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The relationship between ore deposits and oblique tectonics: the SW Iberian Variscan Belt

By
Fernando Tornos
Fernando Tornos
Instituto Geológico y Minero de España, Azafranal 48. 37001 Salamanca, Spain, f.tornos@igme.es
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César Casquet
César Casquet
Dpt. Petrología. Fac. Geologia. Universidad Complutense Madrid, 28040 Madrid, Spain
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Jorge M. R. S. Relvas
Jorge M. R. S. Relvas
CREMINER/Dpt Geologia, Fac. Ciências, Universidade Lisboa, Edifíco C2, Piso 5, 1749-016 Lisboa, Portugal
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Fernando J. A. S. Barriga
Fernando J. A. S. Barriga
CREMINER/Dpt Geologia, Fac. Ciências, Universidade Lisboa, Edifíco C2, Piso 5, 1749-016 Lisboa, Portugal
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Reinaldo Sáez
Reinaldo Sáez
Dpt. Geología. Fac. Ciencias. Universidad Huelva, Spain
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Published:
January 01, 2002

Abstract

The Ossa Morena and South Portuguese Zones of the Variscan Belt of Iberia are interpreted to represent continental fragments that collided during the Variscan orogeny. Oblique northward subduction of an oceanic realm beneath the Ossa Morena Zone and subsequent collision induced thrusting and left-lateral transcurrent motion of crustal blocks and formation of a variety of ore deposits in both terranes. Most of the mineralization is related to dilational openings within thrusts and shear zones, extensional faults and pull-apart basins. A discontinuous diachronous vertical section from exhalative to deep mesozonal hydrothermal systems of Variscan age can be inferred. Volcanic-hosted massive sulphides are formed in third order pull-apart basins, but deeper related extensional structures are the loci for epithermal Hg, fluorite and Pb–Zn vein systems, Cu–Ni magmatic mineralization and iron-rich calcic skarns. Dilational regions along major shear zones also host mesozonal gold-bearing quartz veins. The overall Variscan mineralization pattern is inferred to be representative of an oblique collisional, (transpressional) geodynamic regime.

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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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