Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data
U–Pb (SIMS and LA-ICP-MS) age estimates are obtained for the Egdygkychsky complex of rocks of hypabyssal intrusions of Nichansky and Vukneysky plutons and volcanic rocks and tuffs of host rocks of the Oloy volcanic belt in the Alazey-Oloy fold belt. The Oloy volcanic belt is overlapping for a number...
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Online Access: | https://doi.org/10.21638/spbu07.2019.303 http://hdl.handle.net/11701/16756 |
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ftstpetersburgun:oai:dspace.spbu.ru:11701/16756 2023-05-15T15:54:55+02:00 Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data Kara, Taras V. Luchitskaya, Marina V. Katkov, Sergey M. Belousova, Elena A. 2019-09 https://doi.org/10.21638/spbu07.2019.303 http://hdl.handle.net/11701/16756 ru rus St Petersburg State University Vestnik of St Petersburg University. Earth Sciences;Volume 64; Issue 3 Kara T. V., Luchitskaya M. V., Katkov S. M., Belousova E. A. (2019). Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data. Vestnik of Saint Petersburg University. Earth Sciences, 64 (3), 421–433. https://doi.org/10.21638/spbu07.2019.303 http://hdl.handle.net/11701/16756 Oloy volcanic belt Egdygkychsky complex terrane Nichansky and Vukneysky plutons U–Pb dating zircon Article 2019 ftstpetersburgun https://doi.org/10.21638/spbu07.2019.303 2019-12-10T00:47:10Z U–Pb (SIMS and LA-ICP-MS) age estimates are obtained for the Egdygkychsky complex of rocks of hypabyssal intrusions of Nichansky and Vukneysky plutons and volcanic rocks and tuffs of host rocks of the Oloy volcanic belt in the Alazey-Oloy fold belt. The Oloy volcanic belt is overlapping for a number of island arc terranes of the Alazey-Oloy fold belt. Nichansky and Vukneysky plutons are located in the southwestern part of the Yarakvaamsky terrane and are composed of rocks of Early Cretaceous Egdygkychsky gabbro-monzonite-syenite and Vesenninsky granodiorite-diorite complexes. Host strata for both plutons are volcanic-terrigenous and volcanic rocks of the Upper Jurassic–Lower Cretaceous periods. U–Pb SIMS zircon сoncordant age from three samples of rocks of the Nichansky pluton is 141,1 ± 0,4 Ma. The weighted mean zircon age of quartz monzodiorites was dated by U–Pb LA-ICP-MS as 140 ± 3 Ma.; this overlaps with the U–Pb SIMS age within error. U–Pb SIMS concordant zircon ages for the Vukneysky pluton is 142,6 ± 0,4 Ma.; dacite and felsic tuff from host strata— 147 ± 2 and 147 ± 3 Ma. Affinities of zircon morphology for all analyzed samples and Th/U ratios in them indicate their magmatic genesis. This makes it possible to consider obtained age estimates as the crystallization age of the Egdygkychsky complex of Nichansky and Vukneysky plutons and the time interval of host strata (volcanic rocks and tuffs) formation. New U–Pb geochronological data allow researchers to confidently distinguish a single volcanic-plutonic assemblage of Late Jurassic (Tithonian)–Early Cretaceous (Beriasian-Valanginian) age of the Oloy volcanic belt. Obtained data may be used for more distinct age limits of Au–Mo–Cu mineralization, located at the contacts between the Egdydkychsky compleх rocks and host volcanic-sedimentary rocks or at the contacts between separated intrusive phases of the complex. U–Pb SIMS dating of zircons from Egdygkychsky complex of Nichansky, Vukneysky plutons and host rocks was supported by the Russian Science Foundation (grant no. № 18-77-10073), and U–Pb LAICP- MS dating of zircons from the second phase of Nichansky pluton, in accordance with research plan of GIN RAS. Article in Journal/Newspaper Chukotka Saint Petersburg State University: Research Repository (DSpace SPbU) Vestnik of Saint Petersburg University. Earth Sciences 64 3 421 433 |
institution |
Open Polar |
collection |
Saint Petersburg State University: Research Repository (DSpace SPbU) |
op_collection_id |
ftstpetersburgun |
language |
Russian |
topic |
Oloy volcanic belt Egdygkychsky complex terrane Nichansky and Vukneysky plutons U–Pb dating zircon |
spellingShingle |
Oloy volcanic belt Egdygkychsky complex terrane Nichansky and Vukneysky plutons U–Pb dating zircon Kara, Taras V. Luchitskaya, Marina V. Katkov, Sergey M. Belousova, Elena A. Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data |
topic_facet |
Oloy volcanic belt Egdygkychsky complex terrane Nichansky and Vukneysky plutons U–Pb dating zircon |
description |
U–Pb (SIMS and LA-ICP-MS) age estimates are obtained for the Egdygkychsky complex of rocks of hypabyssal intrusions of Nichansky and Vukneysky plutons and volcanic rocks and tuffs of host rocks of the Oloy volcanic belt in the Alazey-Oloy fold belt. The Oloy volcanic belt is overlapping for a number of island arc terranes of the Alazey-Oloy fold belt. Nichansky and Vukneysky plutons are located in the southwestern part of the Yarakvaamsky terrane and are composed of rocks of Early Cretaceous Egdygkychsky gabbro-monzonite-syenite and Vesenninsky granodiorite-diorite complexes. Host strata for both plutons are volcanic-terrigenous and volcanic rocks of the Upper Jurassic–Lower Cretaceous periods. U–Pb SIMS zircon сoncordant age from three samples of rocks of the Nichansky pluton is 141,1 ± 0,4 Ma. The weighted mean zircon age of quartz monzodiorites was dated by U–Pb LA-ICP-MS as 140 ± 3 Ma.; this overlaps with the U–Pb SIMS age within error. U–Pb SIMS concordant zircon ages for the Vukneysky pluton is 142,6 ± 0,4 Ma.; dacite and felsic tuff from host strata— 147 ± 2 and 147 ± 3 Ma. Affinities of zircon morphology for all analyzed samples and Th/U ratios in them indicate their magmatic genesis. This makes it possible to consider obtained age estimates as the crystallization age of the Egdygkychsky complex of Nichansky and Vukneysky plutons and the time interval of host strata (volcanic rocks and tuffs) formation. New U–Pb geochronological data allow researchers to confidently distinguish a single volcanic-plutonic assemblage of Late Jurassic (Tithonian)–Early Cretaceous (Beriasian-Valanginian) age of the Oloy volcanic belt. Obtained data may be used for more distinct age limits of Au–Mo–Cu mineralization, located at the contacts between the Egdydkychsky compleх rocks and host volcanic-sedimentary rocks or at the contacts between separated intrusive phases of the complex. U–Pb SIMS dating of zircons from Egdygkychsky complex of Nichansky, Vukneysky plutons and host rocks was supported by the Russian Science Foundation (grant no. № 18-77-10073), and U–Pb LAICP- MS dating of zircons from the second phase of Nichansky pluton, in accordance with research plan of GIN RAS. |
format |
Article in Journal/Newspaper |
author |
Kara, Taras V. Luchitskaya, Marina V. Katkov, Sergey M. Belousova, Elena A. |
author_facet |
Kara, Taras V. Luchitskaya, Marina V. Katkov, Sergey M. Belousova, Elena A. |
author_sort |
Kara, Taras V. |
title |
Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data |
title_short |
Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data |
title_full |
Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data |
title_fullStr |
Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data |
title_full_unstemmed |
Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data |
title_sort |
late jurassic–early cretaceous volcanic-plutonic assemblage of oloy belt, western chukotka: u–pb sims and la-icpms data |
publisher |
St Petersburg State University |
publishDate |
2019 |
url |
https://doi.org/10.21638/spbu07.2019.303 http://hdl.handle.net/11701/16756 |
genre |
Chukotka |
genre_facet |
Chukotka |
op_relation |
Vestnik of St Petersburg University. Earth Sciences;Volume 64; Issue 3 Kara T. V., Luchitskaya M. V., Katkov S. M., Belousova E. A. (2019). Late jurassic–early cretaceous volcanic-plutonic assemblage of Oloy belt, Western Chukotka: U–Pb SIMS AND LA-ICPMS data. Vestnik of Saint Petersburg University. Earth Sciences, 64 (3), 421–433. https://doi.org/10.21638/spbu07.2019.303 http://hdl.handle.net/11701/16756 |
op_doi |
https://doi.org/10.21638/spbu07.2019.303 |
container_title |
Vestnik of Saint Petersburg University. Earth Sciences |
container_volume |
64 |
container_issue |
3 |
container_start_page |
421 |
op_container_end_page |
433 |
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1766390151003504640 |