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

Hassina Mouri; Markku Väisänen; Hannu Huhma

doi:10.1080/11035890501272123

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

Hassina Mouri, Markku Väisänen, Hannu Huhma

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

The 100 km wide late Svecofennian granite-migmatite zone in southern Finland contains the Sulkava, the Turku and the West Uusimaa low-pressure, high-temperature granulite areas. In the West Uusimaa area the peak metamorphic conditions are estimated at T = 750-800°C and P = 4-5 kbars. Detailed isotopic dating of different parts of migmatites (mesosomes and leucosomes) as well garnetorthopyroxene gneisses was undertaken by conventional analysis of U-Pb on monazite and Sm-Nd on garnet. U-Pb monazite ages show that the West Uusimaa area underwent a granulite facies metamorphism at peak conditions between 1832±2 Ma and 1816±2 Ma. The area was then cooled down to 700-600°C at 1.81-1.79 Ga according to Sm-Nd garnet-whole rock data. These results together with previous data show that all the three granulite areas in southern Finland share a coeval thermal event probably stemming from common or similar heat sources.

Original language	English
Pages (from-to)	123-128
Number of pages	6
Journal	GFF
Volume	127
Issue number	2
DOIs	https://doi.org/10.1080/11035890501272123
Publication status	Published - 2005
Externally published	Yes

Keywords

Granulite
Migmatite
Palaeoproterozoic
Svecofennian

ASJC Scopus subject areas

Geology
Paleontology

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10.1080/11035890501272123

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title = "Sm-Nd garnet and U-Pb monazite dating of high-grade metamorphism and crustal melting in the west uusimaa area, southern Finland",

abstract = "The 100 km wide late Svecofennian granite-migmatite zone in southern Finland contains the Sulkava, the Turku and the West Uusimaa low-pressure, high-temperature granulite areas. In the West Uusimaa area the peak metamorphic conditions are estimated at T = 750-800°C and P = 4-5 kbars. Detailed isotopic dating of different parts of migmatites (mesosomes and leucosomes) as well garnetorthopyroxene gneisses was undertaken by conventional analysis of U-Pb on monazite and Sm-Nd on garnet. U-Pb monazite ages show that the West Uusimaa area underwent a granulite facies metamorphism at peak conditions between 1832±2 Ma and 1816±2 Ma. The area was then cooled down to 700-600°C at 1.81-1.79 Ga according to Sm-Nd garnet-whole rock data. These results together with previous data show that all the three granulite areas in southern Finland share a coeval thermal event probably stemming from common or similar heat sources.",

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author = "Hassina Mouri and Markku V{\"a}is{\"a}nen and Hannu Huhma",

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AU - Väisänen, Markku

AU - Huhma, Hannu

PY - 2005

Y1 - 2005

N2 - The 100 km wide late Svecofennian granite-migmatite zone in southern Finland contains the Sulkava, the Turku and the West Uusimaa low-pressure, high-temperature granulite areas. In the West Uusimaa area the peak metamorphic conditions are estimated at T = 750-800°C and P = 4-5 kbars. Detailed isotopic dating of different parts of migmatites (mesosomes and leucosomes) as well garnetorthopyroxene gneisses was undertaken by conventional analysis of U-Pb on monazite and Sm-Nd on garnet. U-Pb monazite ages show that the West Uusimaa area underwent a granulite facies metamorphism at peak conditions between 1832±2 Ma and 1816±2 Ma. The area was then cooled down to 700-600°C at 1.81-1.79 Ga according to Sm-Nd garnet-whole rock data. These results together with previous data show that all the three granulite areas in southern Finland share a coeval thermal event probably stemming from common or similar heat sources.

AB - The 100 km wide late Svecofennian granite-migmatite zone in southern Finland contains the Sulkava, the Turku and the West Uusimaa low-pressure, high-temperature granulite areas. In the West Uusimaa area the peak metamorphic conditions are estimated at T = 750-800°C and P = 4-5 kbars. Detailed isotopic dating of different parts of migmatites (mesosomes and leucosomes) as well garnetorthopyroxene gneisses was undertaken by conventional analysis of U-Pb on monazite and Sm-Nd on garnet. U-Pb monazite ages show that the West Uusimaa area underwent a granulite facies metamorphism at peak conditions between 1832±2 Ma and 1816±2 Ma. The area was then cooled down to 700-600°C at 1.81-1.79 Ga according to Sm-Nd garnet-whole rock data. These results together with previous data show that all the three granulite areas in southern Finland share a coeval thermal event probably stemming from common or similar heat sources.

KW - Granulite

KW - Migmatite

KW - Palaeoproterozoic

KW - Svecofennian

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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

Abstract

Keywords

ASJC Scopus subject areas

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