Drilling to gabbro in intact ocean crust
| Autor: | Carole Cordier, Samantha R Barr, Jeffrey C. Alt, Christine Laverne, Paola Tartarotti, Eugenio A. Veloso, Christa L Ziegler, Florence Einaudi, Sally Morgan, Nicholas W. Hayman, Marc K. Reichow, L. Galli, Gary D Acton, Lisa A. Gilbert, Natsuki Neo, Ryo Anma, Rachel Sandwell, Nobuo Hirano, Sumio Miyashita, Sara Holter, Sedelia Rodriguez Durand, Shusaku Yamazaki, Birgit Scheibner, Rosalind M. Coggon, Laura Crispini, Damon A. H. Teagle, Shijun Jiang, Jörg Geldmacher, Jürgen Koepke, Emilio Herrero-Bervera, Marcie Kerneklian, Holly J. Nichols, Yongjun Gao, A. A. Tikku, Douglas S. Wilson, Stephanie Ingle, Takashi Sano, David M. Christie, Ulrich Kalberkamp, Sung-Hyun Park, Haroldo L. Lledo Vasquez, Akram Belghoul, Toru Yamasaki, Chris E. Smith-Duque, Neil R. Banerjee, Kari M. Cooper, Masako Tominaga, Tetsuya Sakuyama, Susumu Umino, Julie Carlut, Stephen A. Swift, John Maclennan |
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| Přispěvatelé: | Domaines Océaniques (LDO), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2006 |
| Předmět: |
geography
Dike Multidisciplinary geography.geographical_feature_category 010504 meteorology & atmospheric sciences Gabbro Pluton [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Crust 010502 geochemistry & geophysics 01 natural sciences Seafloor spreading Igneous rock Ridge Oceanic crust 14. Life underwater Petrology Geology 0105 earth and related environmental sciences |
| Zdroj: | Sciencemag Sciencemag, 2006, 312 (5776), pp.1016-1020. ⟨10.1126/science.1126090⟩ |
| ISSN: | 1095-9203 |
| DOI: | 10.1126/science.1126090⟩ |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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