Mesoarchean melt and fluid inclusions in garnet from the Kangerlussuaq basement, Southeast Greenland

• Autorzy: Nicoli Gautier , Gresky Kerstin , Ferrero Silvio

Identyfikatory

DOI

10.2478/mipo-2022-0001

• Języki publikacji: EN

Abstrakty

EN

The present work reports the first anatectic melt inclusions found so far in the Mesoarchean basement in East Greenland. Using optical microscope observations and MicroRaman spectroscopy, we show that garnets in metasedimentary migmatite contain primary polycrystalline aggregates which can be confidently interpreted as former droplets of anatectic melt, i.e. nanogranitoids. In some cases, they coexist with coeval fluid inclusions under conditions of primary fluid-melt immiscibility. The re-evaluation of the metamorphic pressure and temperature conditions with up-to-date phase equilibria modelling, combined with the identification of nanogranitoids and fluid inclusions, suggests metamorphic peak equilibration and partial melting in presence of a COH-fluid at T ~1000°C and P > 7 kbar. To date, this is the oldest verified occurrence of nanogranitoids and fluid-melt immiscibility during garnet growth in a partially molten environment.

Słowa kluczowe

EN

melt inclusions; Precambrian; Greenland

• Wydawca: Mineralogical Society of Poland
• Czasopismo: Mineralogia
• Rocznik: 2022
• Tom: Vol. 53, iss. 1
• Strony: 1--9
• Opis fizyczny: Bibliogr. 31 poz., rys., tab., wykr.

Twórcy

autor

Nicoli Gautier

• Universität Potsdam, Institut für Geowissenschaften, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany

autor

Gresky Kerstin

• Universität Potsdam, Institut für Geowissenschaften, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm, Germany

autor

Ferrero Silvio

• Università degli Studi di Cagliari, Cittadella Universitaria di Monserrato S.S. 554 Bivio Sestu, 09042 Monserrato, Italy

Bibliografia

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