MacLeod, Kenneth G. (2007): Data report; Stable isotopic ratios in bulk carbonate from upper Campanian and Maastrichtian samples (Demerara Rise, western tropical North Atlantic)

Leg/Site/Hole:
ODP 207
ODP 207 1258
ODP 207 1259
ODP 207 1260
ODP 207 1261
Identifier:
2007-087726
georefid
10.2973/odp.proc.sr.207.110.2007
doi
Creator:
MacLeod, Kenneth G.
University of Missouri, Columbia, Department of Geological Sciences, Columbia, MO, United States
author
Identification:
Data report; Stable isotopic ratios in bulk carbonate from upper Campanian and Maastrichtian samples (Demerara Rise, western tropical North Atlantic)
2007
In: Mosher, David C., Erbacher, Jochen, Malone, Mitchell J., Berti, Debora, Bice, Karen L., Bostock, Helen, Brumsack, Hans-Juergen, Danelian, Taniel, Forster, Astrid, Glatz, Christine, Heidersdorf, Felix, Henderiks, Jorijntje, Janecek, Thomas R., Junium, Christopher, Le Callonnec, Laurence, MacLeod, Kenneth G., Meyers, Philip A., Mutterlose, H. Joerg, Nishi, Hiroshi, Norris, Richard D., Ogg, James G., O'Regan, A. Matthew, Rea, Brice, Sexton, Philip, Sturt, Helen, Suganuma, Yusuke, Thurow, Juergen W., Wilson, Paul A., Wise, Sherwood W., Jr., Proceedings of the Ocean Drilling Program; scientific results; Demerara Rise; equatorial Cretaceous and Paleogene paleoceanographic transect, western Atlantic; covering Leg 207 of the cruises of the Drilling Vessel JOIDES Resolution; Bridgetown, Barbados, to Rio de Janeiro, Brazil; sites 1257-1261; 11 January-6 March 2003
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
207
Stable isotopic values of 174 upper Campanian and Maastrichtian bulk carbonate samples from Demerara Rise, in the western tropical Atlantic (Ocean Drilling Program Leg 207, Sites 1257-1261), largely fall between 0 per mil and 2 per mil for delta (super 13) C and between -2 per mil and -3 per mil for delta (super 18) O. The relatively low values and high scatter of delta (super 13) C values observed suggest secondary calcite with a remineralized organic carbon component was present in most to all samples analyzed. Oxygen isotopic data exhibit less scatter and values closer to those expected for contemporary sea-surface conditions than do carbon data. However, trends in delta (super 18) O data at any one section do not correlate among sites using shipboard age estimates. Regardless of whether subsequent age estimates modify correlation among holes, diagenetic concerns will remain a significant complication in any efforts to study isotopic trends during the late Campanian-Maastrichtian at these sites.
English
Serial
Coverage:Geographic coordinates:
North:9.2800
West:-54.4400East: -54.1100
South:9.0200
Stratigraphy; Isotope geochemistry; Atlantic Ocean; boreholes; C-13/C-12; Campanian; carbon; carbonate rocks; carbonates; chemostratigraphy; continental margin; cores; Cretaceous; Demerara Rise; Equatorial Atlantic; French Guiana; geochemistry; isotope ratios; isotopes; Leg 207; Maestrichtian; Mesozoic; North Atlantic; Northwest Atlantic; O-18/O-16; Ocean Drilling Program; ODP Site 1258; ODP Site 1259; ODP Site 1260; ODP Site 1261; oxygen; paleoclimatology; paleotemperature; sedimentary rocks; Senonian; South America; stable isotopes; Surinam; Upper Cretaceous; variations; western Equatorial Atlantic;
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