Jurassic age of metamorphism at the base of the Brezovica peridotite (Yugoslavia)

Details Jurassic age of metamorphism at the base of the Brezovica peridotite (Yugoslavia) Jurassic age of metamorphism at the base of the Brezovica peridotite (Yugoslavia)

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..39..291o&link_type=abstract

Earth and Planetary Science Letters, Volume 39, Issue 2, p. 291-297.

Physics

4

Scientific paper

Minerals from two amphibolites and two micaschists from the metamorphic sequence at the base of the Brezovica peridotite were dated by the K-Ar method. Two muscovites and one hornblende gave concordant ages of 161.5 +/- 1.6 (2σ), 162.8 +/- 1.9, and 162.6 +/- 3.4 m.y. respectively while one hornblende gave a slightly discordant date of 169.0 +/- 3.2 m.y. The dates indicate cooling of the sequence during Middle to Upper Jurassic times. If one interprets the Brezovica sequence as a dynamo-thermal aureole, the cooling age is indistinguishable from the time of emplacement of the hot peridotite.

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