Shackleton Nicholas J http://en.wikipedia.org/wiki/Nicholas_Shackleton Hall Michael A 1995 (Table 2) Stable carbon and oxygen isotope ratios of bulk sediment from ODP Hole 138-844B dataset https://doi.org/10.1594/PANGAEA.807063 Shackleton Nicholas J http://en.wikipedia.org/wiki/Nicholas_Shackleton Hall Michael A 1995 Stable isotope records in bulk sediments (Leg 138) book chapter In: Pisias, NG; Mayer, LA; Janecek, TR; Palmer-Julson, A; van Andel, TH (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program) 138 https://doi.org/10.2973/odp.proc.sr.138.150.1995 797-805 Several hundred samples of bulk sediments from all the 11 sites drilled during Ocean Drilling Program (ODP) Leg 138 in the eastern equatorial Pacific Ocean have been analyzed for d13C and d18O. The d13C records provide information on the changes in the operation of the global carbon cycle during the late Neogene that were postulated by Shackleton (1985) on the basis of analogous data from Deep Sea Drilling Program (DSDP) Leg 74 in the South Atlantic. The general validity of the trend from isotopically heavier d13C values during the mid-Miocene toward lighter values today is confirmed. The data appear to be useful for high-resolution correlation among sites. The origin of the variability is enigmatic; even in the Pleistocene, there is low-frequency variability in bulk sediment d13C having an amplitude of more than 1 per mil that is not present in d13C records from foraminifers, and the concerns expressed by Broecker and Woodruff (1992, doi:10.1016/0016-7037(92)90302-Y) regarding the interpretation of the record must be taken seriously. The bulk-sediment d18O data for the past 1 m.y. show a latitudinal trend that is consistent with the present-day surface temperature gradient, with cooler water on the equator caused by upwelling. The data for the interval 1 to 4 Ma show a similar trend, but between 4 and 7 Ma, the gradient across latitude is steeper. When interpreted in terms of temperature, this implies that surface temperatures along the equator were lower during the interval of exceptionally high sediment accumulation rates of the latest Miocene and early Pliocene. This intense equatorial upwelling declined at about 4 Ma, perhaps as the connection to the Atlantic Ocean across Middle America became ineffective. In the sediment immediately above 11- to 12-Ma-old basement, the d18O values at Sites 849, 850, 851, and 852 become isotopically heavier than the values for sediment of similar age from Site 845 (which lies on 16-Ma-old basement and preserves a longer record). This may imply diagenetic exchange at a relatively low temperature (altering the d18O value toward a more positive value). Overall, the data sets are remarkably consistent. This suggests that other than close to basement, the isotopic effects of diagenetic change must be small and spatially smooth. It should be possible to retrieve long sea-surface temperature records of immense value from these data. -90.48076 -90.48076 7.92131 7.92131 -90.48076 7.92131 1991-05-11T10:24:00 1991-08-09T06:00:00 0.75 265.65 ODP Ocean Drilling Program https://www-odp.tamu.edu:443/ Ocean Drilling Program, Texas A&M University ODP http://www-odp.tamu.edu/ https://ror.org/01f5ytq51 138-844B 7.92131 -90.48076 -3414.5 1991-08-09T06:00:00 1991-05-11T10:24:00 290.9 m 289.92 m North Pacific Ocean Leg138 https://doi.org/10.2973/odp.proc.ir.138.1992 Mayer, Larry A Pisias, Nicklas G 1991-05-06 1991-07-05 Joides Resolution https://www-odp.tamu.edu:443/resolutn.html Drilling/drill rig DRILL 31 core; 290.9 m cored; 0 m drilled; 99.7 % recovery 1182 CC-BY-3.0 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/ DEPTH, sediment is given in mbsf. Sample code/label Sample label DSDP/ODP/IODP sample designation hdl:10013/epic.27914.d001 Shackleton Nicholas J http://en.wikipedia.org/wiki/Nicholas_Shackleton Sample label DEPTH, sediment/rock Depth sed m depth http://purl.obolibrary.org/obo/PATO_0001595 sediment http://purl.obolibrary.org/obo/ENVO_00002007 rock Length L http://dbpedia.org/resource/Length Depth sed [m] Difference Diff Shackleton Nicholas J http://en.wikipedia.org/wiki/Nicholas_Shackleton Depth [m] Diff Depth, composite Depth comp mcd depth http://purl.obolibrary.org/obo/PATO_0001595 Luminous Intensity J http://dbpedia.org/resource/Luminous_intensity Shackleton Nicholas J http://en.wikipedia.org/wiki/Nicholas_Shackleton Depth comp [mcd] AGE Age ka BP http://en.wikipedia.org/wiki/Kyr age http://purl.obolibrary.org/obo/PATO_0000011 Time T http://dbpedia.org/resource/Time Age [ka BP] Sample ID Sample ID Shackleton Nicholas J http://en.wikipedia.org/wiki/Nicholas_Shackleton Sample ID δ18O, carbonate δ18O carb ‰ PDB δ18O http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes carbonate http://purl.obolibrary.org/obo/CHEBI_41609 Mass spectrometer VG SIRA Chromatographs & spectrometers mass spectrometers http://vocab.nerc.ac.uk/collection/L05/current/LAB16/ Shackleton Nicholas J http://en.wikipedia.org/wiki/Nicholas_Shackleton δ18O carb [‰ PDB] δ13C, carbonate δ13C carb ‰ PDB δ13C http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes carbonate http://purl.obolibrary.org/obo/CHEBI_41609 Mass spectrometer VG SIRA Chromatographs & spectrometers mass spectrometers http://vocab.nerc.ac.uk/collection/L05/current/LAB16/ Shackleton Nicholas J http://en.wikipedia.org/wiki/Nicholas_Shackleton δ13C carb [‰ PDB] supplement citable author29993 author526 basis5 campaign110 event31244 geocode1 geocode1599 geocode1600 geocode1601 geocode2205 geocode8128 inst34 license101 method10974 method5059 method633 param15361 param16065 param2 param2094 param2095 param790 pi526 project3 ref39189 term1073089 term1073093 term1073131 term1073135 term1073143 term2299515 term23838 term38263 term41056 term43863 term43884 term43975 term68027