Drilling to gabbro in intact ocean crust

Wilson, D. S. and Teagle, D. A. H. and Alt, J. C. and Banerjee, N. R. and Umino, S. and Miyashita, S. and Acton, G. D. and Anma, R. and Barr, S. R. and Belghoul, A. and Carlut, J. and Christie, D. M. and Coggon, R. M. and Cooper, K. M. and Cordier, C. and Crispini, L. and Durand, S. R. and Einaudi, F. and Galli, L. and Gao, Y. J. and Geldmacher, J. and Gilbert, L. A. and Hayman, N. W. and Herrero-Bervera, E. and Hirano, N. and Holter, S. and Ingle, S. and Jiang, S. J. and Kalberkamp, U. and Kerneklian, M. and Koepke, J. and Laverne, C. and Vasquez, H. L. L. and Maclennan, J. and Morgan, S. and Neo, N. and Nichols, H. J. and Park, S. H. and Reichow, M. K. and Sakuyama, T. and Sano, T. and Sandwell, R. and Scheibner, B. and Smith-Duque, C. E. and Swift, S. A. and Tartarotti, P. and Tikku, A. A. and Tominaga, M. and Veloso, E. A. and Yamasaki, T. and Yamazaki, S. and Ziegler, C. (2006) Drilling to gabbro in intact ocean crust. Science, 312 (5776). pp. 1016-1020. DOI 10.1126/science.1126090

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: 2006 AREP 2006 P IA51
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Science
Volume: 312
Page Range: pp. 1016-1020
Identification Number: 10.1126/science.1126090
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:04
Last Modified: 23 Jul 2013 10:09
URI: http://eprints.esc.cam.ac.uk/id/eprint/807

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