Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)

The upper Burdigalian Vilobí Gypsum Unit, located in the Vallès Penedès half-grabben (NE Spain), consists of a 60-m thick succession of laminated-to-banded secondary and primary gypsum affected by Neogene extension in the western part of Mediterranean Sea. This Tertiary extensional event is recorded...

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Autores: Moragas, Mar, Martínez Rodríguez, Cristina, Baqués, Vinyet, Playà, E., Travé, A., Alías, G., Cantarero, I.
Formato: artículo
Fecha de publicación:2013
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/92902
Acesso em linha:http://hdl.handle.net/10261/92902
Access Level:acceso abierto
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spelling Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)Moragas, MarMartínez Rodríguez, CristinaBaqués, VinyetPlayà, E.Travé, A.Alías, G.Cantarero, I.The upper Burdigalian Vilobí Gypsum Unit, located in the Vallès Penedès half-grabben (NE Spain), consists of a 60-m thick succession of laminated-to-banded secondary and primary gypsum affected by Neogene extension in the western part of Mediterranean Sea. This Tertiary extensional event is recorded in the evaporitic unit as six fracture sets (faults and joints), which can be linked with basin-scale deformation stages. All fractures are totally or partially infilled by four types of new gypsum precipitates showing a large variety of textures and microstructures. A structural and petrological study of the unit allows us to establish the following chronology of the fracture formation and infilling processes, from oldest to youngest: (i) S1 and S2 normal faults sets formation and precipitation of sigmoidal gypsum fibres; (ii) S3 joint set formation and growing of perpendicular fibres; (iii) S4 inverse fault development, infilled by oblique gypsum fibres and deformation of the previous fillings; and (iv) S5 and S6 joint formations and later dissolution processes, infilled by macrocrystalline gypsum cements. The fractures provided the pathway for fluid circulation in the Vilobí Unit. The oxygen, sulphur and strontium isotope compositions of the host rocks and the new precipitates in the fractures suggest clear convective recycling processes from the host-sulphates to the fracture infillings, recorded by a general enrichment trend to heavier S-O isotopes, from the oldest precipitates (sigmoidal fibres) to the youngest (macrocrystalline cements) and to the preservation of the strontium signals in the infillings. © 2013 Blackwell Publishing Ltd.The present work was supported by the Spanish Government Projects CGL2009-11096 and CGL2010-18260, and the Grup Consolidat de Recerca Geologia Sedimentaria (Catalan Government) 2009SGR-1451Peer ReviewedBlackwell Publishing2014201420132014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/92902reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1111/gfl.12017info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/929022026-05-22T06:33:51Z
dc.title.none.fl_str_mv Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)
title Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)
spellingShingle Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)
Moragas, Mar
title_short Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)
title_full Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)
title_fullStr Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)
title_full_unstemmed Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)
title_sort Diagenetic evolution of a fractured evaporite deposit (Vilobí Gypsum Unit, Miocene, NE Spain)
dc.creator.none.fl_str_mv Moragas, Mar
Martínez Rodríguez, Cristina
Baqués, Vinyet
Playà, E.
Travé, A.
Alías, G.
Cantarero, I.
author Moragas, Mar
author_facet Moragas, Mar
Martínez Rodríguez, Cristina
Baqués, Vinyet
Playà, E.
Travé, A.
Alías, G.
Cantarero, I.
author_role author
author2 Martínez Rodríguez, Cristina
Baqués, Vinyet
Playà, E.
Travé, A.
Alías, G.
Cantarero, I.
author2_role author
author
author
author
author
author
description The upper Burdigalian Vilobí Gypsum Unit, located in the Vallès Penedès half-grabben (NE Spain), consists of a 60-m thick succession of laminated-to-banded secondary and primary gypsum affected by Neogene extension in the western part of Mediterranean Sea. This Tertiary extensional event is recorded in the evaporitic unit as six fracture sets (faults and joints), which can be linked with basin-scale deformation stages. All fractures are totally or partially infilled by four types of new gypsum precipitates showing a large variety of textures and microstructures. A structural and petrological study of the unit allows us to establish the following chronology of the fracture formation and infilling processes, from oldest to youngest: (i) S1 and S2 normal faults sets formation and precipitation of sigmoidal gypsum fibres; (ii) S3 joint set formation and growing of perpendicular fibres; (iii) S4 inverse fault development, infilled by oblique gypsum fibres and deformation of the previous fillings; and (iv) S5 and S6 joint formations and later dissolution processes, infilled by macrocrystalline gypsum cements. The fractures provided the pathway for fluid circulation in the Vilobí Unit. The oxygen, sulphur and strontium isotope compositions of the host rocks and the new precipitates in the fractures suggest clear convective recycling processes from the host-sulphates to the fracture infillings, recorded by a general enrichment trend to heavier S-O isotopes, from the oldest precipitates (sigmoidal fibres) to the youngest (macrocrystalline cements) and to the preservation of the strontium signals in the infillings. © 2013 Blackwell Publishing Ltd.
publishDate 2013
dc.date.none.fl_str_mv 2013
2014
2014
2014
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/10261/92902
url http://hdl.handle.net/10261/92902
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1111/gfl.12017
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Blackwell Publishing
publisher.none.fl_str_mv Blackwell Publishing
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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