Drilling to gabbro in intact ocean crust

Douglas S. Wilson, Damon A.H. Teagle, Jeffrey C. Alt, Neil R. Banerjee, Susumu Umino, Sumio Miyashita, Gary D. Acton, Ryo Anma, Samantha R. Barr, Akram Belghoul, Julie Carlut, David M. Christie, Rosalind M. Coggon, Kari M. Cooper, Carole Cordier, Laura Crispini, Sedelia Rodriguez Durand, Florence Einaudi, Laura Galli, Yongjun GaoJörg Geldmacher, Lisa A. Gilbert, Nicholas W. Hayman, Emilio Herrero-Bervera, Nobuo Hirano, Sara Holter, Stephanie Ingle, Shijun Jiang, Ulrich Kalberkamp, Marcie Kerneklian, Jürgen Koepke, Christine Laverne, Haroldo L. Lledo Vasquez, John Maclennan, Sally Morgan, Natsuki Neo, Holly J. Nichols, Sung Hyun Park, Marc K. Reichow, Tetsuya Sakuyama, Takashi Sano, Rachel Sandwell, Birgit Scheibner, Chris E. Smith-Duque, Stephen A. Swift, Paola Tartarotti, Anahita A. Tikku, Masako Tominaga, Eugenio A. Veloso, Toru Yamasaki, Shusaku Yamazaki, Christa Ziegler

Research output: Contribution to journalArticlepeer-review

152 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1016-1020
Number of pages5
JournalScience
Volume312
Issue number5776
DOIs
Publication statusPublished - 2006 May 19

ASJC Scopus subject areas

  • General

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