Late Cretaceous Right-Kyrin massif of alkali-feldspar granites (Verkhoyano-Kolyma orogeny region)
https://doi.org/10.31242/2618-9712-2020-25-3-3
Abstract
The article deals with the specific composition of late Cretaceous granites of the Right-Kyrin massif of alkali-feldspar granites localized on the border of the Selennyakh synclinorium and the TasKhayakhtakh anticlinorium of the Verkhoyano-Kolyma orogenic region and accompanied by rare-earth mineralization. The isotopic age of granites is 85–94 million years. It is shown that the granites belong to the A-type of post-threshold geodynamic environment. The parent melt was generated in deeply metamorphosed lower crust substrates under the influence of heat and fluids produced by deep mantle magmas. Granites are characterized by a high degree of differentiation, increased alkalinity, a combination of hightemperature, characteristic of the main rocks, and low-temperature, «granite», rock-forming and accessory minerals; and a substantial role of chlorine in crystallization. Based on these features and the presence of trachydolerite dikes in the contour of the massif and its exocontacts, it is assumed that there are main melts within the territory of the buried hearth, the activation of which in the late Cretaceous caused repeated melting of crustal substrates.
Keywords
granites,
geodynamic environment,
magma generation substrates,
typomorphism of minerals,
mantle-crustal interaction
Supporting agencies: The author expresses graditude to all emploees who performed analytical research. Special thanks to S.P. Roev for his help in preparing the graphic material for this article.
About the Author
V. A. Trunilina
Diamond and Precious Metal Geology Institute SB RAS
Russian Federation
Russian Federation
TRUNILINA Vera Arkadievna, doctor of geological and mineralogical sciences, chief researcher
39 Lenina pr., Yakutsk 677980
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Review
For citations:
Trunilina V.A. Late Cretaceous Right-Kyrin massif of alkali-feldspar granites (Verkhoyano-Kolyma orogeny region). Arctic and Subarctic Natural Resources. 2020;25(3):27-39. (In Russ.) https://doi.org/10.31242/2618-9712-2020-25-3-3
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