Preface

Cawthorn, Grant

doi:10.1016/s0167-2894(96)80001-7

Cited by 3 publications

(2 citation statements)

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“…Exibem normalmente acamamento ígneo (rítmico e crítico), ciclicidade de pulsos magmáticos e texturas cumuláticas. Ocorrem como corpos intrusivos de dimensões variadas sob a forma de diques, sills e lopólitos em diferentes ambientes, i.e., cratônicos ou plataformais, riftes, e em menor escala, regiões orogênicas (Cawthorn, 1996;Charlier et al, 2015). Hospedam grandes depósitos de cromita, níquel, cobre e platinoides junto às porções ultramáficas menos diferenciadas e depósitos de Fe-Ti-V associados a magnetita e ilmenita nos termos mais diferenciados, i.e., rochas gabroicas e noríticas, (Naldrett, 2004;Eckstrand e Hulbert, 2007).…”

Section: Introductionunclassified

Litoestratigrafia e aspectos metalogenéticos do Complexo Máfico-Ultramáfico Estratiforme de Tucunduba, Província Borborema, Ceará – Brasil

Cavalcante

Parente

Guimarães

et al. 2023

Geol. USP. Sér. Cient.

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O Complexo Máfico-Ultramáfico Estratiforme de Tucunduba (CMUET) compreende uma intrusão acamadada com geometria elipsoidal, com eixo maior apresentando direção N025° e área de aproximadamente 4 km2, constituído de metapiroxenitos, metagabros e metagabronoritos intrudidos em rochas granito-migmatíticas de idade paleoproterozoica do Domínio Ceará Central (DCC), Província Borborema (PB), Nordeste do Brasil. Essa associação magmática é cortada por diques alcalinos de idade oligocênica, pertencentes ao Vulcanismo Messejana. As rochas máfico-ultramáficas são representadas por três zonas litológicas: Zona Ultramáfica de composição peridotítica e piroxenítica localizada na porção noroeste do complexo; Zona de Transição caracterizada por mistura de rochas piroxeníticas e gabroicas, com textura e estrutura variadas; e Zona Máfica de composição gabro-norítica, concentrada na porção sudeste, além dos bordos oeste e norte do corpo. As zonas formadoras do CMUET foram afetadas parcialmente por deformação e recristalização metamórfica, resultantes de metamorfismo regional em fácies granulito, evidenciado por textura de poligonização formada por cristais de ortopiroxênio e clinopiroxênio, bem como ocorrência de hercinita, experimentaram retrometamorfismo em fácies anfibolito, com expressiva formação de hornblenda, e alteração hidrotermal em condições de fácies xisto verde a sub-xisto verde, caracterizada pela formação de minerais hidratados (talco, serpentina, actinolita, tremolita e clorita). Texturas e estruturas primárias, como acamamento ígneo, do tipo rítmico, e textura cumulática, são ainda preservadas. Importantes ocorrências de blocos de minério maciço rico em Fe-Ti (± V) são encontradas, principalmente, no domínio das rochas metamáficas. Dados de geoquímica de solos indicam valores anômalos de S, Cu, Co, Ni, Ti e V, sugerindo a existência de alvos potenciais para sulfetos (Cu, Co e Ni) e óxidos (Ti e V).

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Section: Introductionunclassified

Litoestratigrafia e aspectos metalogenéticos do Complexo Máfico-Ultramáfico Estratiforme de Tucunduba, Província Borborema, Ceará – Brasil

Cavalcante

Parente

Guimarães

et al. 2023

Geol. USP. Sér. Cient.

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“…The meat production potential of game animals from Africa has been recognized for many years [2][3][4][5][6][7][8]. Game meat is frequently a by-product of the recreational hunting industry [9]; however, the potential of harvesting game species for meat production has only been recently recognised, together with investigations into how to make it a more sustainable food source.…”

Section: Introductionmentioning

confidence: 99%

Carcass Yields and Physical-Chemical Meat Quality Characteristics of Namibian Red Hartebeest (Alcelaphus buselaphus) as Influenced by Sex and Muscle

Hoffman

Schalkwyk

Müller

et al. 2021

Foods

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This study determined the carcass yields of red hartebeest from Namibia and compared the physical-chemical meat quality characteristics of six different muscles (biceps femoris, infraspinatus, longissimus thoracis et lumborum, semimembranosus, semitendinosus, and supraspinatus) for both males and females. Red hartebeest males were heavier (133.92 kg) than females (114.20 kg) but the average dressing percentage did not differ between the two sexes. Muscles from females had a lower mean shear force value of 3.59 kg/1.27 cm ø, compared to males (4.23 kg/1.27 cm ø). The most tender muscle was the infraspinatus of the female treatment group, while the semimembranosus of the male treatment group was the least tender muscle. Drip loss, cooking loss and L* (lightness) values were not affected by sex. The largest hue angle was observed in the semitendinosus muscle of the female treatment group (28.94°), and it was thus the lightest red muscle. The highest chroma values (17.3) were observed in the semimembranosus muscle. Muscle protein content averaged 20.5% over all treatment combinations, and the mean intra-muscular fat content for both male and female muscles was low (2.4%). The shoulder muscles, infraspinatus and supraspinatus, of the females had the highest fat content (2.7%). The results indicate that red hartebeest meat should be market according to specific muscles and that sex of the animals need not be considered during marketing.

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A 5-km-thick reservoir with > 380,000 km3 of magma within the ancient Earth's crust

Latypov

Chistyakova

Hornsey

et al. 2022

Sci Rep

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Several recent studies have argued that large, long-lived and molten magma chambers may not occur in the shallow Earth’s crust. Here we present, however, field-based observations from the Bushveld Complex that provide evidence to the contrary. In the eastern part of the complex, the magmatic layering continuously drapes across a ~ 4-km-high sloping step in the chamber floor. Such deposition of magmatic layering implies that the resident melt column was thicker than the stepped relief of the chamber floor. Prolonged internal differentiation within this thick magma column is further supported by evolutionary trends in crystallization sequence and mineral compositions through the sequence. The resident melt column in the Bushveld chamber during this period is estimated at > 5-km in thickness and > 380,000 km3 in volume. This volume of magma is three orders of magnitude larger than any known super-eruption in the Earth’s history and is only comparable to the extrusive volumes of some of Earth’s large igneous provinces. This suggests that super-large, entirely molten, and long-lived magma chambers occur, at least occasionally, in the geological history of our planet. Therefore, the classical view of magma chambers as ‘big magma tanks’ remains a viable research concept for some of Earth’s magmatic provinces.

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Preface

Cited by 3 publications

References 0 publications

Litoestratigrafia e aspectos metalogenéticos do Complexo Máfico-Ultramáfico Estratiforme de Tucunduba, Província Borborema, Ceará – Brasil

Litoestratigrafia e aspectos metalogenéticos do Complexo Máfico-Ultramáfico Estratiforme de Tucunduba, Província Borborema, Ceará – Brasil

Carcass Yields and Physical-Chemical Meat Quality Characteristics of Namibian Red Hartebeest (Alcelaphus buselaphus) as Influenced by Sex and Muscle

A 5-km-thick reservoir with > 380,000 km3 of magma within the ancient Earth's crust

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