Sedimentation and Accumulation of organic carbon in the Angola Basin and on Walvis Ridge: Preliminary results of Deep Sea Drilling Project Leg 75

Research Article| October 01, 1982 Sedimentation and Accumulation of organic carbon in the Angola Basin and on Walvis Ridge: Preliminary results of Deep Sea Drilling Project Leg 75 WILLIAM W. HAY; WILLIAM W. HAY Co-Chief Scientist 1Joint Oceanographic Institutions Inc., Washington, D.C., 20037 Search for other works by this author on: GSW Google Scholar JEAN-CLAUDE SIBUET; JEAN-CLAUDE SIBUET Co-Chief Scientist 2Centre Oceanologique de Bretagne, 29273 Brest Cedex, France Search for other works by this author on: GSW Google Scholar ERIC J. BARRON; ERIC J. BARRON 3National Center for Atmospheric Research, Boulder, Colorado 80307 Search for other works by this author on: GSW Google Scholar ROBERT E. BOYCE; ROBERT E. BOYCE 4DSDP, Scripps Institution of Oceanography, La Jolla, California 92037 Search for other works by this author on: GSW Google Scholar SIMON BRASSELL; SIMON BRASSELL 5University of Bristol, Bristol, United Kingdom Search for other works by this author on: GSW Google Scholar WALTER E. DEAN; WALTER E. DEAN 6U.S. Geological Survey, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar ALAIN Y. HUC; ALAIN Y. HUC 7IFP, 92506 Rueil-Malmaison, France Search for other works by this author on: GSW Google Scholar BARBARA H. KEATING; BARBARA H. KEATING 8University of Hawaii at Manoa, Honolulu, Hawaii 96822 Search for other works by this author on: GSW Google Scholar CHARLES L. McNULTY; CHARLES L. McNULTY 9University of Texas at Arlington, Arlington, Texas 76010 Search for other works by this author on: GSW Google Scholar PHILIP A. MEYERS; PHILIP A. MEYERS 10University of Michigan, Ann Arbor, Michigan 48104 Search for other works by this author on: GSW Google Scholar MASATO NOHARA; MASATO NOHARA 11Geological Survey of Japan, Ibaraki, Japan Search for other works by this author on: GSW Google Scholar ROGER E. SCHALLREUTER; ROGER E. SCHALLREUTER 12University of Hamburg, Hamburg, Federal Republic of Germany Search for other works by this author on: GSW Google Scholar JOHN C. STEINMETZ; JOHN C. STEINMETZ 13University of South Florida, St. Petersburg, Florida 33701 Search for other works by this author on: GSW Google Scholar DORRIK STOW; DORRIK STOW 14University of Edinburgh, Edinburgh, Scotland Search for other works by this author on: GSW Google Scholar HERBERT STRADNER HERBERT STRADNER 15Geological Survey of Austria, Vienna, Austria Search for other works by this author on: GSW Google Scholar Author and Article Information WILLIAM W. HAY Co-Chief Scientist 1Joint Oceanographic Institutions Inc., Washington, D.C., 20037 JEAN-CLAUDE SIBUET Co-Chief Scientist 2Centre Oceanologique de Bretagne, 29273 Brest Cedex, France ERIC J. BARRON 3National Center for Atmospheric Research, Boulder, Colorado 80307 ROBERT E. BOYCE 4DSDP, Scripps Institution of Oceanography, La Jolla, California 92037 SIMON BRASSELL 5University of Bristol, Bristol, United Kingdom WALTER E. DEAN 6U.S. Geological Survey, Denver, Colorado 80225 ALAIN Y. HUC 7IFP, 92506 Rueil-Malmaison, France BARBARA H. KEATING 8University of Hawaii at Manoa, Honolulu, Hawaii 96822 CHARLES L. McNULTY 9University of Texas at Arlington, Arlington, Texas 76010 PHILIP A. MEYERS 10University of Michigan, Ann Arbor, Michigan 48104 MASATO NOHARA 11Geological Survey of Japan, Ibaraki, Japan ROGER E. SCHALLREUTER 12University of Hamburg, Hamburg, Federal Republic of Germany JOHN C. STEINMETZ 13University of South Florida, St. Petersburg, Florida 33701 DORRIK STOW 14University of Edinburgh, Edinburgh, Scotland HERBERT STRADNER 15Geological Survey of Austria, Vienna, Austria Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1982) 93 (10): 1038–1050. https://doi.org/10.1130/0016-7606(1982)93<1038:SAAOOC>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation WILLIAM W. HAY, JEAN-CLAUDE SIBUET, ERIC J. BARRON, ROBERT E. BOYCE, SIMON BRASSELL, WALTER E. DEAN, ALAIN Y. HUC, BARBARA H. KEATING, CHARLES L. McNULTY, PHILIP A. MEYERS, MASATO NOHARA, ROGER E. SCHALLREUTER, JOHN C. STEINMETZ, DORRIK STOW, HERBERT STRADNER; Sedimentation and Accumulation of organic carbon in the Angola Basin and on Walvis Ridge: Preliminary results of Deep Sea Drilling Project Leg 75. GSA Bulletin 1982;; 93 (10): 1038–1050. doi: https://doi.org/10.1130/0016-7606(1982)93<1038:SAAOOC>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Leg 75 investigated two periods of accumulation of sediments rich in organic matter. In the Upper Cretaceous section, more than 200 beds of gray or black shale and mudstone rich in organic carbon (as much as 18%) are intercalated within a sequence of red and green mudstones that contain less than 1% organic carbon. The black shale beds are 1 to 62 cm thick and constitute less than 10% of the section in the 20 cores in which they were recovered. Both turbiditic and pelagic processes were involved in the deposition of these black shale beds. A combination of factors, including increased productivity and warm saline bottom waters, probably resulted in a delicate balance between oxic and anoxic conditions that periodically favored the accumulation and preservation of organic matter in the basinal sediments. The Pliocene-Pleistocene sediments are thoroughly bioturbated, and there is no evidence of persisting anoxia in the overlying water in spite of the high organic carbon content of the sediments. These two different periods of accumulation of organic matter both resulted in significant concentration of organic carbon (>2%, maximum 18%), but the Pliocene-Pleistocene sediments contain the greater mass of organic carbon per unit volume of the solid sediment. This content is PDF only. 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