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A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982

Bergen Open Research Archive

Show simple item record Andersson, Carin eng Jansen, Eystein eng 2004-07-12T09:08:43Z 2004-08-03T12:58:21Z 2004-08-26T11:57:54Z 2004-07-12T09:08:43Z 2004-08-03T12:58:21Z 2004-08-26T11:57:54Z 2003-03-12
dc.identifier.issn 0883-8305
dc.description.abstract Oxygen and carbon isotope records are presented for the benthic foraminifer Cibicidoides wuellerstorfi from upper middle through lower upper Miocene (11.6–8.2 Ma) sediments recovered at intermediate water depth (1134 m) at Ocean Drilling Program Site 982 on Rockall Plateau. Oxygen isotopic values generally lighter than those for the Holocene indicate significantly warmer intermediate waters and/or less global ice volume during the late middle to early late Miocene than at the present. The most depleted oxygen isotope values occurred at around 10.5 Ma. After this time a long-term increase in d18O suggests a gradual increase in global ice volume and/or cooling of intermediate waters during the late Miocene. Comparison of the intermediate depth benthic foraminiferal carbon isotope record from Site 982 and records from various North Atlantic deep sites shows that intermediate waters were generally better ventilated than deep waters between 11.6 and 9.6 Ma. During this time period, increased ventilation of intermediate waters was linked to cooling or the build up of polar ice caps. The Mi events originally proposed by Miller et al. [1991b] and Wright and Miller [1992] are difficult to identify with certainty in sediments sampled at high resolution (<104 year). Comparison of the highresolution benthic d18O records from ODP Site 982 with the low-resolution benthic d18O record from Monte Gibliscemi (Mediterranean) show that Mi events, if real, may not be of importance as a stratigraphic tool in upper Miocene sedimentary sequences. en
dc.format.extent 453787 bytes en
dc.format.extent 183 bytes en
dc.format.extent 453787 bytes en
dc.format.extent 50007 bytes
dc.format.extent 453787 bytes
dc.format.extent 183 bytes
dc.format.mimetype application/pdf en
dc.format.mimetype text/plain en
dc.language.iso eng eng
dc.publisher American Geophysical Union
dc.rights Copyright 2003 the American Geophysical Union
dc.subject Paleoceanography eng
dc.subject Stable isotopes eng
dc.subject North Atlantic Ocean eng
dc.title A Miocene (8–12 Ma) intermediate water benthic stable isotope record from the northeastern Atlantic, ODP Site 982 en
dc.type Journal article eng
dc.type.version publishedVersion eng
bora.peerreviewed Peer reviewed eng
bora.journalTitle Paleoceanography
bibo.volume 18
bibo.issue 1
bora.cristinID 399372
bibo.number 1013

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