Academic literature on the topic 'Palaeoproterozoic boundary'
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Journal articles on the topic "Palaeoproterozoic boundary"
Vogel, D. C., R. S. James, and R. R. Keays. "The early tectono-magmatic evolution of the Southern Province: implications from the Agnew Intrusion, central Ontario, Canada." Canadian Journal of Earth Sciences 35, no. 7 (July 1, 1998): 854–70. http://dx.doi.org/10.1139/e98-031.
Full textRoelofse, F., H. de Bruiyn, D. Cornell, and M. Kristofferson. "Lithostratigraphy of the Palaeoproterozoic Verena Granite." South African Journal of Geology 123, no. 1 (March 1, 2020): 117–28. http://dx.doi.org/10.25131/sajg.123.0007.
Full textANDERSEN, TOM. "Age, Hf isotope and trace element signatures of detrital zircons in the Mesoproterozoic Eriksfjord sandstone, southern Greenland: are detrital zircons reliable guides to sedimentary provenance and timing of deposition?" Geological Magazine 150, no. 3 (November 16, 2012): 426–40. http://dx.doi.org/10.1017/s0016756812000623.
Full textSHEPPARD, S., T. J. GRIFFIN, I. M. TYLER, and R. W. PAGE. "High- and low-K granites and adakites at a Palaeoproterozoic plate boundary in northwestern Australia." Journal of the Geological Society 158, no. 3 (May 2001): 547–60. http://dx.doi.org/10.1144/jgs.158.3.547.
Full textLAMMINEN, JARKKO, TOM ANDERSEN, and JOHAN PETTER NYSTUEN. "Provenance and rift basin architecture of the Neoproterozoic Hedmark Basin, South Norway inferred from U–Pb ages and Lu–Hf isotopes of conglomerate clasts and detrital zircons." Geological Magazine 152, no. 1 (May 2, 2014): 80–105. http://dx.doi.org/10.1017/s0016756814000144.
Full textDICKIN, ALAN, and ROBERT NORTH. "Nd isotope mapping of the Allochthon Boundary Thrust on the shores of Georgian Bay, Ontario: significance for Grenvillian crustal structure and evolution." Geological Magazine 152, no. 6 (March 31, 2015): 993–1008. http://dx.doi.org/10.1017/s0016756815000114.
Full textZheng, Binsong, Chuanlong Mou, Renjie Zhou, Xiuping Wang, Zhaohui Xiao, and Yao Chen. "Nature and origin of the volcanic ash beds near the Permian–Triassic boundary in South China: new data and their geological implications." Geological Magazine 157, no. 4 (December 3, 2019): 677–89. http://dx.doi.org/10.1017/s001675681900133x.
Full textBoukhalfa, Zakaria, Abderrezak Bouzid, Yixian Xu, Abderrahmane Bendaoud, Bo Yang, Mohamed Hamoudi, Said Sofiane Bougchiche, et al. "Magnetotelluric investigation of the Precambrian crust and intraplate Cenozoic volcanism in the Gour Oumelalen area, Central Hoggar, South Algeria." Geophysical Journal International 223, no. 3 (September 12, 2020): 1973–86. http://dx.doi.org/10.1093/gji/ggaa432.
Full textMazur, Stanislaw, Sandra Piazolo, and G. Ian Alsop. "Structural analysis of the northern Nagssugtoqidian orogen, West Greenland: an example of complex tectonic patterns in reworked high-grade metamorphic terrains." Geological Survey of Denmark and Greenland (GEUS) Bulletin 11 (December 5, 2006): 163–78. http://dx.doi.org/10.34194/geusb.v11.4929.
Full textKorstgård, John A., Bo Møller Stensgaard, and Thorkild M. Rasmussen. "Magnetic anomalies and metamorphic boundaries in the southern Nagssugtoqidian orogen, West Greenland." Geological Survey of Denmark and Greenland (GEUS) Bulletin 11 (December 5, 2006): 179–84. http://dx.doi.org/10.34194/geusb.v11.4930.
Full textDissertations / Theses on the topic "Palaeoproterozoic boundary"
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.
Full textThe 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
Book chapters on the topic "Palaeoproterozoic boundary"
Mohanty, S. "Redox State of Atmosphere and Ocean at the Archaean-Palaeoproterozoic Boundary: A Case Study from the Sausar Belt, Central India." In Society of Earth Scientists Series, 57–77. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89698-4_4.
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