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Science 15 September 1989:
Vol. 245. no. 4923, pp. 1231 - 1233
DOI: 10.1126/science.245.4923.1231
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Articles

Evidence for a Heterogeneous Upper Mantle in the Cabo Ortegal Complex, Spain

JACQUES GIRARDEAU 1, JOSÉ IGNAKI GIL IBARGUCHI 2, and NEJIB BEN JAMAA 1

1 Laboratoire de Pétrologie Physique, Institut de Physique du Globe de Paris-Université Paris 7, 2 Place Jussieu, 75251 Paris Cedex 05, France.
2 Departamento de Mineralogía-Petrología, Universidad del País Vasco, Post Office 644, 48080 Bilbao, Spain.

A well-preserved fragment of a heterogeneous upper mantle is present in the Cabo Ortegal Complex (Spain). This section is made of harzburgite containing a large volume of pyroxenite. The pyroxenite is concentrated in a layer 300 meters thick by 3 kilometers long. In this layer, ultramafic rocks, essentially pyroxenite (massive websterite and clinopyroxenite) and minor dunite, alternate without any rhythmicity. Part of this layering is of primary magmatic origin and possibly resulted from crystallization of magmas in dikes intruded into the host peridotite under mantle conditions.

Submitted on April 5, 1989
Accepted on June 28, 1989


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Cumulate xenoliths in Oligocene alkaline basaltic and lamprophyric dikes from the eastern Rhodopes, Bulgaria: Evidence for the existence of layered plutons under the metamorphic core complexes.
P. Marchev, S. Arai, and O. Vaselli (2006)
Geological Society of America Special Papers 409, 237-258
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Petrogenesis of the Yangkou layered garnet-peridotite complex, Sulu UHP terrane, China.
R. Y. Zhang, J. G. Liou, J.-P. Zheng, W. L. Griffin, T.-F. Yui, and S. Y. O'Reilly (2005)
American Mineralogist 90, 801-813
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Genesis of Pyroxenite-rich Peridotite at Cabo Ortegal (NW Spain): Geochemical and Pb-Sr-Nd Isotope Data.
J. F. SANTOS, U. SCHARER, J. I. GIL IBARGUCHI, and J. GIRARDEAU (2002)
J. Petrology 43, 17-43
   Abstract »    Full Text »    PDF »
Platiniferous chromitite and the tectonic setting of ultramafic rocks in Cabo Ortegal, NW Spain.
T. Moreno, T. MORENO, W. GIBBONS, H. M. PRICHARD, and R. LUNAR (2001)
Journal of the Geological Society 158, 601-614
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Petrogenesis of Corundum-Bearing Mafic Rock in the Horoman Peridotite Complex, Japan.
T. MORISHITA and S. ARAI (2001)
J. Petrology 42, 1279-1299
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