Готові списки джерел за темами / Blueschist facies metapelite

Добірка наукової літератури з теми "Blueschist facies metapelite"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Blueschist facies metapelite"

1

Gonzalez, Joseph P., Suzanne L. Baldwin, Jay B. Thomas, William O. Nachlas, and Paul G. Fitzgerald. "Evidence for ultrahigh-pressure metamorphism discovered in the Appalachian orogen." Geology 48, no. 10 (June 19, 2020): 947–51. http://dx.doi.org/10.1130/g47507.1.

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Abstract The Appalachian orogen has long been enigmatic because, compared to other parts of the Paleozoic orogens that formed following the subduction of the Iapetus Ocean, direct evidence for ultrahigh-pressure (UHP) metamorphism has never been found. We report the first discovery of coesite in the Appalachian orogen in a metapelite from the mid-Ordovician (Taconic orogeny) Tillotson Peak Complex in Vermont (USA). Relict coesite occurs within a bimineralic SiO2 inclusion in garnet. In situ elastic barometry and trace-element thermometry allow reconstruction of the garnet growth history during prograde metamorphism. The data are interpreted to indicate garnet nucleation and crystallization during blueschist- to eclogite-facies subduction zone metamorphism, followed by garnet rim growth at UHP conditions of > 28 kbar and > 530 ° C. Results provide the first direct evidence that rocks of the Appalachian orogen underwent UHP metamorphism to depths of > 75 km and warrant future studies that constrain the extent of UHP metamorphism.
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2

MPOSKOS, E., and M. PERRAKI. "High pressure alpine metamorphism of the Pelagonian allochthon in the Kastania area (Southern Vermion), Greece." Bulletin of the Geological Society of Greece 34, no. 3 (January 1, 2001): 939. http://dx.doi.org/10.12681/bgsg.17124.

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The Pelagonian allochthon in the Kastania area (Southern Vermion) consists of pre-alpine and alpine rocks that underwent two episodes of Alpine HP/LT metamorphism. The first episode, of Lower Cretaceous age, is represented by the mineral assemblages: Quartz-albite-microcline-phengite±garnet-clinozoisite± biotite±rutiletitanite in orthogneisses and the Kastania metagranite and garnet-chloritoid-chlorite±kyanite-white K-micaparagonite- rutile in high alumina metapelites. Pressures, were estimated at TO kbar at 500 °C, applying the phengite geobarometry and more than 22 Kbar, calculating the reaction Grt+Rt+Qtz+W®Ttn-l-Czo, occurred in the Kastania metagranite during decompression. Recrystallization at albite-epidote-amphibolite facies conditions accompanied by penetrative deformation defines the dominant mineral assemblages and textures in orthogneisses, metapelites and metabasites. The second metamorphic episode of a probable Eocene age occurred under blueschist/greenschist facies conditions and produced fine-grained phengite, stilpnomelane, green biotite and blue amphibole in orthogneisses and amphibolites.
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3

Roda, Manuel, Michele Zucali, Alessandro Regorda, and Maria Iole Spalla. "Formation and evolution of a subduction-related mélange: The example of the Rocca Canavese Thrust Sheets (Western Alps)." GSA Bulletin 132, no. 3-4 (September 17, 2019): 884–96. http://dx.doi.org/10.1130/b35213.1.

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Abstract In the Sesia-Lanzo Zone, Western Alps, the Rocca Canavese Thrust Sheets (RCT) subunit is characterized by a mixture of mantle- and crust-derived lithologies, such as metapelites, metagranitoids, metabasics, and serpentinized mantle slices with sizes ranging from meters to hundreds of meters. Structural and metamorphic history suggests that the RCT rocks experienced a complex evolution. In particular, two different peak conditions were obtained for the metabasics, representing different tectono-metamorphic units (TMUs), namely, D1a under eclogite facies conditions and D1b under lawsonite-blueschist-facies conditions. The two TMUs were coupled during the syn-D2 exhumation stage under epidote-blueschist-facies conditions. The different rocks and metamorphic evolutions and the abundance of serpentinites in the tectonic mixture suggest a possible subduction-related mélange origin for the RCT. To verify whether a subduction-related mélange can record tectono-metamorphic histories similar to that inferred for the RCT, we compare the pressure-temperature evolutions with the results of a 2-D numerical model of ocean-continent subduction with mantle wedge serpentinization. The predictions of the numerical model fully reproduce the two peak conditions (D1a and D1b) and the successive exhumation history of the two TMUs within the subduction wedge. The degree of mixing estimated from field data is consistent with that predicted by the numerical simulation. Finally, the present-day location of the RCT, which marks the boundary between the orogenic wedge (Penninic and Austroalpine domains) and the southern hinterland (Southalpine domain) of the Alpine chain, is reproduced by the model at the end of the exhumation in the subduction wedge. Therefore, the comparison between natural data and the model results confirms the interpretation of the RCT as a subduction-related mélange that occurred during exhumation within a serpentinized mantle wedge.
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4

ŽÁČKOVÁ, E., J. KONOPÁSEK, P. JEŘÁBEK, F. FINGER, and J. KOŠLER. "Early Carboniferous blueschist facies metamorphism in metapelites of the West Sudetes (Northern Saxothuringian Domain, Bohemian Massif)." Journal of Metamorphic Geology 28, no. 4 (May 2010): 361–79. http://dx.doi.org/10.1111/j.1525-1314.2010.00869.x.

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5

BOSSE, V. "Ductile Thrusting Recorded by the Garnet Isograd from Blueschist-Facies Metapelites of the Ile de Groix, Armorican Massif, France." Journal of Petrology 43, no. 3 (March 1, 2002): 485–510. http://dx.doi.org/10.1093/petrology/43.3.485.

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6

LÓPEZ-CARMONA, A., P. PITRA, and J. ABATI. "Blueschist-facies metapelites from the Malpica- Tui Unit (NW Iberian Massif): phase equilibria modelling and H2 O and Fe2 O3 influence in high-pressure assemblages." Journal of Metamorphic Geology 31, no. 3 (December 1, 2012): 263–80. http://dx.doi.org/10.1111/jmg.12018.

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7

Arenas, R., I. Novo-Fernández, A. Garcia-Casco, R. Díez Fernández, J. M. Fuenlabrada, M. F. Pereira, J. Abati, S. Sánchez Martínez, and F. J. Rubio Pascual. "A unique blueschist facies metapelite with Mg-rich chloritoid from the Badajoz-Córdoba Unit (SW Iberian Massif): correlation of Late Devonian high-pressure belts along the Variscan Orogen." International Geology Review, July 20, 2020, 1–24. http://dx.doi.org/10.1080/00206814.2020.1789509.

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Дисертації з теми "Blueschist facies metapelite"

1

Collins, L. J. "Low-temperature mica schists of Anglesey, UK: cold subduction on the margin of Avalonia." Thesis, 2017. http://hdl.handle.net/2440/126658.

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This item is only available electronically.
Anglesey in North Wales is considered to contain the oldest exposures of lawsonite-glaucophane blueschist in the world, marking the first appearance of lawsonite in the geological record, and heralding the emergence of truly modern subduction thermal regimes. The blueschists formed in the late Neoproterozoic during subduction beneath Avalonia. Interlayered within the blueschist unit are rare lenses of garnet-bearing metapelite that form part of a lithological association with more voluminous garnet-free metapelites. Detrital U-Pb zircon geochronology of the metapelites indicates that deposition of the protolith occurred ~630-590 Ma ago. The dominant detrital zircon ages correspond to the age of arc magmatism along the inferred margin of Avalonia, suggesting that the bulk of the detritus was derived from erosion of the arc. The presence of less abundant older zircons that range in age up to 2Ga, suggest that the arc was built on an ancient continental margin. This suggestion is supported by Nd isotopic compositions of the metapelites, which indicate derivation from an evolved source. The rare garnet metapelites contain the metamorphic assemblage garnet-muscovite-chlorite-albite-quartz-titanite-rutile-pyrite in which coronas of rutile surround titanite. Phase equilibria forward modelling of the metapelites indicates a prograde burial path that culminated with conditions around 400-450°C, at pressures of 10-12kbar. These conditions give an average thermal gradient of around 40°C/kbar, which is comparatively warm for lawsonite-bearing rocks. This suggests the Anglesey lawsonite-bearing blueschists record the onset of global subduction thermal regimes in the late Neoproterozoic that can stabilise lawsonite, rather than simply being a fortuitous preservation of widely developed refrigerated metamorphic rock systems.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2017
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