Meyers, Philip A.; Forster, Astrid; Sturt, Helen; Erbacher, Jochen; Mosher, David C.; Malone, Mitchell J.; Berti, Debora; Bice, Karen L.; Bostock, Helen; Brumsack, Hans-Juergen; Danelian, Taniel; Glatz, Christine; Heidersdorf, Felix; Henderiks, Jorijntje; Janecek, Thomas R.; Junium, Christopher; Le Callonnec, Laurence; MacLeod, Ken; Mutterlose, H. Joerg; Nishi, Hiroshi; Norris, Richard D.; Ogg, James G.; O'Regan, A. Matthew; Rea, Brice; Sexton, Philip; Suganuma, Yusuke; Thurow, Juergen W.; Wilson, Paul A.; Wise, Sherwood W., Jr. (2004): Microbial gases in black shale sequences on the Demerara Rise. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: Erbacher, Jochen, Mosher, David C., 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, Ken, Meyers, Philip A., Mutterlose, H. Joerg, Nishi, Hiroshi, Norris, Richard D., Ogg, James G., O'Regan, Matthew A., Rea, Brice, Sexton, Philip, Sturt, Helen, Suganuma, Yusuke, Thurow, Juergen W., Wilson, Paul A., Wise, Sherwood W., Jr., Chapman, Mary (editor), Peters, Lorri L. (editor), Proceedings of the Ocean Drilling Program; 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:2004-051323

The amounts and compositions of interstitial gases found at the five sites cored on the Demerara Rise during Leg 207 are related to sediment lithology. Concentrations are low in the sedimentary units overlying Cenomanian-Santonian black shales, where they increase to maximum values. A microbial origin for most of the gases is inferred from the low thermal maturity of organic matter and the predominance of methane in their compositions. Active in situ gas generation is postulated to compensate for migration of methane out of the black shale units. Trace amounts of C4-C6 gases found in the black shale units likely migrated from deeper in the section.
West: -55.0000 East: -53.5000 North: 10.0000 South: 9.0000
Expedition: 207
Site: 207-1257
Site: 207-1258
Site: 207-1259
Site: 207-1260
Site: 207-1261
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