The GGT/SVEKA Transect: Structure and Evolution of the Continental Crust in the Paleoproterozoic Svecofennian Orogen in Finland

Korsman, Kalevi; Korja, T.; Pajunen, Matti; Virransalo, Petri; Ggt,

doi:10.1080/00206819909465144

Cited by 181 publications

(122 citation statements)

References 64 publications

Supporting

Mentioning

110

Contrasting

Unclassified

Order By: Relevance

“…Indeed, recent models on the Svecofennian evolution (e.g. Nironen, 1997;Korsman et al, 1999; suggest that the juvenile crustal components were assembled by ~1.87 Ga and that the emplacement of the migmatizing microcline granites was related either to transpressional intraplate tectonism (Ehlers et al, 1993) or extensional collapse after the cessation of the main compressive phase (Korja & Heikkinen, 1995;Korsman et al, 1999).…”

Section: Concepts Of the Evolution Of The Svecofennian Orogeny In Finmentioning

confidence: 99%

“…Rather, the range in the initial Nd isotope composition of the lateorogenic granites complies with the variation shown by the synorogenic granitoids of the surrounding orogenic crust (the arc complex of southern Finland; cf. Korsman et al, 1999). The available data on the synorogenic granitoids show a bimodal distribution with the southwesternmost part of the terrane having the least radiogenic ε Nd values ( Fig.…”

Section: Regional Implicationsmentioning

confidence: 99%

“…Also shown is the composition of the Pöytyä granodiorite and that of six previously analyzed synorogenic granitoids from the surrounding crust (arc complex of southern Finland; cf. Korsman et al, 1999) according to Huhma (1986) and Patchett & Kouvo (1986). Solid and dashed lines denote the evolution of the individual samples.…”

Section: General Implicationsmentioning

confidence: 99%

See 2 more Smart Citations

U-Pb ages and Nd isotope characteristics of the lateorogenic, migmatizing microcline granites in southwestern Finland

Kurhila¹,

Vaasjoki²,

Mänttäri³

et al. 2005

Bull Geol Soc Finland

View full text Add to dashboard Cite

U-Pb ages and whole-rock Nd isotope data have been obtained from the Paleoproterozoic lateorogenic migmatizing microcline granites of southwestern Finland. Isotope dilution and ion microprobe U-Pb data on zircons and monazites show that the age spectrum of these granites is at least 1.85-1.82 Ga. Commonly, zircons and monazites record the same ages. The age variation in the Veikkola granite area is of the order of 25 Ma and indicates that this seemingly homogeneous granite consists of two separate intrusions. The zircons of the lateorogenic granites are pervasively altered and conventional U-Pb results are commonly discordant. The ion microprobe studies reveal that the granites contain very few inherited zircons with preserved original U-Pb isotope ratios, with the exception of the Oripää granite. Initial ε Nd values, mostly in the range of -0.5 to -1.0, imply a moderate input of older crustal material into most of the lateorogenic granites. A shift from more juvenile to less radiogenic Nd isotope composition is observed from north to south, and the variation pattern of ε Nd values of the lateorogenic granites is thus similar to that of the surrounding synorogenic granitoid rocks.

show abstract

Section: Concepts Of the Evolution Of The Svecofennian Orogeny In Finmentioning

confidence: 99%

Section: Regional Implicationsmentioning

confidence: 99%

See 1 more Smart Citation

U-Pb ages and Nd isotope characteristics of the lateorogenic, migmatizing microcline granites in southwestern Finland

Kurhila¹,

Vaasjoki²,

Mänttäri³

et al. 2005

Bull Geol Soc Finland

View full text Add to dashboard Cite

show abstract

“…It has previously been assumed that metamorphism was younger in southeastern Finland than elsewhere in southern Finland (Korsman et al 1999). As the geochronology dataset for this large region of Finland has developed it now seems more likely that the whole belt, including Bergslagen in Sweden, preserves evidence of long-lasting late Svecofennian heat flow.…”

Section: Regional Implicationsmentioning

confidence: 99%

“…The original volcanic and volcano-sedimentary formations were subject to multistage deformation and metamorphism, resulting in a complex mosaic of the Svecofennian Orogen (e.g. Ehlers et al, 1993;Nironen, 1997;Korsman et al, 1999;Korja & Heikkinen, 2005;Lahtinen et al, 2005). Because of deformation partitioning, part of the Orijärvi area escaped the most severe overprinting tectonometamorphism and, therefore, makes an excellent locality to study the early Svecofennian crustal growth in southern Finland (Ploegsma & Westra, 1990;Skyttä et al, 2006).…”

Section: Geological Settingmentioning

confidence: 99%

U-Th-Pb zircon geochronology on igneous rocks in the Toija and Salittu Formations, Orijärvi area, southwestern Finland: Constraints on the age of volcanism and metamorphism

Väisänen¹,

Kirkland²

2008

Bull Geol Soc Finland

View full text Add to dashboard Cite

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 crystals from the felsic rock preserve a two-stage crystallisation history with zoned core domains and homogeneous rim domains. Inner domains yield a 1878 ± 4 Ma concordia age, interpreted to determine the crystallisation of this rock. Rims yield a 1815 ± 3 Ma concordia age interpreted to determine the regional metamorphism. Small rounded zircon grains from the Salittu gabbro, located within the Jyly shear zone, yield a concordia age of 1792 ± 5 Ma. We interpret the grain textures to suggest that they recrystallised from inherited zircon seeds during the heat and fluid flow into the shear zone. Although no direct ages for the Salittu Formation have been recovered, field relationships imply that it was deposited between 1878 − 1875 Ma.

show abstract

FIRE3&3a

Korja¹,

Heikkinen²,

Tiira

et al. 2018

Atlas of Structural Geological Interpretation From Seismic Images

View full text Add to dashboard Cite

The GGT/SVEKA Transect: Structure and Evolution of the Continental Crust in the Paleoproterozoic Svecofennian Orogen in Finland

Cited by 181 publications

References 64 publications

U-Pb ages and Nd isotope characteristics of the lateorogenic, migmatizing microcline granites in southwestern Finland

U-Pb ages and Nd isotope characteristics of the lateorogenic, migmatizing microcline granites in southwestern Finland

U-Th-Pb zircon geochronology on igneous rocks in the Toija and Salittu Formations, Orijärvi area, southwestern Finland: Constraints on the age of volcanism and metamorphism

FIRE3&3a

Contact Info

Product

Resources

About