Zobrazeno 1 - 10
of 165
pro vyhledávání: '"M. Väisänen"'
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 88, Iss 2, Pp 85-103 (2016)
Because of the relatively low metamorphic grade, low strain and well-preserved early structures in volcanic and volcaniclastic rocks, the Orijärvi triangle (in the center of the larger Orijärvi area) is one of the few locations in the Svecofennian
Externí odkaz:
https://doaj.org/article/95fb62d4e0674815b9654078d21875ba
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 86, Iss 2, Pp 93-112 (2014)
Using single-grain zircon U-Pb dating by LA-MC-ICPMS and whole-rock geochemistry, we have studied the Palaeoproterozoic gabbroic rocks from Moisio in southwest Finland. Three ages were obtained. The interpreted intrusion age is ~1.86 Ga, which places
Externí odkaz:
https://doaj.org/article/2b1b4ab91f634ef398561c1a86055cd7
Publikováno v:
Geologica Acta, Vol 16, Iss 1 (2016)
The earliest Svecofennian magmatism in southern Finland has been dated at 1.90-1.88Ga. As an example of this, the Orijärvi (ca. 1.89Ga) and Enklinge (ca. 1.88Ga) volcanic centres comprise bimodal plutonic batholiths surrounded by volcanic rocks of c
Externí odkaz:
https://doaj.org/article/5df782e4a5f14be496fcc2c8a76aefa5
Autor:
M. Väisänen, C.L. Kirkland
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 80, Iss 2, Pp 73-87 (2008)
Zircons from a felsic volcanic rock in the Toija Formation and a synvolcanic gabbro intrusion in the Salittu Formation within the Orijärvi area were dated by U-Th-Pb SIMS in order to provide depositional constraints on these formations. Zircon cryst
Externí odkaz:
https://doaj.org/article/d66f3df1c24c418f9d21400c7794e852
Autor:
M. Väisänen, G. Westerlund
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 79, Iss 2, Pp 127-141 (2007)
Twenty two samples were analysed from mafic and intermediate volcanic rocks from the Turku area along ~60 km long north-south geotraverse. Geographically and lithologically the samples were divided into the Pargas, Turku and Vahto groups. The Pargas
Externí odkaz:
https://doaj.org/article/dba55db599214e91a2e6f5a769543c5a
Autor:
M. Väisänen, I. Mänttäri
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 74, Iss 1-2, Pp 185-214 (2002)
The Orijärvi area within the Uusimaa Belt is a key area in resolving the stratigraphy and tectonic setting of the Southern Svecofennian Arc Complex in southern Finland. Based on field relationships, geochemistry and radiometric age determinations, t
Externí odkaz:
https://doaj.org/article/3013df2ebceb4886b1dfe96f689a0fb5
Autor:
M. Väisänen, P. Hölttä
Publikováno v:
Bulletin of the Geological Society of Finland, Vol 71, Iss 1, Pp 177-218 (1999)
The Turku migmatite complex in southwestern Finland is a representative area for the type of tectonic and metamorphic evolution seen within the Palaeoproterozoic Svecofennian Orogen in southern Finland. The orogeny can be divided into early, late and
Externí odkaz:
https://doaj.org/article/70e409e75cc14274890523b1d9df4c69
Publikováno v:
Geologica Acta, Vol 10, Iss 4 (2013)
The Palaeoproterozoic Svecofennian orogen in the Fennoscandian shield is an arc accretionary orogen that was formed at c. 1.92-1.86Ga. Arc accretion, magmatism and the subsequent continent-continent collision thickened the crust up to c. 70km, formin
Externí odkaz:
https://doaj.org/article/f12b1f670ec341dbaee4314c6dcb0483
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Akademický článek
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