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Russian Geology and Geophysics

2007 year, number 9

Alkaline gabbroids of the Chirii outcrop (North Minusa depression): mineralogy and melt evolution

T.Yu. Timina, V.V. Sharygin
Institute of Geology and Mineralogy, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Mineralogy; mineral chemistry; melt inclusions; melt evolution; gabbroids; North Minusa depression
Pages: 737-757


We studied the chemical composition of rock-forming minerals in gabbroids from the Chirii outcrop and the evolutionary features of parental basic melt during the crystallization of these rocks. Results were compared with data for basanites from pipes of the North Minusa depression. The mineralogical composition and thermobarogeochemical data of the gabbroids were examined in detail, and chemical analyses of rock-forming minerals (clinopyroxene, plagioclase, amphibole, biotite, titanomagnetite, and apatite) were carried out. Based on the homogenization temperatures of primary melt inclusions, we established the minimum temperatures and sequence of mineral crystallization in the gabbroids: clinopyroxene (>1160