Sampling and observation of oceanic mantle and crust on gorringe bank

Type Article
Date 1978
Language English
Author(s) Auzende Jean-Marie1, Olivet Jean-Louis1, Charvet J2, Le Lann Alain3, Le Pichon Xavier4, Monteiro Jh5, Nicolas Anne6, Ribeiro A7
Affiliation(s) 1 : Centre Océanologique de Bretagne, B.P. 337, 29273 Brest cedex, France
2 : UNIV LILLE 1,GEOL DYNAM LAB,F-59650 VILLENEUVE DASCQ,FRANCE.
3 : UNIV BRETAGNE OCCIDENTALE,OCEANOL & GEODYNAM LAB,F-29283 BREST,FRANCE.
4 : CTR NATL EXPLORAT OCEANS,F-75016 PARIS,FRANCE.
5 : UNIV NANTES,TECTONOPHYS LAB,F-44037 NANTES,FRANCE.
6 : Servico de Fomento Mineiro, Arquivo de Amostras Castan Heira de Ribatejo, Portugal
7 : SERV GEOL PORTUGAL,LISBONNE,PORTUGAL.
Source Nature (0028-0836) (Macmillan Magazines Ltd), 1978 , Vol. 273 , N. 5657 , P. 45-49
DOI 10.1038/273045a0
WOS© Times Cited 48
Abstract THE structure and nature of the uppermost oceanic mantle and crust has been, and still is, the subject of a major international research effort . Yet the direct field evidence known to us on this subject, whether obtained by drilling in the I.P.O.D. oceanic crust programme² or by submersible surveying in the Famous programme , has been either very incomplete or limited to the upper part of layer 2. As a result, the problem of the comparison between ophiolites and oceanic crust is still debated . We report here the preliminary results of an in situ geological survey in which we have sampled and observed what we believe to be an almost complete geological section starting a few kilometres below the Moho discontinuity and ending in the upper part of layer 2 (ref.4). This section outcrops on the flanks of Gorringe Bank, which is a ridge 200 km long and 60 km wide between Tagus and Horseshoe abyssal plains in the Atlantic ocean, South West of Cape Saint Vincent, Portugal (Fig. 1) (Fig. 1). [NOT CONTROLLED OCR]
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