Exhumation kinematics of the Cycladic Blueschists unit and back-arc extension, insight from the Southern Cyclades (Sikinos and Folegandros Islands, Greece)
Current models for the Oligo‐Miocene postorogenic back‐arc extension of the Aegean domain suggest that stretching is accommodated by two bivergent detachment systems of opposing shear sense. The coexistence in the Eocene of a top‐to‐the‐south thrust at the base of the Cycladic Blueschists unit and t...
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description | Current models for the Oligo‐Miocene postorogenic back‐arc extension of the Aegean domain suggest that stretching is accommodated by two bivergent detachment systems of opposing shear sense. The coexistence in the Eocene of a top‐to‐the‐south thrust at the base of the Cycladic Blueschists unit and top‐to‐the‐north extensional shear zones at the roof raises the problem of differentiating synorogenic and postorogenic deformations with similar directions and shear senses. Based on structural field data, this study shows that the postorogenic deformation recorded in the Southern Cyclades is extremely asymmetric as the Cycladic Blueschists unit is pervasively affected by top‐to‐the‐north shearing deformation distributed on four main shear zones. All activated in greenschist‐facies conditions, some of these shear zones operated in the brittle regime during the final part of the exhumation. The Cycladic Blueschists/Cycladic Basement contact displays clear polyphased deformation with the preservation of top‐to‐the‐south thrust kinematics. Thermal structure of the Cycladic Blueschists unit with regard to position of ductile shear zones was retrieved using the Raman Spectroscopy of Carbonaceous Material peak‐metamorphic temperatures. This study shows a series of major metamorphic gaps accommodating an upward and stepwise decrease of more than 200°C within the Cycladic Blueschists unit. Pressure‐temperature estimates show that only lower parts of the Cycladic Blueschists unit recorded approximately 18–20 kbar for 530°C peak conditions. While flanking the West Cycladic Detachment System, which shows a top‐to‐the‐south shear sense, the Southern Cyclades are dominated by a top‐to‐the‐north noncoaxial shearing. Deformation is therefore genuinely asymmetric in the center of the Aegean domain.
Key Points
Deformation presents a marked top‐to‐the‐north asymmetry
The South Cycladic thrust is strongly reworked by top‐to‐the‐north movements
Deformation thus appears genuinely asymmetric in the center of the Aegean domain |
doi_str_mv | 10.1002/2014TC003664 |
format | Article |
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Key Points
Deformation presents a marked top‐to‐the‐north asymmetry
The South Cycladic thrust is strongly reworked by top‐to‐the‐north movements
Deformation thus appears genuinely asymmetric in the center of the Aegean domain</description><identifier>ISSN: 0278-7407</identifier><identifier>EISSN: 1944-9194</identifier><identifier>DOI: 10.1002/2014TC003664</identifier><identifier>CODEN: TCTNDM</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Aegean domain ; back-arc asymmetry ; Deformation ; Earth Sciences ; Eocene ; extensional shear zones ; Kinematics ; Miocene ; P-T constraints ; Plate tectonics ; Sciences of the Universe ; Seismology ; Southern Cyclades ; Tectonics</subject><ispartof>Tectonics (Washington, D.C.), 2015-01, Vol.34 (1), p.152-185</ispartof><rights>2014. American Geophysical Union. All Rights Reserved.</rights><rights>2015. American Geophysical Union. All Rights Reserved.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c6249-8e704f2c4ea761df06a005d6fde5af13a9e33bf4dcfce688ff03383664b767653</citedby><orcidid>0000-0003-1386-6236 ; 0000-0002-2596-2017 ; 0000-0002-1203-3438</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1002%2F2014TC003664$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1002%2F2014TC003664$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>230,314,778,782,883,1414,1430,4012,11497,27906,27907,27908,45557,45558,46392,46451,46816,46875</link.rule.ids><backlink>$$Uhttps://insu.hal.science/insu-01104890$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Augier, Romain</creatorcontrib><creatorcontrib>Jolivet, Laurent</creatorcontrib><creatorcontrib>Gadenne, Leslie</creatorcontrib><creatorcontrib>Lahfid, Abdeltif</creatorcontrib><creatorcontrib>Driussi, Olivier</creatorcontrib><title>Exhumation kinematics of the Cycladic Blueschists unit and back-arc extension, insight from the Southern Cyclades (Sikinos and Folegandros Islands, Greece)</title><title>Tectonics (Washington, D.C.)</title><addtitle>Tectonics</addtitle><description>Current models for the Oligo‐Miocene postorogenic back‐arc extension of the Aegean domain suggest that stretching is accommodated by two bivergent detachment systems of opposing shear sense. The coexistence in the Eocene of a top‐to‐the‐south thrust at the base of the Cycladic Blueschists unit and top‐to‐the‐north extensional shear zones at the roof raises the problem of differentiating synorogenic and postorogenic deformations with similar directions and shear senses. Based on structural field data, this study shows that the postorogenic deformation recorded in the Southern Cyclades is extremely asymmetric as the Cycladic Blueschists unit is pervasively affected by top‐to‐the‐north shearing deformation distributed on four main shear zones. All activated in greenschist‐facies conditions, some of these shear zones operated in the brittle regime during the final part of the exhumation. The Cycladic Blueschists/Cycladic Basement contact displays clear polyphased deformation with the preservation of top‐to‐the‐south thrust kinematics. Thermal structure of the Cycladic Blueschists unit with regard to position of ductile shear zones was retrieved using the Raman Spectroscopy of Carbonaceous Material peak‐metamorphic temperatures. This study shows a series of major metamorphic gaps accommodating an upward and stepwise decrease of more than 200°C within the Cycladic Blueschists unit. Pressure‐temperature estimates show that only lower parts of the Cycladic Blueschists unit recorded approximately 18–20 kbar for 530°C peak conditions. While flanking the West Cycladic Detachment System, which shows a top‐to‐the‐south shear sense, the Southern Cyclades are dominated by a top‐to‐the‐north noncoaxial shearing. Deformation is therefore genuinely asymmetric in the center of the Aegean domain.
Key Points
Deformation presents a marked top‐to‐the‐north asymmetry
The South Cycladic thrust is strongly reworked by top‐to‐the‐north movements
Deformation thus appears genuinely asymmetric in the center of the Aegean domain</description><subject>Aegean domain</subject><subject>back-arc asymmetry</subject><subject>Deformation</subject><subject>Earth Sciences</subject><subject>Eocene</subject><subject>extensional shear zones</subject><subject>Kinematics</subject><subject>Miocene</subject><subject>P-T constraints</subject><subject>Plate tectonics</subject><subject>Sciences of the Universe</subject><subject>Seismology</subject><subject>Southern Cyclades</subject><subject>Tectonics</subject><issn>0278-7407</issn><issn>1944-9194</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNpdkV1v0zAUhiMEEmVwxw-wxM2YFvBX7ORyRF07rQKxFbi0XOd48ZrGw05G-1v4s3PXaULc-BxLz3nf85Fl7wn-RDCmnykmfFljzITgL7IJqTjPq_S-zCaYyjKXHMvX2ZsYb3EiCyEm2d_pth03enC-R2vXwz41EXmLhhZQvTOdbpxBX7oRomldHCIaezcg3Tdopc0618Eg2A7QxyRxilyKN-2AbPCbR4lrP6YQ-ictiOj42iUnHx81zn0HNykJ6X8Ru5TFUzQLAAY-vs1eWd1FePcUj7If59NlPc8X32YX9dkiN4LyKi9BYm6p4aClII3FQmNcNMI2UGhLmK6AsZXljbEGRFlaixkr9ztaSSFFwY6yk4Nuqzt1F9xGh53y2qn52UKlgUaFCcG8rPA9SfDxAb4L_ndayqA2LhroUuvgx6iIFGUhJaV79MN_6K0fQ59GUUQUhWA0mSeKHag_roPdsz_Ban9T9e9N1XJaLymmrEpV-aEqnQS2z1U6rJWQTBbq19eZmtMrfvX950Jdsgc5AaXK</recordid><startdate>201501</startdate><enddate>201501</enddate><creator>Augier, Romain</creator><creator>Jolivet, Laurent</creator><creator>Gadenne, Leslie</creator><creator>Lahfid, Abdeltif</creator><creator>Driussi, Olivier</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union (AGU)</general><scope>BSCLL</scope><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0003-1386-6236</orcidid><orcidid>https://orcid.org/0000-0002-2596-2017</orcidid><orcidid>https://orcid.org/0000-0002-1203-3438</orcidid></search><sort><creationdate>201501</creationdate><title>Exhumation kinematics of the Cycladic Blueschists unit and back-arc extension, insight from the Southern Cyclades (Sikinos and Folegandros Islands, Greece)</title><author>Augier, Romain ; Jolivet, Laurent ; Gadenne, Leslie ; Lahfid, Abdeltif ; Driussi, Olivier</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c6249-8e704f2c4ea761df06a005d6fde5af13a9e33bf4dcfce688ff03383664b767653</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Aegean domain</topic><topic>back-arc asymmetry</topic><topic>Deformation</topic><topic>Earth Sciences</topic><topic>Eocene</topic><topic>extensional shear zones</topic><topic>Kinematics</topic><topic>Miocene</topic><topic>P-T constraints</topic><topic>Plate tectonics</topic><topic>Sciences of the Universe</topic><topic>Seismology</topic><topic>Southern Cyclades</topic><topic>Tectonics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Augier, Romain</creatorcontrib><creatorcontrib>Jolivet, Laurent</creatorcontrib><creatorcontrib>Gadenne, Leslie</creatorcontrib><creatorcontrib>Lahfid, Abdeltif</creatorcontrib><creatorcontrib>Driussi, Olivier</creatorcontrib><collection>Istex</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><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Tectonics (Washington, D.C.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Augier, Romain</au><au>Jolivet, Laurent</au><au>Gadenne, Leslie</au><au>Lahfid, Abdeltif</au><au>Driussi, Olivier</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Exhumation kinematics of the Cycladic Blueschists unit and back-arc extension, insight from the Southern Cyclades (Sikinos and Folegandros Islands, Greece)</atitle><jtitle>Tectonics (Washington, D.C.)</jtitle><addtitle>Tectonics</addtitle><date>2015-01</date><risdate>2015</risdate><volume>34</volume><issue>1</issue><spage>152</spage><epage>185</epage><pages>152-185</pages><issn>0278-7407</issn><eissn>1944-9194</eissn><coden>TCTNDM</coden><abstract>Current models for the Oligo‐Miocene postorogenic back‐arc extension of the Aegean domain suggest that stretching is accommodated by two bivergent detachment systems of opposing shear sense. The coexistence in the Eocene of a top‐to‐the‐south thrust at the base of the Cycladic Blueschists unit and top‐to‐the‐north extensional shear zones at the roof raises the problem of differentiating synorogenic and postorogenic deformations with similar directions and shear senses. Based on structural field data, this study shows that the postorogenic deformation recorded in the Southern Cyclades is extremely asymmetric as the Cycladic Blueschists unit is pervasively affected by top‐to‐the‐north shearing deformation distributed on four main shear zones. All activated in greenschist‐facies conditions, some of these shear zones operated in the brittle regime during the final part of the exhumation. The Cycladic Blueschists/Cycladic Basement contact displays clear polyphased deformation with the preservation of top‐to‐the‐south thrust kinematics. Thermal structure of the Cycladic Blueschists unit with regard to position of ductile shear zones was retrieved using the Raman Spectroscopy of Carbonaceous Material peak‐metamorphic temperatures. This study shows a series of major metamorphic gaps accommodating an upward and stepwise decrease of more than 200°C within the Cycladic Blueschists unit. Pressure‐temperature estimates show that only lower parts of the Cycladic Blueschists unit recorded approximately 18–20 kbar for 530°C peak conditions. While flanking the West Cycladic Detachment System, which shows a top‐to‐the‐south shear sense, the Southern Cyclades are dominated by a top‐to‐the‐north noncoaxial shearing. Deformation is therefore genuinely asymmetric in the center of the Aegean domain.
Key Points
Deformation presents a marked top‐to‐the‐north asymmetry
The South Cycladic thrust is strongly reworked by top‐to‐the‐north movements
Deformation thus appears genuinely asymmetric in the center of the Aegean domain</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2014TC003664</doi><tpages>34</tpages><orcidid>https://orcid.org/0000-0003-1386-6236</orcidid><orcidid>https://orcid.org/0000-0002-2596-2017</orcidid><orcidid>https://orcid.org/0000-0002-1203-3438</orcidid><oa>free_for_read</oa></addata></record> |
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source | Wiley Online Library Journals Frontfile Complete; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Wiley Free Content; Wiley-Blackwell AGU Digital Library |
subjects | Aegean domain back-arc asymmetry Deformation Earth Sciences Eocene extensional shear zones Kinematics Miocene P-T constraints Plate tectonics Sciences of the Universe Seismology Southern Cyclades Tectonics |
title | Exhumation kinematics of the Cycladic Blueschists unit and back-arc extension, insight from the Southern Cyclades (Sikinos and Folegandros Islands, Greece) |
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