Results 1 to 10 of about 183 (136)

Timing of Svecofennian crustal growth and collisional tectonics in Åland, SW Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 2004
In an effort to quantify the time parameter in the tectonomagmatic evolution of what has been called the Southern Svecofennian Arc Complex (SSAC) of SW Finland, advanced radiometric dating techniques have here been applied to rock groups of key ...
C. Ehlers, T. Skiöld, M. Vaasjoki
doaj   +2 more sources

Svecofennian intra-orogenic gabbroic magmatism: A case study from Turku, southwestern Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 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.
J. Nevalainen   +4 more
doaj   +3 more sources

The Oripää granite, SW Finland: Characterization and significance in terms of Svecofennian crustal evolution [PDF]

open access: yesBulletin of the Geological Society of Finland, 2001
RAMO, TAPANI and NIRONEN, MIKKO 2001. The Oripaa granite, SW Finland: Characterization and significance in terms of Svecofennian crustal evolution. Bulletin of the Geological Society of Finland 73, Parts 1–2, 103–109.
T. Rämö, M. Nironen
doaj   +2 more sources

Geology and crystallization conditions of the Särkiniemi intrusion and related nickel-copper ore, central Finland – implications for depth of emplacement of 1.88 Ga nickel-bearing intrusions [PDF]

open access: yesBulletin of the Geological Society of Finland, 2020
Several Ni-Cu deposits occur within the Kotalahti area, central Finland, in proximity to an Archaean gneiss dome surrounded by a Palaeoproterozoic craton-margin supracrustal sequence comprising quartzites, limestones, calc-silicate rocks, black schists ...
Hannu V. Makkonen, Pekka Tuisku
doaj   +1 more source

U-Pb zircon determinations from the Keikyä Breccia and other sites in the Svecofennides: indications of a Svecokarelian protocrust [PDF]

open access: yesBulletin of the Geological Society of Finland, 1996
Heterogeneous zircon populations from four different localities within the Svecofennian area in Finland demonstrate that the ca. 1890 Ma old syntectonic granitoids contain older material, probably belonging to the ca. 1950 Ma Svecofennian protocrust, the
M. Vaasjoki, K. Pietikäinen, M. Vaarma
doaj   +1 more source

Rock magnetic investigations constraining relative timing for gold deposits in Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 2011
Palaeomagnetic and anisotropy of magnetic susceptibility (AMS) studies were carried out on a orogenic gold deposit in Jokisivu, located in the western part of the Pirkanmaa Belt in the Svecofennian domain of southern Finland.
S. Mertanen, F. Karell
doaj   +1 more source

Pukala intrusion, its age and connection to hydrothermal alteration in Orivesi, southwestern Finland [PDF]

open access: yesBulletin of the Geological Society of Finland, 2005
The Pukala intrusion is situated in the Paleoproterozoic Svecofennian domain of the Fennoscandian Shield in the contact region between the Central Finland Granitoid Complex and the Tampere Belt.
M. Talikka, I. Mänttäri
doaj   +1 more source

The Pyhäntaka formation, Southern Finland: A sequence of metasandstones and metavolcanic rocks upon an intra-orogenic unconformity [PDF]

open access: yesBulletin of the Geological Society of Finland, 2011
Detrital zircon studies suggest that the few quartzite occurrences in southern Finland are younger than 1.87 Ga and express sedimentation after 1.89–1.87 Ga accretional deformation and metamorphism in the Svecofennian orogenic belt.
M. Nironen
doaj   +1 more source

Supracrustal rocks in the Kuovila area, Southern Finland: Structural evolution, geochemical characteristics and the age of volcanism [PDF]

open access: yesBulletin of the Geological Society of Finland, 2005
The supracrustal rocks of the Kuovila area in the Palaeoproterozoic Svecofennian Uusimaa Belt, southern Finland, consist mainly of volcaniclastic rocks associated with banded iron formations (BIFs) and marbles.
P. Skyttä, A. Käpyaho, I. Mänttäri
doaj   +1 more source

Pre-1.91 Ga deformation and metamorphism in the Palaeoproterozoic Vammala Migmatite Belt, southern Finland, and implications for Svecofennian tectonics [PDF]

open access: yesBulletin of the Geological Society of Finland, 2004
A metamorphic event in the Vammala Migmatite Belt (VMB) at ~1.92 Ga, revealed by SHRIMP U-Pb analyses of both zircon overgrowths and monazite, is interpreted as post-depositional and is correlated with the development of the early high-grade schistosity.
R.W.R. Rutland   +2 more
doaj   +1 more source

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