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Anticlockwise metamorphic pressure-temperature paths and nappe stacking in the Reisa Nappe Complex in the Scandinavian Caledonides, northern Norway: evidence for weakening of lower continental crust before and during continental collision

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F19%3A10389076" target="_blank" >RIV/00216208:11310/19:10389076 - isvavai.cz</a>

  • Výsledek na webu

    <a href="https://doi.org/10.5194/se-10-117-2019" target="_blank" >https://doi.org/10.5194/se-10-117-2019</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.5194/se-10-117-2019" target="_blank" >10.5194/se-10-117-2019</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Anticlockwise metamorphic pressure-temperature paths and nappe stacking in the Reisa Nappe Complex in the Scandinavian Caledonides, northern Norway: evidence for weakening of lower continental crust before and during continental collision

  • Popis výsledku v původním jazyce

    This study investigates the tectonostratigraphy and metamorphic and tectonic evolution of the Caledonian Reisa Nappe Complex (RNC; from bottom to top: Vaddas, Kafjord, and Nordmannvik nappes) in northern Troms, Norway. Structural data, phase equilibrium modelling, and U-Pb zircon and titanite geochronology are used to constrain the timing and pressure-temperature (P-T) conditions of deformation and metamorphism during nappe stacking that facilitated crustal thickening during continental collision. Five samples taken from different parts of the RNC reveal an anticlockwise P-T path attributed to the effects of early Silurian heating (D-1) followed by thrusting (D-2). At ca. 439 Ma during D-1 the Nordmannvik Nappe reached the highest metamorphic conditions at ca. 780 degrees C and similar to 9-11 kbar inducing kyanite-grade partial melting. At the same time the Kafjord Nappe was at higher, colder, levels of the crust ca. 600 degrees C, 6-7 kbar and the Vaddas Nappe was intruded by gabbro at &gt; 650 degrees C and ca. 6-9 kbar. The subsequent D-2 shearing occurred at increasing pressure and decreasing temperatures ca. 700 degrees C and 9-11 kbar in the partially molten Nordmannvik Nappe, ca. 600 degrees C and 9-10 kbar in the Kafjord Nappe, and ca. 640 degrees C and 12-13 kbar in the Vaddas Nappe. Multistage titanite growth in the Nordmannvik Nappe records this evolution through D-1 and D-2 between ca. 440 and 427 Ma, while titanite growth along the lower RNC boundary records D-2 shearing at 432 +/- 6 Ma. It emerges that early Silurian heating (ca. 440 Ma) probably resulted from large-scale magma underplating and initiated partial melting that weakened the lower crust, which facilitated dismembering of the crust into individual thrust slices (nappe units). This tectonic style contrasts with subduction of mechanically strong continental crust to great depths as seen in, for example, the Western Gneiss Region further south.

  • Název v anglickém jazyce

    Anticlockwise metamorphic pressure-temperature paths and nappe stacking in the Reisa Nappe Complex in the Scandinavian Caledonides, northern Norway: evidence for weakening of lower continental crust before and during continental collision

  • Popis výsledku anglicky

    This study investigates the tectonostratigraphy and metamorphic and tectonic evolution of the Caledonian Reisa Nappe Complex (RNC; from bottom to top: Vaddas, Kafjord, and Nordmannvik nappes) in northern Troms, Norway. Structural data, phase equilibrium modelling, and U-Pb zircon and titanite geochronology are used to constrain the timing and pressure-temperature (P-T) conditions of deformation and metamorphism during nappe stacking that facilitated crustal thickening during continental collision. Five samples taken from different parts of the RNC reveal an anticlockwise P-T path attributed to the effects of early Silurian heating (D-1) followed by thrusting (D-2). At ca. 439 Ma during D-1 the Nordmannvik Nappe reached the highest metamorphic conditions at ca. 780 degrees C and similar to 9-11 kbar inducing kyanite-grade partial melting. At the same time the Kafjord Nappe was at higher, colder, levels of the crust ca. 600 degrees C, 6-7 kbar and the Vaddas Nappe was intruded by gabbro at &gt; 650 degrees C and ca. 6-9 kbar. The subsequent D-2 shearing occurred at increasing pressure and decreasing temperatures ca. 700 degrees C and 9-11 kbar in the partially molten Nordmannvik Nappe, ca. 600 degrees C and 9-10 kbar in the Kafjord Nappe, and ca. 640 degrees C and 12-13 kbar in the Vaddas Nappe. Multistage titanite growth in the Nordmannvik Nappe records this evolution through D-1 and D-2 between ca. 440 and 427 Ma, while titanite growth along the lower RNC boundary records D-2 shearing at 432 +/- 6 Ma. It emerges that early Silurian heating (ca. 440 Ma) probably resulted from large-scale magma underplating and initiated partial melting that weakened the lower crust, which facilitated dismembering of the crust into individual thrust slices (nappe units). This tectonic style contrasts with subduction of mechanically strong continental crust to great depths as seen in, for example, the Western Gneiss Region further south.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    10505 - Geology

Návaznosti výsledku

  • Projekt

  • Návaznosti

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Ostatní

  • Rok uplatnění

    2019

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název periodika

    Solid Earth

  • ISSN

    1869-9510

  • e-ISSN

  • Svazek periodika

    10

  • Číslo periodika v rámci svazku

    1

  • Stát vydavatele periodika

    DE - Spolková republika Německo

  • Počet stran výsledku

    32

  • Strana od-do

    117-148

  • Kód UT WoS článku

    000456062100002

  • EID výsledku v databázi Scopus

    2-s2.0-85060116039