Meyers, Philip A.; Bernasconi, Stefano M. (2007): Data report; Organic carbon, total nitrogen, carbonate carbon, and carbonate oxygen isotopic compositions of Albian to Santonian black shales from sites 1257-1261 on the Demerara Rise. 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:2007-087730

Organic carbon, total nitrogen, carbonate carbon, and carbonate oxygen isotopic compositions were measured for 95 samples selected from the black shale sequences drilled during Ocean Drilling Program Leg 207 on the Demerara Rise. Most samples have organic delta (super 13) C values smaller than -27 per mil, with the exception of several samples that have values between -24.9 per mil and -23.9 per mil that may correspond to oceanic anoxic events. Bulk delta (super 15) N values range between -4.2 per mil and +4.4 per mil and become smaller as organic carbon concentrations increase. Comparison of the delta (super 15) N values of nondecarbonated samples to their decarbonated analogs reveals no systematic effect of the acid treatment used in the decarbonation.
West: -54.4400 East: -54.1100 North: 9.2800 South: 9.0200
Expedition: 207
Site: 207-1257
Site: 207-1258
Site: 207-1259
Site: 207-1260
Site: 207-1261
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