Metamorphism of the glaucophane - and magnesioriebeckite - bearing metamorphic rocks in the Gostivar - Vodno Zone, North - Western Macedonia

Mircovski, Vojo and Spasovski, Orce (2009) Metamorphism of the glaucophane - and magnesioriebeckite - bearing metamorphic rocks in the Gostivar - Vodno Zone, North - Western Macedonia. In: Comptes rendus - De l' Academie Bulgarie des Sciences. Bulgarian Academy of Science, Sofia, Bulgaria, pp. 69-85.

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Abstract

Mineral assemblages discovered in the glaucophane - and magnesioriebeckite - bearing metamorphic rocks of Gostivar - Vodno zone, allow to distinguish three metamorphic phases. The first - phase metamorphism is progressive and corresponds to conditions of the lowest temperature part of the greenschist facis at P from 2 to 4 bar and T of about 350 C. The second metamorphic phase formed the sodic amphiboles glaucophane and magnesioriebeckite in a paragenesis with phengite and epidote - minerals that are indicatoris of epidoteblueschist facies. To determine the P - T conditions of metamorphism in the phase, the chemical composition of sodic amphiboles and phengite were used with application of several geothermobarometers that yielded P from 6 to 9 which Kbar and T of about 400+- 20 C. The thirs phase is a retrograde one in witch glaucophane grade into actinolite, chlorite and albite mineral parageneses characteristic of the lowest temperature part of the greenschsist facies. Phengites from two samples of glaucophane and magnesioriebeckite bearing metamorphic rocks were dated by the K/Ar method. They yielded an age of 137 +- 8 to 153+-9 Ma interpreted as the age of high - pressure metamorphism that corresponds to the Late Jurassic.

Item Type:	Book Section
Uncontrolled Keywords:	metamorphism, sodic amphiboles, glaucophane, epidote blueschists facies, Vodno, Gostivar
Subjects:	Engineering and Technology > Other engineering and technologies Natural sciences > Other natural sciences
Divisions:	Faculty of Natural and Technical Sciences
Depositing User:	Vojo Mircovski
Date Deposited:	28 Nov 2012 13:55
Last Modified:	11 Jun 2013 07:45
URI:	https://eprints.ugd.edu.mk/id/eprint/2362

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