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• W2000260512 endingPage "538" @default.
• W2000260512 startingPage "526" @default.
• W2000260512 abstract "Eclogites and associated high-pressure (HP) rocks in collisional and accretionary orogenic belts preserve a record of subduction and exhumation, and provide a key constraint on the tectonic evolution of the continents. Most eclogites that formed at high pressures but low temperatures at > 10-11 kbar and 450-650 degrees C can be interpreted as a result of subduction of cold oceanic lithosphere. A new class of high-temperature (HT) eclogites that formed above 900 degrees C and at 14 to 30 kbar occurs in the deep continental crust, but their geodynamic significance and processes of formation are poorly understood. Here we show that Neoarchaean mafic-ultramafic complexes in the central granulite facies region of the Lewisian in NW Scotland contain HP/HT garnet-bearing granulites (retrogressed eclogites), gabbros, Iherzolites, and websterites, and that the HP granulites have garnets that contain inclusions of omphacite. From thermodynamic modeling and compositional isopleths we calculate that peak eclogite-facies metamorphism took place at 24-22 kbar and 1060-1040 degrees C. The geochemical signature of one (G-21) of the samples shows a strong depletion of Eu indicating magma fractionation at a crustal level. The Sm-Nd isochron ages of HP phases record different cooling ages of ca. 2480 and 2330 Ma. We suggest that the layered mafic-ultramafic complexes, which may have formed in an oceanic environment, were subducted to eclogite depths, and exhumed as HP garnet-bearing orogenic peridotites. The layered complexes were engulfed by widespread orthogneisses of tonalite-trondhjemite-granodiorite (TTG) composition with granulite facies assemblages. We propose two possible tectonic models: (1) the fact that the relicts of eclogitic complexes are so widespread in the Scourian can be taken as evidence that a >90 km x 40 km-size slab of continental crust containing mafic-ultramafic complexes was subducted to at least 70 km depth in the late Archaean. During exhumation the gneiss protoliths were retrogressed to granulite facies assemblages, but the mafic-ultramafic rocks resisted retrogression. (2) The layered complexes of mafic and ultramafic rocks were subducted to eclogite-facies depths and during exhumation under crustal conditions they were intruded by the orthogneiss protoliths (TTG) that were metamorphosed in the granulite facies. Apart from poorly defined UHP metamorphic rocks in Norway, the retrogressed eclogites in the central granulite/retrogressed eclogite facies Lewisian region, NW Scotland have the highest crustal pressures so far reported for Archaean rocks, and demonstrate that lithospheric subduction was transporting crustal rocks to HP depths in the Neoarchaean. (C) 2012 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved." @default.
• W2000260512 created "2016-06-24" @default.
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• W2000260512 date "2013-03-01" @default.
• W2000260512 modified "2023-10-02" @default.
• W2000260512 title "High-temperature, high-pressure granulites (retrogressed eclogites) in the central region of the Lewisian, NW Scotland: Crustal-scale subduction in the Neoarchaean" @default.
• W2000260512 cites W1526594253 @default.
• W2000260512 cites W1605368522 @default.
• W2000260512 cites W1629623139 @default.
• W2000260512 cites W1767843502 @default.
• W2000260512 cites W1830358639 @default.
• W2000260512 cites W1927990280 @default.
• W2000260512 cites W1967494718 @default.
• W2000260512 cites W1968032847 @default.
• W2000260512 cites W1968370578 @default.
• W2000260512 cites W1968800718 @default.
• W2000260512 cites W1969859799 @default.
• W2000260512 cites W1972838909 @default.
• W2000260512 cites W1976654666 @default.
• W2000260512 cites W1977246079 @default.
• W2000260512 cites W1977584800 @default.
• W2000260512 cites W1978949282 @default.
• W2000260512 cites W1979306711 @default.
• W2000260512 cites W1983344886 @default.
• W2000260512 cites W1983922737 @default.
• W2000260512 cites W1985297387 @default.
• W2000260512 cites W1985925759 @default.
• W2000260512 cites W1990091620 @default.
• W2000260512 cites W2005030647 @default.
• W2000260512 cites W2005264158 @default.
• W2000260512 cites W2006203639 @default.
• W2000260512 cites W2007654325 @default.
• W2000260512 cites W2007800343 @default.
• W2000260512 cites W2008045929 @default.
• W2000260512 cites W2008063801 @default.
• W2000260512 cites W2009751763 @default.
• W2000260512 cites W2010099789 @default.
• W2000260512 cites W2011987758 @default.
• W2000260512 cites W2015645995 @default.
• W2000260512 cites W2020179468 @default.
• W2000260512 cites W2021524574 @default.
• W2000260512 cites W2025028066 @default.
• W2000260512 cites W2026888714 @default.
• W2000260512 cites W2029710642 @default.
• W2000260512 cites W2031248132 @default.
• W2000260512 cites W2033905528 @default.
• W2000260512 cites W2037672462 @default.
• W2000260512 cites W2038325228 @default.
• W2000260512 cites W2041194228 @default.
• W2000260512 cites W2042232585 @default.
• W2000260512 cites W2043819754 @default.
• W2000260512 cites W2045957186 @default.
• W2000260512 cites W2046985684 @default.
• W2000260512 cites W2051208930 @default.
• W2000260512 cites W2051318106 @default.
• W2000260512 cites W2052188270 @default.
• W2000260512 cites W2053038267 @default.
• W2000260512 cites W2054133063 @default.
• W2000260512 cites W2054247338 @default.
• W2000260512 cites W2054620347 @default.
• W2000260512 cites W2056549444 @default.
• W2000260512 cites W2057346328 @default.
• W2000260512 cites W2058175402 @default.
• W2000260512 cites W2058765817 @default.
• W2000260512 cites W2061359484 @default.
• W2000260512 cites W2062197435 @default.
• W2000260512 cites W2062707668 @default.
• W2000260512 cites W2066596687 @default.
• W2000260512 cites W2068612025 @default.
• W2000260512 cites W2071510439 @default.
• W2000260512 cites W2075819648 @default.
• W2000260512 cites W2077479198 @default.
• W2000260512 cites W2078892423 @default.
• W2000260512 cites W2079198463 @default.
• W2000260512 cites W2079478482 @default.
• W2000260512 cites W2087107577 @default.
• W2000260512 cites W2089013154 @default.
• W2000260512 cites W2093059940 @default.
• W2000260512 cites W2095084937 @default.
• W2000260512 cites W2095298140 @default.
• W2000260512 cites W2095315893 @default.
• W2000260512 cites W2100516054 @default.
• W2000260512 cites W2103522682 @default.
• W2000260512 cites W2110894585 @default.
• W2000260512 cites W2126728479 @default.
• W2000260512 cites W2134324431 @default.
• W2000260512 cites W2134680675 @default.
• W2000260512 cites W2135614099 @default.
• W2000260512 cites W2136251498 @default.
• W2000260512 cites W2143188177 @default.
• W2000260512 cites W2146803029 @default.
• W2000260512 cites W2147155351 @default.
• W2000260512 cites W2157025815 @default.
• W2000260512 cites W2158616370 @default.
• W2000260512 cites W2159768285 @default.

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