Leg 210 summary

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doi: 10.2973/odp.proc.ir.210.101.2004
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
Ocean Drilling Program, Leg 210, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Woods Hole, MA, United States
Other:
IFREMER, 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 at Amherst, United States
National Taiwan Ocean University, Taiwan
Ecole et Observatoire des Sciences de la Terre, France
California State University, 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
Southampton Oceanography Centre, United Kingdom
University of Tokyo, Japan
National University of Ireland, Ireland
Shimane University, Japan
Rosenstiel School of Marine and Atmospheric Science, United States
Open University, United Kingdom
University of California at Santa Cruz, United States
Volume Title: Proceedings of the Ocean Drilling Program; initial reports; 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; 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; 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; Nevill, Heather
Source: Proceedings of the Ocean Drilling Program; initial reports; 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; 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, 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, Xixi Zhao and Heather Nevill; Ocean Drilling Program, Leg 210, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Part A: Initial Reports, Vol.210, 78p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0884-5883 CODEN: IDSDA6
Note: In English. Also available on CD-ROM in PDF format and on the Web in PDF or HTML. 89 refs.CD-ROM format, ISSN 1096-2522; WWW format, ISSN 1096-2158; illus., incl. sects., strat. cols., 2 tables, sketch maps
Summary: Ocean Drilling Program Leg 210 was devoted to studying the history of rifting and postrift sedimentation in the Newfoundland-Iberia rift. Drilling was conducted in the Newfoundland Basin along a transect conjugate to previous drilling on the Iberia margin (Legs 149 and 173). This was the first time that deep-sea drilling has been conducted on both sides of a nonvolcanic rift in order to understand the structural and sedimentary evolution of the complete rift system. The prime site during Leg 210 (Site 1276) was drilled in transitional crust between known continental crust and oceanic crust identified by magnetic Anomalies M3 to M0 (Barremian-Aptian). On the conjugate Iberia margin, extensive geophysical work and deep-sea drilling have shown that the transitional crust is exhumed mantle that is extensively serpentinized in its upper part. Transitional crust on the Newfoundland side, however, is typically a kilometer or more shallower and has much smoother topography, and seismic refraction data suggest that the crust may be thin (∼4 km) oceanic crust. These features indicate that the rift may have developed asymmetrically. A major goal at Site 1276 was to investigate these differences by sampling basement and the facies responsible for a strong overlying basinwide reflection (U) that is poorly developed on the conjugate Iberia margin, together with the intervening lithologic section. Site 1276 was cored from 800 to 1739 m below seafloor with excellent recovery (average = 85%). Before drilling was terminated because of unstable conditions in the uncased lower part of the hole, we cored sills >10 m thick that are estimated to be 100-200 m above basement. The sills are diabases of probable alkaline composition. They have sedimentary contacts that show extensive hydrothermal alteration. Associated sedimentary and structural features suggest that the sills were intruded at shallow levels below the seafloor. The top of the upper sill is approximately coincident with the U reflection, within uppermost Aptian(?) to lower Albian fine- to coarse-grained sedimentary gravity flows. The nature of basement at this site remains uncertain, but the presence of the deep sills indicates that there was a significant postrift magmatic event that may have affected much of the basin.
Year of Publication: 2004
Research Program: ODP Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Biostratigraphy; Canada; Cenozoic; Continental margin; Cores; Cretaceous; Eastern Canada; Geochemistry; Geophysical methods; Geophysical profiles; Geophysical surveys; Igneous rocks; Leg 210; Lithostratigraphy; Mesozoic; Metamorphic rocks; Newfoundland; Newfoundland Basin; Newfoundland and Labrador; Newfoundland-Iberia Transect; North Atlantic; ODP Site 1276; ODP Site 1277; Ocean Drilling Program; Ocean floors; Oligocene; Paleo-oceanography; Paleogene; Paleomagnetism; Rift zones; Seismic methods; Seismic profiles; Surveys; Tertiary
Coordinates: N451000 N453000 W0442000 W0450000
Record ID: 2005004706
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