Exhumation of the High‐Pressure Tsäkkok Lens, Swedish Caledonides: Insights From the Structural and White Mica 40Ar/39Ar Geochronological Record
Integrated structural, geochemical, and geochronological investigations were conducted on metasedimentary rocks in the eclogite‐bearing Tsäkkok Lens of the Seve Nappe Complex (Scandinavian Caledonides) to resolve its exhumation history. Three deformation events are defined. D1 is likely related to t...
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| creator | Barnes, C. J. Jeanneret, P. Kullerud, K. Majka, J. Schneider, D. A. Bukała, M. Klonowska, I. |
| description | Integrated structural, geochemical, and geochronological investigations were conducted on metasedimentary rocks in the eclogite‐bearing Tsäkkok Lens of the Seve Nappe Complex (Scandinavian Caledonides) to resolve its exhumation history. Three deformation events are defined. D1 is likely related to the prograde to peak‐metamorphic stages, represented by a locally preserved S1. D2 resulted in vertical shortening and is defined by a pervasive S2 and cm‐/m‐scale F2 closed folds. D2 terminated with Scandian thrusting, which emplaced the overlying Köli Nappe Complex. D3 records NE‐SW shortening and constitutes m‐/km‐scale F3 open folds that deformed the Tsäkkok Lens and Köli Nappe Complex together. In situ white mica 40Ar/39Ar geochronology was conducted on select metasedimentary samples possessing S1 or S2 to resolve the timing of exhumation. Postdecompression cooling of the Tsäkkok Lens is best recorded by samples containing S1 or S2 that yield homogeneous white mica chemistry and 40Ar/39Ar dates. The timing of cooling is resolved to 477.2 ± 4.1 Ma (S1) and 475.3 ± 3.5 Ma (S2). Vertical shortening of the lens during exhumation may have proceeded until 458.1 ± 9.0 Ma. Later‐stage deformation during Scandian thrusting penetrated the Tsäkkok Lens at 429.9 ± 9.0 Ma, or younger. This resulted in noncoaxial deformation of the metasedimentary rocks, producing heterogeneous white mica chemistry and partially reset the older 40Ar/39Ar cooling record. Temperatures for deformation are resolved to the upper greenschist‐lower amphibolite facies. Altogether, the Tsäkkok Lens records rapid exhumation from eclogite‐facies conditions to midcrustal depths or shallower, followed by emplacement of the overlying Köli Nappe Complex.
Key Points
Three deformation events record prograde‐to‐peak metamorphism (D1), exhumation from eclogite‐facies conditions (D2), and postcollisional folding (D3)
White mica 40Ar/39Ar dates evince both closure of 40Ar diffusion and subsequent partial resetting due to deformation during Scandian thrusting
Exhumation of the Tsäkkok Lens from eclogite‐facies to midcrustal/shallow‐crustal conditions was rapid ( |
| doi_str_mv | 10.1029/2020TC006242 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_crist</sourceid><recordid>TN_cdi_cristin_nora_10037_20547</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2427562374</sourcerecordid><originalsourceid>FETCH-LOGICAL-c1348-ce9f715be0f30123f9776bd71d48955432d487b84e93daeaaf5e3ff2684ca90f3</originalsourceid><addsrcrecordid>eNpNkc9O3DAQxq0KJBbojXst9UqK_yWOua2i5Y-0VVFJxdHyJhNiNmtTOxFw4xEq9RX6Jn2TPgkuy4HLzEjz-z6N5kPoiJIvlDB1wggjdUVIwQT7gGZUCZGpVHfQjDBZZlIQuYf2Y7wjhIq8KGbo9-KxnzZmtN5h3-GxB3xhb_t_z7-uAsQ4BcB1_PtnvfZrvAQXj_H1A7Q29rgyA7Te2RbiKb50ManGiM-C37y6XI9hasYpmAEb1-Kb3o6Av9rGYEHm4YSrecDn4Js-eOcHf5s2A_4OjQ_tIdrtzBDh41s_QD_OFnV1kS2_nV9W82XWUC7KrAHVSZqvgHScUMY7JWWxaiVtRanyXHCWBrkqBSjeGjCmy4F3HStK0RiVRAfo09a3CTaO1mnng9GUEC41I7mQifi8Je6D_zlBHPWdn4JLR-n0YpkXjEuRKL6lHuwAT_o-2I0JT8lI_09Fv09F14uqZpTzkr8AbbmB2g</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2427562374</pqid></control><display><type>article</type><title>Exhumation of the High‐Pressure Tsäkkok Lens, Swedish Caledonides: Insights From the Structural and White Mica 40Ar/39Ar Geochronological Record</title><source>NORA - Norwegian Open Research Archives</source><source>Access via Wiley Online Library</source><source>Wiley-Blackwell AGU Digital Library</source><source>EZB-FREE-00999 freely available EZB journals</source><source>Wiley Online Library (Open Access Collection)</source><creator>Barnes, C. J. ; Jeanneret, P. ; Kullerud, K. ; Majka, J. ; Schneider, D. A. ; Bukała, M. ; Klonowska, I.</creator><creatorcontrib>Barnes, C. J. ; Jeanneret, P. ; Kullerud, K. ; Majka, J. ; Schneider, D. A. ; Bukała, M. ; Klonowska, I.</creatorcontrib><description>Integrated structural, geochemical, and geochronological investigations were conducted on metasedimentary rocks in the eclogite‐bearing Tsäkkok Lens of the Seve Nappe Complex (Scandinavian Caledonides) to resolve its exhumation history. Three deformation events are defined. D1 is likely related to the prograde to peak‐metamorphic stages, represented by a locally preserved S1. D2 resulted in vertical shortening and is defined by a pervasive S2 and cm‐/m‐scale F2 closed folds. D2 terminated with Scandian thrusting, which emplaced the overlying Köli Nappe Complex. D3 records NE‐SW shortening and constitutes m‐/km‐scale F3 open folds that deformed the Tsäkkok Lens and Köli Nappe Complex together. In situ white mica 40Ar/39Ar geochronology was conducted on select metasedimentary samples possessing S1 or S2 to resolve the timing of exhumation. Postdecompression cooling of the Tsäkkok Lens is best recorded by samples containing S1 or S2 that yield homogeneous white mica chemistry and 40Ar/39Ar dates. The timing of cooling is resolved to 477.2 ± 4.1 Ma (S1) and 475.3 ± 3.5 Ma (S2). Vertical shortening of the lens during exhumation may have proceeded until 458.1 ± 9.0 Ma. Later‐stage deformation during Scandian thrusting penetrated the Tsäkkok Lens at 429.9 ± 9.0 Ma, or younger. This resulted in noncoaxial deformation of the metasedimentary rocks, producing heterogeneous white mica chemistry and partially reset the older 40Ar/39Ar cooling record. Temperatures for deformation are resolved to the upper greenschist‐lower amphibolite facies. Altogether, the Tsäkkok Lens records rapid exhumation from eclogite‐facies conditions to midcrustal depths or shallower, followed by emplacement of the overlying Köli Nappe Complex.
Key Points
Three deformation events record prograde‐to‐peak metamorphism (D1), exhumation from eclogite‐facies conditions (D2), and postcollisional folding (D3)
White mica 40Ar/39Ar dates evince both closure of 40Ar diffusion and subsequent partial resetting due to deformation during Scandian thrusting
Exhumation of the Tsäkkok Lens from eclogite‐facies to midcrustal/shallow‐crustal conditions was rapid (<10 Myr)</description><identifier>ISSN: 0278-7407</identifier><identifier>ISSN: 1944-9194</identifier><identifier>EISSN: 1944-9194</identifier><identifier>DOI: 10.1029/2020TC006242</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Amphibolite facies ; Amphibolites ; Caledonian orogeny ; Cooling ; Deformation ; Exhumation ; exhumation of high‐pressure rocks ; Geochronology ; Geochronometry ; Geofag: 450 ; Geological time ; Geosciences: 450 ; High pressure ; in situ white mica 40Ar/39Ar geochronology ; Matematikk og Naturvitenskap: 400 ; Mathematics and natural science: 400 ; Records ; Rock ; Rocks ; Sedimentologi: 456 ; Sedimentology: 456 ; Seve Nappe complex ; VDP</subject><ispartof>Tectonics (Washington, D.C.), 2020-07, Vol.39 (7), p.n/a</ispartof><rights>2020. American Geophysical Union. All Rights Reserved.</rights><rights>info:eu-repo/semantics/openAccess</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><orcidid>0000-0003-0597-7999 ; 0000-0003-0260-8872 ; 0000-0001-7045-3150 ; 0000-0002-6792-6866 ; 0000-0001-7346-1770 ; 0000-0002-9665-4927 ; 0000-0001-5889-5394</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%2F2020TC006242$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2020TC006242$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>230,314,780,784,885,1417,1433,11514,26567,27924,27925,45574,45575,46409,46468,46833,46892</link.rule.ids></links><search><creatorcontrib>Barnes, C. J.</creatorcontrib><creatorcontrib>Jeanneret, P.</creatorcontrib><creatorcontrib>Kullerud, K.</creatorcontrib><creatorcontrib>Majka, J.</creatorcontrib><creatorcontrib>Schneider, D. A.</creatorcontrib><creatorcontrib>Bukała, M.</creatorcontrib><creatorcontrib>Klonowska, I.</creatorcontrib><title>Exhumation of the High‐Pressure Tsäkkok Lens, Swedish Caledonides: Insights From the Structural and White Mica 40Ar/39Ar Geochronological Record</title><title>Tectonics (Washington, D.C.)</title><description>Integrated structural, geochemical, and geochronological investigations were conducted on metasedimentary rocks in the eclogite‐bearing Tsäkkok Lens of the Seve Nappe Complex (Scandinavian Caledonides) to resolve its exhumation history. Three deformation events are defined. D1 is likely related to the prograde to peak‐metamorphic stages, represented by a locally preserved S1. D2 resulted in vertical shortening and is defined by a pervasive S2 and cm‐/m‐scale F2 closed folds. D2 terminated with Scandian thrusting, which emplaced the overlying Köli Nappe Complex. D3 records NE‐SW shortening and constitutes m‐/km‐scale F3 open folds that deformed the Tsäkkok Lens and Köli Nappe Complex together. In situ white mica 40Ar/39Ar geochronology was conducted on select metasedimentary samples possessing S1 or S2 to resolve the timing of exhumation. Postdecompression cooling of the Tsäkkok Lens is best recorded by samples containing S1 or S2 that yield homogeneous white mica chemistry and 40Ar/39Ar dates. The timing of cooling is resolved to 477.2 ± 4.1 Ma (S1) and 475.3 ± 3.5 Ma (S2). Vertical shortening of the lens during exhumation may have proceeded until 458.1 ± 9.0 Ma. Later‐stage deformation during Scandian thrusting penetrated the Tsäkkok Lens at 429.9 ± 9.0 Ma, or younger. This resulted in noncoaxial deformation of the metasedimentary rocks, producing heterogeneous white mica chemistry and partially reset the older 40Ar/39Ar cooling record. Temperatures for deformation are resolved to the upper greenschist‐lower amphibolite facies. Altogether, the Tsäkkok Lens records rapid exhumation from eclogite‐facies conditions to midcrustal depths or shallower, followed by emplacement of the overlying Köli Nappe Complex.
Key Points
Three deformation events record prograde‐to‐peak metamorphism (D1), exhumation from eclogite‐facies conditions (D2), and postcollisional folding (D3)
White mica 40Ar/39Ar dates evince both closure of 40Ar diffusion and subsequent partial resetting due to deformation during Scandian thrusting
Exhumation of the Tsäkkok Lens from eclogite‐facies to midcrustal/shallow‐crustal conditions was rapid (<10 Myr)</description><subject>Amphibolite facies</subject><subject>Amphibolites</subject><subject>Caledonian orogeny</subject><subject>Cooling</subject><subject>Deformation</subject><subject>Exhumation</subject><subject>exhumation of high‐pressure rocks</subject><subject>Geochronology</subject><subject>Geochronometry</subject><subject>Geofag: 450</subject><subject>Geological time</subject><subject>Geosciences: 450</subject><subject>High pressure</subject><subject>in situ white mica 40Ar/39Ar geochronology</subject><subject>Matematikk og Naturvitenskap: 400</subject><subject>Mathematics and natural science: 400</subject><subject>Records</subject><subject>Rock</subject><subject>Rocks</subject><subject>Sedimentologi: 456</subject><subject>Sedimentology: 456</subject><subject>Seve Nappe complex</subject><subject>VDP</subject><issn>0278-7407</issn><issn>1944-9194</issn><issn>1944-9194</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>3HK</sourceid><recordid>eNpNkc9O3DAQxq0KJBbojXst9UqK_yWOua2i5Y-0VVFJxdHyJhNiNmtTOxFw4xEq9RX6Jn2TPgkuy4HLzEjz-z6N5kPoiJIvlDB1wggjdUVIwQT7gGZUCZGpVHfQjDBZZlIQuYf2Y7wjhIq8KGbo9-KxnzZmtN5h3-GxB3xhb_t_z7-uAsQ4BcB1_PtnvfZrvAQXj_H1A7Q29rgyA7Te2RbiKb50ManGiM-C37y6XI9hasYpmAEb1-Kb3o6Av9rGYEHm4YSrecDn4Js-eOcHf5s2A_4OjQ_tIdrtzBDh41s_QD_OFnV1kS2_nV9W82XWUC7KrAHVSZqvgHScUMY7JWWxaiVtRanyXHCWBrkqBSjeGjCmy4F3HStK0RiVRAfo09a3CTaO1mnng9GUEC41I7mQifi8Je6D_zlBHPWdn4JLR-n0YpkXjEuRKL6lHuwAT_o-2I0JT8lI_09Fv09F14uqZpTzkr8AbbmB2g</recordid><startdate>202007</startdate><enddate>202007</enddate><creator>Barnes, C. J.</creator><creator>Jeanneret, P.</creator><creator>Kullerud, K.</creator><creator>Majka, J.</creator><creator>Schneider, D. A.</creator><creator>Bukała, M.</creator><creator>Klonowska, I.</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union</general><scope>7TG</scope><scope>7TN</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><scope>3HK</scope><orcidid>https://orcid.org/0000-0003-0597-7999</orcidid><orcidid>https://orcid.org/0000-0003-0260-8872</orcidid><orcidid>https://orcid.org/0000-0001-7045-3150</orcidid><orcidid>https://orcid.org/0000-0002-6792-6866</orcidid><orcidid>https://orcid.org/0000-0001-7346-1770</orcidid><orcidid>https://orcid.org/0000-0002-9665-4927</orcidid><orcidid>https://orcid.org/0000-0001-5889-5394</orcidid></search><sort><creationdate>202007</creationdate><title>Exhumation of the High‐Pressure Tsäkkok Lens, Swedish Caledonides: Insights From the Structural and White Mica 40Ar/39Ar Geochronological Record</title><author>Barnes, C. J. ; Jeanneret, P. ; Kullerud, K. ; Majka, J. ; Schneider, D. A. ; Bukała, M. ; Klonowska, I.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c1348-ce9f715be0f30123f9776bd71d48955432d487b84e93daeaaf5e3ff2684ca90f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Amphibolite facies</topic><topic>Amphibolites</topic><topic>Caledonian orogeny</topic><topic>Cooling</topic><topic>Deformation</topic><topic>Exhumation</topic><topic>exhumation of high‐pressure rocks</topic><topic>Geochronology</topic><topic>Geochronometry</topic><topic>Geofag: 450</topic><topic>Geological time</topic><topic>Geosciences: 450</topic><topic>High pressure</topic><topic>in situ white mica 40Ar/39Ar geochronology</topic><topic>Matematikk og Naturvitenskap: 400</topic><topic>Mathematics and natural science: 400</topic><topic>Records</topic><topic>Rock</topic><topic>Rocks</topic><topic>Sedimentologi: 456</topic><topic>Sedimentology: 456</topic><topic>Seve Nappe complex</topic><topic>VDP</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Barnes, C. J.</creatorcontrib><creatorcontrib>Jeanneret, P.</creatorcontrib><creatorcontrib>Kullerud, K.</creatorcontrib><creatorcontrib>Majka, J.</creatorcontrib><creatorcontrib>Schneider, D. A.</creatorcontrib><creatorcontrib>Bukała, M.</creatorcontrib><creatorcontrib>Klonowska, I.</creatorcontrib><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>NORA - Norwegian Open Research Archives</collection><jtitle>Tectonics (Washington, D.C.)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Barnes, C. J.</au><au>Jeanneret, P.</au><au>Kullerud, K.</au><au>Majka, J.</au><au>Schneider, D. A.</au><au>Bukała, M.</au><au>Klonowska, I.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Exhumation of the High‐Pressure Tsäkkok Lens, Swedish Caledonides: Insights From the Structural and White Mica 40Ar/39Ar Geochronological Record</atitle><jtitle>Tectonics (Washington, D.C.)</jtitle><date>2020-07</date><risdate>2020</risdate><volume>39</volume><issue>7</issue><epage>n/a</epage><issn>0278-7407</issn><issn>1944-9194</issn><eissn>1944-9194</eissn><abstract>Integrated structural, geochemical, and geochronological investigations were conducted on metasedimentary rocks in the eclogite‐bearing Tsäkkok Lens of the Seve Nappe Complex (Scandinavian Caledonides) to resolve its exhumation history. Three deformation events are defined. D1 is likely related to the prograde to peak‐metamorphic stages, represented by a locally preserved S1. D2 resulted in vertical shortening and is defined by a pervasive S2 and cm‐/m‐scale F2 closed folds. D2 terminated with Scandian thrusting, which emplaced the overlying Köli Nappe Complex. D3 records NE‐SW shortening and constitutes m‐/km‐scale F3 open folds that deformed the Tsäkkok Lens and Köli Nappe Complex together. In situ white mica 40Ar/39Ar geochronology was conducted on select metasedimentary samples possessing S1 or S2 to resolve the timing of exhumation. Postdecompression cooling of the Tsäkkok Lens is best recorded by samples containing S1 or S2 that yield homogeneous white mica chemistry and 40Ar/39Ar dates. The timing of cooling is resolved to 477.2 ± 4.1 Ma (S1) and 475.3 ± 3.5 Ma (S2). Vertical shortening of the lens during exhumation may have proceeded until 458.1 ± 9.0 Ma. Later‐stage deformation during Scandian thrusting penetrated the Tsäkkok Lens at 429.9 ± 9.0 Ma, or younger. This resulted in noncoaxial deformation of the metasedimentary rocks, producing heterogeneous white mica chemistry and partially reset the older 40Ar/39Ar cooling record. Temperatures for deformation are resolved to the upper greenschist‐lower amphibolite facies. Altogether, the Tsäkkok Lens records rapid exhumation from eclogite‐facies conditions to midcrustal depths or shallower, followed by emplacement of the overlying Köli Nappe Complex.
Key Points
Three deformation events record prograde‐to‐peak metamorphism (D1), exhumation from eclogite‐facies conditions (D2), and postcollisional folding (D3)
White mica 40Ar/39Ar dates evince both closure of 40Ar diffusion and subsequent partial resetting due to deformation during Scandian thrusting
Exhumation of the Tsäkkok Lens from eclogite‐facies to midcrustal/shallow‐crustal conditions was rapid (<10 Myr)</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2020TC006242</doi><tpages>23</tpages><orcidid>https://orcid.org/0000-0003-0597-7999</orcidid><orcidid>https://orcid.org/0000-0003-0260-8872</orcidid><orcidid>https://orcid.org/0000-0001-7045-3150</orcidid><orcidid>https://orcid.org/0000-0002-6792-6866</orcidid><orcidid>https://orcid.org/0000-0001-7346-1770</orcidid><orcidid>https://orcid.org/0000-0002-9665-4927</orcidid><orcidid>https://orcid.org/0000-0001-5889-5394</orcidid><oa>free_for_read</oa></addata></record> |
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| source | NORA - Norwegian Open Research Archives; Access via Wiley Online Library; Wiley-Blackwell AGU Digital Library; EZB-FREE-00999 freely available EZB journals; Wiley Online Library (Open Access Collection) |
| subjects | Amphibolite facies Amphibolites Caledonian orogeny Cooling Deformation Exhumation exhumation of high‐pressure rocks Geochronology Geochronometry Geofag: 450 Geological time Geosciences: 450 High pressure in situ white mica 40Ar/39Ar geochronology Matematikk og Naturvitenskap: 400 Mathematics and natural science: 400 Records Rock Rocks Sedimentologi: 456 Sedimentology: 456 Seve Nappe complex VDP |
| title | Exhumation of the High‐Pressure Tsäkkok Lens, Swedish Caledonides: Insights From the Structural and White Mica 40Ar/39Ar Geochronological Record |
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