Sm-Nd garnet and U-Pb monazite dating of high-grade metamorphism and crustal melting in the West Uusimaa area, southern Finland

Mouri, Hassina; Väisänen, Markku; Huhma, Hannu; Korsman, Kalevi

doi:10.1080/11035890501272123

Cited by 36 publications

(36 citation statements)

References 29 publications

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“…Nine ionmicroprobe ages on granites and pegmatites from the West Uusimaa area (Skyttä & Mänttäri, 2008) apparently form three age groups. Five of the granites are coeval, within error, with the 1815 ± 3 Ma metamorphism reported here, three of the granites are coeval with the 1832 ± 2 Ma mesosome monazites reported by Mouri et al (2005) and one of the granites is older at 1843 ± 3 Ma. The oldest granite has so far no proved metamorphic counterpart in the West Uusimaa area although it was obviously derived from crustal melting.…”

Section: Regional Implicationsmentioning

confidence: 56%

“…High temperature conditions prevailed in the West Uusimaa area at 1815 Ma whereas Sm-Nd garnet ages indicate that metamorphic temperatures had cooled to around 650°C at c. 1.80 Ga (Mouri et al, 2005). This indicates that either the 1792 Ma zircons crystallised at rather low temperatures or high heat flow/fluid flow was localised.…”

Section: Age Of Metamorphismmentioning

confidence: 93%

“…Previous c. 1830-1815 Ma U-Pb ages were obtained from monazites (Mouri et al, 2005). These monazite ages coincide with the 1824 ± 5 Ma monazite age of metamorphism from Kemiö, 50 km west of Orijärvi (Levin et al, 2005).…”

Section: Regional Implicationsmentioning

confidence: 99%

“…In southwestern Finland there is zircon data on 1.85 Ga and 1.83 Ga metamorphism (Torvela et al, 2008), 1824 ± 5 Ma and 1804 ± 14 Ma leucosomes and c. 1830 Ma and younger monazite data from granites (Suominen, 1991;Nironen, 1999;Ehlers et al, 2004). From the West Uusimaa area there are from c. 1.85 Ga to 1813 ± 4 Ma granites (Kurhila et al, 2005;Skyttä & Mänttäri, 2008) and from 1832 ± 2 Ma to 1792 ± 5 Ma metamorphic ages (Mouri et al, 2005 and this study). From southeastern Finland ages on metamorphism and crustally derived granites ranges from c. 1840 Ma to 1795 Ma (Korsman et al 1984;Nykänen, 1988;Vaasjoki & Sakko, 1988).…”

Section: Regional Implicationsmentioning

confidence: 99%

“…This is compatible with previous investigations on late Svecofennian metamorphism. 20 km to the east of the present location, within the West Uusimaa granulite area, Mouri et al (2005) dated monazites from high-grade gneisses by U-Pb TIMS. The leucosome monazites yielded concordant ages of 1819 ± 2 Ma, 1818 ± 2 Ma and 1816 ± 2 Ma, while the mesosome monazites yielded an age of 1832 ± 2 Ma.…”

Section: Age Of Metamorphismmentioning

confidence: 99%

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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

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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.

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Section: Regional Implicationsmentioning

confidence: 56%

Section: Age Of Metamorphismmentioning

confidence: 93%

Section: Regional Implicationsmentioning

confidence: 99%

Section: Regional Implicationsmentioning

confidence: 99%

Section: Age Of Metamorphismmentioning

confidence: 99%

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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

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The mode of deformation in the orogenic mid‐crust revealed by seismic attribute analysis

Torvela

Moreau

Butler

et al. 2013

Geochem Geophys Geosyst

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[1] The processes and the structures within the middle and the lower crust are intimately related to the evolution of orogenies, but more detailed knowledge is needed of these deep crustal processes. Seismic reflection data, chiefly displayed in amplitude, are commonly used to interpret deep crustal structures. The strongest amplitude events are probably related to lithological changes and do not necessarily correspond to geological structures, tectonic boundaries, or deformation fabrics. Furthermore, the detailed structures and the strain distribution between the interpreted structural boundaries remain obscure. Here, we show an example of how seismic attributes, combined with the seismic facies interpretation technique, can be used to enhance 2D seismic reflection data from the Palaeoproterozoic Svecofennian crust of southern Finland, to reveal unprecedentedly detailed information about the deformation fabrics within the mid-crust of a collisional orogen. The images are plausibly interpreted to show that the extension/lateral flow of the orogenic middle and lower crust was mainly accommodated by kilometer-scale S-C 0 structures. The structures form penetrative deformation fabrics which are correlated with outcrop observations. The successful enhancement of the seismic data confirms the ductile extension affecting hot orogenic crust, and gives new information about the strain distribution of the regional, syn-to late-orogenic deformation. The seismic attribute method and the seismic facies interpretational approach described in this paper should be applicable to other seismic datasets from the crystalline basement.

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Timing of magmatism and migmatization in the 2.0–1.8 Ga accretionary Svecokarelian orogen, south-central Sweden

Johansson

Stephens

2016

Int J Earth Sci (Geol Rundsch)

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Sm-Nd garnet and U-Pb monazite dating of high-grade metamorphism and crustal melting in the West Uusimaa area, southern Finland

Cited by 36 publications

References 29 publications

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

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

The mode of deformation in the orogenic mid‐crust revealed by seismic attribute analysis

Timing of magmatism and migmatization in the 2.0–1.8 Ga accretionary Svecokarelian orogen, south-central Sweden

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