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Example of a structurally controlled copper deposit from the Hercynian western High Atlas (Morocco): the High Seksaoua mining district

By
A. Chauvet
A. Chauvet
ISTO, UMR 6113, Université d’Orléans, Bâtiment Géosciences B.P. 6759, 45067 Orléans Cédex 2, France Alain.Chauvet@univ-orleans.fr
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L. Barbanson
L. Barbanson
ISTO, UMR 6113, Université d’Orléans, Bâtiment Géosciences B.P. 6759, 45067 Orléans Cédex 2, France Alain.Chauvet@univ-orleans.fr
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A. Gaouzi
A. Gaouzi
Faculté des Sciences, Université Moulay Ismaïl B.P. 4010 Beni — M’Hamed, Meknès, Morocco
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L. Badra
L. Badra
Faculté des Sciences, Université Moulay Ismaïl B.P. 4010 Beni — M’Hamed, Meknès, Morocco
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J. C. Touray
J. C. Touray
ISTO, UMR 6113, Université d’Orléans, Bâtiment Géosciences B.P. 6759, 45067 Orléans Cédex 2, France Alain.Chauvet@univ-orleans.fr
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S. Oukarou
S. Oukarou
SNAREMA 300 rue Mostapha L. Maâni, Casablanca 01, Morocco
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Published:
January 01, 2002

Abstract

The mineralized district of the High Seksaoua (Western High Atlas, Morocco) is characterized by a lithological succession marked by an alternation of schists and limestones attributed to the Cambrian and affected by at least five deformational events. The copper mineralization herein analysed is systematically localized close to a dolomite/black schist level in which a top-to-the-NNW décollement-type tectonics (Dd) has been identified. We demonstrate that the economic mineralization is a syn-tectonic stockwork formed in response of this top-to-the-NNW shearing event (Dd). This tectonic event can be reasonably correlated with the late Hercynian tectonics responsible, in the same area, for the Tichka granite emplacement at c. 291 ± 5 Ma, also under the control of a NW–SE shortening direction. Indeed, the Tichka granite represents a good candidate to explain the origin of the mineralized fluid. Such an hypothesis is confirmed by the Permo-Triassic age (c. 270 Ma) given by 40Ar/39Ar dating realized on white micas related to the stockwork formation (this study). This important result questions the syn-genetic interpretation accepted until now for this mineralization and allows us to propose a new model of formation for this kind of deposit that could contribute to exploration programmes.

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Contents

Geological Society, London, Special Publications

The Timing and Location of Major Ore Deposits in an Evolving Orogen

D. J. Blundell
D. J. Blundell
Royal Holloway, University of London, UK
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F. Neubauer
F. Neubauer
University of Salzburg, Austria
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A. von Quadt
A. von Quadt
ETH-Z, Zurich, Switzerland
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Geological Society of London
Volume
204
ISBN electronic:
9781862394520
Publication date:
January 01, 2002

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