granulite facies tectonic setting

28(3), pp. The spatial and temporal patterning of the deep crust and implications for the process of melt extraction. Melt segregation rates in migmatites: review and critique of common approaches. what is the tectonic setting of burial metamorphism? Ex: Usually Granodiorite, Tonalite. Thermal gradient and geochronology of a Paleozoic high-grade terrane in the northeastern Cathaysia block, South China. Granulite Gallery Petrological features of granulites, charnockites and migmatites. Proceedings of the Geologists' Association. Very high density CO2 associated with ultrahigh-temperature metamorphism in the Eastern Ghats granulite belt, India. Further volcanic rocks and metasedimentary rocks were deposited between ∼1765 and ∼1735 Ma (McGregor Volcanics, Moonabie Formation, and Wallaroo Group). At low temperature, albite-bearing mafic rocks are replaced by assemblages with sodic amphibole (line 4, in Figure 5). You may make use of these … Petrology of an intrusion‐related high‐grade migmatite: implications for partial melting of metasedimentary rocks and leucosome‐forming processes. Crystallization of Heterogeneous Pelitic Migmatites: Insights from Thermodynamic Modelling. Fluid-rock interaction during high-grade metamorphism: Instructive examples from the Southern Marginal Zone of the Limpopo Complex, South Africa. Max Wigley (2009): Phase relations of osumilite and reaction processes in granulite facies rocks from Namaqualand, South Africa. The granulite facies is determined by the lower temperature boundary of 700 +/− 50 °C and the pressure range of 2–15 kb. Geological Setting of the Bergen Arcs. Large‐scale fluid infiltration, metasomatism and re‐equilibration of Archaean basement granulites during Palaeoproterozoic thrust belt construction, Ungava Orogen, Canada. In other words, the concept implies a continuity of the Archaean Dharwar rocks further south of the defined boundary. This is mostly due to the strong dependence of the stable assemblages on the redox conditions prevailing during high-pressure metamorphism. Accessory Mineral Behaviour in Granulite Migmatites: a Case Study from the Kerala Khondalite Belt, India. medium-pressure granulite-facies metamorphism in the southern Nawa Domain (Cutts et al. During this final assembly of Gondwana, the orogen was further deformed through thrusting and strike-slip shearing of the Rayner Complex against the Archean Napier Complex and the EGMB against the eastern margin of Archean Dharwar/Bastar cratons, (5) 0.3–0.2 Ga Permian–Triassic: the conjugate margins were crossed by a system of rift valleys, which accumulated the Gondwana succession of basal glacial sediments followed by coal measures and red beds, (6) 0.16–0.14 Ga Jurassic-Cretaceous: after preliminary rifting, continental breakup along the EGMB–Rayner complex, (7) to 0 Ma: the newly formed margins accumulated onlapping drift successions. The cordierite‐bearing anatectic rocks of the higher Himalayan crystallines (eastern Nepal): low‐pressure anatexis, melt productivity, melt loss and the preservation of cordierite. Retrograde processes in migmatites and granulites revisited, A Practical Guide to Rock Microstructure. All the tectonothermal events in the region including the UHT metamorphism can be considered as part of this accretionary process. Concentrated aqueous solutions of strong electrolytes, including (Na,K)Cl, would have low aH2O, as would CO2-rich fluids. Thus, the tectonic setting of the eclogite facies was somewhat enigmatic. Besides, the mafic granulite lenses hosted within the opx–ksp gneiss also show a metamorphic age of ∼255 Ma (Chen et al., 2006). Gansser (1983) reported isolated exposures of Precambrian to Mesozoic sedimentaries over the Thimphu Group/HHC/Great Himalayan zone as a remnant of the Tethyan Himalayan sequence. It is contemporaneous with the Capricorn Orogeny and the Yapungku Orogeny in the West Australian Craton, and the Early and Late Strangways orogenies in the North Australian Craton, and may represent a series of intraplate and plate margin events reflecting convergence and accretion of the Gawler Craton to what was then the south-eastern North Australian Craton. Felsic and bimodal volcanics and interlayered metasedimentary rocks of the Myola Volcanics and the Broadview Schist, and the Peake Metamorphics were deposited on the Gawler Craton ∼1790 Ma, contemporaneous with syntectonic granitic rocks of the Lincoln Complex. The interpretation was further extended that the EGMB-south represents a part of an exotic terrane, which was transferred to proto-India in the late Paleoproterozoic as part of a linear accretionary orogenic belt that may also have included south-west Baltica and southeastern Laurentia. Charnockitization of feldspar-free orthopyroxene-clinopyroxene-phlogopite metaultramafite in the lapland granulite belt, southern Kola Peninsula: Compositional trends of rocks and minerals, P-T parameters, and fluid regime. In this paper, we summarize the Proterozoic tectonother- mal evolution of the Broken Hill Block in light of structural, metamorphic and geochronological analysis conducted within a high-temperature shear zone located in the south of the terrane (Forbes et al., 2005, 2007). The rocks in NGB were metamorphosed to granulite facies conditions during Neoarchean to Palaeoproterozoic, with relatively high-pressure (HP) (~14 kbar) metamorphism occurring during the early Neoproterozoic (Peucat, Mahabaleshwar, & Jayananda, 1993). Water budget and partial melting in an Archean crustal column: example from the Dharwar Craton, India. 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). The amphibolite to granulite facies rocks overlying the MCT occupies a vast expanse of Bhutan and is named the Thimphu Group/Great Himalayan Zone/HHC/Tibetan Slab (Fig. 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). 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). This age is also highly coeval with the timing of the nearby mantle–derived mafic intrusions (∼257 Ma) In the Gawler Craton, Archaean gneissic rocks of the Sleaford and Mulgathing complexes were deformed, metamorphosed to, Reference Module in Earth Systems and Environmental Sciences, Most metamorphic terranes, especially in the internal parts of continents, are composed of greenschist, amphibolite, and. The boundaries 4, 5, and 6 in Figure 5 all mark the disappearance of plagioclase in mafic rocks towards higher pressures. On ultrahigh temperature crustal metamorphism: Phase equilibria, trace element thermometry, bulk composition, heat sources, timescales and tectonic settings. Please check your email for instructions on resetting your password. Mesoproterozoic granulites of the Shillong–Meghalaya Plateau: Evidence of westward continuation of the Prydz Bay Pan-African suture into Northeastern India. Metamorphism of Quartzofeldspathic Rocks. Swapp and Holister (1991) studied the amphibolite and sillimanite–granulite facies rocks of Gansser (1983). Regional granulite facies metamorphic terrains occur in all continents and Harley (1989) has listed more than eighty such terrains. Orthopyroxene–sillimanite–quartz assemblages: distribution, petrology, quantitative P–T–X constraints and P–T paths. (a) Development of patches of charnokite lenses and screens (dark brown bodies) in Peninsular Gneiss. The hot central and upper portion together were rapidly exhumed during and after the thrusting event. Buchan or Abukuma Facies Series (low -P regional) 3. Metamorphic petrologists studying contact metamorphism early in the 20th century introduced the idea of metamorphic facies (part of a rock or group of rocks that differs from the whole formation) to correlate metamorphic events. Sensitive High Resolution Ion Microprobe (SHRIMP) U–Pb isotope analyses of zircon from a charnockite and a charnockite-hosted leucosome reveal that the felsic magmatism occurred at 2.53 Ga, which was followed by high-grade metamorphism and anatexis at 2.48 Ga (Clark, Collins, Kinny, Timms, & Chetty, 2009). Roy, Ritesh Purohit, in Indian Shield, 2018. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. They also observed that reaction textures and geothermobarometry indicate high-temperature decompression of the upper portion of the Tibetan Slab to nearly 4 kb from a higher pressure. A variety of mechanisms for generating low aH2O fluids have been proposed, including infiltration of connate brines or fluids equilibrated with metaevaporites, loss of H2O to anatectic melts leaving behind residual fluids enriched in salts and CO2 (Fyfe, 1973; Philippot, 1993), release of brines and CO2 from deep crustal intrusions (Hansen et al., 1995), and loss of H2O to retrograde rehydration reactions (Markl et al., 1998). High-pressure partial melting and melt loss in felsic granulites in the Kutná Hora complex, Bohemian Massif (Czech Republic). Clockwise, low- metamorphism of the Aus granulite terrain, southern Namibia, during the Mesoproterozoic Namaqua Orogeny. In metapelites, staurolite-bearing assemblages gradually replace chloritoid-bearing assemblages. Structural and metamorphic evolution of the Nanga Parbat syntaxis, Pakistan Himalayas, on the Indus gorge transect: The importance of early events. The origin of high temperatures during regional low-pressure granulite facies metamorphism within the Proterozoic Broken Hill Block, Australia, has been reinterpreted to be the result of burial of anomalously ... tectonic setting, and its relationship to other similar Australian … We use cookies to help provide and enhance our service and tailor content and ads. Considering the worldwide decrease of magmatic activity from c. 2.45 to 2.2 Ga, Condie (1994b) argued that deep-seated heat generation processes in the Earth could not have been significantly lower during that period.

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