Influence of basement rocks on fluid evolution during multiphase deformation: the example of the Estamariu thrust in the Pyrenean Axial Zone
Calcite veins precipitated in the Estamariu thrust during two tectonic events decipher the temporal and spatial relationships between deformation and fluid migration in a long-lived thrust and determine the influence of basement rocks on the fluid chemistry during deformation. Structural and petrolo...
| Autores: | ; ; ; ; ; |
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| Tipo de documento: | Artigo |
| Estado: | Published version |
| Data de publicação: | 2020 |
| País: | España |
| Recursos: | Universidad de Barcelona |
| Repositório: | Dipòsit Digital de la UB |
| OAI Identifier: | oai:diposit.ub.edu:2445/175907 |
| Acesso em linha: | https://hdl.handle.net/2445/175907 |
| Nível de acesso: | Acesso aberto |
| Palavra-chave: | Sediments (Geologia) Pirineu català (Catalunya) Tectònica Sediments (Geology) Catalonian pyrenees (Catalonia) Tectonics |
| _version_ | 1878741300162854912 |
|---|---|
| author | Muñoz-López, Daniel |
| author2 | Alías López, Gemma Cruset Segura, David Cantero, Irene John, Cédric M. Travé i Herrero, Anna |
| author2_role | author author author author author |
| author_browse | Alías López, Gemma Cantero, Irene Cruset Segura, David John, Cédric M. Muñoz-López, Daniel Travé i Herrero, Anna |
| author_facet | Muñoz-López, Daniel Alías López, Gemma Cruset Segura, David Cantero, Irene John, Cédric M. Travé i Herrero, Anna |
| author_role | author |
| collection | Dipòsit Digital de la UB |
| description | Calcite veins precipitated in the Estamariu thrust during two tectonic events decipher the temporal and spatial relationships between deformation and fluid migration in a long-lived thrust and determine the influence of basement rocks on the fluid chemistry during deformation. Structural and petrological observations constrain the timing of fluid migration and vein formation, whilst geochemical analyses (δ13C, δ18O, 87Sr/86Sr, clumped isotope thermometry and elemental composition) 15 of the related calcite cements and host rocks indicate the fluid origin, pathways and extent of fluid-rock interaction. The first tectonic event, recorded by calcite cements Cc1a and Cc2, is related to the Alpine reactivation of the Estamariu thrust, and is characterized by the migration of meteoric fluids, heated at depth (temperatures between 56 and 98 ºC) and interacted with crystalline basement rocks before upflowing through the thrust zone. During the Neogene extension, the Estamariu thrust was reactivated and normal faults and shear fractures with calcite cements Cc3, Cc4 and Cc5 developed. Cc3 and Cc4 precipitated 20 from hydrothermal fluids (temperatures between 127 and 208 ºC and between 102 and 167 ºC, respectively) derived from crystalline basement rocks and expelled through fault zones during deformation. Cc5 precipitated from low temperature meteoric waters percolating from the surface through small shear fractures. The comparison between our results and already published data in other structures from the Pyrenees suggests that regardless of the origin of the fluids and the tectonic context, basement rocks have a significant influence on the fluid chemistry, particularly on the 87Sr/86Sr ratio. Accordingly, the cements 25 precipitated from fluids interacted with crystalline basement rocks have significantly higher 87Sr/86Sr ratios (> 0.710) with respect to those precipitated from fluids that have interacted with the sedimentary cover (< 0.710). |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_e2bb98b676db833b9a57e6d9a3b6f3b9 |
| institution | Universidad de Barcelona |
| instname_str | Universidad de Barcelona |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:diposit.ub.edu:2445/175907 |
| publishDate | 2020 |
| publishDateSort | 2020 |
| publisher | European Geosciences Union (EGU) |
| publisherStr | European Geosciences Union (EGU) |
| reponame_str | Dipòsit Digital de la UB |
| spelling | Influence of basement rocks on fluid evolution during multiphase deformation: the example of the Estamariu thrust in the Pyrenean Axial Zone Muñoz-López, Daniel Alías López, Gemma Cruset Segura, David Cantero, Irene John, Cédric M. Travé i Herrero, Anna Sediments (Geologia) Pirineu català (Catalunya) Tectònica Sediments (Geology) Catalonian pyrenees (Catalonia) Tectonics Calcite veins precipitated in the Estamariu thrust during two tectonic events decipher the temporal and spatial relationships between deformation and fluid migration in a long-lived thrust and determine the influence of basement rocks on the fluid chemistry during deformation. Structural and petrological observations constrain the timing of fluid migration and vein formation, whilst geochemical analyses (δ13C, δ18O, 87Sr/86Sr, clumped isotope thermometry and elemental composition) 15 of the related calcite cements and host rocks indicate the fluid origin, pathways and extent of fluid-rock interaction. The first tectonic event, recorded by calcite cements Cc1a and Cc2, is related to the Alpine reactivation of the Estamariu thrust, and is characterized by the migration of meteoric fluids, heated at depth (temperatures between 56 and 98 ºC) and interacted with crystalline basement rocks before upflowing through the thrust zone. During the Neogene extension, the Estamariu thrust was reactivated and normal faults and shear fractures with calcite cements Cc3, Cc4 and Cc5 developed. Cc3 and Cc4 precipitated 20 from hydrothermal fluids (temperatures between 127 and 208 ºC and between 102 and 167 ºC, respectively) derived from crystalline basement rocks and expelled through fault zones during deformation. Cc5 precipitated from low temperature meteoric waters percolating from the surface through small shear fractures. The comparison between our results and already published data in other structures from the Pyrenees suggests that regardless of the origin of the fluids and the tectonic context, basement rocks have a significant influence on the fluid chemistry, particularly on the 87Sr/86Sr ratio. Accordingly, the cements 25 precipitated from fluids interacted with crystalline basement rocks have significantly higher 87Sr/86Sr ratios (> 0.710) with respect to those precipitated from fluids that have interacted with the sedimentary cover (< 0.710). European Geosciences Union (EGU) https://hdl.handle.net/2445/175907 |
| spellingShingle | Influence of basement rocks on fluid evolution during multiphase deformation: the example of the Estamariu thrust in the Pyrenean Axial Zone Muñoz-López, Daniel Sediments (Geologia) Pirineu català (Catalunya) Tectònica Sediments (Geology) Catalonian pyrenees (Catalonia) Tectonics |
| status_str | publishedVersion |
| title | Influence of basement rocks on fluid evolution during multiphase deformation: the example of the Estamariu thrust in the Pyrenean Axial Zone |
| title_full | Influence of basement rocks on fluid evolution during multiphase deformation: the example of the Estamariu thrust in the Pyrenean Axial Zone |
| title_fullStr | Influence of basement rocks on fluid evolution during multiphase deformation: the example of the Estamariu thrust in the Pyrenean Axial Zone |
| title_full_unstemmed | Influence of basement rocks on fluid evolution during multiphase deformation: the example of the Estamariu thrust in the Pyrenean Axial Zone |
| title_short | Influence of basement rocks on fluid evolution during multiphase deformation: the example of the Estamariu thrust in the Pyrenean Axial Zone |
| title_sort | Influence of basement rocks on fluid evolution during multiphase deformation: the example of the Estamariu thrust in the Pyrenean Axial Zone |
| topic | Sediments (Geologia) Pirineu català (Catalunya) Tectònica Sediments (Geology) Catalonian pyrenees (Catalonia) Tectonics |
| topic_facet | Sediments (Geologia) Pirineu català (Catalunya) Tectònica Sediments (Geology) Catalonian pyrenees (Catalonia) Tectonics |
| url | https://hdl.handle.net/2445/175907 |