Calcic Garnets as a Source of Information on the Age of Ultramafic Alkaline Intrusions in the Kola Magmatic Province

Autor:	E. B. Sal’nikova, A. B. Kotov, A. A. Arzamastsev, V. Yu. Grozdev, M. V. Stifeeva
Rok vydání:	2020
Předmět:	geography geography.geographical_feature_category 020209 energy Geochemistry 02 engineering and technology Massif 010502 geochemistry & geophysics 01 natural sciences Geochemistry and Petrology Ultramafic rock Magmatism 0202 electrical engineering electronic engineering information engineering Geology 0105 earth and related environmental sciences
Zdroj:	Petrology. 28:62-72
ISSN:	1556-2085 0869-5911
DOI:	10.1134/s0869591120010063
Popis:	The paper presents data of U–Pb (ID-TIMS) geochronologic studies of schorlomite–morimotoite–andradite garnet from the Vuoriyarvi, Sallanlatva, and Salmagorsky massifs in the Kola alkaline province. The garnet is relatively rich in U (5–9 ppm) and poor in common Pb (Pbc/Pbt = 0.2–0.7), contains U as an isomorphous component, and does not host inclusions of any U-bearing minerals. The U–Pb ages of garnet from the various rocks of the massifs (373 ± 2 to 377 ± 1 Ma) are mutually consistent and correspond to the main pulse of alkaline ultramafic magmatism in the Kola province (360–380 Ma). The geochronologic data indicate that the U–Pb system of schorlomite–morimotoite–andradite garnet is stable and can be utilized as a reliable geochronometer for alkaline ultramafic rocks.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4b420a2e2a1b71ce60fa7d9c00cefda9 https://doi.org/10.1134/s0869591120010063 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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