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Halogen-bearing met...
Halogen-bearing metasomatizing melt preserved in high-pressure (HP) eclogites of Pfaffenberg, Bohemian Massif
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- Borghini, Alessia (författare)
- AGH Univ Krakow, Fac Geol Geophys & Environm Protect, PL-30059 Krakow, Poland.;Univ Potsdam, Inst Geosci, D-14476 Potsdam, Germany.
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- Ferrero, Silvio (författare)
- Univ Cagliari, Dipartimento Sci Chim & Geolog, I-09042 Monserrato, Italy.;Leibniz Inst Evolut & Biodiversitatsforsch, Museum Naturkunde MfN, D-10115 Berlin, Germany.
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- O'Brien, Patrick J. (författare)
- Univ Potsdam, Inst Geosci, D-14476 Potsdam, Germany.
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- Wunder, Bernd (författare)
- Deutsch GeoForsch Zentrum GFZ, D-14473 Potsdam, Germany.
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- Tollan, Peter (författare)
- Swiss Fed Inst Technol, CH-8092 Zurich, Switzerland.
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- Majka, Jaroslaw (författare)
- Uppsala universitet,Institutionen för geovetenskaper,AGH Univ Krakow, Fac Geol Geophys & Environm Protect, PL-30059 Krakow, Poland.
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- Fuchs, Rico (författare)
- Univ Potsdam, Inst Geosci, D-14476 Potsdam, Germany.
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- Gresky, Kerstin (författare)
- Univ Potsdam, Inst Geosci, D-14476 Potsdam, Germany.
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AGH Univ Krakow, Fac Geol Geophys & Environm Protect, PL-30059 Krakow, Poland;Univ Potsdam, Inst Geosci, D-14476 Potsdam, Germany. Univ Cagliari, Dipartimento Sci Chim & Geolog, I-09042 Monserrato, Italy.;Leibniz Inst Evolut & Biodiversitatsforsch, Museum Naturkunde MfN, D-10115 Berlin, Germany. (creator_code:org_t)
- Copernicus Publications, 2024
- 2024
- Engelska.
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Ingår i: European journal of mineralogy. - : Copernicus Publications. - 0935-1221 .- 1617-4011. ; 36:2, s. 279-300
- Relaterad länk:
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.5...
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Abstract
Ämnesord
Stäng
- Primary granitic melt inclusions are trapped in garnets of eclogites in the garnet peridotite body of Pfaffenberg, Granulitgebirge (Bohemian Massif, Germany). These polycrystalline inclusions, based on their nature and composition, can be called nanogranitoids and contain mainly phlogopite/biotite, kumdykolite, quartz/rare cristobalite, a phase with the main Raman peak at 412 cm - 1 , a phase with the main Raman peak at 430 cm - 1 , osumilite and plagioclase. The melt is hydrous, peraluminous and granitic and significantly enriched in large ion lithophile elements (LILE), Th, U, Li, B and Pb. The melt major element composition resembles that of melts produced by the partial melting of metasediments, as also supported by its trace element signature characterized by elements (LILE, Pb, Li and B) typical of the continental crust. These microstructural and geochemical features suggest that the investigated melt originated in the subducted continental crust and interacted with the mantle to produce the Pfaffenberg eclogite. Moreover, in situ analyses and calculations based on partition coefficients between apatite and melt show that the melt was also enriched in Cl and F, pointing toward the presence of a brine during melting.The melt preserved in inclusions can thus be regarded as an example of a metasomatizing agent present at depth and responsible for the interaction between the crust and the mantle. Chemical similarities between this melt and other metasomatizing melts measured in other eclogites from the Granulitgebirge and Erzgebirge, in addition to the overall similar enrichment in trace elements observed in other metasomatized mantle rocks from central Europe, suggest an extended crustal contamination of the mantle beneath the Bohemian Massif during the Variscan orogeny.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
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- art (ämneskategori)
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