U‐Pb dating of zircons from an impact melt of the Nördlinger Ries crater
In situ U‐Pb measurements on zircons of the Ries impact crater are presented for three samples from the quarry at Polsingen. The U‐Pb data of most zircons plot along a discordia line, leading to an upper intercept of Carboniferous age (331 ± 32 Ma [2σ]). Four zircons define a concordia age of 313.2 ...
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| Veröffentlicht in: | Meteoritics & planetary science 2020-02, Vol.55 (2), p.312-325 |
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| description | In situ U‐Pb measurements on zircons of the Ries impact crater are presented for three samples from the quarry at Polsingen. The U‐Pb data of most zircons plot along a discordia line, leading to an upper intercept of Carboniferous age (331 ± 32 Ma [2σ]). Four zircons define a concordia age of 313.2 ± 4.4 Ma (2σ). This age most probably represents the age of a granite from the basement target rocks. From granular textured zircon grains (including baddeleyite and anatase/Fe‐rich phases, first identified in the Ries crater), most probably recrystallized after impact (13 analyses, 4 grains), a concordia age of 14.89 ± 0.34 Ma (2σ) and an error weighted mean 206Pb*/238U age of Ma 14.63 ± 0.43 (2σ) is derived. Including the youngest concordant ages of five porous textured zircon grains (24 spot analyses), a concordia age of 14.75 ± 0.22 Ma (2σ) and a mean 206Pb*/238U age of 14.71 ± 0.26 Ma (2σ) can be calculated. These results are consistent with previously published 40Ar/39Ar ages of impact glasses and feldspar. Our results demonstrate that even for relatively young impact craters, reliable U‐Pb ages can be obtained using in situ zircon dating by SIMS. Frequently the texture of impact shocked zircon grains is explained by decomposition at high temperatures and recrystallization to a granular texture. This is most probably the case for the observed granular zircon grains having baddeleyite/anatase/Fe‐rich phases. We also observe non‐baddeleyite/anatase/Fe‐rich phase bearing zircons. For these domains, reset to crater age is more frequently for high U,Th contents. We tentatively explain the higher susceptibility to impact resetting of high U,Th domains by enhanced Pb loss and mobilization due to higher diffusivity within former metamict domains that were impact metamorphosed more easily into porous as well as granular textures during decomposition and recrystallization, possibly supported by Pb loss during postimpact cooling and/or hydrothermal activity. |
| doi_str_mv | 10.1111/maps.13437 |
| format | Article |
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The U‐Pb data of most zircons plot along a discordia line, leading to an upper intercept of Carboniferous age (331 ± 32 Ma [2σ]). Four zircons define a concordia age of 313.2 ± 4.4 Ma (2σ). This age most probably represents the age of a granite from the basement target rocks. From granular textured zircon grains (including baddeleyite and anatase/Fe‐rich phases, first identified in the Ries crater), most probably recrystallized after impact (13 analyses, 4 grains), a concordia age of 14.89 ± 0.34 Ma (2σ) and an error weighted mean 206Pb*/238U age of Ma 14.63 ± 0.43 (2σ) is derived. Including the youngest concordant ages of five porous textured zircon grains (24 spot analyses), a concordia age of 14.75 ± 0.22 Ma (2σ) and a mean 206Pb*/238U age of 14.71 ± 0.26 Ma (2σ) can be calculated. These results are consistent with previously published 40Ar/39Ar ages of impact glasses and feldspar. Our results demonstrate that even for relatively young impact craters, reliable U‐Pb ages can be obtained using in situ zircon dating by SIMS. Frequently the texture of impact shocked zircon grains is explained by decomposition at high temperatures and recrystallization to a granular texture. This is most probably the case for the observed granular zircon grains having baddeleyite/anatase/Fe‐rich phases. We also observe non‐baddeleyite/anatase/Fe‐rich phase bearing zircons. For these domains, reset to crater age is more frequently for high U,Th contents. We tentatively explain the higher susceptibility to impact resetting of high U,Th domains by enhanced Pb loss and mobilization due to higher diffusivity within former metamict domains that were impact metamorphosed more easily into porous as well as granular textures during decomposition and recrystallization, possibly supported by Pb loss during postimpact cooling and/or hydrothermal activity.</description><identifier>ISSN: 1086-9379</identifier><identifier>EISSN: 1945-5100</identifier><identifier>DOI: 10.1111/maps.13437</identifier><language>eng</language><publisher>HOBOKEN: Wiley</publisher><subject>Age ; Anatase ; Carboniferous ; Craters ; Dating ; Decomposition ; Domains ; Geochemistry & Geophysics ; Grains ; High temperature ; Impact analysis ; Iron ; Isotopes ; Lead ; Lead isotopes ; Physical Sciences ; Quarries ; Radiometric dating ; Recrystallization ; Science & Technology ; Texture ; Zircon</subject><ispartof>Meteoritics & planetary science, 2020-02, Vol.55 (2), p.312-325</ispartof><rights>The Meteoritical Society, 2020.</rights><rights>Copyright © 2020 The Meteoritical Society</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>true</woscitedreferencessubscribed><woscitedreferencescount>21</woscitedreferencescount><woscitedreferencesoriginalsourcerecordid>wos000509467400001</woscitedreferencesoriginalsourcerecordid><citedby>FETCH-LOGICAL-a3607-a1b9c16b8e7815961c26b69132f66e2a3f625351cde33cbb5c80ce4d14ede71c3</citedby><cites>FETCH-LOGICAL-a3607-a1b9c16b8e7815961c26b69132f66e2a3f625351cde33cbb5c80ce4d14ede71c3</cites><orcidid>0000-0002-2633-0433 ; 0000-0002-3292-9995</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1111%2Fmaps.13437$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1111%2Fmaps.13437$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,780,784,1417,1433,27924,27925,45574,45575,46409,46833</link.rule.ids></links><search><creatorcontrib>Schwarz, Winfried H.</creatorcontrib><creatorcontrib>Hanel, Michael</creatorcontrib><creatorcontrib>Trieloff, Mario</creatorcontrib><title>U‐Pb dating of zircons from an impact melt of the Nördlinger Ries crater</title><title>Meteoritics & planetary science</title><addtitle>METEORIT PLANET SCI</addtitle><description>In situ U‐Pb measurements on zircons of the Ries impact crater are presented for three samples from the quarry at Polsingen. The U‐Pb data of most zircons plot along a discordia line, leading to an upper intercept of Carboniferous age (331 ± 32 Ma [2σ]). Four zircons define a concordia age of 313.2 ± 4.4 Ma (2σ). This age most probably represents the age of a granite from the basement target rocks. From granular textured zircon grains (including baddeleyite and anatase/Fe‐rich phases, first identified in the Ries crater), most probably recrystallized after impact (13 analyses, 4 grains), a concordia age of 14.89 ± 0.34 Ma (2σ) and an error weighted mean 206Pb*/238U age of Ma 14.63 ± 0.43 (2σ) is derived. Including the youngest concordant ages of five porous textured zircon grains (24 spot analyses), a concordia age of 14.75 ± 0.22 Ma (2σ) and a mean 206Pb*/238U age of 14.71 ± 0.26 Ma (2σ) can be calculated. These results are consistent with previously published 40Ar/39Ar ages of impact glasses and feldspar. Our results demonstrate that even for relatively young impact craters, reliable U‐Pb ages can be obtained using in situ zircon dating by SIMS. Frequently the texture of impact shocked zircon grains is explained by decomposition at high temperatures and recrystallization to a granular texture. This is most probably the case for the observed granular zircon grains having baddeleyite/anatase/Fe‐rich phases. We also observe non‐baddeleyite/anatase/Fe‐rich phase bearing zircons. For these domains, reset to crater age is more frequently for high U,Th contents. We tentatively explain the higher susceptibility to impact resetting of high U,Th domains by enhanced Pb loss and mobilization due to higher diffusivity within former metamict domains that were impact metamorphosed more easily into porous as well as granular textures during decomposition and recrystallization, possibly supported by Pb loss during postimpact cooling and/or hydrothermal activity.</description><subject>Age</subject><subject>Anatase</subject><subject>Carboniferous</subject><subject>Craters</subject><subject>Dating</subject><subject>Decomposition</subject><subject>Domains</subject><subject>Geochemistry & Geophysics</subject><subject>Grains</subject><subject>High temperature</subject><subject>Impact analysis</subject><subject>Iron</subject><subject>Isotopes</subject><subject>Lead</subject><subject>Lead isotopes</subject><subject>Physical Sciences</subject><subject>Quarries</subject><subject>Radiometric dating</subject><subject>Recrystallization</subject><subject>Science & Technology</subject><subject>Texture</subject><subject>Zircon</subject><issn>1086-9379</issn><issn>1945-5100</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>AOWDO</sourceid><recordid>eNqNkE1OwzAQhSMEEqWw4QSW2IFS7Dhx4mVV8SfKj4CuI8eZgKskDrYrVFYcgdNwAW7CSXBJxRIxmxlpvjfz9IJgn-AR8XXciM6OCI1puhEMCI-TMCEYb_oZZyzkNOXbwY61c4xp4rFBcDn7enu_LVApnGofka7QqzJStxZVRjdItEg1nZAONVC71do9Abr-_DBl7Xkw6E6BRdIIB2Y32KpEbWFv3YfB7PTkYXIeTm_OLibjaSgow2koSMElYUUGaUYSzoiMWME4oVHFGESCVixKvD1ZAqWyKBKZYQlxSWIoISWSDoOD_m5n9PMCrMvnemFa_zKPaEo54xQTTx32lDTaWgNV3hnVCLPMCc5XYeWrsPKfsDyc9fALFLqyUkEr4VeAMU4wj1ka-wmTiXI-Ld1O9KJ1Xnr0f6mnyZpWNSz_sJRfjW_ve3PfTk2Nfw</recordid><startdate>202002</startdate><enddate>202002</enddate><creator>Schwarz, Winfried H.</creator><creator>Hanel, Michael</creator><creator>Trieloff, Mario</creator><general>Wiley</general><general>Wiley Subscription Services, Inc</general><scope>AOWDO</scope><scope>BLEPL</scope><scope>DTL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-2633-0433</orcidid><orcidid>https://orcid.org/0000-0002-3292-9995</orcidid></search><sort><creationdate>202002</creationdate><title>U‐Pb dating of zircons from an impact melt of the Nördlinger Ries crater</title><author>Schwarz, Winfried H. ; Hanel, Michael ; Trieloff, Mario</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3607-a1b9c16b8e7815961c26b69132f66e2a3f625351cde33cbb5c80ce4d14ede71c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Age</topic><topic>Anatase</topic><topic>Carboniferous</topic><topic>Craters</topic><topic>Dating</topic><topic>Decomposition</topic><topic>Domains</topic><topic>Geochemistry & Geophysics</topic><topic>Grains</topic><topic>High temperature</topic><topic>Impact analysis</topic><topic>Iron</topic><topic>Isotopes</topic><topic>Lead</topic><topic>Lead isotopes</topic><topic>Physical Sciences</topic><topic>Quarries</topic><topic>Radiometric dating</topic><topic>Recrystallization</topic><topic>Science & Technology</topic><topic>Texture</topic><topic>Zircon</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Schwarz, Winfried H.</creatorcontrib><creatorcontrib>Hanel, Michael</creatorcontrib><creatorcontrib>Trieloff, Mario</creatorcontrib><collection>Web of Science - Science Citation Index Expanded - 2020</collection><collection>Web of Science Core Collection</collection><collection>Science Citation Index Expanded</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Meteoritics & planetary science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Schwarz, Winfried H.</au><au>Hanel, Michael</au><au>Trieloff, Mario</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>U‐Pb dating of zircons from an impact melt of the Nördlinger Ries crater</atitle><jtitle>Meteoritics & planetary science</jtitle><stitle>METEORIT PLANET SCI</stitle><date>2020-02</date><risdate>2020</risdate><volume>55</volume><issue>2</issue><spage>312</spage><epage>325</epage><pages>312-325</pages><issn>1086-9379</issn><eissn>1945-5100</eissn><abstract>In situ U‐Pb measurements on zircons of the Ries impact crater are presented for three samples from the quarry at Polsingen. The U‐Pb data of most zircons plot along a discordia line, leading to an upper intercept of Carboniferous age (331 ± 32 Ma [2σ]). Four zircons define a concordia age of 313.2 ± 4.4 Ma (2σ). This age most probably represents the age of a granite from the basement target rocks. From granular textured zircon grains (including baddeleyite and anatase/Fe‐rich phases, first identified in the Ries crater), most probably recrystallized after impact (13 analyses, 4 grains), a concordia age of 14.89 ± 0.34 Ma (2σ) and an error weighted mean 206Pb*/238U age of Ma 14.63 ± 0.43 (2σ) is derived. Including the youngest concordant ages of five porous textured zircon grains (24 spot analyses), a concordia age of 14.75 ± 0.22 Ma (2σ) and a mean 206Pb*/238U age of 14.71 ± 0.26 Ma (2σ) can be calculated. These results are consistent with previously published 40Ar/39Ar ages of impact glasses and feldspar. Our results demonstrate that even for relatively young impact craters, reliable U‐Pb ages can be obtained using in situ zircon dating by SIMS. Frequently the texture of impact shocked zircon grains is explained by decomposition at high temperatures and recrystallization to a granular texture. This is most probably the case for the observed granular zircon grains having baddeleyite/anatase/Fe‐rich phases. We also observe non‐baddeleyite/anatase/Fe‐rich phase bearing zircons. For these domains, reset to crater age is more frequently for high U,Th contents. We tentatively explain the higher susceptibility to impact resetting of high U,Th domains by enhanced Pb loss and mobilization due to higher diffusivity within former metamict domains that were impact metamorphosed more easily into porous as well as granular textures during decomposition and recrystallization, possibly supported by Pb loss during postimpact cooling and/or hydrothermal activity.</abstract><cop>HOBOKEN</cop><pub>Wiley</pub><doi>10.1111/maps.13437</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0002-2633-0433</orcidid><orcidid>https://orcid.org/0000-0002-3292-9995</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Age Anatase Carboniferous Craters Dating Decomposition Domains Geochemistry & Geophysics Grains High temperature Impact analysis Iron Isotopes Lead Lead isotopes Physical Sciences Quarries Radiometric dating Recrystallization Science & Technology Texture Zircon |
| title | U‐Pb dating of zircons from an impact melt of the Nördlinger Ries crater |
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