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Where might one find the oldest rocks of the European continent?
Question
#72666. Asked by zbeckabee. (Nov 26 06 1:24 PM)
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ainenei
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The Baltic Shield (sometimes referred to as the Fennoscandian Shield) is located in Fennoscandia (Norway Sweden and Finland), northwest Russia and under the Baltic Sea. The Baltic Shield is defined as the "exposed" Precambrian northwest segment of the East European Craton. It is composed mostly of Archean and Proterozoic gneisses and greenstone which have undergone numerous deformations through tectonic activity. The Baltic Shield contains the oldest rocks of the European continent with a thickness of 250-300 km., and is still rebounding today from the thick glacials during the Quaternary Period.
http://www.answers.com/topic/baltic-shield
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skysmom65
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The Baltic Shield (or Fennoscandian Shield) is a segment of the Earth's crust belonging to the East European Craton, representing a large part of Fennoscandia, northwestern Russia and the northern Baltic Sea. It is composed mostly of Archean and Proterozoic gneisses and greenstone which have undergone numerous deformations through tectonic activity. It contains the oldest rocks of the European continent with a thickness of 250-300 km.
The Baltic Shield is divided into five provinces: the Svecofennian and Sveconorwegian (or Southwestern gneiss) provinces in Fennoscandia, and the Karelian, Belmorian and Kola provinces in Russia. The latter three are divided further into several blocks and complexes and contain the oldest of the rocks, at 2500-3100 Ma (million years) old. The youngest rocks belong to the Sveconorwegian province, at 900-1700 Ma old. Sometimes included as part of the Baltic Shield is the East European Platform (or Russian Platform), an area of western Russia covered by 3 km of sedimentary rock.
http://www.amazines.com/Fennoscandian_shield_related.html
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