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 journalArticlepeer-review

41 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 languageEnglish
Pages (from-to)123-128
Number of pages6
JournalGFF
Volume127
Issue number2
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • Granulite
  • Migmatite
  • Palaeoproterozoic
  • Svecofennian

ASJC Scopus subject areas

  • Geology
  • Paleontology

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