Year: 2024
Type: article
Abstract: Large (up to 4 cm) crystals of euhedral olivine and its intergrowths with clinopyroxene were discovered in the alkali-basaltoid dikes of the Western Sangilen, South-Eastern Tuva. The composition of olivine (Mg# 81–83, NiO 0.2–0.3 wt. %) differs sharply from the composition of olivines from mantle and gabbroid parageneses. It is shown that olivine is a liquidus phase that crystallized from an alkali basaltic melt at pressures of 10–13 kbar in intermediate magma chambers located at depths of 34–43 km, which corresponds to the level of the crust-lithospheric mantle boundary for the Western Sangilen.
Institution: V.S. Sobolev Institute of Geology and Mineralogy
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4405351524