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Petrographic investigation of metagabbro from the Avesta area
Åsa Lundin (BSc student)

Microphotograph of Avesta gabbro.

Meta-igneous rocks can provide information about the mineralogy and chemical composition of the magma in which they grew or were altered. Textures reflect (re) crystallization processes, while the mineralogy and mineral composition reflects the the pressure and temperature of (re)crystallization. This study investigates metagabbros in the Bergslagen region.  Petrographic descriptions combined with mineral chemical analysis, define metamorphic conditions from upper- to lower-amphibolite facies conditions.