Dynamic models of multiphase continental rifting and their implications for the Newfoundland and Iberia conjugate margins

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doi: 10.2973/odp.proc.sr.149.247.1996
Author(s): Tett, David L.; Sawyer, Dale S.
Author Affiliation(s): Primary:
Rice University, Department of Geology and Geophysics, Houston, TX, United States
Other:
Rice University, United States
Ocean Drilling Program, United States
Université Pierre et Marie Curie, France
Dalhousie University, Canada
Universidad de Granada, Spain
Université de Nantes, France
Florida State University, United States
Universidade de Aveiro, Portugal
INTERGEOS, Netherlands
University of Waterloo, Canada
Lamont-Doherty Earth Observatory, United States
University of Tokyo, Japan
GEOMAR, Federal Republic of Germany
University of Leicester, United Kingdom
University of Texas at El Paso, United States
University of Michigan, United States
Universität Kiel, Federal Republic of Germany
Cornell University, United States
California State University, United States
Iowa State University, United States
University of Maryland System, United States
Open University, United Kingdom
University of California, United States
Volume Title: 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
Volume Author(s): Whitmarsh, Robert B.; Sawyer, Dale S.; Klaus, Adam; Beslier, Marie-Odile; Collins, Eric S.; Comas, María 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
Source: 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, Robert B. Whitmarsh, Dale S. Sawyer, Adam Klaus, Marie-Odile Beslier, Eric S. Collins, María Carmen Comas, Guy Cornen, Eric de Kaenel, Luis de Menezes Pinheiro, Elisabeth Gervais, Ian L. Gibson, Dennis L. Harry, Michael A. Hobart, Toshiya Kanamatsu, Charlotte M. Krawcyzk, Li Liu, Jeremy C. Lofts, Kathleen M. Marsaglia, Philip A. Meyers, Doris Milkert, Kitty L. Milliken, Julia K. Morgan, Pedro Ramirez, Karl E. Seifert, Timothy J. Shaw, Chris Wilson, Chuan Yin and Xixi Zhao. Proceedings of the Ocean Drilling Program, Scientific Results, Vol.149, p.635-647. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0884-5891
Note: In English. 69 refs.; illus., incl. 2 tables, sects.
Summary: Rifting between Newfoundland and Iberia occurred in two distinct phases-the first late Triassic to Early Jurassic, the second Late Jurassic to Early Cretaceous-culminating in the creation of the North Atlantic Ocean. A dynamic modeling method is used to examine the implications of multiple phases of rifting on the development of the Newfoundland-Iberia conjugate margins. A set of models based roughly on the Newfoundland and Iberian Margins suggests that, under most conditions in which two rift phases occur, the site of the original rift will not be favored for extension when stretching resumes, because the upper mantle cools and strengthens in the area of the original rift. The models predict a lack of magmatism on these margins and suggest that extension was significantly greater in the second rifting phase than in the first; these predictions agree with geological observations. The models do not predict the existence of highly thinned continental crust on both conjugate margins, however.
Year of Publication: 1996
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Atlantic Ocean; Canada; Continental margin; Cretaceous; Crustal thinning; Eastern Canada; Europe; Extension; Extension tectonics; Iberian Peninsula; Iberian abyssal plain; Leg 149; Mesozoic; Models; Newfoundland; North Atlantic; Northeast Atlantic; Northwest Atlantic; Ocean Drilling Program; Plate tectonics; Rifting; Southern Europe; Subsidence; Tectonics
Coordinates: N390000 N410000 W0102000 W0153000
Record ID: 2007088121
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