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Relevant bibliographies by topics / Meta-ultramafics

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Academic literature on the topic 'Meta-ultramafics'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Meta-ultramafics"

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Ramos, Rodrigo Chaves, and Edinei Koester. "Lithogeochemistry of the meta-igneous units from Arroio Grande Ophiolitic Complex, southernmost Brazil." Brazilian Journal of Geology 45, no. 1 (2015): 65–78. http://dx.doi.org/10.1590/23174889201500010005.

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Ophiolites are defined as slices of genetically-related upper mantle serpentinized peridotites and oceanic crustal rocks, tectonically displaced from its primary igneous origin of formation by plate convergence and associated (meta) sedimentary rocks of marine origin. From this premise, a meta-ultramafic-mafic-sedimentary complex (Cr-rich magnesian schists - upper mantle or crustal ultramafic cumulate candidates; epidote amphibolites, metadiorites and metagabbros - oceanic crust candidates; metasedimentary schists, quartzites and marbles - marine sedimentary rocks candidates), located in south

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Peres, Guilherme G., Fernando F. Alkimim, and Hanna Jordt-Evangelista. "The southern Araçuaí belt and the Dom Silvério Group: geologic architecture and tectonic significance." Anais da Academia Brasileira de Ciências 76, no. 4 (2004): 771–90. http://dx.doi.org/10.1590/s0001-37652004000400011.

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The Araçuaí belt corresponds to the external portion of the western half of the Araçuaí-West Congo Neopro-terozoic orogen. TheAraçuaí belt fringes the São Francisco craton to east and is separated from the crystalline core of the orogen by the Abre Campo geophysical discontinuity. The southern Araçuaí belt involves four major lithologic units: the Archean and Paleoproterozoic gneisses of the Mantiqueira Complex, the Pedra Dourada Charnockite, the Paleoproterozoic Borrachudos Granitoid, and the metavolcanosedimentary rocks of the Dom Silvério Group. The Dom Silvério Group occurs in a NNE-SSW st

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3

Rossetti, P., G. D. Gatta, V. Diella, S. Carbonin, A. Della Giusta, and A. Ferrario. "The magnetite ore districts of the southern Aosta Valley (Western Alps, Italy): a mineralogical study of metasomatized chromite ore." Mineralogical Magazine 73, no. 5 (2009): 737–51. http://dx.doi.org/10.1180/minmag.2009.073.5.737.

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AbstractIn the southern Aosta Valley (Italian Western Alps), several massive magnetite bodies occur within serpentinized ultramafic rocks belonging to the Mesozoic meta-ophiolite nappe. The ultramafic rocks consist of lherzolite with minor dunite bodies and show a high pressure metamorphic overprint. The results of a multi-methodological study, based on optical microscopy, electron microprobe analysis and single-crystal X-ray diffraction, are reported here in order to give new insights into (1) the mineralogy and crystal chemistry of spinels and silicates and (2) the genesis of the massive mag

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4

HAJIALIOGHLI, ROBAB, MOHSSEN MOAZZEN, AHMAD JAHANGIRI, ROLAND OBERHÄNSLI, BEATE MOCEK, and UWE ALTENBERGER. "Petrogenesis and tectonic evolution of metaluminous sub-alkaline granitoids from the Takab Complex, NW Iran." Geological Magazine 148, no. 2 (2010): 250–68. http://dx.doi.org/10.1017/s0016756810000683.

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AbstractThe Takab complex is composed of a variety of metamorphic rocks including amphibolites, metapelites, mafic granulites, migmatites and meta-ultramafics, which are intruded by the granitoid. The granitoid magmatic activity occurred in relation to the subduction of the Neo-Tethys oceanic crust beneath the Iranian crust during Tertiary times. The granitoids are mainly granodiorite, quartz monzodiorite, monzonite and quartz diorite. Chemically, the magmatic rocks are characterized by ASI<1.04, AI<0.87 and high contents of CaO (up to ~14.5 wt%), which are consistent with the I-type mag

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5

Katzir, Yaron, Alan Matthews, Zvi Garfunkel, Manfred Schliestedt, and Dov Avigad. "The tectono-metamorphic evolution of a dismembered ophiolite (Tinos, Cyclades, Greece)." Geological Magazine 133, no. 3 (1996): 237–54. http://dx.doi.org/10.1017/s0016756800008992.

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AbstractThe six exposures of the Upper tectonic Unit of the Cycladic Massif occurring on the island of Tinos are shown to comprise a metamorphosed dismembered ophiolite complex. The common stratigraphic section consisting of tens-of-metres- thick tectonic slices of mafic phyllites overlain by serpentinites and gabbros is considered to have been derived by a combination of thrusting during obduction and subsequent attenuation by low-angle normal faults. All rock types show evidence of a phase of regional greenschist-facies metamorphism, which in the case of the phyllites is accompanied by penet

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Dissertations / Theses on the topic "Meta-ultramafics"

1

Ramos, Rodrigo Chaves. "Complexo ofiolítico Arroio Grande, sudeste do Escudo Sul-Rio-Grandense: caracterização e discussões das unidades ortoderivadas." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/94680.

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O presente trabalho é a continuação das pesquisas anteriores relacionadas às rochas metamáficas e metaultramáficas da região de Arroio Grande, sudeste do Escudo Sul-rio-grandense. A partir de estudos de campo, microscopia óptica, microscopia eletrônica de varredura e difratometria de raios X, essa associação de rochas (anfibolitos, serpentinitos cromíferos, xistos magnesianos, micaxistos, quartzitos e mármores) foi interpretada como possíveis fragmentos de crosta oceânica relacionados ao encerramento de um paleo-oceano durante o ciclo orogênico Brasiliano/Pan-Africano no Neoproterozoico e deno

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