New magnetotelluric data through the boundary between the Ossa Morena and Centroiberian Zones
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| Format: | Artículo científico |
| Langue: | en |
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Universitat de Barcelona
2005
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| _version_ | 1876424801287929856 |
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| author | W. Heise |
| author_facet | W. Heise |
| contents | New magnetotelluric data through the boundary between the Ossa Morena and Centroiberian Zones W. Heise E. Almeida F. Monteiro Santos J. Pous G. Muñoz C. Paz Ciencias de la Tierra Variscan Graphite SW Iberia Magnetotellurics Crustal structure The south-western part of the Iberian Peninsula, including the southern branch of the Iberian Massif, has recentlybeen the subject of several magnetotelluric (MT) studies. This area is made up of three different tectonic terranes:the South Portuguese Zone (SPZ), the Ossa Morena Zone (OMZ) and the Central Iberian Zone (CIZ). Theboundaries between these zones are considered to be sutures, which appear as high electrical conductivity anomaliesin the MT surveys. The OMZ is characterised by a conductive layer at middle-lower crustal levels. Toinvestigate the continuity of this conductive layer into the CIZ, a new MT profile was carried out. This 75-kmlong ENE profile goes through the boundary between the OMZ and the CIZ. The results of a two-dimensionalmagnetotelluric inversion revealed a high-conductivity anomaly in the transition OMZ/CIZ (the so-called CentralUnit), which is interpreted as due to interconnected graphite along shear planes. High-conductivity anomaliesappeared in the middle crust of the CIZ, whose geometry and location are consistent with the conductive layerpreviously found in the OMZ, thus confirming the prolongation of the conductive layer into the CIZ. The top ofthis layer correlated spatially with a broad reflector detected by a seismic profile previously acquired in the samearea. This, together with other geological and petrological evidence, points to a common origin for both features. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530301 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.3 |
| format | Artículo científico |
| id | redalyc_50530301 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universitat de Barcelona |
| spellingShingle | New magnetotelluric data through the boundary between the Ossa Morena and Centroiberian Zones W. Heise Ciencias de la Tierra Variscan Graphite SW Iberia Magnetotellurics Crustal structure New magnetotelluric data through the boundary between the Ossa Morena and Centroiberian Zones W. Heise E. Almeida F. Monteiro Santos J. Pous G. Muñoz C. Paz Ciencias de la Tierra Variscan Graphite SW Iberia Magnetotellurics Crustal structure The south-western part of the Iberian Peninsula, including the southern branch of the Iberian Massif, has recentlybeen the subject of several magnetotelluric (MT) studies. This area is made up of three different tectonic terranes:the South Portuguese Zone (SPZ), the Ossa Morena Zone (OMZ) and the Central Iberian Zone (CIZ). Theboundaries between these zones are considered to be sutures, which appear as high electrical conductivity anomaliesin the MT surveys. The OMZ is characterised by a conductive layer at middle-lower crustal levels. Toinvestigate the continuity of this conductive layer into the CIZ, a new MT profile was carried out. This 75-kmlong ENE profile goes through the boundary between the OMZ and the CIZ. The results of a two-dimensionalmagnetotelluric inversion revealed a high-conductivity anomaly in the transition OMZ/CIZ (the so-called CentralUnit), which is interpreted as due to interconnected graphite along shear planes. High-conductivity anomaliesappeared in the middle crust of the CIZ, whose geometry and location are consistent with the conductive layerpreviously found in the OMZ, thus confirming the prolongation of the conductive layer into the CIZ. The top ofthis layer correlated spatially with a broad reflector detected by a seismic profile previously acquired in the samearea. This, together with other geological and petrological evidence, points to a common origin for both features. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530301 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.3 |
| title | New magnetotelluric data through the boundary between the Ossa Morena and Centroiberian Zones |
| topic | Ciencias de la Tierra Variscan Graphite SW Iberia Magnetotellurics Crustal structure |
| url | https://www.redalyc.org/articulo.oa?id=50530301 |