noaa-ocean-13828 Gulf of Aden DSDP231 Plio-Pleistocene Tephra Shard Counts and Geochemistry Feakins, S.J.; Brown, F.H.; deMenocal, P.B. Gulf of Aden DSDP231 Plio-Pleistocene Tephra Shard Counts and Geochemistry 2013-02-11 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/13828 Investigator S.J. Feakins Investigator F.H. Brown Investigator P.B. deMenocal earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,mode earth science paleoclimate paleoceanography silicon dioxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography titanium dioxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography iron oxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,Fe2O3 earth science paleoclimate paleoceanography sodium oxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography chlorine,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography volcanic material,sediment,null,count per square centimeter,null,paleoceanography,null,null,N,tephra earth science paleoclimate paleoceanography volcanic material,sediment,null,count,null,paleoceanography,null,null,N,tephra earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,cumulative total of constituents earth science paleoclimate paleoceanography sample identification,null,null,null,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography calcium oxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography barium oxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography potassium oxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography iron,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography aluminum oxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography oxygen,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,DSDP Leg earth science paleoclimate paleoceanography zirconium dioxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography manganese oxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography magnesium oxide,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,sum of elements earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,DSDP Core earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,comments earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,DSDP Site earth science paleoclimate paleoceanography mineral matter,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography water content,volcanic material,null,weight percent,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography notes,null,null,null,null,paleoceanography,null,null,N,DSDP Section earth science paleoclimate paleoceanography depth,null,null,meter,null,paleoceanography,null,null,N,mbsf earth science paleoclimate paleocean geochemistry geoscientificInformation 4858000 cal yr BP 60000 cal yr BP Complete 11.89 11.89 48.25 48.25 -2152 -2152 Ocean Indian Ocean Arabian Sea DSDP 231>LATITUDE 11.89>LONGITUDE 48.25 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Sarah J. Feakins, Francis H. Brown, Peter B. deMenocal. 2007. Plio-Pleistocene microtephra in DSDP site 231, Gulf of Aden. Journal of African Earth Sciences, Vol. 48, Issue 5, pp. 341-352. DOI: 10.1016/j.jafrearsci.2007.05.004

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/feakins2007/feakins2007shardchem.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/feakins2007/feakins2007shardcount.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11