en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1995.P674_drw01b.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw02b.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw02a.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw01c.pdfen
dc.relation.haspartLD5655.V856_1995.P674.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw05b.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw03a.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw03b.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw01a.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw04a.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw04b.pdfen
dc.relation.haspartLD5655.V856_1995.P674_drw05a.pdfen
dc.relation.isformatofOCLC# 34929226en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectdolomite cyclesen
dc.subject.lccLD5655.V856 1995.P674en
dc.titleHigh Resolution Stratigraphy of Ordovician Carbonates, Kentucky: Evidence for a Greenhouse to Glacial Transitionen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineGeosciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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