Meyers, Philip A. (1996): Geochemical comparisons of organic matter in Cretaceous black shales from Site 897, Iberia abyssal plain, sites 638 and 641, Galicia margin, and Site 398, Vigo Seamount. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: Whitmarsh, Robert B., Sawyer, Dale S., Klaus, Adam, Beslier, Marie-Odile, Collins, Eric S., Comas, Maria Carmen, Cornen, Guy, de Kaenel, Eric, Pinheiro, Luis de Menezes, Gervais, Elisabeth, Gibson, Ian L., Harry, Dennis L., Hobart, Michael A., Kanamatsu, Toshiya, Krawcyzk, Charlotte M., Liu, Li, Lofts, Jeremy C., Marsaglia, Kathleen M., Meyers, Philip A., Milkert, Doris, Milliken, Kitty L., Morgan, Julia K., Ramirez, Pedro, Seifert, Karl E., Shaw, Timothy J., Wilson, Chris, Yin, Chuan, Zhao, Xixi, Proceedings of the Ocean Drilling Program; scientific results, Iberia abyssal plain; covering Leg 149 of the cruises of the Drilling Vessel JOIDES Resolution; Balboa Harbor, Panama, to Lisbon, Portugal; sites 897-901, 10 March-25 May 1993, 149, 295-300, georefid:2007-088094

Three episodes of accumulation of organic-carbon-rich "black shales" occurred on the Iberia Margin of the North Atlantic during the Early-middle Cretaceous. The origins of the organic matter contents of these deposits have been investigated using elemental, isotopic, Rock-Eval, and biomarker analyses. The organic matter in Berriasian-Barremian turbiditic marlstones contains major proportions of continental plant material. Aptian-Albian turbiditic shale sequences include black layers similarly dominated by land-derived organic matter but also having important amounts of marine material. A thin layer of Cenomanian-Turonian black shale contains over 11% organic carbon, most of which is derived from marine sources. Downslope transport and rapid reburial of shelf-edge sediments within predominantly oxygenated deep-water settings contributed to deposition of the Early Cretaceous black shales. The Cenomanian-Turonian black shales evidently record a brief episode of intensified mid-water oxygen minimum zone and consequent improved preservation of marine organic matter during the middle Cretaceous.
West: -12.2847 East: -10.4306 North: 42.0918 South: 40.5019
Expedition: 103
Site: 103-638
Site: 103-641
Expedition: 149
Site: 149-897
Expedition: 47
Site: 47-398
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