{"NOAAStudyId":"22254","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2017-06-21","dataPublisher":"NOAA","dataType":"PALEOCEANOGRAPHY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-22254.xml","doi":null,"earliestYearBP":null,"earliestYearCE":null,"entryId":"noaa-ocean-22254","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"1357529"}],"investigators":"Du, J.; Haley, B.A.; Mix, A.C.","mostRecentYearBP":null,"mostRecentYearCE":null,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/22254","originalSource":null,"publication":[{"abstract":"The isotopic composition of neodymium (eNd) extracted from sedimentary Fe–Mn oxyhydroxide offers potential for reconstructing paleo-circulation, but its application depends on extraction methodology and the mechanisms that relate authigenic eNd to bottom water. Here we test methods to extract authigenic eNd from Gulf of Alaska (GOA) sediments and assess sources of leachate Nd, including potential contamination from trace dispersed volcanic ash. We show that one dominant phase is extracted via leaching of core-top sediments. Major and trace element geochemistry demonstrate that this phase is authigenic Fe–Mn oxyhydroxide. Contamination of leachate (authigenic) Nd from detrital sources is insignificant (<1%); our empirical results are consistent with established kinetic mineral dissolution rates and theory. Contamination of extracted eNd from leaching of volcanic ash is below analytical uncertainty. However, the eNd of core-top leachates in the GOA is consistently more radiogenic than bottom water. We infer that authigenic phases record pore water eNd, and the relationships of eNd among bottom waters, pore waters, authigenic phases and detrital sediments are primarily governed by the exposure time of bottom water to sea-floor sediments, rate of exchange across the sediment-water interface and the reactivity and composition of detrital sediments. We show that this conceptual model is applicable on the Pacific basin scale and provide a new framework to understand the role of authigenic phases in both modern and paleo-applications, including the use of authigenic eNd as a paleo-circulation tracer.","author":{"name":"Du, Jianghui, Brian A. Haley, and Alan C. Mix"},"citation":"Du, Jianghui, Brian A. Haley, and Alan C. Mix. 2016. Neodymium isotopes in authigenic phases, bottom waters and detrital sediments in the Gulf of Alaska and their implications for paleo-circulation reconstruction. Geochimica et Cosmochimica Acta, 193, 14-35. doi: 10.1016/j.gca.2016.08.005","edition":null,"identifier":{"id":"10.1016/j.gca.2016.08.005","type":"doi","url":"http://dx.doi.org/10.1016/j.gca.2016.08.005"},"issue":null,"journal":"Geochimica et Cosmochimica Acta","pages":"14-35","pubRank":"1","pubYear":2016,"reportNumber":null,"title":"Neodymium isotopes in authigenic phases, bottom waters and detrital sediments in the Gulf of Alaska and their implications for paleo-circulation reconstruction","type":"publication","volume":"193"}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"57252","geo":{"geoType":"Feature","geometry":{"coordinates":["46.3","60.66","-153.95","-117.43"],"type":"POLYGON"},"properties":{"easternmostLongitude":"-117.43","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"60.66","southernmostLatitude":"46.3","westernmostLongitude":"-153.95"}},"locationName":"Ocean>Pacific Ocean>North Pacific Ocean","mappable":"N","paleoData":[{"NOAADataTableId":"33344","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleocean>geochemistry","earth science>paleoclimate>paleocean>radiogenic isotope"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/du2016/du2016.txt","linkText":"Geochemistry and Radiogenic Isotope Data","urlDescription":"NOAA Template File","variables":[{"cvAdditionalInfo":"Most of the samples are from sediment cores in the Gulf of Alaska but 4 of them are volcanic ash samples collected on land in 4 cities of the Washington State US after the 1980 Mt St. Helens eruption.","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>sample identification"},{"cvAdditionalInfo":"\"Marine sediment samples were collected using piston core ',' gravity core or multicore. Landfall volcanic ash samples were collected by hand. for the other type of cores it starts from the begining of the actually retrieved sediments.\"","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>notes"},{"cvAdditionalInfo":"\"Experiment code; Samples were freezed dried first and rinsed with ultrapure water three times before being leached using an acetic acid (abbreviated as AA) reagent or a hydroxylamine hydrochloride (abbreviated as HH) reagent. The AA reagent stock was made of 3.33 M AA buffered by Na-acetate to pH˜4. The HH reagent stock was made of 0.053 M HH in 2.62 M AA and buffered  to pH˜4 by NaOH. In these leaching experiments, reagent concentration and leaching duration were varied. In experiments AA1 to AA3, the reagent concentration was fixed at 10% v/v of the stock but the leaching duration increased from 3 to 6 and 18 hour. In experiments HH1 to HH6, the leaching duration was fixed at 0.5 hour but the reagent concenetration increased from 5% to 10%, 20%, 30%, 40% and 50% v/v of the stock. In experiments HH7-HH11, the reagent concentration was fixed at 50% v/v of the stock but the leaching duration increased from 1 to 3, 6, 24 and 48 hours. Details see Du, Jianghui, Brian A. Haley, and Alan C. Mix. \"\"Neodymium isotopes in authigenic phases, bottom waters and detrital sediments in the Gulf of Alaska and their implications for paleo-circulation reconstruction.\"\" Geochimica et Cosmochimica Acta 193 (2016): 14-35. HH4 is the final choice\"","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>notes"},{"cvAdditionalInfo":"\"For multicores the zero depth starts from the sediment water interface ',' for the other type of cores it starts from the begining of the actually retrieved sediments\"","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth>depth at sample end"},{"cvAdditionalInfo":"\"For multicores the zero depth starts from the sediment water interface ',' for the other type of cores it starts from the begining of the actually retrieved sediments\"","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","cvWhat":"depth variable>depth>depth at sample start"},{"cvAdditionalInfo":"South negative","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree north","cvWhat":"sampling metadata>latitude"},{"cvAdditionalInfo":"West negative","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"degree east","cvWhat":"sampling metadata>longitude"},{"cvAdditionalInfo":"Positive below seafloor","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"sampling metadata>collection water depth"},{"cvAdditionalInfo":"weight of freeze dried sample; approximately 1 gram","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"gram","cvWhat":"physical property>weight"},{"cvAdditionalInfo":"volume of the diluted reagent; determined such that the solution vs solid ratio was approximately 8ml vs 1 g","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"milliliter","cvWhat":"physical property>volume"},{"cvAdditionalInfo":"eNd=((143Nd/144Nd)sample/(143Nd/144Nd)CHUR-1)*1E4","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"multiple collector inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"epsilon unit","cvWhat":"chemical composition>isotope>isotope ratio>143Nd/144Nd>epsilon neodymium"},{"cvAdditionalInfo":"The 2 sigma external precision was calculated by running an in house standard repeadedly.","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"multiple collector inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>isotope>isotope ratio>87Sr/86Sr"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>aluminum"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>barium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>calcium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>strontium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>iron"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>manganese"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>cobalt"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>copper"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>nickel"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma atomic emission spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>zinc"},{"cvAdditionalInfo":"reported as ng leached from 1 g of 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spectroscopy","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>vanadium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>chromium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>scandium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>uranium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>yttrium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>lanthanum"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>cerium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>neodymium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>samarium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>europium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>gadolinium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>terbium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>dysprosium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>holmium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>erbium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>thulium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>ytterbium"},{"cvAdditionalInfo":"reported as ng leached from 1 g of freeze-dried sample","cvDataType":"PALEOCEANOGRAPHY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":"inductively-coupled plasma mass spectrometry","cvSeasonality":null,"cvShortName":null,"cvUnit":"nanogram per gram","cvWhat":"chemical composition>element or single-element molecule>lutetium"}]}],"dataTableName":"Gulf of Alaska Du2016","dataTableNotes":"The samples reported here were not dated. These samples are mostly core-top samples, with a few late glacial samples and a few marine volcanic ash layers of unknown ages. The multicore core-tops are real sediment-water interface samples and presumabaly modern. The piston and gravity core-tops are of unknow age. The land fall volcanic ash samples were collected after the 1980 Mt St. Helens eruption.","earliestYear":null,"earliestYearBP":null,"earliestYearCE":null,"mostRecentYear":null,"mostRecentYearBP":null,"mostRecentYearCE":null,"species":[],"timeUnit":null}],"siteName":"Gulf of Alaska and Northeast Pacific"}],"studyCode":null,"studyName":"Gulf of Alaska, Northeast Pacific Geochemistry and Radiogenic Isotope Data from Leaching Experiments","studyNotes":"In this study we teste various leaching methods to extract authigenic iron manganese oxyhydroxides for neodymium isotope analysis from sediments in the Gulf of Alaska while avoiding contamination from lithogenic sedimenet components during chemical extractions. Method HH4 as described in the \"Data\" section is the final method of choice. This method was tested on a suite of core-top, down-core and marine ash layer samples from the Gulf of Alaska, as well as land fall volcanic ash samples from Mt St. Helens. We analyzed neodymium and strontium isotopes, major and trace elements, including the Rare Earth Elements, in the leachates and these data are reported here. Measurement precision- epsilon Nd: 0.37; 87Sr/86Sr: .000049; Aluminum,Barium,Calcium,Strontium,Iron,Manganese,Cobalt,Copper,Nickel,Zinc,Potassium,Magnesium,Vanadium,Chromium,Scandium, and Uranium: 5-10%; Yttrium,Lanthanum,Cerium,Praseodym,Neodymium,Samarium,Europium,Gadolinium,Terbium,Dysprosium,Holmium,Erbium,Thulium,Ytterbium,Lutetium: 5%\n     Provided Keywords: neodymium isotopes, authigenic phase, Gulf of Alaska, North Pacific, core-top\n","version":"1.0","xmlId":"20296"}