Mesoarchean melt and fluid inclusions in garnet from the Kangerlussuaq basement, Southeast Greenland-Reference-Cited by-同舟云学术

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

Published:2022-01-01 Issue:1 Volume:53 Page:1-9
ISSN:1899-8526
Container-title:Mineralogia
language:en
Short-container-title:

Author:

Nicoli Gautier¹^ORCID,Gresky Kerstin¹,Ferrero Silvio²^ORCID

Affiliation:

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

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

Abstract

Abstract 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.

Publisher

Walter de Gruyter GmbH

Subject

Geochemistry and Petrology

Link

https://www.sciendo.com/pdf/10.2478/mipo-2022-0001

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