The metallogenic evolution of the Ossa-Morena Zone
[EN] The Ossa-Morena Zone contains abundant ore deposits and showings for the most part formed during the Cadomian and the Variscan orogenic cycles, and the intermediate rifting and stable platform stages. Despite major tectonic dismembering during Variscan rejuvenation which masked older geologic f...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2004 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/5514 |
| Acceso en línea: | http://hdl.handle.net/10261/5514 |
| Access Level: | acceso abierto |
| Palabra clave: | Ore deposits Transpression Orogenic rejuvenation Ossa-Morena Zone Iberia Depósitos minerales Transpresión Rejuvenecimiento orogénico Zona Ossa Morena Jazigos minerais Transpressão Rejuvenescimento orogénico |
| Sumario: | [EN] The Ossa-Morena Zone contains abundant ore deposits and showings for the most part formed during the Cadomian and the Variscan orogenic cycles, and the intermediate rifting and stable platform stages. Despite major tectonic dismembering during Variscan rejuvenation which masked older geologic features, Cadomian mineralisation is comparable to active arc-related ore deposits, i.e., volcanic-hosted massive sulphides, barite and Zn-Pb SEDEX deposits and some minor porphyry copper-like mineralisation. Post-Cadomian Early Paleozoic ore deposits are scarce. Most are iron oxide stratabound deposits probably related to the Early Cambrian rifting volcanism. Variscan tectonic, metamorphic and magmatic activity led to the formation of very different types of mineralisation, including syn-metamorphic and perigranitic base metal-bearing veins, small volcanic-hosted polymetallic massive sulphide deposits, iron oxide replacements and skarns, magnetite and Cu-Ni magmatic ore bodies and Sn-W veins and replacements. Orogenic Au mineralisation is of imprecise age and could be either Variscan or Cadomian. Relatively low temperature Late Variscan hydrothermal activity is believed to be responsible for the formation of abundant Pb-Zn- and Cu-dominated lodes in different geological settings, Hg replacements and uranium-bearing veins. As a whole, the diverse Variscan metallogenesis of the OMZ is interpreted as a vertical continuum in a continental crust undergoing transpressional strain. During the Variscan cycle, the OMZ first was an active continental margin –and magmatic arc-, that evolved into a collided zone after amalgamation to the South Portuguese Zone terrane. Furthermore, the recently discovered large mafic-ultramafic body set in the middle crust, probably played a key role in Variscan metallogenesis. |
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