Готові списки джерел за темами / Southern granulite terrane

Добірка наукової літератури з теми "Southern granulite terrane"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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Статті в журналах з теми "Southern granulite terrane"

Santosh, M. "The Southern Granulite Terrane: A synopsis." Episodes 43, no. 1 (March 1, 2020): 109–23. http://dx.doi.org/10.18814/epiiugs/2020/020006.

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Li, Shan-Shan, Richard M. Palin, M. Santosh, E. Shaji, and T. Tsunogae. "Extreme thermal metamorphism associated with Gondwana assembly: Evidence from sapphirine-bearing granulites of Rajapalayam, southern India." GSA Bulletin 132, no. 5-6 (October 10, 2019): 1013–30. http://dx.doi.org/10.1130/b35378.1.

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Abstract The Madurai block is the largest composite crustal block in the Southern Granulite terrane of India, where granulite-facies rocks metamorphosed at ultrahigh-temperature (UHT) conditions occur in several localities. Here, we investigated UHT rocks from Rajapalayam, in the southern domain of the Southern Granulite terrane, using integrated thermobarometry and in situ monazite geochronology to precisely constrain the nature and timing of this extreme metamorphism and its implications for regional tectonics. Conventional thermobarometry and petrological phase equilibrium modeling reveal prograde pressure-temperature (P-T) conditions at 0.75–1.2 GPa and <900 °C, followed by peak/postpeak UHT metamorphism at 0.72–0.82 GPa and 1025–1050 °C, and retrograde reequilibration at 0.72–0.80 GPa and 875–895 °C. The granulites thus record a clockwise P-T path defining geothermal gradients of 1200–1500 °C/GPa at peak metamorphism, indicating the presence of an extreme thermal perturbation in the middle to lower continental crust. In situ monazite dating indicates prograde metamorphism at 607–585 Ma, peak metamorphism at 546–543 Ma, and retrograde cooling and exhumation at 539–483 Ma. As such, the entire tectonothermal cycle was complete within ∼120 m.y., although temperatures exceeding 900 °C were likely sustained for at least 30 m.y. Such extreme thermal events preserved in geological terranes worldwide are commonly associated with lithospheric extension, although our data show that prolonged heating can occur during continental convergence instead, supporting inferences made by thermomechanical models. Thus, supercontinent formation may act as a driver for spatially distributed UHT tectonometamorphism, as shown by the episodic records in geological history. The age of peak metamorphism constrained here was synchronous with UHT metamorphism in other localities in the Southern Granulite terrane, Sri Lanka, Madagascar, and Antarctica, indicating their correlation with the final amalgamation of eastern Gondwana at ca. 550 Ma.

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KIHLE, J., and K. BUCHER-NURMINEN. "Orthopyroxene?sillimanite?sapphirine granulites from the Bamble granulite terrane, southern Norway." Journal of Metamorphic Geology 10, no. 5 (September 1992): 671–93. http://dx.doi.org/10.1111/j.1525-1314.1992.tb00114.x.

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Sajeev, K. "The Tectonic and Metamorphic Perspective of Southern Granulite Terrane, India." Journal of the Geological Society of India 97, no. 9 (September 2021): 1112. http://dx.doi.org/10.1007/s12594-021-1830-z.

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George, P. M., M. Santosh, Nengsong Chen, V. Nandakumar, T. Itaya, M. K. Sonali, R. P. Smruti, and K. Sajeev. "Cryogenian magmatism and crustal reworking in the Southern Granulite Terrane, India." International Geology Review 57, no. 2 (January 23, 2015): 112–33. http://dx.doi.org/10.1080/00206814.2014.999260.

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Wang, Runsan, Dingwu Zhou, Juli Wang, Yan Wang, and Yangjie Liu. "Variscan terrane of deep-crustal granulite facies in Yushugou area, southern Tianshan." Science in China Series D: Earth Sciences 42, no. 5 (October 1999): 482–90. http://dx.doi.org/10.1007/bf02875242.

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Gilotti, Jane A., and Synnøve Elvevold. "Extensional exhumation of a high-pressure granulite terrane in Payer Land, Greenland Caledonides: structural, petrologic, and geochronologic evidence from metapelites." Canadian Journal of Earth Sciences 39, no. 8 (August 1, 2002): 1169–87. http://dx.doi.org/10.1139/e02-019.

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The Payer Land gneiss complex is unique among the mostly amphibolite-facies, mid-crustal gneiss complexes in the East Greenland Caledonides due to its well-preserved, regional high-pressure (HP) granulite-facies metamorphism. High-pressure high-temperature (HPHT) assemblages are recognized in mafic, ultramafic, granitic, and metasedimentary lithologies. Anatectic metapelites contain the assemblage garnet + kyanite + K-feldspar + antiperthite (exsolved ternary feldspar) + quartz ± biotite ± rutile and record approximately the same peak metamorphic conditions (pressure (P) = 1.41.5 GPa, temperature (T) = 800850°C) as those of the neighboring mafic HP granulites. The HP granulite-facies metamorphism is Caledonian based on in situ UThPb electron microprobe dating of monazite from two samples of the aluminous paragneiss. The monazites are found along garnetkyanite phase boundaries, as inclusions in garnet and kyanite, and within small leucocratic melt pods (K-feldspar + plagioclase + kyanite ± garnet) within the HPHT paragneisses. Mylonitic equivalents of the metapelites contain a detrital monazite age signature that suggests the Payer Land paragneisses correlate with other Mesoproterozoic metasedimentary sequences in the area. The gneisses form a metamorphic core complex that is separated from the overlying low-grade sedimentary rocks of the Neoproterozoic Eleonore Bay Supergroup by an extensional detachment. This newly recognized Payer Land detachment is part of a system of prominent extensional faults located in the southern half of the Greenland Caledonides (i.e., south of 76°N). The HP granulites preserve the deepest level of crust exposed in this southern segment of the orogen and attest to significant crustal thickening.

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Karmakar, Shreya, Subham Mukherjee, and Upama Dutta. "Origin of corundum within anorthite megacrysts from anorthositic amphibolites, Granulite Terrane, Southern India." American Mineralogist 105, no. 8 (August 1, 2020): 1161–74. http://dx.doi.org/10.2138/am-2020-7108.

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Abstract Growth of corundum in metamorphosed anorthosites and related basic-ultra-basic rocks is an exceptional feature, and its origin remains elusive. We describe the occurrence of and offer an explanation for the genesis of corundum in anorthositic amphibolites from ~2.5 Ga old basement of the Granulite Terrane of Southern India (GTSI). The studied amphibolites from two localities, Manavadi (MvAm) and Ayyarmalai (AyAm), contain anorthite lenses (An90–99) with euhedral to elliptical outline set in a finer-grained matrix of calcic plagioclase (An85–90) and aluminous amphibole (pargasite-magnesiohastingsite). The lenses, interpreted as primary magmatic megacrysts, and the matrix are both recrystallized under static condition presumably during the regional high pressure (HP) metamorphism (~800 °C, 8–11 kbar) at ~2.45 Ga. Corundum occurs in the core of some of the recrystallized anorthite lenses (An95–99) in two modes: (1) Dominantly, it forms aggregates with magnetite (with rare inclusion of hercynite; in MvAm) or spinel (and occasionally hematite-ilmenite; in AyAm). The aggregates cut across the polygonal grain boundaries of the anorthite and contain inclusions of anorthite. (2) Corundum also occurs along the grain boundaries or at the triple junctions of the polygonal anorthite grains, where it forms euhedral tabular grains, sieved with inclusions of anorthite or forms skeletal rims around the recrystallized anorthite, such that it seems to be intergrown with anorthite. Combined petrological data and computed phase relations are consistent with growth of corundum in an open system during regional metamorphism in the presence of intergranular fluids. Two mechanisms are proposed to explain the formation of the corundum in the amphibolites: (1) corundum + magnetite/spinel aggregates formed dominantly by oxy-exsolution of pre-existing Al-Fe-Mg-(Ti)-spinel. This pre-existing spinel may be primary magmatic inclusions within the anorthite phenocrysts or could have formed due to reaction of primary magmatic inclusions of olivine with the host anorthite. Pseudosections of fO2-nH2O-T-P in the CaO–FeO–MgO–Al2O3–SiO2–H2O (CFMASH) system indicate that fO2 and H2O strongly influence the formation of corundum + amphibole from the initial magmatic assemblage of anorthite (phenocrysts) + spinel ± olivine (inclusions). (2) The corundum with anorthite presumably formed through desilification and decalcification of anorthite, as is indicated by computed phase relations in isobaric-isothermal chemical potential diagrams (µSiO2-µCaO) in parts of the CASH system. Growth of corundum in this mode is augmented by high activity of anorthite in plagioclase, high pressure, and low-to-medium temperature of metamorphism. This study thus presents a new viable mechanism for the origin of corundum in anorthositic amphibolites, and basic-ultra-basic rocks in general, which should provide new insight into lower crustal processes like high-pressure metamorphism.

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Rao, V. Vijaya, Kalachand Sain, P. R. Reddy, and Walter D. Mooney. "Crustal structure and tectonics of the northern part of the Southern Granulite Terrane, India." Earth and Planetary Science Letters 251, no. 1-2 (November 2006): 90–103. http://dx.doi.org/10.1016/j.epsl.2006.08.029.

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JingLi, WANG, and ZHANG HongFu. "Formation and evolution of lower crustal granulite terrane in the southern North China Craton." Acta Petrologica Sinica 38, no. 12 (2022): 3819–34. http://dx.doi.org/10.18654/1000-0569/2022.12.18.

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Дисертації з теми "Southern granulite terrane"

Ghosh, Joy Gopal. "U-Pb geochronology and structural geology across major shear zones of the Southern granulite terrain of India and organic carbon isotope stratigraphy of the Gondwana coal basins of India : their implications for Gondwana studies." Doctoral thesis, University of Cape Town, 1998. http://hdl.handle.net/11427/9571.

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Bibliography: p. 277-308.
This thesis is divided into 2 parts. The first part (Chapters 1-5) concentrates on unravelling the . Precambrian geological history of the high-grade poly-metamorphic and poly-deformed basement of southernmost India, using field geology and U-Pb geochronology. Because Peninsular India occupied a central position in Gondwana, this work bears on reconstruction models of central Gondwana between circa 600 Ma and 200 :f1,a. The second part of the thesis (Chapter 6) tests the use of organic carbon isotopes as a chemostratigraphic tool to correlate between the lower part of terrestrial Gondwana (Upper Carboniferous to Triassic) sequences in India. This work contributes to (i) intra-basinal and inter-basinal stratigraphic correlation and carbon isotope variations during the Pennian-Triassic extinction event of Gondwana; and (ii) refines the inter-continental correlations of the Gondwana type sequences in India with those in South Africa and Madagascar. This century much attention has been focused on the reconstruction of Gondwana, and as a result, the broad relative positions of different Gondwana fragments and their later dispersal histories is now well understood. Finer-scale reconstructions, based on modern geochronological and isotope studies integrated with field studies of continental rocks, are still needed to resolve the detailed kinematic histories of continental break-up and the evolution of continental lithosphere in general. Shear zones that cross the boundaries of continental fragments provide 'piercing points' in fitting the fragments back together. To realize this, the kinematics and the timing of major shear zones need to be determined. The first part of this thesis, therefore, primarily focuses on understanding the kinematics and geochronology of a number of subvertical continental scale shear zones in the Southern Granulite Terrain of India (SGT).

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Plavsa, Diana. "The tectonic evolution of the Southern Granulite Terrane of India and its role in the amalgamation of Gondwana." Thesis, 2014. http://hdl.handle.net/2440/84918.

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The southernmost portion of the Indian subcontinent, the Southern Granulite Terrane of India, holds a pivotal role in the reconstructions of the Ediacaran-Cambrian supercontinent Gondwana. Bound to the west by Madagascar and the East African continental fragments and to the east by Sri Lanka and Antarctica, this terrane offers a breadth of information regarding across terrane correlations and palaeotectonic settings, Arguably, within the Southern Granulite Tenane, the most debated issue of all is the existence of a late Neoproterozoic (ca. 550 - 500 Ma) suture zone between the Salem and Madurai Blocks, termed the Palghat Cauvery ShearZone (or alternatively, the Cauvery Shear Zone). The U-Pb zircon geochronology of the orthopyroxene-bearing orthogneisses (charnockites) in the northern part of Madurai Block yielded Neoarchaean and Cryogenian (ca.2.7 - 2.5 Ga and 795 ± 17 Ma) crystallization ages with metamorphic overprinting at ca. 535 Ma. Their Nd and Sr isotopic ratios (εNd₍τ₎ = -16.9 and +4.55, ⁸⁷Sr/⁸⁶Sr = 0.7017 - 0.7567) suggest they were generated by variable mixing of mantle-derived magmas with the older Archaean crust. The charnockites and garnet-biotite bearing granitoids in the southern part of the Madurai Block yielded much younger crystallization (1007 ± 23 Ma and 784 ± 18Ma) and Nd depleted mantle model ages ranging between 1.69 Ga and 1.38 Ga with low initial ⁸⁷Sr/⁸⁶Sr ratios of 0.7054 - 0.7084, suggesting that the Madurai Block is not a uniform crustal domain, The age of metamorphism in this southern part of the Madurai Block is similar to that further north and indicates isotopic disturbance and zircon growth during the Ediacaran-Cambrian metamorphism. The coupled U-Pb and Lu-Hf isotopic study of the metasedimentary rock packages from the Salem Block mainly yielded late Archaean to early Palaeoproterozoic (ca. 2.7 - 2.45 Ga) detrital zircon ages with εHf values between +0.3 and +8.8, suggesting derivation from largely juvenile sources. ln contrast, the metasedimentary rocks from the Madurai Block are dominated by Mesoarchean to Palaeoproterozoic detrital zircon ages (ca. 3.2 Ga and 1.7 Ga) to the north and Mesoproterozoic to Neoproterozoic (ca. 1.5 - 0.65 Ga) detrital zircon ages in the south. Collectively, the Hf isotopic signatures of detrital zircons from the Madurai Block suggest they were derived from variably mixed reworked Archaean and Palaeoproterozoic sources, with additional input from the juvenile Palaeoproterozoic, late Mesoproterozoic and evolved Neoproterozoic sources. When compared to the metasedimentary rock packages from adjacent tenanes in Gondwana, the Madurai Block metasedimentary rock units correlate best with the basement sources derived from East Africa. The disparity between the delrital signatures from the Salem and Madurai Block suggest they had dissimilar depositional histories until the latest Neoproterozoic, The Palghat Cauvery Shear System (PCSS) at the southernmost margin of the Salem Block, represents a network of anastomosing crustal-scale shear zones with a largely dextral offset. The careful structural field observations coupled with U-Pb zircon geochronology of cross-cutting pegmatites, leucosomes and deformed basement gneisses show that the deformation in the Palghat Cauvery Shear System (southern Salem Block) is not a result of a single deformational event. Rather, the E-W and NE-SW trending fabrics that characterize much of the northern portion of the PCSS formed during an early Palaeoproierozoic (ca. 2.5 - 2.48 Ga) metamorphic event associated with largely dextral strike-slip motion. This deformation is overprinted by the E-W and ESE-WSW trending fabrics in the southern part of the PCSS (the Cauvery Shear zone) associated largely with dip-slip and minor dextral strike-slip contractional deformation suggesting dextral transpression. This latest deformation is loosely constrained to ca. 740 - 550 Ma. The Madurai Block deformational events (D₁– D₄) are different in character to those further north and are constrained to ca. 550 - 500 Ma. The latest Neoproterozoic event (ca. 550 - 500 Ma) appears to have affected both the southern portion of the Salem Block and all of the Madurai Block and is most likely linked to the final stages of Gondwana amalgamation. This study also suggest that care should be taken when regarding the regional-scale structural fabrics of the PCSS as being associated with the latest Neoproterozoic metamorphism. The Southern Granulite Terrane records two major episodes of magmatism at ca. 2.7 - 2.43 Ga and 0.83 - 0.75 Ga. ln the Salem Block, the ca. 2.7 – 2.5 Ga magmatism is associated with production of tonalitic-trondhjemitic-granitic (TTG) magmas during partial melting of basaltic/amphibolitic sources with limited contributions directly from the mantle, similar to the "typical" Archaean TTG provinces worldwide. Somewhat younger (ca. 2.54 - 2.43 Ga) basement rocks in the Madurai Block also show some similarities to the Archean TTG rocks further north. However, a large portion of the gneisses also show higher K₂O/Na₂O ratios, Ni and Cr concentrations and Mg numbers (molar ratio of MgO/(MgO + FeO)) suggesting higher inputs from the mantle during their genesis. The Cryogenian aged magmatism (ca. 0.8 - 0.75 Ga) in the Salem Block is associated with production of highly alkaline magmas (syenites/carbonitites/ultramafics), while in the Madurai Block similarly aged magmas are calc-alkaline, largely granitic to granodioritic, with high LILE/HFSE and LREE/HFSE ratios, low Ni and Cr concentrations typical of magmas generated above a subduction-zone. The differences in the structural character, age and geochemistry of the basement gneissic rocks as well as the differences in the depositional histories of the metasedimentary rock units between the Salem and Madurai Blocks suggests these two domains underwent widely different tectonothermal histories prior to the latest Neoproterozoic orogeny associated with the amalgamation of Gondwana. This study strongly supports a presence of a terrane boundary (a suture zone) between the Salem and Madurai Blocks.
Thesis (Ph.D.) -- University of Adelaide, School of Earth and Environmental Sciences, 2014

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Anderson, J. R. "High-P-T early Palaeoproterozoic metamorphism in southern India." Thesis, 2010. http://hdl.handle.net/2440/98283.

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Southern India is comprised of granulite facies metamorphosed crustal blocks, separated by crust penetrating shear zones that have experienced a diverse tectonothermal history from the Archaean to Cambrian. The early Palaeoproterozoic metamorphosed Salem Block in southern India preserves felsic and mafic gneisses ideal for investigating the aerial extent of the preserved Archaean-Palaeoproterozoic southern Indian crust and the metamorphic rock record in the Archaean-Palaeoproterozoic transition. U-Pb zircon, in situ monazite geochronology and zircon REE analysis obtained using Laser-Ablation Inductively-Coupled-Plasma Mass-Spectrometry (LA-ICP-MS), and P-T phase equilibria and average P-T conventional thermobarometry calculated using THERMOCALC from the Kanja Malai Hills, demonstrate that the Salem Block extends south to at least the northern Palghat-Cauvery Shear System. Peak P-T estimates of ~800-850 ºC and 14-16 kbar at ca. 2490 Ma were attained in the southern Salem Block and suggest decompression followed peak metamorphism. The P-T-t constraints in the southern Salem Block are anomalously high pressure compared to other Archaean-Palaeoproterozoic metamorphic events and require thermal regimes that are typically generated in convergent plate margin settings.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 2010

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Riciputi, Lee Remo. "Archean granulite metamorphism in the Nordlandet and Tasiusarsuaq terranes, southern West Greenland." 1987. http://catalog.hathitrust.org/api/volumes/oclc/17534985.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1987.
Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 38-43).

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Basava, Sharana. "Metamoraphic history of granulite grade lithologies and associated igneous rocks viz., carbonatites and syenites around periyakulam and varushanadu licalities: Implications for the evolution of 550 ma old southern granulite terrain." Thesis, 2002. http://hdl.handle.net/2009/3122.

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Mathews, George Paul. "Evolutionary Aspects of Archean Kolli-Massif, Southern India : An Archive of Crustal Processes." Thesis, 2015. http://etd.iisc.ernet.in/2005/3954.

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The continental crust is the record of the history of the Earth, of the processes and events that have contributed to the planet's evolution. It is now understood that the continental crust is growing continuously since the early ages of the Earth. Archean-Proterozoic boundary marks one of the major transition periods in the crustal evolution processes. However, there are only few crustal remnants available to investigate this milestone of Earth history, reported with significant chemical discontinuity. The Neoarchean crustal fragments of southern India provide a window to probe the processes that happened during such transitions. The geology of southern India can be broadly divided in to the Archean Dharwar Craton (DC) of granites and greenstones belts to the north and an assembly of crustal blocks experienced granulite grade metamorphism to the south from Archean to Neoproterozoic, namely the Southern Granulite Terrain (SGT). The relationship between DC and SGT terranes are not well established, primarily due to lack of studies on the growth and evolution on each of the crustal blocks. This study focuses on the crustal tract between Salem Attur Shear Zone and the Cauvery Shear Zone of the SGT. This region lies to the east of Palghat Cauvery Shear System, which is considered as dextral shear zone, suture zone, Neoproterozoic terrain boundary and reworked Archean crust in the previous studies. However, so far no comprehensive studies had been reported from the region that consists of a spectrum of rocks charnockite, granitic gneiss, hornblende gneiss, granite and mafic-ultramafics litho-units inclusive of a layered complex. The objectives of this study are 1) to understand the crustal formation processes in Kolli-massif 2) to delineate the chronology of events or processes through radiometric dating. 3) to understand the crustal reworking and evolutionary processes in Kolli-massif . Major tools used in this study include petrology (field studies and petrography), geochemistry, U-Pb Zircon geochronology, Sr-Nd and Hf Isotopes. The content of this thesis is divided in to six chapters. Chapter 1 is an introduction to the topic – crustal growth. It discusses the importance of continental crustal process in understanding the evolutionary history of the 2500 Ma Earth. It also emphasizes on the reason to investigate Kolli-massif which is a part of the Southern Granulite Terrain. Chapter 2 deals with the literature review which is relevant in the context of the study. The chapter discusses topics like structure of the Earth crust, various models proposed on the generation of continental crust (continuous as well as episodic) and also the models discussed in the literature on the generation of TTG (subduction of oceanic crust and ocean plateau and non-subduction). An overall view on crustal reworking and recycling is also included. The chapter ends with a short review on southern Indian crustal tectonics and a detailed discussion on the evolution Palghat Cauvery Shear Zone. Chapter 3 describes the geology of the study area Kolli-massif in details. This includes the structural, lithological units, field relation and geochronolgical aspects combined and their implications on the crustal assembly of southern India. Chapter 4 is a discussion on the results, interpretation and implications of crustal generation and evolution of the Archean Kolli-massif. This chapter is subdivided to four. Chapter 4.1 deals with possible source and tectonic settings for the magma generation which lead to the formation of Archean Sittampundi Complex. The whole rock and spinel chemistry two different suggests both MORB and arc signature for these rocks. Although this is such a quite contrasting scenario, such scenarios are known to occur in an intra-oceanic subduction in the Archean as well as modern analogue. The search for MOR setting lead to Kanjamalai, where major rocks like metagabbro show geochemical affinity, as described in Chapter 4.2. The presence of rocks like plagiogranite also supports MORB affinity. Based on field observations and above evidences Kanjamalai complex is interpreted as subducted remnant of an Archean Mid Oceanic Ridge. Chapter 4.3 deals with the major rock type of the region charnockite and granitic gneiss. The whole geochemical chemistry suggests arc signatures (depleted HFS elements, enriched LREE) and negative Nd and Hf isotope suggests reworked magma. However, the high HREE content and absence of Eu anomaly in the charnockite but reverse case of granitic gneiss indicates they might have of a different source and may not solely by the subduction of oceanic crust described in chapter 4.1. Combining the results from Hf and Nd isotopes that shows the presence of an older crust of age 2700-2900 Ma, it can be concluded that the an older oceanic crust, probably with an ocean plateau was part of subduction and magma genesis. The presence of garnet websterite describes accretion in operation in the generation of Kolli-massif. Chapter 4.4 deals with crustal recycling. The results on the investigation on meta-BIFs yielded results that can be interpreted that the iron formations were deeply subducted. The proposal of accretionary tectonics is also supported by the presence of meta-BIFs in the shear zone with in the Kolli-massif. Chapter 5 deals with the Neoproterozic reworking of the Archean Kolli-massif. The investigations on the sapphirine bearing granulite suggest that the rocks have undergone UHT metamorphism (6Kbar and 925˚C). The geochronogical evidences shows that the zircon rim growth ca. 550 Ma over a 2480 Ma crust. This suggests crustal reworking that would have happened during the Gondwana amalgamation happened during the Neoproterozoic time.It is therefore concluded in Chapter 6 that the Kolli-massif is having an Archean nucleus that was grown by the arc accretion. This reworked during the regional metamorphism along with the Gondwana metamorphism in the Neoproterozoic. Further scope of this study is also discussed.

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Rowe, S. E. "Mechanism of formation and age of the Ayyarmalai A-type charnockite – granite association from the south-eastern Palghat- Cauvery Shear System, southern India." Thesis, 2010. http://hdl.handle.net/2440/104030.

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The Ayyarmalai A-type charnockite and A-type alkali granite lies on the south-eastern margin of the Palghat-Cauvery Shear System and provides an example of co-magmatism that was later overprinted with granulite facies metamorphism at ~2.45-2.5Ga. The Palghat-Cauvery Shear System represents an intriguing zone with Neoproterozoic aged granulites (~800-500 Ma) to the south and Archaean granulites (~3000-2500 Ma) to the north; the origins of which are still often disputed. This study presents whole rock major and trace element compositions, mineral chemistry, pressure-temperature estimates and whole rock Sm-Nd, Rb-Sr, Pb-Pb and δ18O isotopic compositions of this A-type charnockite-granite association found at Ayyarmalai, Tamil Nadu, Southern India. The subsequent data from this study suggests that: (1) the Ayyarmalai charnockites from the Palghat-Cauvery Shear System have zircon ages that are synchronous with events in the Northern Granulite Terrain; (2) The Dharwar Craton is a strong candidate for the protolith of these rocks; (3) Evidence of a Neoproterozoic-Cambrian granulite metamorphic event (~520 Ma) appears to be absent in these rocks questioning the existence or location of a Neoproterozoic - Cambrian suture zone proposed for the Palghat-Cauvery Shear System recently. U-Pb zircon ages show zoned igneous cores ~2.65-2.68 Ga ages in both rock types defining the crystallisation age, while the large metamorphic rim overgrowths date the Archaean granulite metamorphic event at ~2.45 - 2.5 Ga. Geochemical data of the Ayyarmalai charnockites reveal a very primitive, unfractionated REE pattern with no Eu-anomaly, ferroan, high K-calc-alkaline, with moderate enrichment of LREE with respect to HREE and fall within the field of high Ba-Sr type granitoids. Extraction of Pyroxene- Hornblende rich cumulates resulted in an intermediate charnockites driving the crystallisation towards the final A-type alkali granite. The A-type alkali granites show a more fractionated REE pattern with a significant Eu-anomaly, ferroan, high-K- calc-alkaline, with enrichment of LREE and depletion in the low Ba-Sr type granitoids. εNd and Nd model ages indicate a highly evolved protolith (εNd(0) =-25.15 to -33.14) that encountered a crustal Archaean source (2.89-3.09 Ga) causing contamination as the magmas ascended. Harker diagrams, Nd data (isochron age, ~2519 Ma) and U-Pb zircon crystallisation ages suggest a co-magmatic relationship between the charnockite and alkali granite. Conventional geothermometry/barometry suggest minimum pressure-temperature conditions existed at 740 – 750°C and P=5.61 – 5.84 kbar. The data presented from this study is consistent with a magmatic origin of these charnockites favouring the early crystallisation of orthopyroxene. The correlation with the data from the Dharwar Craton suggest that the study region may have encountered Dharwar Craton on magmatic ascent causing crustal contamination
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2010

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Частини книг з теми "Southern granulite terrane"

Valdiya, K. S. "Southern Granulite Terrane of Pan-African Rejuvenation." In Society of Earth Scientists Series, 205–36. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-25029-8_7.

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Raith, M., C. Srikantappa, K. G. Ashamanjari, and B. Spiering. "The Granulite Terrane of the Nilgiri Hills (Southern India): Characterization of High-Grade Metamorphism." In Granulites and Crustal Evolution, 339–65. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2055-2_17.

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Manglik, A., S. K. Verma, K. Sain, T. Harinarayana, and V. Vijaya Rao. "Joint Inversion of Seismic and MT Data – An Example from Southern Granulite Terrain, India." In The Earth's Magnetic Interior, 83–90. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0323-0_5.

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Pruseth, K. L., V. Ravikant, S. Varghese, and R. Krishnamurthi. "Mantle-Derived Carbonate Fluid Alteration and Gold Mineralization in Southern Granulite Terrain, Wynad, India." In Dyke Swarms:Keys for Geodynamic Interpretation, 125–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-12496-9_8.

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Catlos, Elizabeth J., Kaan Sayit, Poovalingam Sivasubramanian, and Chandra S. Dubey. "Geochemical and Geochronological Data from Charnockites and Anorthosites from India’s Kodaikanal–Palani Massif, Southern Granulite Terrain, India." In Topics in Igneous Petrology, 383–417. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9600-5_15.

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Chetty, TRK. "The Southern Granulite Terrane." In Proterozoic Orogens of India, 35–117. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-804441-4.00002-x.

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Hillenbrand, Ian, Michael L. Williams, Michael J. Jercinovic, Matthew T. Heizler, and Daniel J. Tjapkes. "Petrochronologic constraints on Paleozoic tectonics in southern New England." In Laurentia: Turning Points in the Evolution of a Continent. Geological Society of America, 2022. http://dx.doi.org/10.1130/2022.1220(25).

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ABSTRACT The Appalachian Mountains were formed through multiple phases of Paleozoic orogenesis associated with terrane accretion. The timing, tempo, and significance of each event in New England are obscured by overprinting, the limits of geochronologic tools, and differences between lithotectonic domains. We present new monazite and xenotime geochronology, 40Ar/39Ar thermochronology, and major- and trace-element thermobarometry from major tectonic domains in southern New England and across multiple structural levels. These data show contrasting pressure-temperature-time (P-T-t) paths across tectonic domains and highlight eastward metamorphic overprinting associated with younger tectonic events. Our data and geochemical proxies suggest two major periods of crustal thickening, ca. 455–440 Ma and 400–380 Ma, and a heterogeneous record of thinning/exhumation. Ordovician (Taconic) crustal thickening postdates the interpreted accretion of the Moretown terrane by ~20 m.y. and may have been related to shallow subduction after subduction polarity reversal. Subsequent cooling and exhumation (440–430 Ma) may have been related to the end of the Taconic orogeny and opening of the Connecticut Valley basin. (Neo)Acadian tectonometamorphism is recognized in accreted terranes of New England and is absent in the Taconic block. Amphibolite- to (high-pressure) granulite-facies metamorphism, slow cooling, and protracted anatexis ca. 400–340 Ma support the existence of a long-lived orogenic plateau in southern New England. Exhumation, which began at 340–330 Ma, may have involved ductile (channel) flow. The boundary between continental Laurentia and accreted terranes has been reactivated at multiple times and is presently manifested as a 12–15 km Moho step. At the latitude of our samples, Alleghanian-age tectonism (ca. 310–285 Ma) was limited to retrograde metamorphism, and relatively minor loading and exhumation in the vicinity of the Pelham dome. Our results highlight the sensitivity of the integrative petrochronologic approach and the transition of the eastern margin of Laurentia from terrane accretion to the formation of a high-elevation plateau.

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Mahan, K. H., C. A. Smit, M. L. Williams, G. Dumond, and D. D. van Reenen. "Heterogeneous strain and polymetamorphism in high-grade terranes: Insight into crustal processes from the Athabasca Granulite Terrane, western Canada, and the Limpopo Complex, southern Africa." In Origin and Evolution of Precambrian High-Grade Gneiss Terranes, with Special Emphasis on the Limpopo Complex of Southern Africa. Geological Society of America, 2011. http://dx.doi.org/10.1130/2011.1207(14).

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Touret, Jacques L. R., and Jan-Marten Huizenga. "Fluids in granulites." In Origin and Evolution of Precambrian High-Grade Gneiss Terranes, with Special Emphasis on the Limpopo Complex of Southern Africa. Geological Society of America, 2011. http://dx.doi.org/10.1130/2011.1207(03).

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Perchuk, Leonid L., and Taras V. Gerya. "Formation and evolution of Precambrian granulite terranes: A gravitational redistribution model." In Origin and Evolution of Precambrian High-Grade Gneiss Terranes, with Special Emphasis on the Limpopo Complex of Southern Africa. Geological Society of America, 2011. http://dx.doi.org/10.1130/2011.1207(15).

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Тези доповідей конференцій з теми "Southern granulite terrane"

Banerjee, Meenakshi, and Upama Dutta. "GENESIS OF TWO DISTINCT TYPES OF CORONAE ASSEMBLAGES AT CLINOPYROXENE-PLAGIOCLASE CONTACT IN MAFIC DYKE FROM SOUTHERN GRANULITE TERRANE (SGT), INDIA." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-357942.

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Bauri, Sudip, Upama Dutta, Uttam K. Bhui, and Pulak Sengupta. "EXSOLUTION TEXTURES IN PYROXENES FROM METAMORPHOSED BANDED IRON FORMATION FROM PARTS OF THE SOUTHERN GRANULITE TERRANE, INDIA: EVIDENCE OF UHT METAMORPHISM DURING LATE ARCHAEAN TIME." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-284681.

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Manjari K G, Asha. "Melt Inclusion Studies in Carbonatite from Kambammettu, Southern Granulite Terrain, India." In Annual International Conference on Geological & Earth Sciences. Global Science & Technology Forum (GSTF), 2014. http://dx.doi.org/10.5176/2251-3353_geos14.32.

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Pivarunas, Anthony F., Joseph G. Meert, M. K. Pandit, and Anup K. Sinha. "AT THE BOTTOM (OF INDIA): PROTEROZOIC PALEOMAGNETISM AND GEOCHRONOLOGY OF THE SOUTHERN GRANULITE TERRAIN." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-285793.

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Meijer, Arend. "MESO-PROTEROZOIC LOWER-CRUSTAL GARNET GRANULITE, GRANULITE FACIES METASEDIMENTS, AND CHARNOCKITE, FROM THE PINAL TERRAIN OF SOUTHERN ARIZONA: IMPLICATIONS FOR THE ORIGIN OF MESO-PROTEROZOIC GRANITOIDS AND LARAMIDE COPPER PORPHYRIES." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-333080.

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Behera, Laxmidhar, B. Rajendra Prasad, and P. Koteswara Rao. "A tomographic image of upper crustal structure using P and S wave seismic refraction data in the southern granulite terrain, India." In SEG Technical Program Expanded Abstracts 2006. Society of Exploration Geophysicists, 2006. http://dx.doi.org/10.1190/1.2370219.

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