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Journal articles on the topic 'Gabros'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Timich, Marco, Rogério Guitarrari Azzone, Gaston Eduardo Enrich Rojas, Saulo Vieira da Silva Filho, Excelso Ruberti, and Celso De Barros Gomes. "Relações de contato entre rochas alcalinas máficas e sieníticas na Praia do Jabaquara, setor norte da Ilha de São Sebastião, SP." Geologia USP. Série Científica 19, no. 4 (2019): 3–22. http://dx.doi.org/10.11606/issn.2316-9095.v19-157121.

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Relações de contato entre as rochas sieníticas do stock de Serraria e as rochas máficas plutônicas e hipoabissais do setor norte da suíte alcalina da Ilha de São Sebastião (Ilhabela) são descritas pela primeira vez, permitindo a indicação de relações temporais entre diferentes pulsos magmáticos. Os afloramentos apresentam variedade sienítica hololeucocrática hospedando mega-, macro- e microxenólitos de diferentes rochas, formando agmatitos. Cinco unidades principais são descritas: álcali feldspato sienitos, melassienitos, diabásios, cumulatos máficos (melagabros/clinopiroxenitos) e gabros hete

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Chương, Văn Đức, Trần Văn Thắng, Văn Đức Tùng, Phan Doãn Linh, and Lê Triều Việt. "Ophiolit zone of Thai Nguyen - Cao Bang." VIETNAM JOURNAL OF EARTH SCIENCES 25, no. 2 (2018): 142–49. http://dx.doi.org/10.15625/0866-7187/25/2/11895.

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Ophiolit zone of Thai Nguyen - Cao Bang started from the border of Vietnam with China, then stretched in passing Cao Bang - Dong Khe - SacCan - to Thai Nguyen. The structure of the ophiolit zone devided into five complex :- Dunite - serpentinit - peridotite complex,- Folliation gabros complex,- Gabros - diabaz complex, ·- Bazan toleit complex,- Sediment of marginal complex.The formation of Ophiolit zone occurred in the beginingPermi and ending in the late of Triassis by overslip of Eurasian plate over Song Hien marginal sea.

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MOREIRA, César Augusto, Alice Marques PEREIRA, and Mara Lia Dias CAVALHEIRO. "Caracterização geoelétrica do gabro Santa Catarina, São Sepé (RS)." Pesquisas em Geociências 41, no. 1 (2014): 15. http://dx.doi.org/10.22456/1807-9806.78029.

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Os métodos geofísicos são largamente empregados na pesquisa dos mais diversos tipos de depó- sitos minerais. Quando combinados com estudos diretos como geoquímica em amostras de solos ou rochas, possibilitam um aumento substancial na probabilidade de descoberta de jazimentos. Os métodos geofísicos elétricos são particularmente promissores em estudos voltados à busca de sulfetos devido ao contraste das propriedades físicas resistividade elétrica e cargabilidade. Este trabalho apresenta os resultados da aplica- ção dos métodos eletrorresistividade e polarização induzida, por meio da técnica de c

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Pereira, Fabio Santos, Maria de Lourdes da Silva Rosa, and Herbet Conceição. "Condições de colocação do magmatismo máfico do Domínio Macururé, Sistema Orogênico Sergipano: Maciço Capela." Geologia USP. Série Científica 19, no. 3 (2019): 3–29. http://dx.doi.org/10.11606/issn.2316-9095.v19-151464.

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O Maciço Capela é intrusivo nas rochas metassedimentares do Domínio Macururé, Sistema Orogênico Sergipano, no sul da Província Borborema. Ele é constituído por dioritos, hornblenditos, gabros e granitos, que hospedam enclaves tonalíticos e hornblendíticos. As formas e os contatos dos enclaves tonalíticos, aliados à presença de texturas de zoneamento inverso e oscilatório em cristais de plagioclásio e ao hábito acicular da apatita nos enclaves e dioritos sugerem coexistência de magmas máfico e félsico. Os piroxênios identificados nos gabros apresentam composições de enstatita, augita e diopsídi

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DAMASCENO, Fábio Bezerra, Carlos Dinges MARQUES DE SÁ, Bruno Luiz Leite MARTINS, Danilo dos Santos BARRETO, and Luan Kellvin Canuto da MOTA. "SULFETOS DO COMPLEXO GABRÓICO CANINDÉ, SISTEMA OROGÊNICO SERGIPANO." Geosciences = Geociências 39, no. 03 (2020): 675–83. http://dx.doi.org/10.5016/geociencias.v39i03.14528.

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O Domínio Canindé, localizado na porção norte do Sistema Orogênico Sergipano, é composto por rochas metavulcânicas e metassedimentares do Complexo Canindé, sendo estas intrudidas pelo corpo gabroico denominado Complexo Gabroico Canindé. A ocorrência de mineralizações sulfetadas de Cu-Ni nos gabros já foi documentada anteriormente e será detalhada neste trabalho no que se refere à sua mineralogia e mineraloquímica, através de utilização microscopia óptica de transmissão e reflexão, de microssonda eletrônica e microscopia eletrônica de varredura. Análises por estes métodos microanalíticos permit

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Godoy, Antonio Misson, Otávio Augusto Ruiz Paccola Vieira, Larissa Marques Barbosa de Araújo, George Luiz Luvizotto, and Jefferson Cassu Manzano. "Ocorrência de Fe-Ti-V associado ao Magmatismo Gabro-Anortosítico da Serra da Alegria, Maciço Rio Apa, Mato Grosso do Sul." Geologia USP. Série Científica 20, no. 2 (2020): 19–38. http://dx.doi.org/10.11606/issn.2316-9095.v20-148783.

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O Maciço Rio Apa constitui exposições de rochas paleoproterozoicas na porção extremo sul do Cráton Amazônico. A região é constituída por rochas do Complexo Rio Apa, Grupo Alto Tererê e pelo Grupo Amonguijá, formado pelas suítes Vulcânica Serra da Bocaina e Plutônica do Batólito Alumiador. O segmento norte do batólito é caracterizado por rochas ácidas-básicas da Serra da Alegria, ocorrendo, na parte central, rochas da Sequência Magmática Ácida-Intermediária, representadas pelo granito homônimo. No seu entorno, no sopé das escarpas, aflora a Sequência Magmática Gabro-Anortosítica da Serra da Ale

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De Jesus Rosa, Lauro Roberto, Adriane Machado, Cristine Lenz, Luciana Oliveira dos Santos, and Lucas Santana Menezes. "Análise multiespacial para mapeamento geológico: estudo de caso no corpo gabróico-granítico, Faixa de Dobramentos Sergipana / Multispacial analytics to geological mapping: case study at gabroic-granitic body, Sergipano Fold Belt." Caderno de Geografia 28, no. 53 (2018): 337–61. http://dx.doi.org/10.5752/p.2318-2962.2018v28n53p337-361.

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Novos dados geológicos foram obtidos em um corpo gabróico-granítico na Faixa de Dobramentos Sergipana (Capela, SE), utilizando as técnicas de sensoriamento remoto e geoprocessamento integradas, em uma escala de semi-detalhe (1: 30.000). Esse corpo é constituído de um conjunto de rochas ígneas, compostas principalmente por gabros, ocorrendo ainda quartzo-dioritos e granodioritos. Nesse estudo, foram utilizados dados de magnetometria, de imagens de satélite Landsat 8 e dados TOPODATA, geoprocessados no software Quantum Gis. As informações obtidas, associadas a dados de trabalhos de campo, permit

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De Sousa, Flavio Alves. "IDENTIFICAÇÃO DAS ZONAS DE RECARGA E CARACTERIZAÇÃO DOS SISTEMAS FREÁTICOS DE IPORÁ - GO." Geoambiente On-line, no. 33 (May 25, 2019): 23. http://dx.doi.org/10.5216/revgeoamb.v0i33.52073.

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– Neste trabalho foram mapeadas as áreas de recarga do lençol freático no município de Iporá, bem como as características como litologia, tipo de solos e ocupação das terras. Foi desenvolvido através de diversas frentes, como: mapeamento e identificação das áreas de recarga através de imagem de satélite e uso de software de geoprocessamento; caracterização dos tipos de solos relacionados às zonas de recarga; medição da condutividade hidráulica dos solos nas zonas de recarga; caracterização do sistema freático e utilização de cálculos para estimativa de recarga, reserva permanente e reserva exp

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9

Hernandez, Ciria C., Wenshu XiangWei, Ningning Hu, et al. "Altered inhibitory synapses in de novo GABRA5 and GABRA1 mutations associated with early onset epileptic encephalopathies." Brain 142, no. 7 (2019): 1938–54. http://dx.doi.org/10.1093/brain/awz123.

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Abstract We performed next generation sequencing on 1696 patients with epilepsy and intellectual disability using a gene panel with 480 epilepsy-related genes including all GABAA receptor subunit genes (GABRs), and we identified six de novo GABR mutations, two novel GABRA5 mutations (c.880G>T, p.V294F and c.1238C>T, p.S413F), two novel GABRA1 mutations (c.778C>T, p.P260S and c.887T>C, p.L296S/c.944G>T, p.W315L) and two known GABRA1 mutations (c.335G>A, p.R112Q and c.343A>G, p.N115D) in six patients with intractable early onset epileptic encephalopathy. The α5(V294F and S41

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Rosa, Lauro Roberto de Jesus. "Uso de geotecnologias para redefinição do Corpo Gabróico-Granítico Capela, Orógeno Sergipano / Geotecnologies for the redefinition of Gabbroic-Granitic Body Capela, Sergipano Orogeny." Caderno de Geografia 29, no. 57 (2019): 609–27. http://dx.doi.org/10.5752/p.2318-2962.2019v29n57p609-627.

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Com o advento de novas tecnologias, a geologia avançou em seu conhecimento. E técnicas de sensoriamento remoto como magnetometria, imagens de satélite Landsat 8 e dados TOPODATA, que são geoprocessados em diferentes softwares como o Quantum Gis permitiram a redefinição de novos limites geológicos na região de Capela, Sergipe. Essas informações, associadas aos dados de trabalhos de campo, permitiram a identificação de novas litologias e estruturas, o que levou a uma melhor delimitação do pluton em questão e a obtenção de um novo mapa geológico da região estudada. Este corpo abrange uma sucessão

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Tribuzio, R., G. Manatschal, M. R. Renna, L. Ottolini, and A. Zanetti. "Tectono-magmatic Interplay and Related Metasomatism in Gabbros of the Chenaillet Ophiolite (Western Alps)." Journal of Petrology 60, no. 12 (2019): 2483–508. http://dx.doi.org/10.1093/petrology/egaa015.

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Abstract The Jurassic Chenaillet ophiolite in the Western Alps consists of a gabbro–mantle association exhumed to the seafloor through detachment faulting and partly covered by basaltic lavas. One of the Chenaillet gabbroic bodies includes mylonites that are transected by a network of felsic veins, thereby testifying to the interplay of ductile shearing and magma emplacement. The deformed gabbros preserve clinopyroxene porphyroclasts of primary magmatic origin, which are typically mantled by amphibole (titanian edenite) and minor secondary clinopyroxene. Titanian edenite and secondary clinopyr

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12

Santos, Renata Barrêto, Thaíse Maria Fontes Kálix, Felisbela Maria Costa Oliveira, Evenildo Bezerra de Melo, Suely Andrade da Silva, and Márcio Luiz Siqueira Campos Barros. "CARACTERÍSTICAS PETROGRÁFICAS DE ROCHAS ESCURAS E SUA CORRESPONDÊNCIA COM ALTERABILIDADE, RESISTÊNCIAS E ÍNDICES FÍSICOS; EXEMPLO DO PRETO SÃO MARCOS." HOLOS 3 (July 3, 2014): 20. http://dx.doi.org/10.15628/holos.2014.1805.

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As rochas silicáticas escuras, como os gabros, cuja composição apresenta mais plagioclásios e minerais ferromagnesianos, sobretudo piroxênios, anfibólios e micas, mostram maior tendência à alteração, seja em meio anidro (oxidação), seja em meio aquoso, através da hidratação. Rochas escuras sofrem limitações para aplicação, seja em ambientes úmidos ou secos, graças à susceptibilidade às alterações. A grande quantidade de rejeitos poderá ser minorada através da melhor adequação da explotação (extração das pranchas e blocos) aos elementos marcadores de deformação. Assim, é necessária a análise pr

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13

Pehrsson, Sally, Simon Hanmer, and Otto van Breemen. "U–Pb geochronology of the Raglan gabbro belt, Central Metasedimentary Belt, Ontario: implications for an ensialic marginal basin in the Grenville Orogen." Canadian Journal of Earth Sciences 33, no. 5 (1996): 691–702. http://dx.doi.org/10.1139/e96-052.

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The Raglan gabbro belt of the Ontario Grenville Orogen is coincident with the top of the Central Metasedimentary Belt boundary thrust zone, a major mid-crustal shear zone separating the Central Gneiss Belt in the footwall from the Central Metasedimentary Belt in the hanging wall. It has been suggested that the gabbros making up the belt are coeval, that they formed in a marginal basin within the Central Metasedimentary Belt, and that they formed a horizon of Theologically stiff material that controlled the localization of the top of the boundary thrust zone during its initiation as the margina

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RAY, DWIJESH, SAUMITRA MISRA, RANADIP BANERJEE, and DOMINIQUE WEIS. "Geochemical implications of gabbro from the slow-spreading Northern Central Indian Ocean Ridge, Indian Ocean." Geological Magazine 148, no. 3 (2010): 404–22. http://dx.doi.org/10.1017/s001675681000083x.

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AbstractGabbro samples (c. < 0.4 Ma old) dredged from close to the ‘Vityaz Megamullion’ on the slow-spreading Northern Central Indian Ridge (NCIR, 18–22 mm yr−1) include mostly olivine gabbro and Fe–Ti oxide gabbro. The cumulate olivine gabbro shows ophitic to subophitic texture with early formed plagioclase crystals in mutual contact with each other, and a narrow range of compositions of olivine (Fo80–81), clinopyroxene (magnesium number: 85–87) and plagioclase (An67–70). This olivine gabbro could be geochemically cogenetic with the evolved oxide gabbro. These gabbro samples are geochemica

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Nguyen, Du, Tomoaki Morishita, Yusuke Soda, et al. "Occurrence of Felsic Rocks in Oceanic Gabbros from IODP Hole U1473A: Implications for Evolved Melt Migration in the Lower Oceanic Crust." Minerals 8, no. 12 (2018): 583. http://dx.doi.org/10.3390/min8120583.

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Felsic rocks are minor in abundance but occur ubiquitously in International Ocean Discovery Program Hole U1473A, Southwest Indian Ridge. The trace element abundances of high-Ti brown amphibole, plagioclase, and zircon in veins, as well as the presence of myrmekitic texture in the studied felsic rocks support crystallization origin from highly-evolved melts, probably controlled by fractional crystallization. Based on geochemical criteria and texture of the mineral assemblage in felsic rocks and their relationship with host gabbros, they can be divided into three types: (1) Felsic rock with shar

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LI, ZHEN, JIAN-SHENG QIU, and XI-SHENG XU. "Geochronological, geochemical and Sr–Nd–Hf isotopic constraints on petrogenesis of Late Mesozoic gabbro–granite complexes on the southeast coast of Fujian, South China: insights into a depleted mantle source region and crust–mantle interactions." Geological Magazine 149, no. 3 (2011): 459–82. http://dx.doi.org/10.1017/s0016756811000793.

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AbstractThe Quanzhou (QZ) and Huacuo (HC) gabbro–granite complexes on the southeast coast of Fujian, South China, are important components of a Late Mesozoic calc-alkaline volcanic–plutonic belt in the region. The complexes provide an excellent opportunity to investigate the genetic relationships between acid and basic magmas, and their interactions within the intrusive environment. The complexes are composed mainly of monzogranite and biotite granodiorite in the QZ complex, and biotite granite in the HC complex, with lesser amounts of hornblende gabbro. Zircon U–Pb dating provides consistent

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BERNSTEIN, STEFAN, and DENNIS K. BIRD. "Formation of wehrlites through dehydration of metabasalt xenoliths in layered gabbros of the Noe-Nygaard Intrusion, Southeast Greenland." Geological Magazine 137, no. 2 (2000): 109–28. http://dx.doi.org/10.1017/s0016756800003794.

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The Noe-Nygaard Intrusion is a 4 × 2.5 km stock composed of layered gabbros and wehrlites within the Precambrian basement of the coastal mountains west of the Kialineq Plutonic Complex. Transgressive relationships to Tertiary mafic dykes and the occurrence of abundant metabasaltic xenoliths signify a Tertiary age for the intrusion. The intrusion is characterized by alternating zones of gabbro and wehrlite; gabbro is both intruded and replaced by wehrlite, and the wehrlite zones are characterized by abundant metabasaltic xenoliths. Based on 87Sr/86Sr ratios, mica, olivine and oxide gabbros are

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Akamatsu, Yuya, Kumpei Nagase, and Ikuo Katayama. "Non-Dilatant Brittle Deformation and Strength Reduction of Olivine Gabbro due to Hydration." Minerals 11, no. 7 (2021): 694. http://dx.doi.org/10.3390/min11070694.

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To investigate the influence of hydration on brittle deformation of oceanic crustal rocks, we conducted triaxial deformation experiments on gabbroic rocks with various degrees of hydration at a confining pressure of 20 MPa and room temperature, measuring elastic wave velocity. Hydrated olivine gabbros reached a maximum differential stress of 225–350 MPa, which was considerably less than those recorded for gabbros (~450 MPa), but comparable to those for serpentinized ultramafic rocks (250–300 MPa). Elastic wave velocities of hydrated olivine gabbros did not show a marked decrease even prior to

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Paschoalin Filho, João Alexandre, Diego Gonçalves Camelo, David de Carvalho, António José Guerner Dias, and Brenno Augusto Marcondes Versolatto. "Use of construction and demolition solid wastes for basket gabion filling." Waste Management & Research: The Journal for a Sustainable Circular Economy 38, no. 12 (2020): 1321–30. http://dx.doi.org/10.1177/0734242x20922591.

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Construction and demolition wastes have been studied by technical means aiming at the development of management tools to reduce their environmental impacts. Among these, recycling can be highlighted. This paper aims at the technical assessment of basket gabions filled with construction and demolition solid waste. Gabions are usually used for retaining walls construction, and these are commonly filled with rocks. Retaining walls are essential for earthfill slopes stabilization, and they must have proper characteristics of strength. However, depending on the slope height or the technical respons

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JAFARI, MORTEZA KHALATBARI, HASSAN A. BABAIE, and MOJTABA MIRZAIE. "Geology, petrology and tectonomagmatic evolution of the plutonic crustal rocks of the Sabzevar ophiolite, NE Iran." Geological Magazine 150, no. 5 (2013): 862–84. http://dx.doi.org/10.1017/s0016756812000933.

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AbstractThe plutonic crustal sequence exposed northeast of Sabzevar is part of the ophiolitic belt of Sabzevar that occurs along the northern margin of the Central Iran micro-continent. The sequence includes olivine and pyroxene gabbro with cumulate characteristics, isotropic gabbro, foliated gabbro and a diabase sheeted dyke complex cut by wehrlite and olivine websterite intrusions, and pegmatite gabbro and plagiogranite as small intrusions and dykes. The sequence is comparable to gabbros in known ophiolite complexes. Microscopic studies show an abundance of the mesocumulate and heteradcumula

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Bernstein, Stefan, Minik T. Rosing, C. Kent Brooks, and Dennis K. Bird. "An ocean-ridge type magma chamber at a passive volcanic, continental margin: the Kap Edvard Holm layered gabbro complex, East Greenland." Geological Magazine 129, no. 4 (1992): 437–56. http://dx.doi.org/10.1017/s001675680001952x.

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AbstractThe gabbros of the Tertiary Kap Edvard Holm Layered Serieshave a stratigraphic thickness of more than 5000 m. Earlier work has shown that the range in cumulus mineral compositions is restricted (plagioclase An81—An51; olivine Fo85—Fo66; pyroxenes Ca43Mg46Fe11 to Ca43Mg37Fe20). Field evidence of magma injections is common, which together with the restricted range in mineral chemistry suggests that the magma chamber was frequently replenished by a less fractionated magma. A detailed study of a 600 m section (900–1500 m) in the Lower Layered Series reveals a period of crystallization when

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Bevins, R. E., G. J. Lees, R. A. Roach, G. Rowbotham, and P. A. Floyd. "Petrogenesis of the St David's Head Layered Intrusion, Wales: a complex history of multiple magma injection and in situ crystallisation." Transactions of the Royal Society of Edinburgh: Earth Sciences 85, no. 2 (1994): 91–121. http://dx.doi.org/10.1017/s0263593300003515.

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AbstractThe St David's Head Intrusion, exposed in North Pembrokeshire, is a tholeiitic sill up to 570 m thick, comprising principally mafic gabbros, which are in part layered. Layering varies from the centimetre to the metre scale. A range of gabbroic compositions is present, defining seven major petrological types, which are cut by thin silicic (aplitic) veins.Log–log plots of incompatible elements from the various lithological units indicate that all of the rocks in the intrusion are petrogenetically linked, although a variety of processes has been operative. Roach (1969) considered the quar

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Lamerdonov, Z. G., T. Yu Khashirova, S. A. Zhaboev, M. A. Enaldieva, A. M. Chochieva, and K. Z. Lamerdonov. "Operational Experience of Gabion Shore Protection Structures on Mountain Rivers and Some Suggestions for their Improvement." Ecology and Industry of Russia 24, no. 10 (2020): 8–12. http://dx.doi.org/10.18412/1816-0395-2020-10-8-12.

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The paper presents the accumulated experience in the construction and operation of gabions. The results of field surveys of gabions, their advantages and disadvantages, which must be taken into account in environmental practice, are presented. Innovative developments of sloping fasteners made of semi-cylindrical gabions and their construction technologies are presented. Variants of flexible retaining walls of semi-cylindrical gabions are proposed, with lower specific pressures on the soil of the base and enhanced bearing capacity on the action of bending moments. Experimental studies of prisma

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Clarke, Sam, Andrew Barr, Jim Warren, and Angus Williams. "Local variations in gabion structures." International Journal of Protective Structures 9, no. 4 (2018): 415–31. http://dx.doi.org/10.1177/2041419618766153.

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Gabion structures are widely used for force protection as they enable locally available material to be used, reducing logistical expense. The soil fill within these structures provides the blast and ballistic resistance; hence, any localised variation in the contained soil can potentially lead to reductions in protective capability. Specifically, built gabion structures were monitored in internal and external environments to assess the variation of soil moisture content and density over a full year and with changing weather conditions. The gabions were filled with fine sand according to manufa

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Adilov, Farkhadjan, and Rustam Abirov. "On numerical investigation of stability of roadbeds reinforced by gabion structures." E3S Web of Conferences 264 (2021): 02004. http://dx.doi.org/10.1051/e3sconf/202126402004.

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The stability of roadbed in seismic prone areas is vital for the sustainable economic development of regions. The gabion structures are one of the methods of road strengthening. Gabion structures are used to avoid damage to the roadbed under loads of natural ground slope due to earthquake or other reasons. This approach is one of the most economical and efficient solutions for the stabilization of natural ground slopes, and it is efficient as a drainage system. Field tests give precise results about the efficiency of gabion types for different sites. However, in some cases, it is expensive and

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Taher, Ratna, Makruf Nurudin, and Eko Hanudin. "Characteristics of Soils Developing from Gabbro, Phyllite and Chert Parent Rock in Karangsambung District." Ilmu Pertanian (Agricultural Science) 4, no. 3 (2019): 131. http://dx.doi.org/10.22146/ipas.32392.

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Understanding the nature of the soil is very important to know the potential and the proper management of the soil. This study aimed to determine the differences in morphological, physical, and chemical properties of the soils developing from gabbro, phylitte and chert parent materials. The soil profile was made to represent each parent rock of gabbro, phyllite and chert located on the upper and middle slopes with pine-dominated vegetation and mixed gardens. Observation in the field is a professional description to observe soil morphology. Soil samples were taken at each horizon to analyze soi

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Glykys, Joseph, та Istvan Mody. "Hippocampal Network Hyperactivity After Selective Reduction of Tonic Inhibition in GABAA Receptor α5 Subunit–Deficient Mice". Journal of Neurophysiology 95, № 5 (2006): 2796–807. http://dx.doi.org/10.1152/jn.01122.2005.

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Functionally, γ-aminobutyric acid receptor (GABAR)–mediated inhibition can be classified as phasic (synaptic) and tonic (extrasynaptic). The GABARs underlying tonic inhibition assemble from subunits different from those responsible for phasic inhibition. We wanted to assess the excitability of hippocampal pyramidal cell (PC) networks following a selective impairment of tonic inhibition. This is difficult to accomplish by pharmacological means. Because the GABAR α5 subunits mostly mediate the tonic inhibition in CA1 and CA3 PCs, we quantified changes in tonic inhibition and examined network exc

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Lindsay, Jordan J., Hannah S. R. Hughes, Dermot Smyth, Iain McDonald, Adrian J. Boyce, and Jens C. Ø. Andersen. "Distinct sulfur saturation histories within the Palaeogene Magilligan Sill, Northern Ireland: implications for Ni – Cu – platinum group element mineralisation in the North Atlantic Igneous Province." Canadian Journal of Earth Sciences 56, no. 7 (2019): 774–89. http://dx.doi.org/10.1139/cjes-2018-0141.

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The ∼60 m thick Magilligan Sill is part of the British Palaeogene Igneous Province in the North Atlantic. The sill comprises layers of dolerite and olivine gabbro, and it intrudes a thick sequence of Mesozoic mudstones and marls, which are locally baked at the sill margins. Since 2014, the sill has been an exploration target for orthomagmatic Ni – Cu – platinum group element (PGE) sulfide mineralisation analogous to the Noril’sk-Talnakh intrusion in Russia. We present new petrological, geochemical, and S isotope data to assess the prospectivity of the sill and the underlying magmatic plumbing

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Pe-Piper, Georgia, David J. W. Piper, and Basilios Tsikouras. "The late Neoproterozoic Frog Lake hornblende gabbro pluton, Avalon Terrane of Nova Scotia: evidence for the origins of appinites." Canadian Journal of Earth Sciences 47, no. 2 (2010): 103–20. http://dx.doi.org/10.1139/e09-077.

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The late Neoproterozoic Frog Lake pluton, in the Avalon terrane of the Cobequid Highlands, Nova Scotia, consists predominantly of hornblende gabbro. It shows petrographic similarities to water-rich mafic intrusions known as appinites that are present in some collisional orogens. This study aims to further understanding of the origin of appinitic intrusions. In the field, the main hornblende gabbro was intruded between screens of metasedimentary country rock that is of upper greenschist metamorphic grade. The contacts appear to have been pathways for magma of gabbroic, tonalitic–granodioritic,

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Klassen, H. D., and T. G. Northcote. "Stream bed configuration and stability following gabion weir placement to enhance salmonid production in a logged watershed subject to debris torrents." Canadian Journal of Forest Research 16, no. 2 (1986): 197–203. http://dx.doi.org/10.1139/x86-036.

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Tandem V-shaped gabion weirs for improving spawning habitat for salmon (Oncorhynchus spp.) were installed to replace large organic debris at three sites below the terminus of a debris torrent in Sachs Creek, Queen Charlotte Islands. Stream conditions were compared between gabion and nearby control sites. The stability of added and entrapped gravel at all gabion sites was poor over the first winter and excessive scour threatened the integrity of the upstream steeper (3%) slope gabion site. However, the two gabion sites at a lower (1%) slope successfully stabilized spawning gravel in the 2nd yea

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Hassanipak, A. A., A. Mohamad Ghazi, and J. M. Wampler. "Rare earth element characteristics and K–Ar ages of the Band Ziarat ophiolite complex, southeastern Iran." Canadian Journal of Earth Sciences 33, no. 11 (1996): 1534–42. http://dx.doi.org/10.1139/e96-116.

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The Band Ziarat complex of southeastern Iran is located on the western boundary of the Jaz Murian depression and is bounded by two major fault systems. The principal rock units of this complex are a gabbro sequence that includes low-and high-level cumulate gabbros, a late intrusive sequence that consists of diorite and plagiogranite, and a volcanic sequence that includes diabase dikes and a lesser amount of basaltic lava. Mantle rocks are virtually absent because of the presence of the two bounding fault systems, but we consider the complex to be an ophiolite in nature. Rare earth element (REE

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Pimentel, Márcio M., Maria Helena B. M. Hollanda, and Richard Armstrong. "Shrimp U-Pb age and Sr-Nd isotopes of the Morro do Baú mafic intrusion: implications for the evolution of the Arenópolis volcano-sedimentary sequence, Goiás Magmatic Arc." Anais da Academia Brasileira de Ciências 75, no. 3 (2003): 331–39. http://dx.doi.org/10.1590/s0001-37652003000300006.

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The Arenópolis volcano-sedimentary sequence is located in the southern part of the Goiás Magmatic Arc and includes a ca. 900 Ma calc-alkaline arc sequence made of volcanic rocks ranging in composition from basalts to rhyolites, metamorphosed under greenschist to amphibolite facies. Small calc-alkaline gabbro to granite sub-volcanic bodies are also recognized. The Morro do Baú intrusion is the largest of these intrusions, and is made of gabbros and diorites. Zircon grains separated from one gabbro sample and analyzed by SHRIMP I yielded the mean 206Pb/238U age of 890 +/- 8 Ma, indicating that t

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Tegner, Christian, and J. Richard Wilson. "A late ultramafic suite in the Kap Edvard Holm layered gabbro complex, East Greenland." Geological Magazine 130, no. 4 (1993): 431–42. http://dx.doi.org/10.1017/s0016756800020513.

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AbstractThe Kap Edvard Holm Complex is an early Tertiary layered gabbro situated on the western side of the Kangerdlugssuaq fjord. Layered olivine gabbros in the Taco Point area are cut by several wehrlitic sill-like bodies which comprise a late ultramafic suite. An intrusive wehrlitic facies in the inner part of the bodies consists of olivine (+minor chrome-spinel) orthocumulate with clinopyroxene oikocrysts and interstitial plagioclase, kaersutite and phlogopite. A replacive facies which occurs in the marginal zones is texturally similar to the intrusive facies but contains no chromespinel a

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Artemenko, G. V., and V. I. Ganotskiy. "Gabbroides of Peterman island (West Antarctica). First information on geochemistry." Arctic and Antarctic Research 65, no. 4 (2019): 449–61. http://dx.doi.org/10.30758/0555-2648-2019-65-4-449-461.

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Peterman Island is located in the archipelago of the Wilhelm Islands on the west coast of the Antarctic Peninsula (Graham Land). It is composed of gabbroids and granitoids of the Andean complex, which formed almost 100 million years later than the volcanic group of the Antarctic Peninsula. To clarify their genesis and geodynamic conditions of formation, gabbroids of the Andean complex are of particular interest, since the petrological models of their formation are well developed. Gabbroid intrusions comprise small bodies that are widespread along the Antarctic Peninsula. Among them stand out o

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Ng, C. W. W., C. E. Choi, A. Y. Su, J. S. H. Kwan, and C. Lam. "Large-scale successive boulder impacts on a rigid barrier shielded by gabions." Canadian Geotechnical Journal 53, no. 10 (2016): 1688–99. http://dx.doi.org/10.1139/cgj-2016-0073.

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Debris flows occur in multiple surges. Boulders entrained within the flow have been reported to incapacitate structures within its flow path. Single-layer cushions, such as gabions, are often installed to shield debris-resisting barriers from boulder impact. However, most relevant works only focus on single impact and the performance of gabions subjected to successive loading is still not well understood. A new large-scale pendulum facility was established to induce impact energy of up to 70 kJ on an instrumented rigid barrier shielded by 1 m thick gabions. The response of the gabions under si

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O'Driscoll, B. "The Centre 3 layered gabbro intrusion, Ardnamurchan, NW Scotland." Geological Magazine 144, no. 6 (2007): 897–908. http://dx.doi.org/10.1017/s0016756807003846.

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AbstractDetailed remapping of the Palaeogene Ardnamurchan Centre 3 gabbros, NW Scotland, suggests that this classic sequence of ring-intrusions forms a composite layered lopolith. The area mapped by previous studies as the Great Eucrite gabbro intrusion comprises 70% by area of Centre 3. Field observations suggest that most of the other smaller ring-intrusions of Centre 3 (interior to the Great Eucrite) constitute either distinct petrological facies of the same intrusion, or included country-rock or peridotite blocks. These observations, together with syn-magmatically deformed inward-dipping m

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Dumańska-Słowik, Magdalena, and Wiesław Heflik. "Ultramafic and Mafic Rocks Found in the Near Vicinity of Mariupolites within the Alkaline Oktiabrski Massif (SE Ukraine) – Preliminary Investigations." Gospodarka Surowcami Mineralnymi 32, no. 2 (2016): 63–78. http://dx.doi.org/10.1515/gospo-2016-0015.

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AbstractThe preliminary results of the mineralogical and geochemical investigations of ultramafic (peridotite and pyroxenite) and mafic (olivine gabbro) rocks from the Mazurovski Field of the Oktiabrski Massif in South-eastern Ukraine are presented in this paper. Peridotite is mainly composed of olivine (forsterite), pyroxene (diallage), plagioclase (labradorite) and ore minerals such as magnetite, ilmenite and pyrite. Antigorite and talk are secondary components. Diallage with subordinate plagioclase, olivine and Fe compounds (oxides/sulphides) are found in pyroxenite. Gabro is made of two ge

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Nakazawa, Hiroshi, Kazuya Usukura, Tadashi Hara, et al. "Problems in Earthquake Resistance Evaluation of Gabion Retaining Wall Based on Shake Table Test with Full-Scale Model." Journal of Disaster Research 14, no. 9 (2019): 1154–69. http://dx.doi.org/10.20965/jdr.2019.p1154.

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The earthquake (Mw 7.3) that struck Nepal on April 25, 2015 caused damage to many civil engineering and architectural structures. While several road gabion retaining walls in mountainous regions incurred damage, there was very little information that could be used to draw up earthquake countermeasures in Nepal, because there have been few construction cases or case studies of gabion structures, nor have there been experimental or analytical studies on their earthquake resistance. Therefore, we conducted a shake table test using a full-scale gabion retaining wall to evaluate earthquake resistan

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LINDH, ANDERS, ULF BERTIL ANDERSSON, THOMAS LUNDQVIST, and STEFAN CLAESSON. "Evidence of crustal contamination of mafic rocks associated with rapakivi rocks: an example from the Nordingrå complex, Central Sweden." Geological Magazine 138, no. 4 (2001): 371–86. http://dx.doi.org/10.1017/s0016756801005672.

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Gabbro and leucogabbro are volumetrically important rocks in the Nordingrå rapakivi complex, East Central Sweden. Plagioclase, ortho- and clinopyroxenes, and olivine dominate the gabbro. Perthitic orthoclase and quartz are interstitial in relation to the major minerals. The present work is based on 232 major-element and a large number of trace element analyses together with 15 whole rock Sm–Nd isotope analyses of the Nordingrå gabbroic rocks. εNd(T) values are negative, −1.1 to −3.2; the most negative values come from the gabbro. Most rocks are enriched in iron, some extremely enriched; none r

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ROBERTS, R. J., F. CORFU, T. H. TORSVIK, L. D. ASHWAL, and D. M. RAMSAY. "Short-lived mafic magmatism at 560–570 Ma in the northern Norwegian Caledonides: U–Pb zircon ages from the Seiland Igneous Province." Geological Magazine 143, no. 6 (2006): 887–903. http://dx.doi.org/10.1017/s0016756806002512.

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The Seiland Igneous Province (SIP) of northern Norway comprises a suite of mainly gabbroic plutons, with subordinate ultramafic, syenitic and felsic intrusions. Several intrusions from the Seiland Igneous Province have been dated by ID-TIMS U–Pb zircon and monazite analyses. The Hasvik Gabbro on the island of Sørøy, previously assigned an age of 700±33 Ma by Sm–Nd, yields a U–Pb zircon age of 562±6 Ma, within error of the Storelv Gabbro (569±5 Ma) and a diorite associated with the Breivikbotn Gabbro (571±4 Ma). Various intrusions on the Øksfjord peninsula give nearly identical ages of 565±9 Ma

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Spray, John G., and Gregory R. Dunning. "A U/Pb age for the Shetland Islands oceanic fragment, Scottish Caledonides: evidence from anatectic plagiogranites in ‘layer 3’ shear zones." Geological Magazine 128, no. 6 (1991): 667–71. http://dx.doi.org/10.1017/s0016756800019762.

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AbstractHigh precision U/Pb data obtained from zircons extracted from plagiogranite within the gabbro unit of the Shetland Islands oceanic fragment of northeast Scotland yield an age of 492 ± 3 Ma. Field relations indicate that the plagiogranites were generated by the partial melting of amphibolitized gabbros within high-temperature shear zones formed due to crustal deformation and fluid infiltration occurring in proximity to a spreading centre. The U/Pb data therefore constrain the crystallization age of the Shetland complex. This age is similar to U/Pb ages obtained from the Leka (497±2 Ma),

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Wadsworth, W. J. "Silicate mineralogy of the Behelvie cumulates, N E Scotland." Mineralogical Magazine 55, no. 378 (1991): 113–19. http://dx.doi.org/10.1180/minmag.1991.055.378.09.

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AbstractUltramafic, troctolitic and gabbroic rocks at the northern end of the Belhelvie layered intrusion display progressive cryptic variation over a stratigraphic thickness of approximately 800 m in steeply-dipping cumulates, which young from W to E. This variation is shown by olivine (Fo87−77), orthopyroxene (En87−79), clinopyroxene (Ca45Mg48Fe7 to Ca44.5Mg45.5Fe10) and plagioclase (An81−75). The Belhelvie succession is believed to be equivalent to the poorly-exposed and structurally complex Insch Lower Zone. A laterally impersistent hypersthene-gabbro unit within the main sequence is re-in

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Snachev, Vladimir I., Aleksandr V. Snachev, and Boris A. Puzhakov. "Geology, physical-chemical and geodynamic conditions for the formation of Sokolovsk and Krasnokamensk granitoid massifs (South Ural)." Georesursy 23, no. 1 (2021): 85–93. http://dx.doi.org/10.18599/grs.2021.1.9.

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The article describes the geological structure of the Sokolovsk and Krasnokamensk massifs located in the central part of the Western subzone of the Chelyabinsk-Adamovka zone of the Southern Urals. They are of Lower Carboniferous age and break through the volcanogenic-sedimentary deposits of the Krasnokamensk (D3kr) and Bulatovo (S1-D1bl) strata. It was found that these intrusions belong to the gabbro-syenite complex and are composed of gabbroids (phase I) and syenites, quartz monzonites, less often monzodiorites (phase II). The rocks of the second phase predominate (90–95%). Gabbros belong to

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Pe-Piper, Georgia. "Mineralogy of an Appinitic Hornblende Gabbro and Its Significance for the Evolution of Rising Calc-Alkaline Magmas." Minerals 10, no. 12 (2020): 1088. http://dx.doi.org/10.3390/min10121088.

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The magmatic and sub-solidus evolution of calcic amphiboles and Fe–Ti oxides was investigated in the Neoproterozoic Frog Lake pluton, Nova Scotia, Canada, in order to understand the relationship between the history of hydrous magma and the resulting mineralogy. The pluton occurs as sheet-like bodies of hornblende gabbro and hornblendite, with lesser tonalite dykes and granite bodies, interlayed with screens of medium-grade metamorphic country rock. Small, diffuse clots of felsic minerals are present in the gabbro. The subsolidus growth of actinolite occurs in early clinopyroxenes and amphibole

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You, Minxin, Wenyuan Li, Houmin Li, Zhaowei Zhang, and Xin Li. "Petrogenesis and Tectonic Significance of the ~276 Ma Baixintan Ni-Cu Ore-Bearing Mafic-Ultramafic Intrusion in the Eastern Tianshan Orogenic Belt, NW China." Minerals 11, no. 4 (2021): 348. http://dx.doi.org/10.3390/min11040348.

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The Baixintan mafic-ultramafic intrusion in the Dananhu-Tousuquan arc of the Eastern Tianshan orogenic belt is composed of lherzolite, olivine gabbro, and gabbro. Olivine gabbros contain zircon grains with a U-Pb age of 276.8 ± 1.1 Ma, similar to the ages of other Early Permian Ni-Cu ore-bearing intrusions in the region. The alkaline-silica diagrams, AFM diagram, together with the Ni/Cu-Pd/Ir diagram, indicate that the parental magmas for the Baixintan intrusion were likely high-Mg tholeiitic basaltic in composition. The Cu/Pd ratios, the relatively depleted PGEs and the correlations between t

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Nakazawa, Hiroshi, Tsuyoshi Nishi, Hiroyuki Kurihara, Daisuke Suetsugu, and Tadashi Hara. "Basic Study on Deformation Evaluation of Steel Wire Mesh for Rational Gabion Structure Design." EPI International Journal of Engineering 2, no. 2 (2019): 109–15. http://dx.doi.org/10.25042/epi-ije.082019.04.

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Gabion structures are used in a variety of ways in Japan and around the world because they allow for the creation of simple structures at highly reasonable construction costs and completion periods. Previous earthquake damage surveys have shown that, in many cases, gabion structures did not collapse even though deformation was allowed, and have demonstrated that the wire mesh used in their construction has a high confinement effect on the stones filling the gabion. Despite this, gabions have not been actively utilized, nor have they been used to construct permanent structures in Japan because

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Yazgan, Evren, and Roger Mason. "Orbicular gabbro from near Baskil, southeastern Turkey." Mineralogical Magazine 52, no. 365 (1988): 161–73. http://dx.doi.org/10.1180/minmag.1988.052.365.03.

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AbstractThe first occurrence of orbicular rocks in Turkey is reported. They are gabbros in a dyke in the Baskil island-arc magmatic suite, of the southern branch of the Alpine-Himalayan chain. The orbicules have lithologically varied cores, regular shells of troctolitic composition, with a radial arrangement of olivine and plagioclase crystals, and a matrix of vari-textured gabbro. Rock and mineral analyses indicate that magmatic crystallization began near the inner margin of the troctolitic shells. Metamorphic hydration of minerals in cores, shells and matrix followed directly after the later

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Ngounouno, Ismaila, Christian Moreau, Bernard Deruelle, Daniel Demaiffe, and Raymond Montigny. "Petrologie du complexe alcalin sous-sature de Kokoumi (Cameroun)." Bulletin de la Société Géologique de France 172, no. 6 (2001): 675–86. http://dx.doi.org/10.2113/172.6.675.

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Abstract The Cameroon Line was created by the rejuvenation, at the beginning of the opening of the Atlantic Ocean, of a Pan-African N070 degrees E fracture zone [Moreau et al., 1987], which acted as a huge lithospheric crack taping a hot asthenospheric zone [Deruelle et al., 1998; Marzoli et al., 2000]. The Kokoumi anorogenic pluton belongs to the E-W Garoua rift structure, which represents the easternmost extension of the Benue trough. The Garoua rift opened during the Neocomian-Lower Aptian ages [Benkhelil, 1988] through the rejuvenation of Pan-African normal faults. The rift subsided, was p

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Nguyen, Du Khac, and Tomoaki Morishita. "Petro-geochemical characteristics and origin of the quartz in the lower oceanic crust, example from IODP-Hole U1473A." Journal of Mining and Earth Sciences 61, no. 4 (2020): 67–74. http://dx.doi.org/10.46326/jmes.2020.61(4).07.

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IODP-Hole U1473A was drilled on the summit of Atlantis bank, Southwest Indian Ridge recovered large amounts of gabbroic rocks including mainly olivine gabbro. Felsic rocks are minor, approximately 1,5% of the total volume, which are comprising significant amount of quartz in some samples. The Ti concentrations and the estimated temperatures of the quartz in veins are relatively high, ranging from 30÷130 ppm and 540÷7000C, coupled with the myrmekitic textures in some veins are unambigeous evidence for the late magmatic origin. In addition to the crystallization mechanism in free spaces, such as

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KHALATBARI JAFARI, MORTEZA, HADI SEPEHR, and KATAYOUN MOBASHER. "Tectonomagmatic evolution of the South Dehshir Ophiolite, Central Iran." Geological Magazine 153, no. 4 (2015): 557–77. http://dx.doi.org/10.1017/s0016756815000618.

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AbstractThe South Dehshir Ophiolite, exposed along the southwestern margin of the Central Iranian microcontinent, comprises a mantle and a crustal sequence. This massif contains serpentinized peridotites, gabbros and diabase sheeted dykes cutting across wherlite, pegmatitic gabbro and plagiogranite, and is tectonically covered by radiolarites, pelagic limestones with Late Cretaceous microfauna and lavas. Under a microscope, the gabbros exhibit mesocumulate, adcumulate and hetradcumulate textures presumably formed in open magma chambers. Hypabyssal and lava samples show tholeiitic to calc-alkal

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