The Caribbean carbonate crash at the middle to late Miocene transition and the establishment of the modern global thermohaline circulation

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dc.contributor.advisorDroxler, Andre W.en_US
dc.creatorRoth, Joy Micheleen_US
dc.date.accessioned2009-06-04T06:27:42Zen_US
dc.date.available2009-06-04T06:27:42Zen_US
dc.date.issued1999en_US
dc.description.abstractThe Caribbean carbonate crash was a time of increased regional carbonate dissolution at the middle to late Miocene transition. It is marked by five dissolution episodes, occurring from 12-10 Ma, characterized by significant reductions in carbonate mass accumulation rates (CO$\sb3$ MAR). We determined carbonate content and CO$\sb3$ MAR for sites 998-1000 over the middle to late Miocene interval. Stable isotope composition of benthic foraminifers is used to track changes in deep water masses. Carbonate mineralogies are determined for the shallow site 1000 (927 m water depth) to detect dissolution of metastable carbonates at sub-thermocline depths. The geochemical changes during the carbonate period are similar to those that occur during the Caribbean Quaternary interglacial stages, times when Antarctic Intermediate Water (AAIW) filled the Caribbean to abyssal depths. The initiation of North Atlantic Deep Water (NADW) production during this period, possibly caused by the partial closing of the Isthmus of Panama and the opening of Pedro Channel (northern Nicaragua Rise), led to reorganization of global thermohaline circulation. The increase of return flow that passes through the Caribbean may have brought corrosive AAIW into the Caribbean, causing dissolution of carbonate sediment at the sea floor.en_US
dc.format.extent135 p.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS GEOL. 1999 ROTHen_US
dc.identifier.citationRoth, Joy Michele. "The Caribbean carbonate crash at the middle to late Miocene transition and the establishment of the modern global thermohaline circulation." (1999) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/17317">https://hdl.handle.net/1911/17317</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/17317en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectGeologyen_US
dc.subjectPhysical oceanographyen_US
dc.subjectGeochemistryen_US
dc.titleThe Caribbean carbonate crash at the middle to late Miocene transition and the establishment of the modern global thermohaline circulationen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US
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