Equatorial Pacific DSDP574 Miocene Biogenic Sediment Data Piela, C.; Lyle, M.; Marcantonio, F.; Baldauf, J.; Olivarez Lyle, A. Piela, C. Lyle, M. Marcantonio, F. Baldauf, J. Olivarez Lyle, A. biogeochemical cycles earth science/paleoclimate/paleoceanography (age,null,null,million years ago,null,paleoceanography,averaged,null,N,null) earth science/paleoclimate/paleoceanography (latitude,null,null,degree north,null,paleoceanography,null,null,N,paleolatitude) earth science/paleoclimate/paleoceanography (density,dry sediment,null,gram per cubic centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (accumulation rate,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,bulk mass accumulation) earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,calcium carbonate mass accumulation) earth science/paleoclimate/paleoceanography (age at sample start,null,null,million years ago,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (barium,sediment,null,milligram per square centimeter per kiloyear,null,paleoceanography,null,null,N,barium mass accumulation) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,DSDP leg) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,DSDP site) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (longitude,null,null,degree west,null,paleoceanography,null,null,N,paleolongitude) earth science/paleoclimate/paleoceanography (density,wet sediment,null,gram per cubic centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (barium,sediment,null,microgram per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (organic carbon,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age at sample end,null,null,million years ago,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (sample identification,null,null,null,null,paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,Interval Top cm) earth science/paleoclimate/paleoceanography (organic carbon,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,organic carbon mass accumulation) earth science/paleoclimate/paleoceanography (biogenic silica,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,Biogenic silica mass accumulation rate) earth science/paleoclimate/paleoceanography (barium,sediment,null,milligram per square centimeter per kiloyear,null,paleoceanography,null,null,N,Barium mass accumulation rate) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,DSDP hole) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,DSDP core) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,DSDP section) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,Interval Bottom cm) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,biogenic silica notes) earth science/paleoclimate/paleoceanography (carbon,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (sedimentation rate,null,null,centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (thorium,sediment,null,parts per billion,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (dust,sediment,null,weight percent,null,paleoceanography,null,null,N,(Th/10.7)) earth science/paleoclimate/paleoceanography (uranium,sediment,null,nanogram per square centimeter per kiloyear,null,paleoceanography,null,null,N,Uranium mass accumulation rate) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,Sum of major sediment components) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,Site 574 Sample Interval Hole-Core-Section-depth [cm]) earth science/paleoclimate/paleoceanography (uranium,sediment,null,parts per billion,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (thorium,sediment,null,nanogram per square centimeter per kiloyear,null,paleoceanography,null,null,N,Thorium mass accumulation rate) earth science/paleoclimate/paleocean (DSDP 574>LATITUDE 4.22>LONGITUDE -133.33) The equatorial Pacific is an important part of the global carbon cycle and has been affected by climate change through the Cenozoic (65 Ma to present). We present a Miocene (12-24 Ma) biogenic sediment record from Deep Sea Drilling Project (DSDP) Site 574 and show that a CaCO3 minimum at 17 Ma was caused by elevated CaCO3 dissolution. When Pacific Plate motion carried Site 574 under the equator at about 16.2 Ma, there is a minor increase in biogenic deposition associated with passing under the equatorial upwelling zone. The burial rates of the primary productivity proxies biogenic silica (bio-SiO2) and biogenic barium (bio-Ba) increase, but biogenic CaCO3 decreases. The carbonate minimum is at ~17 Ma coincident with the beginning of the Miocene climate optimum; the transient lasts from 18 to 15 Ma. Bio-SiO2 and bio-Ba are positively correlated and increase as the equator was approached. Corg is poorly preserved, and is strongly affected by changing carbonate burial. Terrestrial 232Th deposition, a proxy for aeolian dust, increases only after the Site 574 equator crossing. Since surface production of bio-SiO2, bio-Ba, and CaCO3 correlate in the modern equatorial Pacific, the decreased CaCO3 burial rate during the Site 574 equator crossing is driven by elevated CaCO3 dissolution, representing elevated ocean carbon storage and elevated atmospheric CO2. The length of the 17 Ma CaCO3 dissolution transient requires interaction with a 'slow' part of the carbon cycle, perhaps elevated mantle degassing associated with the early stages of Columbia River Basalt emplacement. STUDY NOTES: Equatorial Pacific Deep Sea Drilling Project (DSDP) Site 574 Miocene biogenic sediment data. Data include CaCO3, C-org, bio-Sio2, Ba, U, and Th data from Piela et al 2012. CaCO3 and C-org were measured with coulometer, bio-SiO2 by digestion and molybdate blue method, Ba-U-Th by ICP-MS on a total sediment digestion. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Piela, C. Investigator : Lyle, M. Investigator : Marcantonio, F. Investigator : Baldauf, J. Investigator : Olivarez Lyle, A. 2013-04-10 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/14191 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012mar.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012biogenic.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012mar.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012biogenic.txt English https://www.ncdc.noaa.gov/paleo/study/14191 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012mar.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/piela2012/piela2012biogenic.txt Piela, C., M. Lyle, F. Marcantonio, J. Baldauf, and A. Olivarez Lyle. 2012. Biogenic sedimentation in the equatorial Pacific: Carbon cycling and paleoproduction, 12-24 Ma. Paleoceanography, 27, PA2204, doi:10.1029/2011PA002236 START YEAR: 24000000 cal yr BP * END YEAR: 12500000 cal yr BP -133.33 4.22 -133.33 4.22