Seismic volcanostratigraphy of the extrusive breakup complexes in the Northeast Atlantic; implications from ODP/DSDP drilling

Online Access: Get full text
doi: 10.2973/odp.proc.sr.163.101.1999
Author(s): Planke, Sverre; Alvestad, Eivind
Author Affiliation(s): Primary:
University of Oslo, Department of Geology, Oslo, Norway
Other:
Oregon State University, United States
Ocean Drilling Program, United States
Utsunomiya University, Japan
Université de Rennes I, France
RWTH Aachen, Federal Republic of Germany
Institut Méditerranéen de Technologie, France
University of Oregon, United States
Woods Hole Oceanographic Institution, United States
University of Edinburgh, United Kingdom
Université de Bretagne Occidentale, France
Washington State University, United States
Duke University, United States
Ohio State University, United States
Geological Survey of Denmark and Greenland, Denmark
University of California at Davis, United States
University of Tokyo, Japan
University of Queensland, Australia
Institut für Petrographie und Geochemie, Federal Republic of Germany
University of Oslo, Norway
University of Leicester, United Kingdom
University of Michigan, United States
Volume Title: Proceedings of the Ocean Drilling Program; scientific results, Southeast Greenland margin; covering Leg 163 of the cruises of the drilling vessel JOIDES Resolution, Reykjavik, Iceland, to Halifax, Nova Scotia, sites 988-990, 3 September-7 October 1995
Volume Author(s): Larsen, Hans-Christian; Duncan, Robert A.; Allan, James F.; Aita, Yoshiaki; Arndt, Nicholas T.; Bücker, Christian J.; Cambray, Hervé; Cashman, Katharine V.; Cerney, Brian P.; Clift, Peter D.; Fitton, J. Godfrey; Le Gall, Bernard; Hooper, Peter R.; Hurst, Stephen D.; Krissek, Lawrence A.; Kudless, Kristen E.; Larsen, Lotte Melchior; Lesher, Charles E.; Nakasa, Yukari; Niu, Yaoling; Philipp, Harald; Planke, Sverre; Rehacek, Jakub; Saunders, Andrew D.; Teagle, Damon A. H.; Tegner, Christian; Scroggs, John
Source: Proceedings of the Ocean Drilling Program; scientific results, Southeast Greenland margin; covering Leg 163 of the cruises of the drilling vessel JOIDES Resolution, Reykjavik, Iceland, to Halifax, Nova Scotia, sites 988-990, 3 September-7 October 1995, Hans-Christian Larsen, Robert A. Duncan, James F. Allan, Yoshiaki Aita, Nicholas T. Arndt, Christian J. Bücker, Hervé Cambray, Katharine V. Cashman, Brian P. Cerney, Peter D. Clift, J. Godfrey Fitton, Bernard Le Gall, Peter R. Hooper, Stephen D. Hurst, Lawrence A. Krissek, Kristen E. Kudless, Lotte Melchior Larsen, Charles E. Lesher, Yukari Nakasa, Yaoling Niu, Harald Philipp, Sverre Planke, Jakub Rehacek, Andrew D. Saunders, Damon A. H. Teagle, Christian Tegner and John Scroggs. Proceedings of the Ocean Drilling Program, Scientific Results, Vol.163, p.3-16. Publisher: Texas A & M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0884-5891
Note: In English. 42 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; all chapters are also available on the included CD-ROM in PDF format and on the Web in PDF or HTML; illus., incl. sects., 2 tables, sketch map
Summary: Seismic reflection data calibrated by scientific boreholes have proven the presence of voluminous early Tertiary extrusive volcanic complexes along the northeast Atlantic continental margins. Seismic facies interpretation of representative seismic profiles reveals the presence of one or more characteristic units of seaward-dipping reflectors (SDR) along most margin segments. Other volcanic seismic facies units, including Inner Flows, Lava Delta, Landward Flows, and Outer High are also identified regionally. More than 15 boreholes have sampled the extrusive volcanic complex, recovering subaerial flood basalts, shallow marine hydroclastites, and pillow lavas. Most of the deep holes are drilled into the Landward Flows unit. However, no well-defined reflectors have ever been penetrated within the extrusive complexes. Several of the volcanic facies units have not been drilled at all, including the Inner Flows and the Lava Delta, and only a few shallow holes have been drilled into the SDR. The nature of the intrabasement reflectivity is therefore presently poorly constrained. Representative seismic transects across the conjugate Southeast Greenland-Hatton Bank margins and the Jan Mayen Ridge-More Margin reveal a gross symmetry, as shown by the presence of SDR on all margin segments. In general, however, a lack of symmetry and significant variation in the nature, extent, and volume of the extrusive complexes are apparent. We suggest that the lack of symmetry is largely related to a tectonic control on the emplacement of the lava flows.
Year of Publication: 1999
Research Program: DSDP Deep Sea Drilling Project
ODP Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; 20 Geophysics, Applied; Arctic Ocean; Atlantic Ocean; Cenozoic; Continental margin; Deep Sea Drilling Project; Extrusive rocks; Geophysical methods; Geophysical profiles; Geophysical surveys; Igneous rocks; Jan Mayen Ridge; Lava flows; Leg 163; Lithostratigraphy; Lower Tertiary; North Atlantic; Northeast Atlantic; Norwegian Sea; Ocean Drilling Program; Ocean floors; Reflection methods; Seismic methods; Seismic profiles; Seismic stratigraphy; Surveys; Tertiary; Volcanic rocks
Coordinates: N633000 N654500 W0340000 W0401500
Record ID: 2000063780
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.