Email this article Andradite–Morimotoite Garnets as Promising U–Pb Geochronometers for Dating Ultrabasic Alkaline Rocks
- Authors: Salnikova E.B.1, Stifeeva M.V.1, Nikiforov A.V.2, Yarmolyuk V.V.2, Kotov A.B.1, Anisimova I.V.1, Sugorakova A.M.3, Vrublevskii V.V.4
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Affiliations:
- Institute of Precambrian Geology and Geochronology
- Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry
- Tuva Institute for Complex Exploration of Natural Resources, Siberian Branch
- National Research Tomsk State University
- Issue: Vol 480, No 2 (2018)
- Pages: 778-782
- Section: Geochemistry
- URL: https://ogarev-online.ru/1028-334X/article/view/193398
- DOI: https://doi.org/10.1134/S1028334X18060168
- ID: 193398
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Abstract
U–Pb geochronological studies of garnet of the andradite–morimotoite series and Sm–Nd geochronological studies of this garnet and apatite from the Chikskii Massif (Tuva-Mongolia microcontinent) were carried out. The garnet studied is characterized by relatively high concentrations of U (14–16 ppm) and by a low level of common Pb (Pbс/Pbt = 0.07–0.1). The concordia age of garnet is 492 ± 2 Ma (MSWD = 0.01, probability 92%) and matches within the error with the Sm–Nd age determined by the isochrone for apatite, garnet, and bulk rock (489 ± 9 Ma, MSWD = 0.86). This allows us to consider calcic garnets of the andradite–morimotoite series as promising mineral geochronometers for U–Pb dating of ultrabasic alkaline rocks.
About the authors
E. B. Salnikova
Institute of Precambrian Geology and Geochronology
Author for correspondence.
Email: katesalnikova@yandex.ru
Russian Federation, St. Petersburg, 199034
M. V. Stifeeva
Institute of Precambrian Geology and Geochronology
Email: katesalnikova@yandex.ru
Russian Federation, St. Petersburg, 199034
A. V. Nikiforov
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry
Email: katesalnikova@yandex.ru
Russian Federation, Moscow, 119017
V. V. Yarmolyuk
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry
Email: katesalnikova@yandex.ru
Russian Federation, Moscow, 119017
A. B. Kotov
Institute of Precambrian Geology and Geochronology
Email: katesalnikova@yandex.ru
Russian Federation, St. Petersburg, 199034
I. V. Anisimova
Institute of Precambrian Geology and Geochronology
Email: katesalnikova@yandex.ru
Russian Federation, St. Petersburg, 199034
A. M. Sugorakova
Tuva Institute for Complex Exploration of Natural Resources, Siberian Branch
Email: katesalnikova@yandex.ru
Russian Federation, Kyzyl, 667007
V. V. Vrublevskii
National Research Tomsk State University
Email: katesalnikova@yandex.ru
Russian Federation, Tomsk, 634050
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