{"NOAAStudyId":"13828","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":"2013-02-11","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-13828.xml","doi":null,"earliestYearBP":4858000,"earliestYearCE":-4856050,"entryId":"noaa-ocean-13828","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"HOMINID Grant 0218511"}],"investigators":"Feakins, S.J.; Brown, F.H.; deMenocal, P.B.","mostRecentYearBP":60000,"mostRecentYearCE":-58050,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/13828","originalSource":null,"publication":[{"abstract":"We reconstruct a Plio-Pleistocene microscopic tephrostratigraphy for DSDP Site 231 in the Gulf of Aden. Systematic microtephrostratigraphy increases the potential for identifying tephra horizons for regional stratigraphic correlation and age control, as well as providing information about eruptive histories. Microtephra reveal three main pulses of volcanism c. 4.0-3.2 Ma, 2.4 Ma and 1.7-1.3 Ma, corresponding to peaks in volcanic activity recorded in the East African Rift System. Previous studies of DSDP Site 231 have reported six visible tephra horizons (up to 25 cm thick) with geochemical compositions matching East African tuffs. We find 68 additional microtephra horizons through microscopic examination of 1050 samples (each integrating c. 3 ka) in over 200 m of marine sediments. We report the major and minor element geochemical compositions of individual glass shards in six of these microtephra horizons and establish a robust correlation at 168.73 m to the Lokochot Tuff (3.58 Ma), which together with previously identified tephra, provides a tightly constrained chronostratigraphy for the mid Pliocene.","author":null,"citation":"Sarah J. Feakins, Francis H. Brown, Peter B. deMenocal. 2007.\r\nPlio-Pleistocene microtephra in DSDP site 231, Gulf of Aden. \r\nJournal of African Earth Sciences, Vol. 48, Issue 5, pp. 341-352. \r\nDOI: 10.1016/j.jafrearsci.2007.05.004 ","edition":null,"identifier":{"id":"10.1016/j.jafrearsci.2007.05.004 ","type":"doi","url":"http://dx.doi.org/10.1016/j.jafrearsci.2007.05.004 "},"issue":null,"journal":"Journal of African Earth Sciences","pages":null,"pubRank":"1","pubYear":2007,"reportNumber":null,"title":"Plio-Pleistocene microtephra in DSDP site 231, Gulf of Aden","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":null,"site":[{"NOAASiteId":"54324","geo":{"geoType":"Feature","geometry":{"coordinates":["11.89","48.25"],"type":"POINT"},"properties":{"easternmostLongitude":"48.25","maxElevationMeters":"-2152","minElevationMeters":"-2152","northernmostLatitude":"11.89","southernmostLatitude":"11.89","westernmostLongitude":"48.25"}},"locationName":"Ocean>Indian Ocean>Arabian 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