basic plagioclase
1.Single-zircon U-Pb dating of diopside-hornblende-plagioclase leptynite yielded an upper intercept age of 2525 Ma±41 Ma and an lower intercept age of 460 Ma±37 Ma, which represent the age of basic volcanic rocks, i.e. the Buyant Group-complex, and the age of emplacement of the Ordovician magma and modification of the Buyant Group-complex, respectively.
