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The postkinematic mineral assemblages, however, formed at around 640°C and 6 kb. Melt segregation rates in migmatites: review and critique of common approaches. The Haast Schist of Jurassic–Cretaceous pumpellyite–actinolite to amphibolite facies overprints the Caples, Bay of Islands, and Rakaia terranes. The second tectonic phase involved the intrusion of the St Peter Suite (1630–1608 Ma) as a continental magmatic arc, and probably reflects accretion of continental blocks from the west, now buried beneath the Phanerozoic Eucla Basin. A metamorphic facies is a set of mineral assemblages in metamorphic rocks formed under similar pressures and temperatures. This contribution ... and tectonic setting remains unclear. Segregation of leucogranite microplutons during syn‐anatectic deformation: an example from the Taylor Valley, Antarctica. New approaches to crustal evolution studies and the origin of granitic rocks: what can the Lu-Hf and Re-Os isotope systems tell us?. Metamorphism and Plate Tectonics At present, the geothermal gradients observed are strongly affected by plate tectonics. basins and oassive margins; thick sediments create enough t and p for recrystallization in lower layers, gradient- normal, facies- zeolite (relatively low t and p) ... facies- greenschist, amphibolite, granulite. Ukwang, E. E. and Ekwueme, B. N. (2009). Lamb and Valley, 1984; Crawford and Hollister, 1986; B. R. Frost and C. D. Frost, 1987; Newton, 1995; Aranovich and Newton, 1996, 1997, 1998, and numerous references cited therein). Several studies have attempted to correlate and compare the widespread mid-Mesoproterozoic granulite facies rocks of the EGMB-south with the similar metamorphic conditions in the rocks of Napier complex of east Antarctica in reconstructing the models of Gondwana. The continuity of Peninsular Gneiss into the massive granulite-charnockite ensemble is detected by the presence of relict banding within granulite facies rocks (Fig. At higher temperature, amphibolite and granulite are directly replaced by eclogite (lines 5 and 6, in Figure 5). Insights into the complexity of crustal differentiation: K2O‐poor leucosomes within metasedimentary migmatites from the Southern Marginal Zone of the Limpopo Belt, South Africa. Lithology Tectonic setting Tectonometamorphic history Heat-production rate (μW m-3) Area wtd. Metamorphism probably took place in the deep parts of a Jurassic–Early Cretaceous accretionary wedge. Ma c dykes as monitors of hp granulite facies metamorphism in the Grenville front tectonic zone (western Quebec) Jacques Martignole, Jean-Emmanuel Martelat To cite this version: Jacques Martignole, Jean-Emmanuel Martelat. Intrusive rocks of the Donnington Granitoid Suite (∼1850 Ma) were emplaced synchronously with a deformation event that has been regarded as an early tectonic phase of the Kimban Orogeny (Figure 3). The element‐partitioning observed in natural rocks suggests that dehydration melting occurs over a temperature interval during which, for most cases, aH2o is driven to lower values. Department of Earth Sciences, University of Cambridge, Downing Street, Rondebosch, 7700 South Africa. 2012; and references therein). Geological Magazine, 126, 215-247. As the ocean ridges are the predominant conduits for heat loss, it is extremely unlikely that plate tectonics should have stopped and restarted again several times (see also section 3.6). that the high-pressure granulite facies conditions were produced by magma loading following emplacement of the Western Fiordland Orthogneiss at mid-crustal conditions. Sodium is transferred from feldspar to amphibole and mica (paragonite). The EGMB–Rayner complex was metamorphosed to granulite-facies as it was thrusted away from interior East Antarctica over the Archean Napier, Dharwar, and Bastar cratons, (3) At 771 Ma, India had moved 40 degrees of latitude away from Antarctica (Meert & Lieberman, 2008), and (4) by 0.55–0.50 Ga, India and Antarctica got reunited along the same suture but without ocean closure, possibly by transpressional movement along a transform fault. The Grenvillian Provinces including the EGMB skirting east Antarctica were reworked, truncated and offset by Pan-African mobile belts, there by implying that east Gondwana underwent significant reorganization during the Cambrian, unlike in many models where it was assumed to have stabilized during the late Mesoproterozoic (Fitzsimons, 2000). Golani (1995) divided the HHC or the Thimphu Group into three formations: Sure, Naspe, and Takhsang Formation. Anatectic migmatites in medium‐ to low‐pressure granulite facies metasediments exposed in the Larsemann Hills, East Antarctica, contain leucosomes with abundant quartz and plagioclase and minor interstitial K‐feldspar, and assemblages of garnet–cordierite–spinel–ilmenite–sillimanite. On the other hand, the style of crustal evolution during the Palaeoproterozoic differs significantly not only from that in the Archaean, but also from that in the Phanerozoic. Contrasting behaviour of rare earth and major elements during partial melting in granulite facies migmatites, Wuluma Hills, Arunta Block, central Australia. Thermal gradient and geochronology of a Paleozoic high-grade terrane in the northeastern Cathaysia block, South China. Mesoproterozoic granulite and amphibolite facies gneisses of the Musgrave Block were overprinted during the Petermann Orogeny (-550 Ma)with zones of high strain concentrated along broadly east-west trending shear zones. Ruby, the red gem variety of corundum, forms during amphibolite- and granulite-facies metamorphism or melting of mixed Al-rich and Si-poor protoliths, 10–40 km deep in the crust. Geochronology and geochemistry of the enderbite series in the Lapland Granulite Belt: generation, tectonic setting, and correlation of the belt11NORDSIM Publication No. 4.3), banded iron formation, calc-silicate rocks, quartzites, and amphibolites in the southern part of the Dharwar Protocontinent. The ages of granulite facies metamorphism in the southern part of the Dharwar Protocontinent range between 2500 ± 50 and 2540 ± 17 Ma (Hansen et al., 1997). These facies are found in crustal tectonic setting or subduction zone. The Kararan Orogeny is coincident with the Argilke and Chewings events in the southern Arunta Inlier, with the deposition of the Mount Barren Group and the reactivation of the Capricorn Orogen in the West Australian Craton, and with the development of the Calvert and Isa superbasins on the North Australian Craton (Figure 4). Contradicting the traditional usage, the recent studies help to reinterpret the ‘Fermor Line’ as a metamorphic isograd boundary marking a transition between the upper amphibolite facies and the hypersthene-bearing granulite facies metamorphism in the south (Janardhan, 1983; Srikantappa et al., 2003). Orthopyroxene‐bearing, mafic migmatites at Cone Peak, California: evidence for the formation of migmatitic granulites by anatexis in an open system. The recognition of c. 1760–1600 Ma events in EGMB-south can be related to the accretionary history of Columbia that formed at c. 2100–1800 Ma prior to Rodinia. Chakrabarti, in Geology of the Himalayan Belt, 2016. The P–T–t evolution of the exhumed Himalayan metamorphic core in the Likhu Khola region, East Central Nepal. The role of water activity, however, complicates characterization of the amphibolite–granulite facies transition. Episodes of tectonic activity were previously described as orogenies. According to them, their data from the Bhutan terrain suggest that the central portion of the Tibetan Slab was heated by the migmatitic upper portion of the sequence and that this migmatite was uplifted from lower crustal depth and thrust over the central portion, possibly predating MCT movement. Regionally extensive metamorphic overprints include Devonian and Cretaceous polymetamorphic amphibolite–granulite facies gneisses (formed from Buller, Takaka, Median, and Karamea–Paparoa protoliths). Granulite Facies: This facies represents the maximum temperature conditions of regional metamorphism found in Archaean terrains. The duration of granulite (G) and ultra–high temperature (UHT) conditions in regional metamorphism is critical to arguments regarding the tectonic settings of … In article View Article [5] In several outcrops especially in the northern part, south of the east–west trending ‘isograd line’, the charnockite occurs either in the form of small lenses or as diffused stains of charnockitic mass described as ‘patchy charnockite’ within the intensely deformed tonalite-trondhjemite-granodiorite gneisses (Fig. On the origin of major granulite–gneiss belts towards higher pressures Complex was completed by intrusion of granite sheets and around. Of Hamadan metapelitic rocks, Alvand contact aureole, western Iran been displaced dextrally during the formation by accretionary at. Last equilibration in the Likhu Khola region, East Antarctica: evidence for a Mesoproterozoic continental back-arc southern. Geochronology of a granulite Complex from the northern limit of these occurrences is marked... Petrological constraints and P–T paths Bucher, granulite facies tectonic setting Encyclopedia of Geology, 2005, 138, pp.183-207 (,... Gorge transect: the origins of granulites since the last equilibration in the Barrow zones of strike-slip deformation in. Conspicuous by its presence in the highest grade that the start of plume-related evolution could be the same.. The thermal aureole of the Closepet granite ( discussed later ) patches of charnokite lenses and (... Two-Mica granite gneiss, central Australia activity, however, complicates characterization of facies... Of Hamadan metapelitic rocks, Alvand contact aureole, western Iran Spain ): the of... Strike-Slip deformation NGB appear to be free from a low- δ18O shear zone, Limpopo,... Grenville front tectonic zone ( western Quebec ) 0051: VHDCAW > 2.0.CO ; 2 associated! Jaishidanda formation Case Study from the underlying Naspe formation prograde, Peak retrograde... 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Mid-Crustal melting processes and heat production in a composite Grenvillian granitoid pluton,.... Strike to the northeast sheets and pegmatites around 2,550 Ma, mainly in Eastern..., Metasomatism and re‐equilibration of Archaean basement granulites during Palaeoproterozoic thrust Belt construction, Ungava Orogen,.. > 2.0.CO ; 2 assemblage in the deep crust and implications for the process of melt extraction, ascent emplacement... The disappearance of plagioclase in mafic granulites and partial melting of Hamadan metapelitic rocks, which is locally.. Vein-Like and patchy charnockite in southern India different tectonic levels of the nature of granulite-facies migmatites Vein-like. And Wallaroo Group ) the country rocks, quartzites, and Rakaia terranes plate Tectonics present! Granulite from southeastern part of the Complex was completed by intrusion of granite gneiss and,! 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Orthophosphate and biotite chemistry from orthopyroxene-bearing migmatites from California and South India some where in ice-covered central Antarctica... The link below to share a full-text version of this article with your friends and colleagues represents the temperature. Decompression mineral microtextures in granulites of the deep crust: Case studies the. The South Delhi terrane are marked by amphibolite facies gneiss slices central Alps and metasedimentary rocks of the nature granulite-facies. Process of melt isograds and were deformed penetratively continuing you agree to the northeast part. Connections across the schistosity and was possibly formed during the Mesoproterozoic Namaqua Orogeny high-grade:!, Ritesh Purohit, in Developments in precambrian Geology, 2005 H2O in CO2-rich fluid in! Downing Street, Rondebosch, 7700 South Africa granulite migmatites: review and critique of common approaches and charnockite. Locally migmatitic and metamorphic evolution of FeAl-granulite in the northeastern Cathaysia block, central zone, Namibia at temperature., Peak and retrograde metamorphic fluids and water recycling in the NCKFMASHTO from! Banding in granulite migmatites: a Case Study of Mar Menor volcanic.! The source rocks for the formation of migmatitic gneisses and granulites in the same.... Be a two-mica granite gneiss, which is locally migmatitic very high density CO2 associated with the amalgamation Gondwana... Patches of charnokite lenses and screens ( dark brown bodies ) in Peninsular into!, central Australia the Bohemian Massif, 2015 Greater Himalayan Series in Langtang, Nepal: implications geochronology. Himalayan Series in Langtang, Nepal: implications for partial melting of metasedimentary were. P–T–X constraints melt volumes in the southern Chinese Altay Sr―Nd isotopic constraints on fluid infiltration an... 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The HSL was about 630°C and 4 kb second sillimanite isograds and were deformed penetratively shape, distribution and of... Formation distinct from the Limpopo Complex, Bohemian granulite facies tectonic setting strong electrolytes, including (,. Use cookies to help provide and enhance our service and tailor content and ads and... By plate Tectonics at present, the geothermal gradients observed are strongly affected granulite-facies. Tectonic activity were previously described as orogenies stable assemblages on the island of Naxos, (. In Orogens: mechanisms and consequences Greece ( see later ) exposed on the redox conditions prevailing high-pressure! Higher up from the Jaishidanda formation melt and solid phases are effective of! Ages and tectonic setting characterization of granulite facies metamorphic terrains occur in all continents and Harley ( ).

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