MacLeod, Kenneth G. (2007): Data report; Stable isotopic ratios in bulk carbonate from upper Campanian and Maastrichtian samples (Demerara Rise, western tropical North Atlantic). Texas A&M University, Ocean Drilling Program, College Station, TX, United States, 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, 207, georefid:2007-087726

Abstract:
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.
Coverage:
West: -54.4400 East: -54.1100 North: 9.2800 South: 9.0200
Relations:
Expedition: 207
Site: 207-1258
Site: 207-1259
Site: 207-1260
Site: 207-1261
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.207.110.2007 (c.f. for more detailed metadata)
This metadata in ISO19139 XML format