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Integrating X-ray mapping and microtomography of garnet with thermobarometry to define the P-T evolution of the (near) UHP Miedzygorze eclogite, Sudetes, SW Poland
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland.ORCID iD: 0000-0002-6792-6866
Polish Acad Sci, Inst Geol Sci, Krakow, Poland.
AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.ORCID iD: 0000-0001-7346-1770
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2019 (English)In: Journal of Metamorphic Geology, ISSN 0263-4929, E-ISSN 1525-1314, Vol. 37, no 1, p. 97-112Article in journal (Refereed) Published
Abstract [en]

Detailed X-ray compositional mapping and microtomography have revealed the complex zoning and growth history of garnet in a kyanite-bearing eclogite. The garnet occurs as clusters of coalesced grains with cores revealing slightly higher Ca and lower Mg than the rims forming the coalescence zones between the grains. Core regions of the garnet host inclusions of omphacite with the highest jadeite, and phengite with the highest Si, similar to values in the cores of omphacite and phengite located in the matrix. Therefore, the core compositions of garnet, omphacite, and phengite have been chosen for the peak pressure estimate. Coupled conventional thermobarometry, average P-T, and phase equilibrium modelling in the NCKFMMnASHT system yields P-T conditions of 26-30 kbar at 800-930 degrees C. Although coesite is not preserved, these P-T conditions partially overlap the coesite stability field, suggesting near ultra-high-pressure (UHP) conditions during the formation of this eclogite. Therefore, the peak pressure assemblage is suggested to have been garnet-omphacite-kyanite-phengite-coesite/quartz-rutile. Additional lines of evidence for the possible UHP origin of the Miedzygorze eclogite are the presence of rod-shaped inclusions of quartz parallel to the c-axis in omphacite as well as relatively high values of Ca-Tschermak and Ca-Eskola components. Late zoisite, rare diopside-plagioclase symplectites rimming omphacite, and minor phlogopite-plagioclase symplectites replacing phengite formed during retrogression together with later amphibole. These retrograde assemblages lack minerals typical of granulite facies, which suggests simultaneous decompression and cooling during exhumation before the crustal-scale folding that was responsible for final exhumation of the eclogite.

Place, publisher, year, edition, pages
2019. Vol. 37, no 1, p. 97-112
National Category
Geochemistry
Identifiers
URN: urn:nbn:se:uu:diva-374439DOI: 10.1111/jmg.12450ISI: 000454953000005OAI: oai:DiVA.org:uu-374439DiVA, id: diva2:1282522
Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved

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Majka, JaroslawKlonowska, Iwona

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