Max Wigley (2009): Phase relations of osumilite and reaction processes in granulite facies rocks from Namaqualand, South Africa. The base of the Tethyan Himalayan exposure has been mapped as the Chekha Formation, containing quartzite and garnetiferous schist and assigned a Neoproterozoic/Cambrian age overlain by Cambrian to younger fossiliferous horizons. The characteristic features which shed light on their P-T history are reviewed by . The main ocean closure was probably some where in ice-covered central East Antarctica within inferred blocks of 1.2–0.8 Ga mafic granitoids. Episodes of tectonic activity were previously described as orogenies. Contrasting behaviour of rare earth and major elements during partial melting in granulite facies migmatites, Wuluma Hills, Arunta Block, central Australia. [5] Several tectonic models attempt to account for the presence ofeclogitesintheEBR[e.g.,Stewartetal., 1997; Abbott and Greenwood, 2001; Miller et al., 2006]. Some of the gneisses are confined to the lower plates of two Cretaceous metamorphic core complexes in the South Island (stars in Figure 2). 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. North of the Qinling Group are early Paleozoic active margin deposits of the Sino-Korean block. what is the tectonic setting of burial metamorphism? [1] The assemblage is typical of what is formed in conditions corresponding to an area on the two dimensional graph of temperature vs. pressure (See diagram in Figure 1). Dehydration‐melting reactions, in which water from a hydrous phase enters the melt, leaving an anhydrous solid assemblage, are the dominant mechanism of partial melting of high‐grade rocks in the absence of externally derived vapour. 4.3), banded iron formation, calc-silicate rocks, quartzites, and amphibolites in the southern part of the Dharwar Protocontinent. Strain distribution within a km-scale, mid-crustal shear zone: The Kuckaus Mylonite Zone, Namibia. At higher levels, the granite gneiss rock is replaced by augen gneiss, which contains large feldspar porphyroblasts, and biotite content is more than in the lower level Sure gneiss. The earlier stage (c. 1160–1120 Ma) produced granulite facies assemblages in the Parry Sound domain and upper amphibolite facies assemblages in the Parry Island thrust sheet. It has been regarded as consisting of three tectonic events and dates from ∼1850 to ∼1690 Ma. A Practical Guide to Rock Microstructure. 10. If rocks are water saturated, they will, with a eutectic or eutectoid chemical composition near to granite, partially melt at P–T conditions in the muscovite + quartz stability field. Learn about our remote access options, Department of Geology, University of Cape Town, Rondebosch, 7700 South Africa. Exhumation of granulite-facies terranes may occur through their involvement in a separate tectonic event sometime after their high-T formation (Ellis, 1987; Harley, 1989). 7.3 Plate Tectonics and Metamorphism – Physical Geology Thus, if we know the facies of metamorphic rocks in the region, we can determine what the geothermal gradient must have been like at the time the metamorphism occurred. ... of granulites since the last granulite facies metamorphism. The final breakup of Columbia at about 1.3–1.2 Ga was immediately followed by the assembly of the supercontinent Rodinia along the globally distributed Grenvillian orogens at 1.0 Ga (Dalziel, 1997). Ma c dykes as monitors of hp granulite facies metamorphism in the Grenville front tectonic zone (western Quebec). Garnet occurs sporadically (Golani, 1995). The fundamental change in the Earth’s history at the Archaean–Palaeoproterozoic boundary was linked to the transition from Archaean “microplate tectonics” to Palaeoproterozoic “supercontinent tectonics” (or “micro-ocean tectonics” having in mind the limited size of the predominantly Red Sea-type oceans that originated within a partially disrupted supercontinent) (sections 3.4 and 3.6). The geochemistry and geochronology of the upper granulite facies Kliprand dome: comparison of the southern and northern parts of the Bushmanland Domain of the Namaqua Metamorphic Province, southern Africa and clues to its evolution. The Yixingzhai granitoid plutons are chemically similar to the Hengshan TTG gneisses, but are only metamorphosed to greenschist to lower-amphibolite facies and are less deformed, locally preserving igneous textures. Use the link below to share a full-text version of this article with your friends and colleagues. 6.12) in the following stages: (1) 1.7–1.5 Ga: Archean cratons (Dharwar, Bastar, and Napier) became sutured by fringing orogens (Karimnagar-Bhopalpatnam, CITZ, EGMB, Kemp Land), followed by narrow divergence of the Napier Craton from the Indian composite, (2) 1.3–0.9 Ga: initial 1.3 Ga convergence of India and Antarctica proceeding to final 1.0–0.9 Ga collision during the assembly of Rodinia. Mount Isa) during the Proterozoic. Anatexis during High-pressure Crustal Metamorphism: Evidence from 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. Therefore, it is abundantly evident from the available geochronological data that the EGMB must have been affected by the Neoproterozoic-Cambrian events indicating that the EGMB was juxtaposed against east Antarctica during Gondwana assembly. (2002) made a division of this sequence into two segments with a thrust in between, the Kaghtang Thrust. Metamorphism probably took place in the deep parts of a Jurassic–Early Cretaceous accretionary wedge. 322. The LSL is positioned at the central region of the HHC, much higher up from the MCT. Geological Society, London, Special Publications. In the northern part of the Oman Mountains in the Bani Hamid area, United Arab Emirates, ~870 m of granulite facies rocks (enstatite + spinel ± diopside quartzites, garnet … The model of eastern India forming a part of the linear accretionary system encompassing south-eastern Laurentia and Baltica accounts for the magmatism and metamorphism recorded in the EGMB-south (Ongole Domain) between 1.72 and 1.6 Ga leading up to continent–continent collision at c. 1.6 Ga. Accretionary orogenesis might have been possibly terminated by the collision that developed between EGMB-central and Rayner Complex at c. 1 Ga (Mezger & Cosca, 1999). Spatially‐focussed melt formation in aluminous metapelites from Broken Hill, Australia. Thermal granulite‐facies metamorphism with diffuse retrogression in Archaean orthogneisses, Fiskefjord, southern West Greenland. However, the terrane shows sporadic occurrence of granulite, tectonic slices of ophiolite, blue schist and basement Melting, carbonic fluids and water recycling in the deep crust: an example from the Limpopo Belt, South Africa. Tectonics Metamorphic Facies Metamorphism And Plate Tectonics If you ally craving such a referred metamorphic facies metamorphism and plate tectonics book that will present you worth, get the definitely best seller from us currently from several preferred authors. 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. 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. The boundaries 4, 5, and 6 in Figure 5 all mark the disappearance of plagioclase in mafic rocks towards higher pressures. These ages and the chemistry of charnockites are consistent with the formation by accretionary processes at the southern margin of the Dharwar craton. The Lindås Nappe in the Bergen Arcs is composed of granulite facies remnants of Proterozoic lower crust belonging to the former Jotun-Lindås microcontinent (Fig. Suitable conditions generally exist where passive-margin carbonates and shales are involved in continental collision. This means that assemblages of both facies occur in the same metabasalt. P.G. In mafic rocks, the presence of orthopyroxene, which forms at the expense of hornblende and/or biotite, is considered indicative of granulite facies conditions. The lower amphibolite facies rocks contain kyanite–garnet–biotite–muscovite–plagioclase–quartz–staurolite assemblage, and the higher amphibolite facies rocks bear sillimanite–muscovite–garnet–plagioclase–quartz–staurolite assemblage, and the higher amphibolite facies rocks bear sillimanite–muscovite–garnet–plagioclase–quartz ± kyanite ± staurolite ± K-feldspar. naceous facies in the east and calcareous facies in the west (Heron, 1953; Sen, 1981). McGraw-Hill. Fig. Lithoprobe—parameters, processes, and the evolution of a continent Tectonic setting of the Ottawa River ... granulite‐ and eclogite‐facies rocks in the aMP Belt commonly exhibit evidence for an amphibolite‐facies overprint of variable severity. Further volcanic rocks and metasedimentary rocks were deposited between ∼1765 and ∼1735 Ma (McGregor Volcanics, Moonabie Formation, and Wallaroo Group). Fluids, melting, granulites and granites: A commentary. Minor quartzite bands and few-meter-thick layers of amphibolite are reported to occur at different tectonic levels of the Naspe Formation. We use cookies to help provide and enhance our service and tailor content and ads. Outcrop features of granulite-facies migmatites; Vein-like and patchy charnockite in southern India; Metamorphic history of the Namaqualand granulites. In mafic rocks, the greenschist–amphibolite facies transition is designated by the appearance of hornblende and Ca-rich plagioclase and the disappearance of actinolite and Na-rich plagioclase. Roy, Ritesh Purohit, in Indian Shield, 2018. 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. 248-257. Isotopic constraints on fluid infiltration from an eclogite facies shear zone, Holsenøy, Norway. Retrograde processes in migmatites and granulites revisited, https://doi.org/10.1111/j.1525-1314.1988.tb00430.x. Working off-campus? 10.1130/0091-7613(2003)031<0051:VHDCAW>2.0.CO;2. Seemingly disparate temperatures recorded in coexisting granulite facies lithologies. Exhumation of the Haast Schist belt was episodic, with most of the schist being at the surface by 105 Ma and deeper levels being exhumed along the Alpine Fault from 20 Ma to the present day. The internal domain corresponds to the crystalline core of the orogen and comprises high amphibolite to granulite facies rocks of the Juiz de Fora Complex (Alkmim et al., 2007). sent day, different plate tectonic settings exhibit contrasts in heat flow that are registered as differing metamorphic facies series in distinct crustal terranes (Miyashiro, 1961), although how far back in time these relationships are reliable is unclear. Granulite facies xenoliths from the Yuhuashan complex, central Jiangxi, South China constraints on Late Palaeozoic orogeny and middle-lower crust components Regional granulite facies metamorphic terrains occur in all continents and Harley (1989) has listed more than eighty such terrains. A The metapelite-dominated schist horizon overlying the Sure Formation is named the Naspe Formation (Paro Formation of Gansser, 1983), which consists of a thick interlayered sequence of kyanite–staurolite–garnet–mica schist, commonly graphitic, along with dolomite (Golani, 1995). Mountain belts developed in an intracratonic set- ting during the Neoproterozoic in the center of Australia. In most of the Rodinian reconstructions, the eastern margin of India is juxtaposed against East Antarctica with the Rayner complex being correlated with the EGMB (e.g., Yoshida, Funaki, & Vitanage, 1992). [1995, 1998] used geochemical and geochronological data to argue that an Early Cretaceous magmatic arc, chemically equivalent to parts of the Median Tectonic Zone, was thrust beneath western Fiordland … Richard Palin (2008): P-T-time paths and tectonic correlation in the Karakoram Metamorphic Complex. Figure 6.12. Such a facies series is related to a geothermal gradient of 20–35 ¯C km− 1, typical of the Barrovian-type metamorphism as defined by Barrow in south-east Scotland. In contrast to the earlier belief that the source was from the adjacent Dharwar Craton, it was inferred that Napier Complex was the original source (Henderson, Collins, Payne, Forbes, & Saha, 2014). Barrovian Facies Series (medium -P regional) 4. 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. Geologic setting 2.1 Regional geology The eastern Himalayan syntaxis (EHS) (Fig.1) is the eastern termination of the (HP) granulite facies and ultrahigh temperature is sparsely pre-served but widely distributed in Phanerozoic orogenic belts and Precambrian cratons (e.g. The stability of osumilite in metapelitic granulites. J.J. Ague, in Treatise on Geochemistry, 2003. The Namaqualand Metamorphic Complex contains granulite facies rocks formed in two or more thermotectonic cycles during the mid-Proterozoic. However, the highest grade rocks in sillimanite (±cordierite) zone of Pecher and Le Fort (1986) containing leucogranites were shown by Gansser (1983) under sillimanite–granulite facies. The 90 Ma Kigluaik pluton forms the core of a granulite facies gneiss dome and is Geochemical and Sr―Nd isotopic constraints on the origin of volcanic rocks from the northern Okinawa Trough. Number of times cited according to CrossRef: Deep infiltration of surface water during deformation? Equilibria involving melt and solid phases are effective buffers of aH2,o. Furthermore, commencement of Red Sea-type spreading resulted in rapid heat discharge via spreading ridges and cessation of the high-grade metamorphism in the adjacent continental crust. From: Ultrahigh-Pressure Metamorphism, 2011, B.K. Most metamorphic terranes, especially in the internal parts of continents, are composed of greenschist, amphibolite, and granulite facies rocks, including migmatites at the high metamorphic grades. If both chlorine and CO2 contents are high, then it is likely that immiscible CO2-rich and chlorine-rich fluids would coexist at high P and T (Duan et al., 1995; Schmidt and Bodnar, 2000), consistent with fluid inclusion evidence for multi-phase granulite facies fluids (Touret, 1985; Crawford and Hollister, 1986). A metamorphic facies is a set of mineral assemblages in metamorphic rocks formed under similar pressures and temperatures. Swapp and Hollister (1991) further maintained that the leucogranites co-occurring at the top levels of were not the source of heat for the high T upper portion of the HHC. Columbia had a long-lived history of subduction related growth via accretion at important continental margins for nearly 500 Myr and a correlation of major accretionary belts of c. 1760–1700 Ma orogenesis around the preexisting cratons involving Laurentia, Antarctica, South Africa, and Australia including the eastern margin of India was proposed (Zhao, Sun, Wilde, & Li, 2004). Nonetheless, direct expulsion of CO2 from crystallizing intrusions could lower aH2O dramatically, promote granulite facies metamorphism and, in some cases, result in graphite precipitation (Farquhar and Chacko, 1991). Thermal perturbation on a regional scale might have been induced by asthenospheric upwelling following slab break-off at relatively shallow depth and consequent production of basaltic magma emplaced in the lower crust. The boundaries between facies (and corresponding areas on the tempera… The latest, most widespread and intense event at c.1150 Ma gave rise to low-P granulites which record an anticlockwise P-T path and were accompanied by gneissic granite and charnockite. The P–T–t evolution of the exhumed Himalayan metamorphic core in the Likhu Khola region, East Central Nepal. 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). 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 of Quartzofeldspathic Rocks. Geological Magazine, 126, 215-247. The processes that control leucosome compositions in metasedimentary granulites: perspectives from the Southern Marginal Zone migmatites, Limpopo Belt, South Africa. Granulite facies. A. Feenstra, G. Franz, in Reference Module in Earth Systems and Environmental Sciences, 2015. Granulite is a high-grade metamorphic rock containing granular minerals, typically red garnet mixed with grains of pyroxene, quartz, and feldspars formed under great heat without melting. The later stage (c. 1040–1020 Ma) involved widespread, dominantly upper amphibolite facies metamorphism within and beneath the duplex. A similar approach was applied to the description and interpretation of the granulite-gneiss complexes of the Grenville-Sveconorwegian … Growth of anhydrous poikiloblasts in matrix regions, development of anhydrous haloes around segregations and formation of dehydrated margins on metabasic layers enclosed in migmatitic metapelites all imply local gradients in water activity. Trace element geochemistry and tectonic setting characterization of granulite facies rocks from southwest Obudu Plateau, southeastern Nigeria.

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