SE Atlantic Late Miocene Carbonate Crash and Biogenic Bloom Data from cruise ODP175 Diester-Haass, L.; Meyers, P.A.; Bickert, T. Diester-Haass, L. Meyers, P.A. Bickert, T. earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,accum. rate) earth science/paleoclimate/paleoceanography (delta 18O,benthic foraminifer,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (total benthic foraminifers,sediment,null,count per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (identified foraminifer,sediment,null,count per square centimeter per kiloyear,null,paleoceanography,null,null,N,Uvingerina sp. accumulation rate) earth science/paleoclimate/paleoceanography (organic carbon,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,mass accumulation rate) earth science/paleoclimate/paleoceanography (sand,sediment,null,percent,null,paleoceanography,null,null,N,>63 microns) earth science/paleoclimate/paleoceanography (total benthic foraminifers,sediment,null,count per gram,null,paleoceanography,null,null,N,>500 um fraction) earth science/paleoclimate/paleoceanography (identified foraminifer,sediment,null,count per gram,null,paleoceanography,null,null,N,Uvigerina sp.) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (organic carbon,sediment,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (total benthic foraminifers,sediment,null,dimensionless,null,paleoceanography,null,null,N,benthic/(planktic plus benthic foraminifera)) earth science/paleoclimate/paleoceanography (sand,sediment,null,percent,null,paleoceanography,null,null,N,"Shelf-derived particles (>63 micron) including coarse mollusc debris, relict shell material, decapods, phosphorite") earth science/paleoclimate/paleoceanography (pyrite,sediment,null,percent,null,paleoceanography,null,null,N,>63 microns) earth science/paleoclimate/paleoceanography (total benthic foraminifers,sediment,null,count per square centimeter per kiloyear,null,paleoceanography,null,null,N,accum. rate) earth science/paleoclimate/paleoceanography (sedimentation rate,null,null,centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (glauconite,sediment,null,percent,null,paleoceanography,null,null,N,40-63 micron fraction) earth science/paleoclimate/paleoceanography (mineral matter,sediment,null,percent,null,paleoceanography,null,null,N,40-63 micron fraction; terrigenous sediment identified at grain level) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (fish index,sediment,null,percent,null,paleoceanography,null,null,N,fish debris) earth science/paleoclimate/paleoceanography (total benthic foraminifers,sediment,null,count per gram,null,paleoceanography,null,null,N,125-250 um fraction) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP1087>LATITUDE -31.47>LONGITUDE 15.32) (ODP1086>LATITUDE -31.55>LONGITUDE 15.67) (ODP 1085>LATITUDE -29.37>LONGITUDE 13.6) Middle/late Miocene to early Pliocene sedimentary sequences along the continental margin of southwest Africa have changes that correspond to the carbonate crash (12-9 Ma) and biogenic bloom events (~7-4 Ma) described in the equatorial Pacific by Farrell et al. [1995]. To explore the origins of these changes, we analyzed the carbon and coarse fraction contents of sediments from ODP Sites 1085, 1086, and 1087 at a time resolution of 5 to 30 kyr. Several major drops in CaCO3 concentration between 12 and 9 Ma are caused by dilution from major increases in clastic input from the Oranje River during global sea level regressions. Abundant pyrite crystals and good preservation of fish debris reflect low oxygenation of bottom/pore waters. Regional productivity was enhanced during the time equivalent to the carbonate crash period. Higher benthic/planktic foraminiferal ratios indicate that CaCO3 dissolution at Site 1085 peaked between 9 to 7 Ma, which was after the global carbonate crash. This period of enhanced dissolution suggests that Site 1085 was located within a low-oxygen water mass that dissolved CaCO3 more easily than North Atlantic Deep Water, which began to bathe this site at 7 Ma. At 7 to 6 Ma, the onset of the biogenic bloom, increases and variations in total organic carbon and benthic foraminiferal accumulation rates show that paleoproductivity increased significantly above values observed during the carbonate crash period and fluctuated widely. We attribute the late Miocene paleoproductivity increase off southwest Africa to ocean-wide increases in nutrient supply and delivery. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Diester-Haass, L. Investigator : Meyers, P.A. Investigator : Bickert, T. 2004-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/2611 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/diester-haass2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1085-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1087c-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1086a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/diester-haass2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1085-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1087c-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1086a-tab.txt English https://www.ncdc.noaa.gov/paleo/study/2611 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/diester-haass2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1085-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1087c-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1086a-tab.txt Diester-Haass, L., P.A. Meyers, and T. Bickert. 2004. Carbonate crash and biogenic bloom in the late Miocene: Evidence from ODP sites 1085, 1086, and 1087 in the Cape Basin, southeast Atlantic Ocean. Paleoceanography 19(1):PA1007. START YEAR: 14476448 14C yr BP * END YEAR: 2894600 14C yr BP 13.6 -31.55 15.67 -29.37