Geochemical evidence for the sedimentary and diagenetic development of the Mesozoic-early Cenozoic Newfoundland rifted margin, Northwest Atlantic (Ocean Drilling Program Leg 210, Site 1276)

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doi: 10.2973/odp.proc.sr.210.105.2007
Author(s): Robertson, Alastair H. F.
Ocean Drilling Program, Leg 210, Shipboard Scientfic Party, College Station, TX
Author Affiliation(s): Primary:
University of Edinburgh, Grant Institute of Earth Science, Edinburgh, United Kingdom
Other:
IFREMER Centre de Brest, France
Ocean Drilling Program, United States
University of Michigan, United States
University of Leicester, United Kingdom
Stockholm University, Sweden
Université Pierre et Marie Curie, France
Memorial University of Newfoundland, Canada
Lamont-Doherty Earth Observatory, United States
Florida State University, United States
University of Massachusetts, United States
National Taiwan Ocean University, Taiwan
Ecole et Observatoire des Sciences de la Terre, France
California State University, Northridge, United States
Bundesanstalt für Geowissenschaften und Rohstoffe, Federal Republic of Germany
Universität Tübingen, Federal Republic of Germany
University of Edinburgh, United Kingdom
Rice University, United States
Pennsylvania State University, United States
University of Wyoming, United States
University of Tokyo, Japan
National University of Ireland, Galway, Ireland
Shimane University, Japan
Rosenstiel School of Marine and Atmospheric Science, United States
Open University, United Kingdom
University of California, Santa Cruz, United States
Volume Title: Proceedings of the Ocean Drilling Program; scientific results; drilling the Newfoundland half of the Newfoundland-Iberia transect; the first conjugate margin drilling in a nonvolcanic rift; covering Leg 210 of the cruises of the Drilling Vessel JOIDES Resolution; St. Georges, Bermuda, to St. John's, Newfoundland; sites 1276 and 1277; 6 July-6 September 2003
Volume Author(s): Tucholke, Brian E.; Sibuet, Jean-Claude; Klaus, Adam; Arnaboldi, Michela; Delius, Heike; Engstrom, Anna V.; Galbrun, Bruno; Gardin, Silvia; Hiscott, Richard N.; Karner, Garry D.; Ladner, Bryan C.; Leckie, R. Mark; Lee, Chao-Shing; Manatschal, Gianreto; Marsaglia, Kathleen M.; Pletsch, Thomas K.; Pross, Jörg; Robertson, Alastair H. F.; Sawyer, Dale S.; Sawyer, Derek E.; Shillington, Donna J.; Shirai, Masaaki; Shryane, Thérèse; Stant, Sharon Audra; Takata, Hiroyuki; Urquhart, Elspeth; Wilson, Chris; Zhao, Xixi
Source: Proceedings of the Ocean Drilling Program; scientific results; drilling the Newfoundland half of the Newfoundland-Iberia transect; the first conjugate margin drilling in a nonvolcanic rift; covering Leg 210 of the cruises of the Drilling Vessel JOIDES Resolution; St. Georges, Bermuda, to St. John's, Newfoundland; sites 1276 and 1277; 6 July-6 September 2003, Brian E. Tucholke, Jean-Claude Sibuet, Adam Klaus, Michela Arnaboldi, Heike Delius, Anna V. Engstrom, Bruno Galbrun, Silvia Gardin, Richard N. Hiscott, Garry D. Karner, Bryan C. Ladner, R. Mark Leckie, Chao-Shing Lee, Gianreto Manatschal, Kathleen M. Marsaglia, Thomas K. Pletsch, Jörg Pross, Alastair H. F. Robertson, Dale S. Sawyer, Derek E. Sawyer, Donna J. Shillington, Masaaki Shirai, Thérèse Shryane, Sharon Audra Stant, Hiroyuki Takata, Elspeth Urquhart, Chris Wilson and Xixi Zhao; Ocean Drilling Program, Leg 210, Shipboard Scientfic Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.210, 63p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. 47 refs.WWW format, ISSN 1096-7451; illus., incl. sects., 1 table, sketch map
Summary: Inorganic chemical composition and downhole variation of major and trace elements yields useful insights into the sediment provenance and paleoceanography of deep-sea sediments of deepwater continental margins. Here, fine-grained sediments were chemically analyzed at ∼10-m intervals from the Eocene to Albian section at Site 1276. These sediments represent a time when background hemipelagic sedimentation was continuously beneath, or near, the calcite compensation depth (CCD). Additional samples were analyzed from the upper Paleocene-middle Eocene time interval to determine whether a volcaniclastic component is present, as suggested by petrographic studies of the coarser size fraction. Sediments recovered near the bottom of the hole show the effects of contact metamorphism adjacent to a sill of alkaline basalt. The overlying thick (∼700 m) Albian succession (lithologic Unit 5) is indicative of a dominantly terrigenous source. Redox-sensitive trace elements (e.g., Cu, Ni, V, and Cr) are concentrated in organic-rich layers (black shales) that can be partially correlated with oceanic anoxic Events 1a-1d and 2. Beginning around the Cenomanian/Turonian boundary, a profound change took place to more oxidizing, slowly depositing sediments throughout the North Atlantic, characterized by relative enrichment in Fe, Mn, and related trace metals (e.g., Cu, Ni, and Cr). Similar background conditions persisted until the Eocene when local conditions at Site 1276 became more reducing, as indicated by more subdued colors and lower MnO contents. Moderate upwelling along the Newfoundland continental margin during the Eocene is suggested by the presence of relatively high values of silica coupled with opaline silica. Phosphate and associated trace elements (e.g., Ce and Y) are locally enriched, suggesting relatively high primary productivity. However, productivity was lower than on the conjugate Iberia margin at Deep Sea Drilling Project Site 398. Fine-grained terrigenous sediments at Site 1276 probably were mainly derived from the Grand Banks (e.g., Avalon uplift) and finally accumulated in deep water below the CCD mainly as mud turbidites and hemipelagites.
Year of Publication: 2007
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Atlantic Ocean; Black shale; Canada; Cenozoic; Chemical composition; Chemical ratios; Chemostratigraphy; Clastic rocks; Continental margin; Cores; Cretaceous; DSDP Site 398; Deep Sea Drilling Project; Depositional environment; Diagenesis; Eastern Canada; Europe; Flemish Cap; Geochemistry; Geophysical methods; Geophysical profiles; Geophysical surveys; Grand Banks; IPOD; Iberian Peninsula; Leg 210; Leg 47; Lithostratigraphy; Major elements; Marine environment; Mesozoic; Newfoundland; Newfoundland and Labrador; North Atlantic; Northwest Atlantic; ODP Site 1276; Ocean Drilling Program; Paleo-oceanography; Paleoenvironment; Paleogene; Paleogeography; Plate tectonics; Provenance; Rifting; Sedimentary rocks; Seismic methods; Seismic profiles; Seismic stratigraphy; Southern Europe; Spatial variations; Spectra; Surveys; Terrigenous materials; Tertiary; Trace elements; X-ray fluorescence spectra
Coordinates: N452400 N452400 W0444700 W0444700
Record ID: 2007087761
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