Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)

25 páginas, 11 figuras, 2 tablas

Bibliographic Details
Authors: Orozco Fernández, Miguel, Alonso Chaves, Francisco M., Nieto, F.
Format: article
Publication Date:1998
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/32410
Online Access:http://hdl.handle.net/10261/32410
Access Level:Open access
Keyword:Extension
North facing folds
Alboran
Alpujarras
Betic Cordilleres
Spain
Lithological
Crystallinity
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spelling Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)Orozco Fernández, MiguelAlonso Chaves, Francisco M.Nieto, F.ExtensionNorth facing foldsAlboranAlpujarrasBetic CordilleresSpainLithologicalCrystallinity25 páginas, 11 figuras, 2 tablasDetailed research in the eastern part of the Alpujarras region, Betic Cordilleras, has revealed the existence of large recumbent fold structures involving lithological sequences previously considered to belong to different tectonic units. We have reconstructed a large, complex fold structure (which can be followed axially for over 50 km) based on a careful revision of the boundaries between lithological formations, a structural analysis of the carbonate and metapelite sequences, and the use of mineralogical techniques such as measurements of d001 basal spacing of phengite, paragonite and chlorite, determinations of the illite ‘crystallinity' index (IC) and b0 parameters of mica and chlorite. Structural field data described in this paper include gently dipping axial plane cleavage surfaces, common occurrence of gently dipping boudinage and pinch-and-swell structures and associated sub-orthogonal stretching lineation, similarity in orientation of this stretching lineation with the slip direction of the low-angle normal faults, and close association between north-facing recumbent folds and top-to-the-north low-angle normal faults (the slip direction of the faults being broadly perpendicular to the fold axes). These features clearly indicate that extensional processes played a decisive role in the generation of the Alpujarras large recumbent folds. The development of these recumbent folds probably occurred during the Early to Middle Miocene extensional tectonics that affected the Betic Cordilleras. The formation of large-scale folds in association with normal faulting is consistent with the P–T paths and geochronological data established for the Alpujarride region.This study was supported by grants PB95-1219 and PB92-0020-CO2-01.Peer reviewedElsevier201120111998info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/32410reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/S0040-1951(98)00188-7info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/324102026-05-22T06:33:51Z
dc.title.none.fl_str_mv Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)
title Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)
spellingShingle Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)
Orozco Fernández, Miguel
Extension
North facing folds
Alboran
Alpujarras
Betic Cordilleres
Spain
Lithological
Crystallinity
title_short Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)
title_full Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)
title_fullStr Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)
title_full_unstemmed Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)
title_sort Development of large north-facing folds and their relation to crustal extension in the Alborán domain (Alpujarras region, Betic Cordilleras, Spain)
dc.creator.none.fl_str_mv Orozco Fernández, Miguel
Alonso Chaves, Francisco M.
Nieto, F.
author Orozco Fernández, Miguel
author_facet Orozco Fernández, Miguel
Alonso Chaves, Francisco M.
Nieto, F.
author_role author
author2 Alonso Chaves, Francisco M.
Nieto, F.
author2_role author
author
dc.subject.none.fl_str_mv Extension
North facing folds
Alboran
Alpujarras
Betic Cordilleres
Spain
Lithological
Crystallinity
topic Extension
North facing folds
Alboran
Alpujarras
Betic Cordilleres
Spain
Lithological
Crystallinity
description 25 páginas, 11 figuras, 2 tablas
publishDate 1998
dc.date.none.fl_str_mv 1998
2011
2011
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/32410
url http://hdl.handle.net/10261/32410
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/S0040-1951(98)00188-7
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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