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Permian to Triassic protolith ages of type locality eclogites in the Eastern Alps; implications for the opening of the Meliata back-arc basin
The Austroalpine domain contains the type locality of eclogites, but their protolith age is unknown except for a Permian metagabbro. Therefore, we studied the non-gabbroic eclogites from the Saualpe-Koralpe Complex (SKC) representing meta-basalts within a coherent continental rift fragment subducted...
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| Published in: | Geology (Boulder) 2023-06, Vol.51 (6), p.537-542 |
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| creator | Chang, Ruihong Neubauer, Franz Liu Yongjiang, Liu Yongjiang Genser, Johann Guan Qingbin, Guan Qingbin Huang Qianwen, Huang Qianwen Yuan Sihua, Yuan Sihua |
| description | The Austroalpine domain contains the type locality of eclogites, but their protolith age is unknown except for a Permian metagabbro. Therefore, we studied the non-gabbroic eclogites from the Saualpe-Koralpe Complex (SKC) representing meta-basalts within a coherent continental rift fragment subducted during the Cretaceous. Zircon laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating revealed protolith ages of 283 ± 5 Ma, 255 ± 3 Ma, 251 ± 3 Ma, and 241 ± 3 Ma. Magmatic zircons exhibit 176Hf/177Hf ratios of 0.282935-0.283090 and juvenile εHf(t) values of +10 to +17.4. Typical normal mid-oceanic ridge basalt (N-MORB) geochemistry is established. The SKC host metasedimentary rocks are interpreted as Variscan continental crust close to the margin of the oceanic Meliata basin and were affected by Permian metamorphism. Metamorphic zircon of one SKC eclogite yields an age of 87-93 Ma. These results combined with previous data are used to present a new model for the tectonic evolution of the distal Austroalpine unit associated with the Meliata Ocean in a Wilson cycle: The SKC represents a distal continental margin during Permian to Middle Triassic rifting, which was intruded by few gabbro bodies and numerous basaltic sills and mostly Permian pegmatites. In contrast, structurally separated thick Triassic sedimentary cover successions of the Austroalpine domain lack any magmatism, excluding SKC as Triassic basement of the sedimentary cover successions. The present eclogite-bearing piece of continental crust adjacent to the Meliata oceanic lithosphere was subducted to mantle depth during Late Cretaceous and then exhumed. |
| doi_str_mv | 10.1130/G50903.1 |
| format | article |
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Therefore, we studied the non-gabbroic eclogites from the Saualpe-Koralpe Complex (SKC) representing meta-basalts within a coherent continental rift fragment subducted during the Cretaceous. Zircon laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating revealed protolith ages of 283 ± 5 Ma, 255 ± 3 Ma, 251 ± 3 Ma, and 241 ± 3 Ma. Magmatic zircons exhibit 176Hf/177Hf ratios of 0.282935-0.283090 and juvenile εHf(t) values of +10 to +17.4. Typical normal mid-oceanic ridge basalt (N-MORB) geochemistry is established. The SKC host metasedimentary rocks are interpreted as Variscan continental crust close to the margin of the oceanic Meliata basin and were affected by Permian metamorphism. Metamorphic zircon of one SKC eclogite yields an age of 87-93 Ma. These results combined with previous data are used to present a new model for the tectonic evolution of the distal Austroalpine unit associated with the Meliata Ocean in a Wilson cycle: The SKC represents a distal continental margin during Permian to Middle Triassic rifting, which was intruded by few gabbro bodies and numerous basaltic sills and mostly Permian pegmatites. In contrast, structurally separated thick Triassic sedimentary cover successions of the Austroalpine domain lack any magmatism, excluding SKC as Triassic basement of the sedimentary cover successions. The present eclogite-bearing piece of continental crust adjacent to the Meliata oceanic lithosphere was subducted to mantle depth during Late Cretaceous and then exhumed.</description><identifier>ISSN: 0091-7613</identifier><identifier>EISSN: 1943-2682</identifier><identifier>DOI: 10.1130/G50903.1</identifier><language>eng</language><publisher>Boulder: Geological Society of America (GSA)</publisher><subject>Ablation ; Alps ; back-arc basins ; Basalt ; basalts ; basins ; Continental crust ; Continental margins ; Cretaceous ; crust ; Dating ; Domains ; Eastern Alps ; Eclogite ; Europe ; Gabbro ; Geochemistry ; Geochronometry ; Geology ; hafnium ; Hafnium isotopes ; Hf-177/Hf-176 ; ICP mass spectra ; igneous and metamorphic rocks ; igneous rocks ; Inductively coupled plasma mass spectrometry ; isotope ratios ; isotopes ; Juveniles ; Laser ablation ; laser methods ; Lithosphere ; Magma ; mass spectra ; Mass spectrometry ; Mass spectroscopy ; metabasalt ; metagabbro ; metaigneous rocks ; metals ; metamorphic rocks ; Metamorphism ; metasedimentary rocks ; mid-ocean ridge basalts ; nesosilicates ; orthosilicates ; Paleozoic ; Permian ; Petrology ; protoliths ; Radiometric dating ; Rifting ; Saualpe-Koralpe Complex ; silicates ; Sills ; spectra ; stable isotopes ; Subduction (geology) ; Tectonics ; Triassic ; U/Pb ; volcanic rocks ; Zircon ; zircon group</subject><ispartof>Geology (Boulder), 2023-06, Vol.51 (6), p.537-542</ispartof><rights>GeoRef, Copyright 2023, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Reference includes data supplied by the Geological Society of America @Boulder, CO @USA @United States</rights><rights>Copyright Geological Society of America Jun 1, 2023</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a348t-b8d36c156945834270272d6f2a19ee56ccc92edccedc1f6855cb156bc9cf3f853</citedby><cites>FETCH-LOGICAL-a348t-b8d36c156945834270272d6f2a19ee56ccc92edccedc1f6855cb156bc9cf3f853</cites><orcidid>0000-0002-1326-3622</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>315,786,790,27957,27958,38916</link.rule.ids></links><search><creatorcontrib>Chang, Ruihong</creatorcontrib><creatorcontrib>Neubauer, Franz</creatorcontrib><creatorcontrib>Liu Yongjiang, Liu Yongjiang</creatorcontrib><creatorcontrib>Genser, Johann</creatorcontrib><creatorcontrib>Guan Qingbin, Guan Qingbin</creatorcontrib><creatorcontrib>Huang Qianwen, Huang Qianwen</creatorcontrib><creatorcontrib>Yuan Sihua, Yuan Sihua</creatorcontrib><title>Permian to Triassic protolith ages of type locality eclogites in the Eastern Alps; implications for the opening of the Meliata back-arc basin</title><title>Geology (Boulder)</title><description>The Austroalpine domain contains the type locality of eclogites, but their protolith age is unknown except for a Permian metagabbro. Therefore, we studied the non-gabbroic eclogites from the Saualpe-Koralpe Complex (SKC) representing meta-basalts within a coherent continental rift fragment subducted during the Cretaceous. Zircon laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating revealed protolith ages of 283 ± 5 Ma, 255 ± 3 Ma, 251 ± 3 Ma, and 241 ± 3 Ma. Magmatic zircons exhibit 176Hf/177Hf ratios of 0.282935-0.283090 and juvenile εHf(t) values of +10 to +17.4. Typical normal mid-oceanic ridge basalt (N-MORB) geochemistry is established. The SKC host metasedimentary rocks are interpreted as Variscan continental crust close to the margin of the oceanic Meliata basin and were affected by Permian metamorphism. Metamorphic zircon of one SKC eclogite yields an age of 87-93 Ma. These results combined with previous data are used to present a new model for the tectonic evolution of the distal Austroalpine unit associated with the Meliata Ocean in a Wilson cycle: The SKC represents a distal continental margin during Permian to Middle Triassic rifting, which was intruded by few gabbro bodies and numerous basaltic sills and mostly Permian pegmatites. In contrast, structurally separated thick Triassic sedimentary cover successions of the Austroalpine domain lack any magmatism, excluding SKC as Triassic basement of the sedimentary cover successions. The present eclogite-bearing piece of continental crust adjacent to the Meliata oceanic lithosphere was subducted to mantle depth during Late Cretaceous and then exhumed.</description><subject>Ablation</subject><subject>Alps</subject><subject>back-arc basins</subject><subject>Basalt</subject><subject>basalts</subject><subject>basins</subject><subject>Continental crust</subject><subject>Continental margins</subject><subject>Cretaceous</subject><subject>crust</subject><subject>Dating</subject><subject>Domains</subject><subject>Eastern Alps</subject><subject>Eclogite</subject><subject>Europe</subject><subject>Gabbro</subject><subject>Geochemistry</subject><subject>Geochronometry</subject><subject>Geology</subject><subject>hafnium</subject><subject>Hafnium isotopes</subject><subject>Hf-177/Hf-176</subject><subject>ICP mass spectra</subject><subject>igneous and metamorphic rocks</subject><subject>igneous rocks</subject><subject>Inductively coupled plasma mass spectrometry</subject><subject>isotope ratios</subject><subject>isotopes</subject><subject>Juveniles</subject><subject>Laser ablation</subject><subject>laser methods</subject><subject>Lithosphere</subject><subject>Magma</subject><subject>mass spectra</subject><subject>Mass spectrometry</subject><subject>Mass spectroscopy</subject><subject>metabasalt</subject><subject>metagabbro</subject><subject>metaigneous rocks</subject><subject>metals</subject><subject>metamorphic rocks</subject><subject>Metamorphism</subject><subject>metasedimentary rocks</subject><subject>mid-ocean ridge basalts</subject><subject>nesosilicates</subject><subject>orthosilicates</subject><subject>Paleozoic</subject><subject>Permian</subject><subject>Petrology</subject><subject>protoliths</subject><subject>Radiometric dating</subject><subject>Rifting</subject><subject>Saualpe-Koralpe Complex</subject><subject>silicates</subject><subject>Sills</subject><subject>spectra</subject><subject>stable isotopes</subject><subject>Subduction (geology)</subject><subject>Tectonics</subject><subject>Triassic</subject><subject>U/Pb</subject><subject>volcanic rocks</subject><subject>Zircon</subject><subject>zircon group</subject><issn>0091-7613</issn><issn>1943-2682</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNpNkE1LAzEQhoMoWKvgTwh4EWRrPvYji6dSahUUPdTzkp3OtqnbzZqkSH-E_9m09eBhmMzkmXeYl5BrzkacS3Y_y1jJ5IifkAEvU5mIXIlTMmCs5EmRc3lOLrxfM8bTrFAD8vOObmN0R4Olc2e09wZo72ywrQkrqpfoqW1o2PVIWws6dncUobVLE-KXiYMrpFPtA7qOjtveP1Cz6VsDOhjbedpYd0Bsj53plgexWL5ia3TQtNbwmWgH8eFNd0nOGt16vPrLQ_LxOJ1PnpKXt9nzZPySaJmqkNRqIXPgWV6mmZKpKJgoxCJvhOYlYpYDQClwARCDN7nKMqgjXUMJjWxUJofk5qgbL_3aog_V2m5dF1dWQgmeRrNSHqnbIwXOeu-wqXpnNtrtKs6qvdnV0exqj94d0SVaDwY7wG_r2sU_XSZkFaMolfwFrSOBoA</recordid><startdate>20230601</startdate><enddate>20230601</enddate><creator>Chang, Ruihong</creator><creator>Neubauer, Franz</creator><creator>Liu Yongjiang, Liu Yongjiang</creator><creator>Genser, Johann</creator><creator>Guan Qingbin, Guan Qingbin</creator><creator>Huang Qianwen, Huang Qianwen</creator><creator>Yuan Sihua, Yuan Sihua</creator><general>Geological Society of America (GSA)</general><general>Geological Society of America</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope><orcidid>https://orcid.org/0000-0002-1326-3622</orcidid></search><sort><creationdate>20230601</creationdate><title>Permian to Triassic protolith ages of type locality eclogites in the Eastern Alps; implications for the opening of the Meliata back-arc basin</title><author>Chang, Ruihong ; Neubauer, Franz ; Liu Yongjiang, Liu Yongjiang ; Genser, Johann ; Guan Qingbin, Guan Qingbin ; Huang Qianwen, Huang Qianwen ; Yuan Sihua, Yuan Sihua</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a348t-b8d36c156945834270272d6f2a19ee56ccc92edccedc1f6855cb156bc9cf3f853</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>Ablation</topic><topic>Alps</topic><topic>back-arc basins</topic><topic>Basalt</topic><topic>basalts</topic><topic>basins</topic><topic>Continental crust</topic><topic>Continental margins</topic><topic>Cretaceous</topic><topic>crust</topic><topic>Dating</topic><topic>Domains</topic><topic>Eastern Alps</topic><topic>Eclogite</topic><topic>Europe</topic><topic>Gabbro</topic><topic>Geochemistry</topic><topic>Geochronometry</topic><topic>Geology</topic><topic>hafnium</topic><topic>Hafnium isotopes</topic><topic>Hf-177/Hf-176</topic><topic>ICP mass spectra</topic><topic>igneous and metamorphic rocks</topic><topic>igneous rocks</topic><topic>Inductively coupled plasma mass spectrometry</topic><topic>isotope ratios</topic><topic>isotopes</topic><topic>Juveniles</topic><topic>Laser ablation</topic><topic>laser methods</topic><topic>Lithosphere</topic><topic>Magma</topic><topic>mass spectra</topic><topic>Mass spectrometry</topic><topic>Mass spectroscopy</topic><topic>metabasalt</topic><topic>metagabbro</topic><topic>metaigneous rocks</topic><topic>metals</topic><topic>metamorphic rocks</topic><topic>Metamorphism</topic><topic>metasedimentary rocks</topic><topic>mid-ocean ridge basalts</topic><topic>nesosilicates</topic><topic>orthosilicates</topic><topic>Paleozoic</topic><topic>Permian</topic><topic>Petrology</topic><topic>protoliths</topic><topic>Radiometric dating</topic><topic>Rifting</topic><topic>Saualpe-Koralpe Complex</topic><topic>silicates</topic><topic>Sills</topic><topic>spectra</topic><topic>stable isotopes</topic><topic>Subduction (geology)</topic><topic>Tectonics</topic><topic>Triassic</topic><topic>U/Pb</topic><topic>volcanic rocks</topic><topic>Zircon</topic><topic>zircon group</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chang, Ruihong</creatorcontrib><creatorcontrib>Neubauer, Franz</creatorcontrib><creatorcontrib>Liu Yongjiang, Liu Yongjiang</creatorcontrib><creatorcontrib>Genser, Johann</creatorcontrib><creatorcontrib>Guan Qingbin, Guan Qingbin</creatorcontrib><creatorcontrib>Huang Qianwen, Huang Qianwen</creatorcontrib><creatorcontrib>Yuan Sihua, Yuan Sihua</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</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>Geology (Boulder)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chang, Ruihong</au><au>Neubauer, Franz</au><au>Liu Yongjiang, Liu Yongjiang</au><au>Genser, Johann</au><au>Guan Qingbin, Guan Qingbin</au><au>Huang Qianwen, Huang Qianwen</au><au>Yuan Sihua, Yuan Sihua</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Permian to Triassic protolith ages of type locality eclogites in the Eastern Alps; implications for the opening of the Meliata back-arc basin</atitle><jtitle>Geology (Boulder)</jtitle><date>2023-06-01</date><risdate>2023</risdate><volume>51</volume><issue>6</issue><spage>537</spage><epage>542</epage><pages>537-542</pages><issn>0091-7613</issn><eissn>1943-2682</eissn><abstract>The Austroalpine domain contains the type locality of eclogites, but their protolith age is unknown except for a Permian metagabbro. Therefore, we studied the non-gabbroic eclogites from the Saualpe-Koralpe Complex (SKC) representing meta-basalts within a coherent continental rift fragment subducted during the Cretaceous. Zircon laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating revealed protolith ages of 283 ± 5 Ma, 255 ± 3 Ma, 251 ± 3 Ma, and 241 ± 3 Ma. Magmatic zircons exhibit 176Hf/177Hf ratios of 0.282935-0.283090 and juvenile εHf(t) values of +10 to +17.4. Typical normal mid-oceanic ridge basalt (N-MORB) geochemistry is established. The SKC host metasedimentary rocks are interpreted as Variscan continental crust close to the margin of the oceanic Meliata basin and were affected by Permian metamorphism. Metamorphic zircon of one SKC eclogite yields an age of 87-93 Ma. These results combined with previous data are used to present a new model for the tectonic evolution of the distal Austroalpine unit associated with the Meliata Ocean in a Wilson cycle: The SKC represents a distal continental margin during Permian to Middle Triassic rifting, which was intruded by few gabbro bodies and numerous basaltic sills and mostly Permian pegmatites. In contrast, structurally separated thick Triassic sedimentary cover successions of the Austroalpine domain lack any magmatism, excluding SKC as Triassic basement of the sedimentary cover successions. The present eclogite-bearing piece of continental crust adjacent to the Meliata oceanic lithosphere was subducted to mantle depth during Late Cretaceous and then exhumed.</abstract><cop>Boulder</cop><pub>Geological Society of America (GSA)</pub><doi>10.1130/G50903.1</doi><tpages>6</tpages><orcidid>https://orcid.org/0000-0002-1326-3622</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Geology (Boulder), 2023-06, Vol.51 (6), p.537-542 |
| issn | 0091-7613 1943-2682 |
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| subjects | Ablation Alps back-arc basins Basalt basalts basins Continental crust Continental margins Cretaceous crust Dating Domains Eastern Alps Eclogite Europe Gabbro Geochemistry Geochronometry Geology hafnium Hafnium isotopes Hf-177/Hf-176 ICP mass spectra igneous and metamorphic rocks igneous rocks Inductively coupled plasma mass spectrometry isotope ratios isotopes Juveniles Laser ablation laser methods Lithosphere Magma mass spectra Mass spectrometry Mass spectroscopy metabasalt metagabbro metaigneous rocks metals metamorphic rocks Metamorphism metasedimentary rocks mid-ocean ridge basalts nesosilicates orthosilicates Paleozoic Permian Petrology protoliths Radiometric dating Rifting Saualpe-Koralpe Complex silicates Sills spectra stable isotopes Subduction (geology) Tectonics Triassic U/Pb volcanic rocks Zircon zircon group |
| title | Permian to Triassic protolith ages of type locality eclogites in the Eastern Alps; implications for the opening of the Meliata back-arc basin |
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