Serpentinite-breccia landslide deposits generated during crustal extension at the Iberia Margin
| Online Access: |
Get full text doi: 10.2973/odp.proc.sr.149.226.1996 |
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| Author(s): | Gibson, Ian L.; Milliken, Kitty L.; Morgan, Julia K. |
| Author Affiliation(s): |
Primary: University of Waterloo, Department of Earth Sciences, Waterloo, ON, Canada 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 University of Texas at Austin, United States University of Washington, 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.571-575. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 0884-5891 |
| Note: | In English. 40 refs. |
| Summary: | Three serpentinite-breccia units, pre-Late Cretaceous to late Barremian in age, were recovered from Subunit IVA (369.9-484.2 m below seafloor in Hole 899B), one approximately 95 m thick, and two less than 20 m. The three are similar and are interpreted to be bedded tabular units. Each contains angular fragments, many displaying jigsaw/crackle textures, set in a matrix apparently generated by fragmentation of the clasts. Sorting is generally absent, but larger boulders tend to occur in the upper half of the thickest unit. Minor internal deformation zones or slip zones occur. All these features are common in subaerial giant landslide deposits, and the serpentinite breccias are interpreted as being equivalent submarine deposits, generated by slope failure on a nearby large serpentinite fault scarp. Giant landslides are a typical feature of regions undergoing rapid extensional deformation, and such deposits may be relatively common in strongly faulted submarine extensional environments. The basement topography at the time of formation of the serpentinite units probably differed significantly from the present topography buried beneath the Iberia Abyssal Plain. As a result, the location of the source serpentinite escarpment is unknown. However, the large size of some of the fragments included within the serpentinite indicates that it was probably within a few kilometers of Site 899. The aggregate width of the belt of mantle serpentinite exposed in the Late Cretaceous at the Iberia Margin was at least 20 km. Most of this belt is now buried beneath the sediments of the Iberia Abyssal Plain. |
| Year of Publication: | 1996 |
| Research Program: |
ODP Ocean Drilling Program |
| Key Words: | 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Barremian; Breccia; Continental margin; Cretaceous; Depositional environment; Europe; Extension tectonics; Fractures; Iberian Peninsula; Iberian abyssal plain; Landslides; Leg 149; Lower Cretaceous; Mass movements; Mesozoic; Metaigneous rocks; Metamorphic rocks; Metasomatic rocks; North Atlantic; Northeast Atlantic; ODP Site 899; Ocean Drilling Program; Paleo-oceanography; Serpentinite; Southern Europe; Syntectonic processes; Tectonics |
| Coordinates: |
N404622
N404622
W0121604
W0121604 |
| Record ID: | 2007088116 |
| Copyright Information: | GeoRef, Copyright 2019 American Geosciences Institute. |