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Early island-arc granitoids of the Shchuchinskaya zone of the Polar Urals: U–Pb (SIMS) zircon isotope data

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Moscow University Geology Bulletin : Volume 72, Issue 1, January 2017

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Moscow University Geology Bulletin : Volume 69

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Early island-arc granitoids of the Shchuchinskaya zone of the Polar Urals: U–Pb (SIMS) zircon isotope data

Content Provider	Springer Nature Link
Author	Sobolev, I. D. Shadrin, A. N. Rastorguev, V. A. Kozyreva, D. A.
Copyright Year	2017
Abstract	Granitoids of the Rechnoy and Yalya-Pe paleovolcanoes, which were ascribed to the Silurian Khoimpe complex during a geological mapping, and granitoids of the Nganotsky-1 and Nganotsky-2 plutons that were ascribed to the Early Devonian Yunyaga complex were studied in the Shchuchinskaya zone of the Polar Urals. It was established that according to the mineral and chemical compositions the rocks of the plutons studied correspond to island-arc granitoids of I-type. Zircons from granitoids of the Rechnoy and Yalya-Pe paleovolcanoes and the Nganotsky-1 pluton yielded concordant U–Pb (SIMS) isotope ages of 456 ± 6, 454 ± 4, and 463 ± 3 Ma, respectively, which indicates the existence of an island arc within the Shchuchinskaya zone starting from the Middle–Late Ordovician. Based on the obtained zircon ages of granitoids, the country volcanics were ascribed to the Syaday Formation; the upper stratigraphic boundary of their formation was specified as the Middle–Upper Ordovician.
Starting Page	115
Ending Page	125
Page Count	11
File Format	PDF
ISSN	01458752
Journal	Moscow University Geology Bulletin
Volume Number	72
Issue Number	2
e-ISSN	19348436
Language	English
Publisher	Allerton Press
Publisher Date	2017-07-25
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polar Urals granitoids zircons U–Pb geochronology island arc magmatism geochemistry Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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