The Canadian Mineralogist Vol Möller, C., 1998: Decompressed eclogites in the Sveconorwegian (-Grenvillian) Orogen of SW Sweden; petrology and tectonic

The progressive convergence led to the formation of the eclogite facies assemblages at the retrogressed eclogites indicate protoliths that correspond to.

The peak metamorphic condition was estimated as P > 15 kb (probably up to 20 kb) for a minimum temperature of 580°C ( Groppo et al., 2007 ). Eclogite ( / ˈɛklədʒaɪt /) is a metamorphic rock formed when mafic igneous rock is subjected to high pressure. Eclogite forms at pressures greater than those typical of the crust of the Earth. An unusually dense rock, eclogite can play an important role in driving convection within the solid Earth. Variation diagrams enable us identify the crystallization sequence of the plutonic protolith, itself a function of the original tectonic setting.

Eclogite protolith

The SHRIMP U–Pb zircon dating of the metamorphic rims of the Gubaoquan eclogite yields an age 466 ± 27 Ma. and orthopyroxene rich eclogite have not been studied yet. The eclogite in the Flem Gabbro from Flemsøya in the Western Gneiss Region (WGR), Norway, is exceptional due to its peculiar mineral assemblage of olivine and orthopyroxene, which were inherited from an olivine gabbro protolith [8,33]. This eclogite body may once have been situated 2013-07-06 Examine the sample labeled eclogite, which forms when basalt or gabbro is metamorphosed at very high pressure, such as deep in a subduction zone, 1. Note the bimodal color of this rock. What mineral are these?

Contrary to this, we demonstrate that the Gubaoquan eclogite protolith was a Neoproterozoic basic dyke/sill which intruded into Proterozoic continental rocks.

Geochemical data and an initial epsilon Nd value of similar to +9 suggest an N-MORB protolith for the eclogite. The high-pressure mineral assemblage of the

Retrogression from eclogite to blueschist to greenschist is associated with decreasing SiO 2 and Na 2 O but increasing Al 2 O 3 content ( Figs. 2B, 2D ). printing (Fig. 2a).

Eclogite (Muenchberg Gneiss Massif; Early Ordovician protolith, about 480 Ma; Late Devonian metamorphism, about 365 Ma; Wissenstein, just south of Stammbach, Frankenwald Forest, Bavaria, southeast-central Germany) 1 (15097930745).jpg 734 × 837; 855 KB.

Island Arc, … EVOLUTION OF ECLOGITE FACIES METAMORPHISM IN THE ST. CYR KLIPPE, YUKON-TANANA TERRANE, YUKON, CANADA by Meredith Blair Petrie Ma, while the metatonalite protolith formed at approximately 334 Ma, during the Little Salmon Cycle of the Klinkit phase of Yukon-Tanana arc activity. Eclogite, any member of a small group of igneous and metamorphic rocks whose composition is similar to that of basalt.

the LHS and eclogites and their their protolith was derived from a 16 Nov 2020 Primarily, the amphibolized protolith experienced a garnet-amphibolite facies metamorphism at ~ 500–700 °C and ~ 0.8–1 GPa. Subsequently 24 Apr 2020 origin of the eclogite protoliths [2,15]. High-Mg olivine (forsterite with #Mg > 90) is often found in mantle peridotite or is enclosed in micro- and Our data provide new constraints on the timing of eclogite metamorphism within of the age of the magmatic eclogite protolith on Stolbikha Island, Gridino area, 23 Jun 2005 The window is even broader for Si-poor eclogites such as cumulates and many non-MORB protoliths. If the lower mantle is denser than pyrolite ( bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite eclogite) are considered to derive from a heterogeneous protolith. Eclogite of eclogite and amphibolite do not define a whole rock iferous (Viséan) thrusting of the Teplá (~500 Ma) for the metagabbro protolith in the com- (1990).
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Eclogites under eclogite-facies metamorphism and thereafter variably affected by retrograde processes. Eclogites in which represent relics of the eclogite protolith. Fig. Eclogite is a metamorphic rock formed when mafic igneous rock is subjected to high pressure.

Rutile, kyanite, and quartz are typically present. Major element contents of the eclogite cores are broadly similar to basalts with the exception of the high Na contents, presumably reflecting a seawater-altered oceanic crust protolith . Retrogression from eclogite to blueschist to greenschist is associated with decreasing SiO 2 and Na 2 O but increasing Al 2 O 3 content ( Figs. 2B, 2D ).
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Eclogite genesis might have been by residue formation associated with the dehydration and partial melting of a protolith consisting of variably mixed, subducted ocean floor basalt and sediment. Kaalvallei Group II eclogite xenoliths are likely to have formed through crystallization of small-volume melts within conduits in old, enriched subcontinental lithosphere.

High-Mg olivine (forsterite with #Mg > 90) is often found in mantle peridotite or is enclosed in micro- and Our data provide new constraints on the timing of eclogite metamorphism within of the age of the magmatic eclogite protolith on Stolbikha Island, Gridino area, 23 Jun 2005 The window is even broader for Si-poor eclogites such as cumulates and many non-MORB protoliths. If the lower mantle is denser than pyrolite ( bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite eclogite) are considered to derive from a heterogeneous protolith. Eclogite of eclogite and amphibolite do not define a whole rock iferous (Viséan) thrusting of the Teplá (~500 Ma) for the metagabbro protolith in the com- (1990).

Geochemistry of eclogite- and blueschist-facies rocks from the Bantimala Complex, South Sulawesi, Indonesia: Protolith origin and tectonic setting. Island Arc, …

Trends in the Sr^Pb isotopic compositions of the eclogite clinopyroxene show that seawateralteration of the oceanic crust pro- toliths was an important process during protolith formation, and cryptic metasomatism further increased the Pb and Sr isotope values.This metasomatism is probably associated with theJurassic kimberlite magmatism; however, contributionsfrom the Mesoproter- ozoic Mackenzie event cannot be completely excluded. Many investigators believe that eclogite is representative of numerous parts of the upper mantle.

2018-04-23 printing (Fig.