Results 111 to 120 of about 183 (136)
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Settings of Meteorite Impact Structures in the Svecofennian Crustal Domain
2005The Svecofennian Domain, located on the western part of the East European Craton, is a uniform crustal segment with an age of the basement of ~1.9 Ga. Together with younger (1.5 – 1.8 Ga) transition zones it occupies an area of ~1.56 × 106 km2. The domain unites shield and platform areas including the submerged Baltic Sea.
Väino Puura, Jüri Plado
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A case study of lateral spreading: the Precambrian Svecofennian Orogen
Geological Society, London, Special Publications, 2009Abstract We have studied the crustal structures of the Palaeoproterozoic Svecofennian ( c. 1.9 Ga) Orogeny with the help of large scale seismic reflection surveys (FIRE 1–3), preliminary structural field work and geological and geophysical databases.
Annakaisa Korja +2 more
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The Svecofennian gabbro-hosted Koivusaarenneva magmatic ilmenite deposit, Kälviä, Finland
Mineralium Deposita, 2003The Svecofennian Koivusaarenneva gabbro at Kalvia, Finland, is a small intrusion emplaced at 1881 Ma into tonalitic bedrock near the boundary of the Mid Finland granitoid complex. The intrusion is mainly composed of even-grained metamorphosed gabbro, which can be subdivided into three zones. The lower, middle and upper zones are recognized on the basis
Niilo K. Kärkkäinen +1 more
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Chapter 8 Svecofennian supracrustal rocks
2005Publisher Summary A substantial part of the Paleoproterozoic crust of southern and central Finland is characterized by 1.92 Ga turbiditic sedimentary and - 1.90-1.88 Ga arc-type volcanic rocks. Fluvial to shallow-water sedimentary rocks, felsic schists, sedimentary carbonates, black shales, and MORB- and WPL-like basalts are locally also common.
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Early Proterozoic Svecofennian volcanism and associated plutonism in Enklinge, SW Finland
Precambrian Research, 1990Abstract The c. 1.9 Ga old Enklinge volcano-plutonic centre is part of the Svecofennian province of SW Finland. The rocks of the area consist of an early subaquatic extrusion of mafic/intermediate to rhyolitic volcanics underlain by marbles, graywackes and quartz-feldspar-rich volcanoclastic sediments.
Carl Ehlers, Alf Lindroos
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Calcite and dolomite relations in Svecofennian carbonate rocks
Geologiska Föreningen i Stockholm Förhandlingar, 1962Abstract In this paper, the author summarizes his investigations into the occurence and distribution of dolomite and magnesium-silicate minerals in Svecofennian carbonate rocks. As a result of his investigations, the author has come to the conclusion that it is very probable that dolomite rocks have originated in a prehistoric sea, either by direct ...
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A geotectonic model for the evolution of the Svecofennian Orogen
GFF, 1996(1996). A geotectonic model for the evolution of the Svecofennian Orogen. GFF: Vol. 118, No. sup004, pp. 21-22.
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Post-Svecofennian plastic and brittle-plastic shear zones in westernmost Bergslagen, Sweden
Geologiska Föreningen i Stockholm Förhandlingar, 1990(1990). Post-Svecofennian plastic and brittle-plastic shear zones in westernmost Bergslagen, Sweden. Geologiska Foreningen i Stockholm Forhandlingar: Vol. 112, No. 2, pp. 204-205.
Carl-Henric Wahlgren +1 more
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Late‐orogenic Svecofennian deformation in SW Finland constrained by pegmatite emplacement ages
Terra Nova, 1996ABSTRACTLate stages of the Svecofennian orogeny in SW Finland were related to a tranpressional stress field and dextral movements along crustal scale shear zones under decreasing temperature and pressure conditions. In the Kemiö area, a minimum estimate for the time span of movements along one of these shear zones is obtained from the ages of 1840 to ...
Alf Lindroos +3 more
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Chapter 9 Svecofennian mafic-ultramafic intrusions
2005Publisher Summary Mafic-ultramafic plutonic rocks emplaced during Precambrian orogenic episodes are a poorly defined category of intrusions. This is not only because of the long tectonometamorphic history of such terrains and scarcity of young analogies (deeply eroded oceanic or continental arcs), but also because orogenic emplacement of magmas is ...
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