Petrogenesis of the Carboniferous Ghaleh-Dezh metagranite, Sanandaj–Sirjan zone, Iran: constraints from new zircon U–Pb and 40Ar/39Ar ages and Sr–Nd isotopes
The Ghaleh-Dezh metagranites in the northern Sanandaj–Sirjan Zone (SaSZ) in western Iran are found in a 0.5 km long by 0.3 km wide unit emplaced within the older Precambrian basement. New zircon U–Pb ages confirm that crystallization and emplacement of the protolith of the metagranites occurred at 3...
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| Veröffentlicht in: | Geological magazine 2020-11, Vol.157 (11), p.1823-1852 |
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| creator | Shabanian, Nahid Davoudian, Ali Reza Azizi, Hossein Asahara, Yoshihiro Neubauer, Franz Genser, Johan Dong, Yunpeng Lee, James K.W. |
| description | The Ghaleh-Dezh metagranites in the northern Sanandaj–Sirjan Zone (SaSZ) in western Iran are found in a 0.5 km long by 0.3 km wide unit emplaced within the older Precambrian basement. New zircon U–Pb ages confirm that crystallization and emplacement of the protolith of the metagranites occurred at 312 ± 10 Ma and 298 ± 17 Ma in the Upper Carboniferous (Pennsylvanian) – Early Permian, which is consistent with the ages of recently discovered Palaeozoic granites in the northern SaSZ. The studied metagranitic body has been metamorphosed at lower greenschist facies and deformed in ductile–brittle regime due to subsequent reheating events during the Mesozoic. The rocks are metaluminous to slightly peraluminous granites with an A2-type affinity. Initial 87Sr/86Sr ratios and εNd(t) contents vary from 0.7037 to 0.7130 and −0.70 to 0.34, respectively. 143Nd/144Nd(i) values for the granitic rocks are fairly uniform at ∼0.5123. The geochemical and isotopic evidence indicates that these rocks were generated from a mantle magma with crustal contamination and fractional crystallization. Rb–Sr isochron and 40Ar/39Ar K-feldspar ages are 274 Ma and 60–70 Ma, respectively. The older event, c. 270 Ma, was likely related to the opening of Neotethys, whereas the younger ages likely relate to collisional events in the region during the closure of Neotethys. |
| doi_str_mv | 10.1017/S0016756820000096 |
| format | Article |
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New zircon U–Pb ages confirm that crystallization and emplacement of the protolith of the metagranites occurred at 312 ± 10 Ma and 298 ± 17 Ma in the Upper Carboniferous (Pennsylvanian) – Early Permian, which is consistent with the ages of recently discovered Palaeozoic granites in the northern SaSZ. The studied metagranitic body has been metamorphosed at lower greenschist facies and deformed in ductile–brittle regime due to subsequent reheating events during the Mesozoic. The rocks are metaluminous to slightly peraluminous granites with an A2-type affinity. Initial 87Sr/86Sr ratios and εNd(t) contents vary from 0.7037 to 0.7130 and −0.70 to 0.34, respectively. 143Nd/144Nd(i) values for the granitic rocks are fairly uniform at ∼0.5123. The geochemical and isotopic evidence indicates that these rocks were generated from a mantle magma with crustal contamination and fractional crystallization. Rb–Sr isochron and 40Ar/39Ar K-feldspar ages are 274 Ma and 60–70 Ma, respectively. The older event, c. 270 Ma, was likely related to the opening of Neotethys, whereas the younger ages likely relate to collisional events in the region during the closure of Neotethys.</description><identifier>ISSN: 0016-7568</identifier><identifier>EISSN: 1469-5081</identifier><identifier>DOI: 10.1017/S0016756820000096</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>absolute age ; affinities ; alkaline earth metals ; Ar/Ar ; Argon ; Asia ; brittle deformation ; Carboniferous ; cathodoluminescence ; chemical composition ; Contamination ; Crystallization ; deformation ; ductile deformation ; Ductile-brittle transition ; electron probe data ; emplacement ; exhumation ; facies ; Feldspars ; Fractional crystallization ; genesis ; Geochronology ; Ghaleh-Dezh Metagranite ; Granite ; Greenschist facies ; Heating ; igneous and metamorphic rocks ; Iran ; isotope ratios ; Isotopes ; Lava ; Lead ; Magma ; magma contamination ; magmas ; mantle ; Mesozoic ; metagranite ; metaigneous rocks ; metals ; metamorphic rocks ; Metamorphism ; Middle East ; mineral composition ; Nd-144/Nd-143 ; neodymium ; Neodymium isotopes ; Neotethys ; Original Article ; Palaeozoic ; Paleozoic ; Pan-Africanism ; Permian ; Petrogenesis ; petrography ; Petrology ; Precambrian ; protoliths ; Radiometric dating ; rare earths ; Rock ; Rocks ; Sanandaj-Sirjan Zone ; Sedimentary facies ; Sr-87/Sr-86 ; stable isotopes ; strontium ; Strontium 87 ; Strontium isotopes ; tectonics ; U/Pb ; whole rock ; Zircon</subject><ispartof>Geological magazine, 2020-11, Vol.157 (11), p.1823-1852</ispartof><rights>Cambridge University Press 2020</rights><rights>GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. Abstract, Copyright, Cambridge University Press</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><orcidid>0000-0002-0529-957X</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.cambridge.org/core/product/identifier/S0016756820000096/type/journal_article$$EHTML$$P50$$Gcambridge$$H</linktohtml><link.rule.ids>164,314,780,784,27924,27925,55628</link.rule.ids></links><search><creatorcontrib>Shabanian, Nahid</creatorcontrib><creatorcontrib>Davoudian, Ali Reza</creatorcontrib><creatorcontrib>Azizi, Hossein</creatorcontrib><creatorcontrib>Asahara, Yoshihiro</creatorcontrib><creatorcontrib>Neubauer, Franz</creatorcontrib><creatorcontrib>Genser, Johan</creatorcontrib><creatorcontrib>Dong, Yunpeng</creatorcontrib><creatorcontrib>Lee, James K.W.</creatorcontrib><title>Petrogenesis of the Carboniferous Ghaleh-Dezh metagranite, Sanandaj–Sirjan zone, Iran: constraints from new zircon U–Pb and 40Ar/39Ar ages and Sr–Nd isotopes</title><title>Geological magazine</title><addtitle>Geol. Mag</addtitle><description>The Ghaleh-Dezh metagranites in the northern Sanandaj–Sirjan Zone (SaSZ) in western Iran are found in a 0.5 km long by 0.3 km wide unit emplaced within the older Precambrian basement. New zircon U–Pb ages confirm that crystallization and emplacement of the protolith of the metagranites occurred at 312 ± 10 Ma and 298 ± 17 Ma in the Upper Carboniferous (Pennsylvanian) – Early Permian, which is consistent with the ages of recently discovered Palaeozoic granites in the northern SaSZ. The studied metagranitic body has been metamorphosed at lower greenschist facies and deformed in ductile–brittle regime due to subsequent reheating events during the Mesozoic. The rocks are metaluminous to slightly peraluminous granites with an A2-type affinity. Initial 87Sr/86Sr ratios and εNd(t) contents vary from 0.7037 to 0.7130 and −0.70 to 0.34, respectively. 143Nd/144Nd(i) values for the granitic rocks are fairly uniform at ∼0.5123. The geochemical and isotopic evidence indicates that these rocks were generated from a mantle magma with crustal contamination and fractional crystallization. Rb–Sr isochron and 40Ar/39Ar K-feldspar ages are 274 Ma and 60–70 Ma, respectively. The older event, c. 270 Ma, was likely related to the opening of Neotethys, whereas the younger ages likely relate to collisional events in the region during the closure of Neotethys.</description><subject>absolute age</subject><subject>affinities</subject><subject>alkaline earth metals</subject><subject>Ar/Ar</subject><subject>Argon</subject><subject>Asia</subject><subject>brittle deformation</subject><subject>Carboniferous</subject><subject>cathodoluminescence</subject><subject>chemical composition</subject><subject>Contamination</subject><subject>Crystallization</subject><subject>deformation</subject><subject>ductile deformation</subject><subject>Ductile-brittle transition</subject><subject>electron probe data</subject><subject>emplacement</subject><subject>exhumation</subject><subject>facies</subject><subject>Feldspars</subject><subject>Fractional crystallization</subject><subject>genesis</subject><subject>Geochronology</subject><subject>Ghaleh-Dezh Metagranite</subject><subject>Granite</subject><subject>Greenschist facies</subject><subject>Heating</subject><subject>igneous and metamorphic rocks</subject><subject>Iran</subject><subject>isotope ratios</subject><subject>Isotopes</subject><subject>Lava</subject><subject>Lead</subject><subject>Magma</subject><subject>magma contamination</subject><subject>magmas</subject><subject>mantle</subject><subject>Mesozoic</subject><subject>metagranite</subject><subject>metaigneous rocks</subject><subject>metals</subject><subject>metamorphic rocks</subject><subject>Metamorphism</subject><subject>Middle East</subject><subject>mineral composition</subject><subject>Nd-144/Nd-143</subject><subject>neodymium</subject><subject>Neodymium isotopes</subject><subject>Neotethys</subject><subject>Original Article</subject><subject>Palaeozoic</subject><subject>Paleozoic</subject><subject>Pan-Africanism</subject><subject>Permian</subject><subject>Petrogenesis</subject><subject>petrography</subject><subject>Petrology</subject><subject>Precambrian</subject><subject>protoliths</subject><subject>Radiometric dating</subject><subject>rare earths</subject><subject>Rock</subject><subject>Rocks</subject><subject>Sanandaj-Sirjan Zone</subject><subject>Sedimentary facies</subject><subject>Sr-87/Sr-86</subject><subject>stable isotopes</subject><subject>strontium</subject><subject>Strontium 87</subject><subject>Strontium isotopes</subject><subject>tectonics</subject><subject>U/Pb</subject><subject>whole rock</subject><subject>Zircon</subject><issn>0016-7568</issn><issn>1469-5081</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNplkc9uEzEQxi0EEqHwANwscYSl4_1nm1uUQqlUQaXQ82rWO7txlNjFdlQpJ96BR-ib9UnwEiSQmMtovu83M4ePsdcC3gsQ8nwNIFrZtKqEuXT7hC1E3eqiASWessVsF7P_nL2IcZvHCpRasIcbSsFP5CjayP3I04b4CkPvnR0p-EPklxvc0aa4oOOG7ynhFNDZRO_4Gh26AbePP36ubdii40fvsn6VgQ_ceBdTQOtS5GPwe-7onh9tyDq_zSs3Pc_bvIZlOK_0MnCcKP6W1iHbXwZuo0_-juJL9mzEXaRXf_oZu_308dvqc3H99fJqtbwujNBVKnoyaCRpWQGUoEwrlR5kO6BUDdRiHEVpkHDoTQPSiHrQEiSWxgjUWguqztib09274L8fKKZu6w_B5ZddWTdKgxQNZOrtiZrIR2PJGbr3YTf8A0MpOoCqVDNdnWiD-z7YYaK_nIBuzq77L7vqFxDZj0A</recordid><startdate>202011</startdate><enddate>202011</enddate><creator>Shabanian, Nahid</creator><creator>Davoudian, Ali Reza</creator><creator>Azizi, Hossein</creator><creator>Asahara, Yoshihiro</creator><creator>Neubauer, Franz</creator><creator>Genser, Johan</creator><creator>Dong, Yunpeng</creator><creator>Lee, James K.W.</creator><general>Cambridge University 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isotopes</title><author>Shabanian, Nahid ; Davoudian, Ali Reza ; Azizi, Hossein ; Asahara, Yoshihiro ; Neubauer, Franz ; Genser, Johan ; Dong, Yunpeng ; Lee, James K.W.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c193t-becac7e97300208c6789d76da785041ff12caeadbc507c14d9707a2cc1a9991e3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>absolute age</topic><topic>affinities</topic><topic>alkaline earth metals</topic><topic>Ar/Ar</topic><topic>Argon</topic><topic>Asia</topic><topic>brittle deformation</topic><topic>Carboniferous</topic><topic>cathodoluminescence</topic><topic>chemical composition</topic><topic>Contamination</topic><topic>Crystallization</topic><topic>deformation</topic><topic>ductile deformation</topic><topic>Ductile-brittle transition</topic><topic>electron probe data</topic><topic>emplacement</topic><topic>exhumation</topic><topic>facies</topic><topic>Feldspars</topic><topic>Fractional crystallization</topic><topic>genesis</topic><topic>Geochronology</topic><topic>Ghaleh-Dezh Metagranite</topic><topic>Granite</topic><topic>Greenschist facies</topic><topic>Heating</topic><topic>igneous and metamorphic rocks</topic><topic>Iran</topic><topic>isotope ratios</topic><topic>Isotopes</topic><topic>Lava</topic><topic>Lead</topic><topic>Magma</topic><topic>magma contamination</topic><topic>magmas</topic><topic>mantle</topic><topic>Mesozoic</topic><topic>metagranite</topic><topic>metaigneous rocks</topic><topic>metals</topic><topic>metamorphic rocks</topic><topic>Metamorphism</topic><topic>Middle East</topic><topic>mineral composition</topic><topic>Nd-144/Nd-143</topic><topic>neodymium</topic><topic>Neodymium isotopes</topic><topic>Neotethys</topic><topic>Original Article</topic><topic>Palaeozoic</topic><topic>Paleozoic</topic><topic>Pan-Africanism</topic><topic>Permian</topic><topic>Petrogenesis</topic><topic>petrography</topic><topic>Petrology</topic><topic>Precambrian</topic><topic>protoliths</topic><topic>Radiometric dating</topic><topic>rare earths</topic><topic>Rock</topic><topic>Rocks</topic><topic>Sanandaj-Sirjan Zone</topic><topic>Sedimentary facies</topic><topic>Sr-87/Sr-86</topic><topic>stable isotopes</topic><topic>strontium</topic><topic>Strontium 87</topic><topic>Strontium isotopes</topic><topic>tectonics</topic><topic>U/Pb</topic><topic>whole rock</topic><topic>Zircon</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Shabanian, Nahid</creatorcontrib><creatorcontrib>Davoudian, Ali Reza</creatorcontrib><creatorcontrib>Azizi, Hossein</creatorcontrib><creatorcontrib>Asahara, Yoshihiro</creatorcontrib><creatorcontrib>Neubauer, Franz</creatorcontrib><creatorcontrib>Genser, 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USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Engineering Collection</collection><collection>ProQuest Central Basic</collection><collection>University of Michigan</collection><jtitle>Geological magazine</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Shabanian, Nahid</au><au>Davoudian, Ali Reza</au><au>Azizi, Hossein</au><au>Asahara, Yoshihiro</au><au>Neubauer, Franz</au><au>Genser, Johan</au><au>Dong, Yunpeng</au><au>Lee, James K.W.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Petrogenesis of the Carboniferous Ghaleh-Dezh metagranite, Sanandaj–Sirjan zone, Iran: constraints from new zircon U–Pb and 40Ar/39Ar ages and Sr–Nd isotopes</atitle><jtitle>Geological magazine</jtitle><addtitle>Geol. Mag</addtitle><date>2020-11</date><risdate>2020</risdate><volume>157</volume><issue>11</issue><spage>1823</spage><epage>1852</epage><pages>1823-1852</pages><issn>0016-7568</issn><eissn>1469-5081</eissn><abstract>The Ghaleh-Dezh metagranites in the northern Sanandaj–Sirjan Zone (SaSZ) in western Iran are found in a 0.5 km long by 0.3 km wide unit emplaced within the older Precambrian basement. New zircon U–Pb ages confirm that crystallization and emplacement of the protolith of the metagranites occurred at 312 ± 10 Ma and 298 ± 17 Ma in the Upper Carboniferous (Pennsylvanian) – Early Permian, which is consistent with the ages of recently discovered Palaeozoic granites in the northern SaSZ. The studied metagranitic body has been metamorphosed at lower greenschist facies and deformed in ductile–brittle regime due to subsequent reheating events during the Mesozoic. The rocks are metaluminous to slightly peraluminous granites with an A2-type affinity. Initial 87Sr/86Sr ratios and εNd(t) contents vary from 0.7037 to 0.7130 and −0.70 to 0.34, respectively. 143Nd/144Nd(i) values for the granitic rocks are fairly uniform at ∼0.5123. The geochemical and isotopic evidence indicates that these rocks were generated from a mantle magma with crustal contamination and fractional crystallization. Rb–Sr isochron and 40Ar/39Ar K-feldspar ages are 274 Ma and 60–70 Ma, respectively. The older event, c. 270 Ma, was likely related to the opening of Neotethys, whereas the younger ages likely relate to collisional events in the region during the closure of Neotethys.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/S0016756820000096</doi><tpages>30</tpages><orcidid>https://orcid.org/0000-0002-0529-957X</orcidid></addata></record> |
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| subjects | absolute age affinities alkaline earth metals Ar/Ar Argon Asia brittle deformation Carboniferous cathodoluminescence chemical composition Contamination Crystallization deformation ductile deformation Ductile-brittle transition electron probe data emplacement exhumation facies Feldspars Fractional crystallization genesis Geochronology Ghaleh-Dezh Metagranite Granite Greenschist facies Heating igneous and metamorphic rocks Iran isotope ratios Isotopes Lava Lead Magma magma contamination magmas mantle Mesozoic metagranite metaigneous rocks metals metamorphic rocks Metamorphism Middle East mineral composition Nd-144/Nd-143 neodymium Neodymium isotopes Neotethys Original Article Palaeozoic Paleozoic Pan-Africanism Permian Petrogenesis petrography Petrology Precambrian protoliths Radiometric dating rare earths Rock Rocks Sanandaj-Sirjan Zone Sedimentary facies Sr-87/Sr-86 stable isotopes strontium Strontium 87 Strontium isotopes tectonics U/Pb whole rock Zircon |
| title | Petrogenesis of the Carboniferous Ghaleh-Dezh metagranite, Sanandaj–Sirjan zone, Iran: constraints from new zircon U–Pb and 40Ar/39Ar ages and Sr–Nd isotopes |
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