Late Neoprotherozoic Granitoid Magmatism of the Baikal-Muya Fold Belt, Ophiolite and Post-Ophiolite Plagiogranites
Three different-age series of granitoid veins and dikes of the Baikal–Muya fold belt were studied. Two of them, plagiogranites of the ophiolite complex and the first postophiolitic plagiogranites, are associated with the suprasubduction ophiolites of the eastern Baikal–Muya belt. The third series is...
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| Veröffentlicht in: | Geochemistry international 2021, Vol.59 (1), p.12-31 |
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| creator | Somsikova, A. V. Kostitsyn, Yu. A. Fedotova, A. A. Razumovskiy, A. A. Khain, E. V. Astrakhantsev, O. V. Batanova, V. G. Anosova, M. O. |
| description | Three different-age series of granitoid veins and dikes of the Baikal–Muya fold belt were studied. Two of them, plagiogranites of the ophiolite complex and the first postophiolitic plagiogranites, are associated with the suprasubduction ophiolites of the eastern Baikal–Muya belt. The third series is represented by hypabyssal tonalite–plagiogranite–leucogranite complex of the Kichera zone in the western Baikal–Muya belt. The composition and isotope-geochemical characteristics (ε
Nd
(T) = –0.9; –1.3) of the plagiogranite veins no more than 60 cm thick, and ε
Nd
(T) values (–1.8…+ 0.2) of host layered leucocratic gabbros in the Sredne-Mamakan ophiolitic complex are consistent with the previously established suprasubduction nature of the ophiolite association. Tonalites and plagiogranites of the dyke system of the post-ophiolitic magmatic series intersect the dunite–pyroxenite–gabbro banded series of the Sredne-Mamakan ophiolites of the eastern Baikal–Muya fold zone. High Sr/Y ratios and low concentrations of Y and heavy REE indicate that these granitoids are ascribed to the adakite series. LA-ICP-MS study of zircon from post-ophiolitic plagiogranites yields the crystallization age of 629 ± 5 Ma. Sm–Nd isotope-geochemical characteristics of plagiogranitoids (ε
Nd
(T) = +2.5; +4.0) in combination with geochemical data confirm their origin during partial melting of a mafic protolith corresponding to the Neoproterozoic oceanic crust. The adakitic granitoids in the Kichera zone of the western Baikal–Muya belt belong to the tonalite–leucogranite differentiated series of the hypabyssal complex, which has no a direct spatial relationship with unambiguous ophiolite associations. The chemical composition and Sm–Nd isotope-geochemical characteristics of these rocks (ε
Nd
(T) = +3.2…+7.1) indicate the heterogeneity of the predominantly juvenile island-arc or oceanic Neoproterozoic crust, which experienced partial melting at 595 ± 5 Ma. |
| doi_str_mv | 10.1134/S0016702921010109 |
| format | Article |
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Nd
(T) = –0.9; –1.3) of the plagiogranite veins no more than 60 cm thick, and ε
Nd
(T) values (–1.8…+ 0.2) of host layered leucocratic gabbros in the Sredne-Mamakan ophiolitic complex are consistent with the previously established suprasubduction nature of the ophiolite association. Tonalites and plagiogranites of the dyke system of the post-ophiolitic magmatic series intersect the dunite–pyroxenite–gabbro banded series of the Sredne-Mamakan ophiolites of the eastern Baikal–Muya fold zone. High Sr/Y ratios and low concentrations of Y and heavy REE indicate that these granitoids are ascribed to the adakite series. LA-ICP-MS study of zircon from post-ophiolitic plagiogranites yields the crystallization age of 629 ± 5 Ma. Sm–Nd isotope-geochemical characteristics of plagiogranitoids (ε
Nd
(T) = +2.5; +4.0) in combination with geochemical data confirm their origin during partial melting of a mafic protolith corresponding to the Neoproterozoic oceanic crust. The adakitic granitoids in the Kichera zone of the western Baikal–Muya belt belong to the tonalite–leucogranite differentiated series of the hypabyssal complex, which has no a direct spatial relationship with unambiguous ophiolite associations. The chemical composition and Sm–Nd isotope-geochemical characteristics of these rocks (ε
Nd
(T) = +3.2…+7.1) indicate the heterogeneity of the predominantly juvenile island-arc or oceanic Neoproterozoic crust, which experienced partial melting at 595 ± 5 Ma.</description><identifier>ISSN: 0016-7029</identifier><identifier>EISSN: 1556-1968</identifier><identifier>DOI: 10.1134/S0016702921010109</identifier><language>eng</language><publisher>Moscow: Pleiades Publishing</publisher><subject>Belts ; Chemical composition ; Crystallization ; Dikes ; Dunite ; Earth and Environmental Science ; Earth Sciences ; Embankments ; Gabbro ; Gabbros ; Geochemistry ; Granite ; Heterogeneity ; Island arcs ; Isotopes ; Lava ; Low concentrations ; Magma ; Magmatism ; Melting ; Oceanic crust ; Ophiolites ; Rocks, Metamorphic ; Veins (geology) ; Zircon</subject><ispartof>Geochemistry international, 2021, Vol.59 (1), p.12-31</ispartof><rights>Pleiades Publishing, Ltd. 2021. ISSN 0016-7029, Geochemistry International, 2021, Vol. 59, No. 1, pp. 12–31. © Pleiades Publishing, Ltd., 2021. Russian Text © The Author(s), 2021, published in Geokhimiya, 2021, Vol. 66, No. 1, pp. 15–36.</rights><rights>COPYRIGHT 2021 Springer</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c355t-f00509c6de4d3485a9b66bc1df729fe6e015c373e22eea1405e66f8aba97c8703</citedby><cites>FETCH-LOGICAL-c355t-f00509c6de4d3485a9b66bc1df729fe6e015c373e22eea1405e66f8aba97c8703</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1134/S0016702921010109$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1134/S0016702921010109$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27903,27904,41467,42536,51297</link.rule.ids></links><search><creatorcontrib>Somsikova, A. V.</creatorcontrib><creatorcontrib>Kostitsyn, Yu. A.</creatorcontrib><creatorcontrib>Fedotova, A. A.</creatorcontrib><creatorcontrib>Razumovskiy, A. A.</creatorcontrib><creatorcontrib>Khain, E. V.</creatorcontrib><creatorcontrib>Astrakhantsev, O. V.</creatorcontrib><creatorcontrib>Batanova, V. G.</creatorcontrib><creatorcontrib>Anosova, M. O.</creatorcontrib><title>Late Neoprotherozoic Granitoid Magmatism of the Baikal-Muya Fold Belt, Ophiolite and Post-Ophiolite Plagiogranites</title><title>Geochemistry international</title><addtitle>Geochem. Int</addtitle><description>Three different-age series of granitoid veins and dikes of the Baikal–Muya fold belt were studied. Two of them, plagiogranites of the ophiolite complex and the first postophiolitic plagiogranites, are associated with the suprasubduction ophiolites of the eastern Baikal–Muya belt. The third series is represented by hypabyssal tonalite–plagiogranite–leucogranite complex of the Kichera zone in the western Baikal–Muya belt. The composition and isotope-geochemical characteristics (ε
Nd
(T) = –0.9; –1.3) of the plagiogranite veins no more than 60 cm thick, and ε
Nd
(T) values (–1.8…+ 0.2) of host layered leucocratic gabbros in the Sredne-Mamakan ophiolitic complex are consistent with the previously established suprasubduction nature of the ophiolite association. Tonalites and plagiogranites of the dyke system of the post-ophiolitic magmatic series intersect the dunite–pyroxenite–gabbro banded series of the Sredne-Mamakan ophiolites of the eastern Baikal–Muya fold zone. High Sr/Y ratios and low concentrations of Y and heavy REE indicate that these granitoids are ascribed to the adakite series. LA-ICP-MS study of zircon from post-ophiolitic plagiogranites yields the crystallization age of 629 ± 5 Ma. Sm–Nd isotope-geochemical characteristics of plagiogranitoids (ε
Nd
(T) = +2.5; +4.0) in combination with geochemical data confirm their origin during partial melting of a mafic protolith corresponding to the Neoproterozoic oceanic crust. The adakitic granitoids in the Kichera zone of the western Baikal–Muya belt belong to the tonalite–leucogranite differentiated series of the hypabyssal complex, which has no a direct spatial relationship with unambiguous ophiolite associations. The chemical composition and Sm–Nd isotope-geochemical characteristics of these rocks (ε
Nd
(T) = +3.2…+7.1) indicate the heterogeneity of the predominantly juvenile island-arc or oceanic Neoproterozoic crust, which experienced partial melting at 595 ± 5 Ma.</description><subject>Belts</subject><subject>Chemical composition</subject><subject>Crystallization</subject><subject>Dikes</subject><subject>Dunite</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Embankments</subject><subject>Gabbro</subject><subject>Gabbros</subject><subject>Geochemistry</subject><subject>Granite</subject><subject>Heterogeneity</subject><subject>Island arcs</subject><subject>Isotopes</subject><subject>Lava</subject><subject>Low concentrations</subject><subject>Magma</subject><subject>Magmatism</subject><subject>Melting</subject><subject>Oceanic crust</subject><subject>Ophiolites</subject><subject>Rocks, Metamorphic</subject><subject>Veins (geology)</subject><subject>Zircon</subject><issn>0016-7029</issn><issn>1556-1968</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp1kU1PGzEQhi3USk0pP6A3S712wd71x_qYRIUihYIEnFcT73gxbNap7Rzor69DkHKoqjmMNPM-78xoCPnK2Tnnjbi4Z4wrzWpTc7YPc0JmXEpVcaPaD2S2b1f7_ifyOaVnxoRojJ6RuIKM9BeGbQz5CWP4E7ylVxEmn4Pv6Q0MG8g-bWhwtAjoAvwLjNXN7hXoZRh7usAxf6e32ycfRl-8YOrpXUi5OpbuRhh8GN5MMX0hHx2MCc_e8yl5vPzxsPxZrW6vrpfzVWUbKXPlGJPMWNWj6BvRSjBrpdaW907XxqFCxqVtdIN1jQhcMIlKuRbWYLRtNWtOybeDbznt9w5T7p7DLk5lZFeLVgthmDBFdX5QDTBi5ycXcgRboseNt2FC50t9rmsmlZZNWwB-AGwMKUV03Tb6DcTXjrNu_4vun18Upj4wqWinAeNxlf9DfwHTSosi</recordid><startdate>2021</startdate><enddate>2021</enddate><creator>Somsikova, A. V.</creator><creator>Kostitsyn, Yu. A.</creator><creator>Fedotova, A. A.</creator><creator>Razumovskiy, A. A.</creator><creator>Khain, E. V.</creator><creator>Astrakhantsev, O. V.</creator><creator>Batanova, V. G.</creator><creator>Anosova, M. O.</creator><general>Pleiades Publishing</general><general>Springer</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>L.G</scope></search><sort><creationdate>2021</creationdate><title>Late Neoprotherozoic Granitoid Magmatism of the Baikal-Muya Fold Belt, Ophiolite and Post-Ophiolite Plagiogranites</title><author>Somsikova, A. V. ; Kostitsyn, Yu. A. ; Fedotova, A. A. ; Razumovskiy, A. A. ; Khain, E. V. ; Astrakhantsev, O. V. ; Batanova, V. G. ; Anosova, M. O.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c355t-f00509c6de4d3485a9b66bc1df729fe6e015c373e22eea1405e66f8aba97c8703</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Belts</topic><topic>Chemical composition</topic><topic>Crystallization</topic><topic>Dikes</topic><topic>Dunite</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>Embankments</topic><topic>Gabbro</topic><topic>Gabbros</topic><topic>Geochemistry</topic><topic>Granite</topic><topic>Heterogeneity</topic><topic>Island arcs</topic><topic>Isotopes</topic><topic>Lava</topic><topic>Low concentrations</topic><topic>Magma</topic><topic>Magmatism</topic><topic>Melting</topic><topic>Oceanic crust</topic><topic>Ophiolites</topic><topic>Rocks, Metamorphic</topic><topic>Veins (geology)</topic><topic>Zircon</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Somsikova, A. V.</creatorcontrib><creatorcontrib>Kostitsyn, Yu. A.</creatorcontrib><creatorcontrib>Fedotova, A. A.</creatorcontrib><creatorcontrib>Razumovskiy, A. A.</creatorcontrib><creatorcontrib>Khain, E. V.</creatorcontrib><creatorcontrib>Astrakhantsev, O. V.</creatorcontrib><creatorcontrib>Batanova, V. G.</creatorcontrib><creatorcontrib>Anosova, M. O.</creatorcontrib><collection>CrossRef</collection><collection>Aqualine</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>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Geochemistry international</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Somsikova, A. V.</au><au>Kostitsyn, Yu. A.</au><au>Fedotova, A. A.</au><au>Razumovskiy, A. A.</au><au>Khain, E. V.</au><au>Astrakhantsev, O. V.</au><au>Batanova, V. G.</au><au>Anosova, M. O.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Late Neoprotherozoic Granitoid Magmatism of the Baikal-Muya Fold Belt, Ophiolite and Post-Ophiolite Plagiogranites</atitle><jtitle>Geochemistry international</jtitle><stitle>Geochem. Int</stitle><date>2021</date><risdate>2021</risdate><volume>59</volume><issue>1</issue><spage>12</spage><epage>31</epage><pages>12-31</pages><issn>0016-7029</issn><eissn>1556-1968</eissn><abstract>Three different-age series of granitoid veins and dikes of the Baikal–Muya fold belt were studied. Two of them, plagiogranites of the ophiolite complex and the first postophiolitic plagiogranites, are associated with the suprasubduction ophiolites of the eastern Baikal–Muya belt. The third series is represented by hypabyssal tonalite–plagiogranite–leucogranite complex of the Kichera zone in the western Baikal–Muya belt. The composition and isotope-geochemical characteristics (ε
Nd
(T) = –0.9; –1.3) of the plagiogranite veins no more than 60 cm thick, and ε
Nd
(T) values (–1.8…+ 0.2) of host layered leucocratic gabbros in the Sredne-Mamakan ophiolitic complex are consistent with the previously established suprasubduction nature of the ophiolite association. Tonalites and plagiogranites of the dyke system of the post-ophiolitic magmatic series intersect the dunite–pyroxenite–gabbro banded series of the Sredne-Mamakan ophiolites of the eastern Baikal–Muya fold zone. High Sr/Y ratios and low concentrations of Y and heavy REE indicate that these granitoids are ascribed to the adakite series. LA-ICP-MS study of zircon from post-ophiolitic plagiogranites yields the crystallization age of 629 ± 5 Ma. Sm–Nd isotope-geochemical characteristics of plagiogranitoids (ε
Nd
(T) = +2.5; +4.0) in combination with geochemical data confirm their origin during partial melting of a mafic protolith corresponding to the Neoproterozoic oceanic crust. The adakitic granitoids in the Kichera zone of the western Baikal–Muya belt belong to the tonalite–leucogranite differentiated series of the hypabyssal complex, which has no a direct spatial relationship with unambiguous ophiolite associations. The chemical composition and Sm–Nd isotope-geochemical characteristics of these rocks (ε
Nd
(T) = +3.2…+7.1) indicate the heterogeneity of the predominantly juvenile island-arc or oceanic Neoproterozoic crust, which experienced partial melting at 595 ± 5 Ma.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S0016702921010109</doi><tpages>20</tpages></addata></record> |
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| ispartof | Geochemistry international, 2021, Vol.59 (1), p.12-31 |
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| subjects | Belts Chemical composition Crystallization Dikes Dunite Earth and Environmental Science Earth Sciences Embankments Gabbro Gabbros Geochemistry Granite Heterogeneity Island arcs Isotopes Lava Low concentrations Magma Magmatism Melting Oceanic crust Ophiolites Rocks, Metamorphic Veins (geology) Zircon |
| title | Late Neoprotherozoic Granitoid Magmatism of the Baikal-Muya Fold Belt, Ophiolite and Post-Ophiolite Plagiogranites |
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