georefid:2006-011044SEDIS Publication Catalogue
ana.macario@awi.de
http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/2005.2395(01)<gco:CharacterString>Reconstructing ancient deep-sea circulation patterns using the Nd isotopic composition of fossil fish debris</gco:CharacterString>2005-01-01publicationgeorefid:2006-011044doi:10.1130/2005.2395(01)Thomas, Deborah J.University of North Carolina, Department of Geological Sciences, Chapel Hill, NC, United StatesauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyIn: Mora, German (editor), Surge, Donna (editor), Isotopic and elemental tracers of Cenozoic climate change3951-11Understanding the role of thermohaline circulation in past climate depends on proxy-based reconstructions of deep-water mass composition. A growing body of data indicates that the neodymium (Nd) isotopic composition of fossil fish debris found in deep-sea sediments can be used as a gauge of deep-water mass composition. This paper reviews the basis for the use of fossil fish debris Nd isotopic values as a proxy for ancient deep-water mass composition and then presents an example of how ancient thermohaline circulation patterns are reconstructed using records of fish debris Nd from deep-sea sediment cores. Fish teeth and debris acquire enhanced Nd concentrations ( approximately 100s to approximately 1000 ppm) during an early diagenetic reaction at the sediment/water interface. Data published in 2004 by Martin and Scher and presented in this work confirm the assertion that fish teeth and debris record and retain a deep-water mass signal. The widespread stratigraphic and geographic occurrence of fish remains in deep-sea sediments enables construction of much higher-resolution records than previously afforded by Nd isotopic records derived from Fe-Mn crusts. The utility of fish debris Nd isotopic records is apparent when applied to the late Paleocene-early Eocene interval ca. 55 Ma, an interval of time poorly represented in Fe-Mn crust records. Fish debris records from a suite of deep-sea sedimentary sections indicate a mode of thermohaline circulation fundamentally different from the modern-deep waters formed primarily in the Southern Ocean, with no source of deep-water formation in the North Atlantic. This work reinforces the validity and effectiveness of fish debris Nd isotopic records as a tool for reconstructing ancient thermohaline circulation patterns.completedStratigraphyapatiteAtlantic Oceanbiochemistrybonesbottom currentsCenozoicChordatacorescurrentsDeep Sea Drilling Projectdeep-sea environmentDSDP Site 213DSDP Site 401DSDP Site 527DSDP Site 549Eocenegeochemical indicatorsgeochemistryIndian OceanIPODisotope ratiosisotopesLeg 113Leg 143Leg 165Leg 171BLeg 198Leg 22Leg 48Leg 74Leg 80marine environmentmarine sedimentsmetalsNd-144/Nd-143neodymiumOcean Drilling ProgramODP Site 1001ODP Site 1051ODP Site 1209ODP Site 1211ODP Site 690ODP Site 865Pacific Oceanpaleo-oceanographyPaleocenepaleocirculationpaleocurrentsPaleogenephosphatesPiscesrare earthsreconstructionsedimentsSouth AtlanticSoutheast AtlanticSouthern Oceanstable isotopesteethTertiarythermohaline circulationVertebrataworld oceanurn:org.iodp:exp:113urnlargerWorkCitationcampaignurn:org.iodp:exp:143urnlargerWorkCitationcampaignurn:org.iodp:exp:165urnlargerWorkCitationcampaignurn:org.iodp:exp:171BurnlargerWorkCitationcampaignurn:org.iodp:exp:198urnlargerWorkCitationcampaignurn:org.iodp:exp:22urnlargerWorkCitationcampaignurn:org.iodp:exp:48urnlargerWorkCitationcampaignurn:org.iodp:exp:74urnlargerWorkCitationcampaignurn:org.iodp:exp:80urnlargerWorkCitationcampaignurn:org.iodp:exp:22:site:213urnlargerWorkCitationstudyurn:org.iodp:exp:22urnlargerWorkCitationcampaignurn:org.iodp:exp:48:site:401urnlargerWorkCitationstudyurn:org.iodp:exp:48urnlargerWorkCitationcampaignurn:org.iodp:exp:74:site:527urnlargerWorkCitationstudyurn:org.iodp:exp:74urnlargerWorkCitationcampaignurn:org.iodp:exp:80:site:549urnlargerWorkCitationstudyurn:org.iodp:exp:80urnlargerWorkCitationcampaignurn:org.iodp:exp:165:site:1001urnlargerWorkCitationstudyurn:org.iodp:exp:165urnlargerWorkCitationcampaignurn:org.iodp:exp:171B:site:1051urnlargerWorkCitationstudyurn:org.iodp:exp:171BurnlargerWorkCitationcampaignurn:org.iodp:exp:198:site:1209urnlargerWorkCitationstudyurn:org.iodp:exp:198urnlargerWorkCitationcampaignurn:org.iodp:exp:198:site:1211urnlargerWorkCitationstudyurn:org.iodp:exp:198urnlargerWorkCitationcampaignurn:org.iodp:exp:113:site:690urnlargerWorkCitationstudyurn:org.iodp:exp:113urnlargerWorkCitationcampaignurn:org.iodp:exp:143:site:865urnlargerWorkCitationstudyurn:org.iodp:exp:143urnlargerWorkCitationcampaignEnglishgeoscientificInformation-180.0000180.0000-90.000075.0000Atlantic OceanIndian OceanSouthern Ocean