THE OLDEST VOLCANIC GLASS IN THE EARLY PALEOPROTEROZOIC BONINITE-TYPE LAVAS, KARELIAN CRATON: RESULTS OF INSTRUMENTAL INVESTIGATIONS Статья Sharkov E.V., Trubkin N.V., Krasivskaya I.S., Bogatikov O.A., Mokhov A.V., Zolotykh E.B., Ladygin V.M., Chistyakov A.V., Evseeva K.A. Doklady Earth Sciences. Том 390. 2003. С. 580-584