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Unraveling Multiple Thermotectonic Events Accommodated by Crustal‐Scale Faults in Northern Iberia, Spain: Insights From K‐Ar Dating of Clay Gouges
Large‐scale faults in the continental crust are significant features that control the evolution of sedimentary basins and intraplate mountain chains. Deciphering their evolution is a significant task because faults slip and reactivate in a variety of geological settings. In this work, clay gouges of...
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Published in: | Tectonics (Washington, D.C.) D.C.), 2019-10, Vol.38 (10), p.3629-3651 |
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description | Large‐scale faults in the continental crust are significant features that control the evolution of sedimentary basins and intraplate mountain chains. Deciphering their evolution is a significant task because faults slip and reactivate in a variety of geological settings. In this work, clay gouges of two major orogen‐scale, long‐lived faults in northern Iberia, the Río Grío and Vallès‐Penedès Faults, were investigated by X‐ray diffraction and K‐Ar isotopic analysis. Illite polytype determinations of 44 subfractions (from |
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Key Points
Illite polytype determinations allowed discriminating between authigenic/synkinematic and detrital illite crystals
K‐Ar ages of synkinematic illite indicate multiple reactivation for the Río Grío and Vallès‐Penedès Faults during the Mesozoic and Paleogene
Key stages of thermotectonic evolution of the Iberian Plate can be explained within the frame of K‐Ar illite ages</description><identifier>ISSN: 0278-7407</identifier><identifier>EISSN: 1944-9194</identifier><identifier>DOI: 10.1029/2019TC005585</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Clay ; Clay minerals ; Continental crust ; Cretaceous ; Crystals ; Evolution ; Fault lines ; Faults ; Geological time ; Iberian Plate ; Illite ; illite polytype ; Illites ; Jurassic ; K‐Ar geochronology ; Magma ; Mesozoic ; Orogeny ; Paleogene ; Permian ; Rifting ; Río Grío Fault ; Sedimentary basins ; Spain ; Triassic ; Vallès‐Penedès Fault</subject><ispartof>Tectonics (Washington, D.C.), 2019-10, Vol.38 (10), p.3629-3651</ispartof><rights>2019. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3966-909d7ff4f44f4283f19079ce2dbb547909715eca52f6c90e5a69c45a86e02ab13</citedby><cites>FETCH-LOGICAL-a3966-909d7ff4f44f4283f19079ce2dbb547909715eca52f6c90e5a69c45a86e02ab13</cites><orcidid>0000-0002-9743-8695 ; 0000-0002-8383-3328 ; 0000-0003-3652-3527 ; 0000-0002-4665-1373</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2019TC005585$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2019TC005585$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,11513,27923,27924,46467,46891</link.rule.ids></links><search><creatorcontrib>Aldega, L.</creatorcontrib><creatorcontrib>Viola, G.</creatorcontrib><creatorcontrib>Casas‐Sainz, A.</creatorcontrib><creatorcontrib>Marcén, M.</creatorcontrib><creatorcontrib>Román‐Berdiel, T.</creatorcontrib><creatorcontrib>Lelij, R.</creatorcontrib><title>Unraveling Multiple Thermotectonic Events Accommodated by Crustal‐Scale Faults in Northern Iberia, Spain: Insights From K‐Ar Dating of Clay Gouges</title><title>Tectonics (Washington, D.C.)</title><description>Large‐scale faults in the continental crust are significant features that control the evolution of sedimentary basins and intraplate mountain chains. Deciphering their evolution is a significant task because faults slip and reactivate in a variety of geological settings. In this work, clay gouges of two major orogen‐scale, long‐lived faults in northern Iberia, the Río Grío and Vallès‐Penedès Faults, were investigated by X‐ray diffraction and K‐Ar isotopic analysis. Illite polytype determinations of 44 subfractions (from <0.1 to 10 μm) allowed us to discriminate between authigenic/synkinematic illite crystals formed during faulting and detrital illite crystals inherited from the host rock. K‐Ar dating provided a detailed set of ages corresponding to key stages of the thermotectonic evolution of the Iberian Plate: (a) the Permian to Late Triassic extensional/transtensional activity associated to the emplacement of Late Variscan magmatic bodies and hydrothermal mineralizations, (b) the opening of the Central Atlantic Rift during Late Triassic‐Early Jurassic times, (c) the Late Jurassic‐Early Cretaceous rifting that led to the development of Mesozoic extensional/transtensional basins in northern Iberia, (d) the final stage of the anticlockwise rotation of the Iberian Plate with respect to Eurasia and the accommodation of the first Pyrenean compressional pulses in Campanian time, and (e) the positive inversion of Mesozoic extensional basins due to far‐field stresses associated with the Alpine orogeny during the Paleogene. The results highlight that thermotectonic conditions characterized by high‐geothermal gradients strongly favor fault movement and neoformation of clay minerals in fault gouges, regardless of the prevailing tectonic regime.
Key Points
Illite polytype determinations allowed discriminating between authigenic/synkinematic and detrital illite crystals
K‐Ar ages of synkinematic illite indicate multiple reactivation for the Río Grío and Vallès‐Penedès Faults during the Mesozoic and Paleogene
Key stages of thermotectonic evolution of the Iberian Plate can be explained within the frame of K‐Ar illite ages</description><subject>Clay</subject><subject>Clay minerals</subject><subject>Continental crust</subject><subject>Cretaceous</subject><subject>Crystals</subject><subject>Evolution</subject><subject>Fault lines</subject><subject>Faults</subject><subject>Geological time</subject><subject>Iberian Plate</subject><subject>Illite</subject><subject>illite polytype</subject><subject>Illites</subject><subject>Jurassic</subject><subject>K‐Ar geochronology</subject><subject>Magma</subject><subject>Mesozoic</subject><subject>Orogeny</subject><subject>Paleogene</subject><subject>Permian</subject><subject>Rifting</subject><subject>Río Grío Fault</subject><subject>Sedimentary basins</subject><subject>Spain</subject><subject>Triassic</subject><subject>Vallès‐Penedès Fault</subject><issn>0278-7407</issn><issn>1944-9194</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp9kL1OwzAUhS0EEuVn4wEssRKwndiJ2arQQsXf0HSOHNcpRoldbAfUjUdg4gF5EozKwIR0de9wv3OOdAA4wegcI8IvCMK8KhGitKA7YIR5liU87l0wQiQvkjxD-T448P4ZIZxRxkbgc2GceFWdNit4P3RBrzsFqyflehuUDNZoCSevygQPx1LavrdLEdQSNhtYusEH0X29f8yliKqpiHoPtYEP1oVoYeCsUU6LMzhfC20u4cx4vXqKzNTZHt5G5djBKxF-wm0Ly05s4LUdVsofgb1WdF4d_95DsJhOqvImuXu8npXju0SknLGEI77M2zZrszikSFvMUc6lIsumoVke3zmmSgpKWiY5UlQwLjMqCqYQEQ1OD8Hp1nft7MugfKif7eBMjKxJihljBeMsUmdbSjrrvVNtvXa6F25TY1T_NF__bT7i6RZ_053a_MvW1aSsCMYFS78BCuSHlg</recordid><startdate>201910</startdate><enddate>201910</enddate><creator>Aldega, L.</creator><creator>Viola, G.</creator><creator>Casas‐Sainz, A.</creator><creator>Marcén, M.</creator><creator>Román‐Berdiel, T.</creator><creator>Lelij, R.</creator><general>Blackwell Publishing Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><orcidid>https://orcid.org/0000-0002-9743-8695</orcidid><orcidid>https://orcid.org/0000-0002-8383-3328</orcidid><orcidid>https://orcid.org/0000-0003-3652-3527</orcidid><orcidid>https://orcid.org/0000-0002-4665-1373</orcidid></search><sort><creationdate>201910</creationdate><title>Unraveling Multiple Thermotectonic Events Accommodated by Crustal‐Scale Faults in Northern Iberia, Spain: Insights From K‐Ar Dating of Clay Gouges</title><author>Aldega, L. ; Viola, G. ; Casas‐Sainz, A. ; Marcén, M. ; Román‐Berdiel, T. ; Lelij, R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3966-909d7ff4f44f4283f19079ce2dbb547909715eca52f6c90e5a69c45a86e02ab13</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Clay</topic><topic>Clay minerals</topic><topic>Continental crust</topic><topic>Cretaceous</topic><topic>Crystals</topic><topic>Evolution</topic><topic>Fault lines</topic><topic>Faults</topic><topic>Geological time</topic><topic>Iberian Plate</topic><topic>Illite</topic><topic>illite polytype</topic><topic>Illites</topic><topic>Jurassic</topic><topic>K‐Ar geochronology</topic><topic>Magma</topic><topic>Mesozoic</topic><topic>Orogeny</topic><topic>Paleogene</topic><topic>Permian</topic><topic>Rifting</topic><topic>Río Grío Fault</topic><topic>Sedimentary basins</topic><topic>Spain</topic><topic>Triassic</topic><topic>Vallès‐Penedès Fault</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Aldega, L.</creatorcontrib><creatorcontrib>Viola, G.</creatorcontrib><creatorcontrib>Casas‐Sainz, A.</creatorcontrib><creatorcontrib>Marcén, M.</creatorcontrib><creatorcontrib>Román‐Berdiel, T.</creatorcontrib><creatorcontrib>Lelij, R.</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Tectonics (Washington, D.C.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Aldega, L.</au><au>Viola, G.</au><au>Casas‐Sainz, A.</au><au>Marcén, M.</au><au>Román‐Berdiel, T.</au><au>Lelij, R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Unraveling Multiple Thermotectonic Events Accommodated by Crustal‐Scale Faults in Northern Iberia, Spain: Insights From K‐Ar Dating of Clay Gouges</atitle><jtitle>Tectonics (Washington, D.C.)</jtitle><date>2019-10</date><risdate>2019</risdate><volume>38</volume><issue>10</issue><spage>3629</spage><epage>3651</epage><pages>3629-3651</pages><issn>0278-7407</issn><eissn>1944-9194</eissn><abstract>Large‐scale faults in the continental crust are significant features that control the evolution of sedimentary basins and intraplate mountain chains. Deciphering their evolution is a significant task because faults slip and reactivate in a variety of geological settings. In this work, clay gouges of two major orogen‐scale, long‐lived faults in northern Iberia, the Río Grío and Vallès‐Penedès Faults, were investigated by X‐ray diffraction and K‐Ar isotopic analysis. Illite polytype determinations of 44 subfractions (from <0.1 to 10 μm) allowed us to discriminate between authigenic/synkinematic illite crystals formed during faulting and detrital illite crystals inherited from the host rock. K‐Ar dating provided a detailed set of ages corresponding to key stages of the thermotectonic evolution of the Iberian Plate: (a) the Permian to Late Triassic extensional/transtensional activity associated to the emplacement of Late Variscan magmatic bodies and hydrothermal mineralizations, (b) the opening of the Central Atlantic Rift during Late Triassic‐Early Jurassic times, (c) the Late Jurassic‐Early Cretaceous rifting that led to the development of Mesozoic extensional/transtensional basins in northern Iberia, (d) the final stage of the anticlockwise rotation of the Iberian Plate with respect to Eurasia and the accommodation of the first Pyrenean compressional pulses in Campanian time, and (e) the positive inversion of Mesozoic extensional basins due to far‐field stresses associated with the Alpine orogeny during the Paleogene. The results highlight that thermotectonic conditions characterized by high‐geothermal gradients strongly favor fault movement and neoformation of clay minerals in fault gouges, regardless of the prevailing tectonic regime.
Key Points
Illite polytype determinations allowed discriminating between authigenic/synkinematic and detrital illite crystals
K‐Ar ages of synkinematic illite indicate multiple reactivation for the Río Grío and Vallès‐Penedès Faults during the Mesozoic and Paleogene
Key stages of thermotectonic evolution of the Iberian Plate can be explained within the frame of K‐Ar illite ages</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2019TC005585</doi><tpages>23</tpages><orcidid>https://orcid.org/0000-0002-9743-8695</orcidid><orcidid>https://orcid.org/0000-0002-8383-3328</orcidid><orcidid>https://orcid.org/0000-0003-3652-3527</orcidid><orcidid>https://orcid.org/0000-0002-4665-1373</orcidid></addata></record> |
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subjects | Clay Clay minerals Continental crust Cretaceous Crystals Evolution Fault lines Faults Geological time Iberian Plate Illite illite polytype Illites Jurassic K‐Ar geochronology Magma Mesozoic Orogeny Paleogene Permian Rifting Río Grío Fault Sedimentary basins Spain Triassic Vallès‐Penedès Fault |
title | Unraveling Multiple Thermotectonic Events Accommodated by Crustal‐Scale Faults in Northern Iberia, Spain: Insights From K‐Ar Dating of Clay Gouges |
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