Drilling to gabbro in intact ocean crust

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doi: 10.1126/science.1126090
Author(s): Wilson, Douglas S.; Teagle, Damon A. H.; Alt, Jeffrey C.; Banerjee, Neil R.; Umino, Susumu; Miyashita, Sumio; Acton, Gary D.; Anma, Ryo; Barr, Samantha R.; Belghoul, Akram; Carlut, Julie; Christie, David M.; Coggon, Rosalind M.; Cooper, Kari M.; Cordier, Carole; Crispini, Laura; Durand, Sedelia Rodriguez; Einaudi, Florence; Galli, Laura; Gao, Yongjun; Geldmacher, Jörg; Gilbert, Lisa A.; Hayman, Nicholas W.; Herrero-Bervera, Emilio; Hirano, Nobuo; Holter, Sara; Ingle, Stephanie; Jiang, Shijun; Kalberkamp, Ulrich; Kerneklian, Marcie; Koepke, Jürgen; Laverne, Christine; Vasquez, Haroldo L. Lledo; Maclennan, John; Morgan, Sally; Neo, Natsuki; Nichols, Holly J.; Park, Sung-Hyun; Reichow, Marc K.; Sakuyama, Tetsuya; Sano, Takashi; Sandwell, Rachel; Scheibner, Birgit; Smith-Duque, Chris E.; Swift, Stephen A.; Tartarotti, Paola; Tikku, Anahita A.; Tominaga, Masako; Veloso, Eugenio A.; Yamasaki, Toru; Yamazaki, Shusaku; Ziegler, Christa
Ocean Drilling Program, Leg 206, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
University of California at Santa Barbara, Department of Earth Science, Santa Barbara, CA, United States
Other:
University of Southampton, United Kingdom
University of Michigan, United States
Texas A&M University, United States
Shizuoka University, Japan
Niigata University, Japan
University of California at Davis, United States
University of Tsukuba, Japan
University of Leicester, United Kingdom
Institut des Sciences de la Terre, de l'Environnement et de l'Espace de Montpellier, France
École Normale Supérieure de Paris, France
Oregon State University, United States
Institut Universitaire Européen de la Mer, France
Universita di Genova, Italy
Florida International University, United States
Universita di Milano, Italy
University of Houston, United States
Leibniz Institute for Marine Sciences Kiel, Federal Republic of Germany
Williams College and Mystic Seaport, United States
Duke University, United States
University of Hawaii at Manoa, United States
Tohoku University, Japan
University of Saint Thomas, United States
Florida State University, United States
Bundesanstalt für Geowissenschaften und Rohstoffe, Federal Republic of Germany
University of Utah, United States
Universität Hannover, Federal Republic of Germany
Université Paul Cézanne Aix-Marseille III, France
University of Las Vegas, United States
University of Cambridge, United Kingdom
University of Leeds, United Kingdom
Polar Research Institute, South Korea
University of Tokyo, Japan
National Science Museum, Japan
Macquarie University, Australia
Universität Karlsruhe, Federal Republic of Germany
Woods Hole Oceanographic Institution, United States
Rensselaer Polytechnic Institute, United States
Hokkaido University, Japan
Boston University, United States
Volume Title: Science
Source: Science, 312(5776), p.1016-1020. Publisher: American Association for the Advancement of Science, Washington, DC, United States. ISSN: 0036-8075 CODEN: SCIEAS
Note: In English. 51 refs.; illus., incl. geol. sketch map
Summary: Sampling an intact sequence of oceanic crust through lavas, dikes, and gabbros is necessary to advance the understanding of the formation and evolution of crust formed at mid-ocean ridges, but it has been an elusive goal of scientific ocean drilling for decades. Recent drilling in the eastern Pacific Ocean in Hole 1256D reached gabbro within seismic layer 2, 1157 meters into crust formed at a superfast spreading rate. The gabbros are the crystallized melt lenses that formed beneath a mid-ocean ridge. The depth at which gabbro was reached confirms predictions extrapolated from seismic experiments at modern mid-ocean ridges: melt lenses occur at shallower depths at faster spreading rates. The gabbros intrude metamorphosed sheeted dikes and have compositions similar to the overlying lavas, precluding formation of the cumulate lower oceanic crust from melt lenses so far penetrated by Hole 1256D.
Year of Publication: 2006
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; 18 Geophysics, Solid-Earth; Cocos Plate; Crust; Deep drilling; Dikes; Downhole methods; Drilling; East Pacific; Expeditions 309/312; Gabbros; Geophysical methods; Geophysical profiles; Geophysical surveys; Guatemala Basin; Igneous rocks; Integrated Ocean Drilling Program; Intrusions; Lava flows; Leg 206; Lithostratigraphy; Melts; Metamorphism; Mid-ocean ridges; Mineral composition; North Pacific; Northeast Pacific; ODP Site 1256; Ocean Drilling Program; Ocean floors; Oceanic crust; Pacific Ocean; Plate tectonics; Plutonic rocks; Plutons; Reflection methods; Sea-floor spreading; Seismic methods; Seismic profiles; Surveys; Volcanic rocks
Coordinates: N064400 N064400 W0915600 W0915600
Record ID: 2006061488
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.