page_title: Geology of Finland
section_title: Kola Domain
hierarchical_section_title: Geology of Finland / Precambrian shield / Kola Domain
caption_attribution_description: Suomi: Ukonkivi eli Ukonsaari Inarijärvellä Inarissa English: Ukonkivi (Ukonsaari) island in lake Inari, Finnish Lapland Русский: Остров Уконкиви. Озеро Инари, Финляндия
context_page_description: The geology of Finland is made up of a mix of geologically very young and very old materials. Common rock types are orthogneiss, granite, metavolcanics and metasedimentary rocks. On top of these lies is a widespread thin layer of unconsolidated deposits formed in connection to the Quaternary ice ages, for example eskers, till and marine clay. The topographic relief is rather subdued because mountain massifs were worn down to a peneplain long ago.
context_section_description: The extreme northeast of Finland is part of the Kola Domain because it shows considerable affinity with the geology of the Kola Peninsula in Russia. Around Lake Inari there are paragneiss, orthogneiss and greenstone belts. Rocks in this part of Finland are of Archean and Proterozoic age.
  To the south and west of Lake Inari lies an elongate and arcuate zone of granulite rock known as the Lapland Granulite Belt. The belt is up to 80 km wide. The main rocks of the belt are migmatized greywacke and argillites. Studies of detrital zircon show that the sedimentary protolith of the metamorphic rocks of the belt could not be more than 2900–1940 million years old. The belt has norite and enderbite intrusions of calc-alkaline chemistry.
caption: Kola Domain rocks of Ukonkivi island in Lake Inari
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