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Monazite in the ecl...
Monazite in the eclogite and blueschist of the Svalbard Caledonides : its origin and forming-reactions
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- Kosminska, Karolina (author)
- AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland.
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- Fassmer, Kathrin (author)
- Univ Innsbruck, Inst Geol, Innsbruck, Austria.
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- McClelland, William C. (author)
- Univ Iowa, Dept Earth & Environm Sci, Iowa City, IA USA.
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- Majka, Jaroslaw (author)
- Uppsala universitet,Mineralogi, petrologi och tektonik,AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland.
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- Coble, Matthew (author)
- GNS Sci, Surface Geosci Dept, Lower Hutt, New Zealand.
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- Thomas, Jay (author)
- Syracuse Univ, Dept Earth & Environm Sci, Syracuse, NY USA.
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- Manecki, Maciej (author)
- AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland.
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- Lorenz, Henning, Dr. 1972- (author)
- Uppsala universitet,Geofysik
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- Bazarnik, Jakub (author)
- Polish Geol Inst, Natl Res Inst, Carpathian Branch, Krakow, Poland.
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- Münker, Carsten (author)
- Univ Cologne, Inst Geol & Mineral, Cologne, Germany.
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AGH Univ Sci & Technol, Fac Geol Geophys & Environm Protect, Krakow, Poland Univ Innsbruck, Inst Geol, Innsbruck, Austria. (creator_code:org_t)
- Springer, 2023
- 2023
- English.
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In: Contributions to Mineralogy and Petrology. - : Springer. - 0010-7999 .- 1432-0967. ; 178
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Abstract
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- High-pressure low-temperature rocks from Svalbard are an excellent target for studying metamorphic reactions in Phanerozoic subduction zones. This study reveals the presence of monazite in an eclogite and a blueschist from the Vestgotabreen Complex, southwestern Svalbard. In order to investigate the monazite-forming reaction, we obtained pressure-temperature estimates coupled with U-Pb and Lu-Hf dating. Combined geothermobarometry allows to constrain three evolutionary stages of garnet growth in the eclogite: nucleation (1.6 & PLUSMN; 0.3 GPa at 460 & PLUSMN; 60 & DEG;C), peak-pressure (2.3 & PLUSMN; 0.3 GPa at 507 & PLUSMN; 60 & DEG;C), and peak-temperature (2.1 & PLUSMN; 0.3 GPa at 553 & PLUSMN; 60 & DEG;C). A zircon age of 482 & PLUSMN; 10 Ma is interpreted to belong to the prograde part of the pressure-temperature path. Monazite forms inclusions within garnet rims, or it is surrounded by allanite and apatite, altogether forming pseudomorphs of a tabular shape in the matrix. Textures, geothermobarometry and geochronology support the conclusion the monazite formed under high-pressure conditions at 471 & PLUSMN; 6 Ma. We propose that the monazite crystallization in the eclogite happened due to a decomposition of accessory phases during the decompression after peak-pressure of the metamorphic cycle. Monazite in the blueschist occurs as inclusions in garnet cores and gives an indicative age of 486 & PLUSMN; 6 Ma, which is interpreted to reflect the prograde growth of the garnet. Lu-Hf garnet dating resolves an age of peak-pressure metamorphism in the blueschist at 471.1 & PLUSMN; 4 Ma under conditions of 2.0 & PLUSMN; 0.03 GPa and 500 & PLUSMN; 30 & DEG;C. The Vestgotabreen Complex provides evidence for an early Ordovician modern-style subduction system in the proximity of the Baltica margin. Hence, this study also supports the tectonic models that favour a mixed Baltican and Laurentian provenance of south-western Svalbard.
Subject headings
- 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)
Keyword
- Eclogite
- Blueschist
- Monazite
- High-pressure low-temperature metamorphism
- Vestgotabreen Complex
- Svalbard
Publication and Content Type
- ref (subject category)
- art (subject category)
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Kosminska, Karol ...
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Fassmer, Kathrin
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McClelland, Will ...
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Majka, Jaroslaw
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Coble, Matthew
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Thomas, Jay
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Manecki, Maciej
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Lorenz, Henning, ...
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Bazarnik, Jakub
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Münker, Carsten
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geology
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Geochemistry
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Uppsala University