Zircon saturation in silicate melts: a new and improved model for aluminous and alkaline melts

Gervasoni, Fernanda; Klemme, Stephan; Rocha-Júnior, Eduardo R.V.; Berndt, Jasper

doi:10.1007/s00410-016-1227-y

Cited by 120 publications

(90 citation statements)

References 34 publications

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“…The onset of zircon crystallisation is predicted for each saturation model as the cross-over of the predicted Zr-melt trend with the respective saturation model curve. Therefore, our own Zr solubility data suggest zircon saturation at around 810 °C, while Watson and Harrison (1983) yield a temperature of 750 °C and Boehnke et al (2013), Gervasoni et al (2016) as well as Borisov and Aranovich (2019) result saturation temperatures at or below 700 °C. Consequently, the more recent models severely overestimate zirconium solubility at low magmatic temperatures (< 800 °C) predicting zircon saturation temperatures close to or even below the inferred solidus.…”

Section: Zircon Saturationsupporting

confidence: 55%

“…Referring back to Fig. 10, established zircon saturation temperatures after Boehnke et al (2013), Gervasoni et al (2016) and Borisov and Aranovich (2019) (≤ 700 °C) imply that all zircons present in the solidified tonalite must have crystallised at the final emplacement depth at shallow levels and none could have been derived from deeper reservoirs during magma ascent. Therefore, the age range observed for the zircon population is entirely assigned to emplacement and solidification at the level of final intrusion of the magma in the shallow crust because melt fractions at zircon saturation are below 15 vol.…”

Section: Zircon Saturationmentioning

confidence: 80%

“…Table 1 (Electronic Supplementary Material ESM 1) displays the chemical composition of the natural starting material TML (sample 63.1.1) determined by XRF (Verberne 2013). Zirconium was added to test existing zircon saturation models (Watson and Harrison 1983;Boehnke et al 2013;Gervasoni et al 2016;Borisov and Aranovich 2019) for their applicability to intermediate to felsic magmatic systems. Experiments were conducted in Au 90 Pd 10 or Au 100 capsules with an outer diameter of 2.3 mm.…”

Section: Starting Materials and Capsule Designmentioning

confidence: 99%

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Crystallisation and zircon saturation of calc-alkaline tonalite from the Adamello Batholith at upper crustal conditions: an experimental study

Marxer

Ulmer

2019

Contrib Mineral Petrol

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The understanding of the geochemical and petrophysical evolution of magmas forming intermediate calc-alkaline batholiths at shallow crustal levels critically depends on knowledge of the phase equilibria relations along the liquid line of descent.Here, we present experimental results for a tonalitic system at a pressure of 200 MPa and under water-saturated conditions. Melting experiments were performed at temperatures between 700 and 1000 °C in externally heated HCM pressure vessels, with oxygen fugacity controlled close to the Ni-NiO buffer equilibrium (NNO) employing an argon-methane mixture as pressure medium and Co-Pd redox sensors to verify fO 2 conditions. Natural rock powder of a medium-K tonalite from the Adamello Batholith in Northern Italy served as experimental starting material. Based on compositional data of stable phases in the run products and images of entire run charges, mass balance calculations as well as image processing were performed to investigate the evolution of the crystal/melt ratio with respect to temperature. Furthermore, compositional trends of minerals as well as the liquid line of descent of residual melts were obtained. Orthopyroxene, clinopyroxene and plagioclase were identified as near-liquidus phases (below 990 °C). At 900 °C, amphibole joins the solid-phase assemblage at the expense of clinopyroxene, indicating the existence of a peritectic relationship. After an initial near-linear decrease with temperature, residual melt fractions exhibit a plateau of 45-55 vol. % between 750 and 850 °C, followed by a rapid decrease coinciding with quartz saturation at 725 °C. Compositions of residual liquids evolve along a typical calc-alkaline differentiation trend with decreasing temperature (increasing SiO 2 and decreasing TiO 2 , Al 2 O 3 , CaO, MgO and FeO contents) and become peraluminous below 900 °C. Intermediate to acidic rocks from the Adamello follow the experimental liquid line of descent indicating that the observed compositional spread of the natural intermediate composition rock record can be explained by low-pressure magma differentiation and liquid extraction. Experimentally determined zircon saturation levels are at low temperatures distinctly lower compared to existing and often used Zr-saturation models, but fully consistent with observed and modelled Zr-evolution trends from the natural rock record of the Southern Adamello Batholith inferring that zircon saturation in these intermediate to felsic plutonic rocks occurred at 800-830 °C corresponding to a melt fraction of about 50 vol. %.

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Section: Zircon Saturationsupporting

confidence: 55%

Section: Zircon Saturationmentioning

confidence: 80%

Section: Starting Materials and Capsule Designmentioning

confidence: 99%

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Crystallisation and zircon saturation of calc-alkaline tonalite from the Adamello Batholith at upper crustal conditions: an experimental study

Marxer

Ulmer

2019

Contrib Mineral Petrol

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“…(Tabela 2). O cálculo da média das temperaturas, de acordo comWatson e Harrison (1983),Miller et al (2003),Boehnke et al (2013) e Gervasoni et al (2016, foi, respectivamente, de 756 ± 18, 760 ± 18, 689 ± 22 e 645 ± 38ºC.…”

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“…760 ± 18ºC, respectivamente, geram, por meio do software, isotermas de 450, 500, 550 e 600ºC. Os geotermômetros deBoehnke et al (2013) e Gervasoni et al (2016, calibrações mais recentes, mostram valores de 689 ± 22 e 645 ± 38ºC,…”

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Mecanismo de colocação e auréola termal provocada pelo plúton Ediacarano Catingueira, Província Borborema, Nordeste do Brasil

Cunha

Souza

Moreira

et al. 2018

Geol. USP. Sér. cient.

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Disponível on-line no endereço www.igc.usp.br/geologiausp -209 -Resumo O plúton Catingueira, com área de aproximadamente 12 km 2 , é um granito peralcalino Ediacarano situado entre o Terreno Piancó-Alto Brígida e a Zona de Cisalhamento Patos, Província Borborema (NE Brasil). A intrusão formou uma auréola metamórfica em rochas metapelíticas da Formação Santana dos Garrotes. O presente trabalho trata da caracterização desse efeito termal, usando relações de campo, petrografia, química mineral e propriedades petrofísicas (condutividade térmica, calor específico, difusividade térmica e densidade). Utilizando-se o geotermômetro de zircônio em rochas peralcalinas, calculou--se o valor médio de 760 ± 18ºC para a temperatura inicial do magma. A colocação do plúton é marcada por: verticalização de estruturas de baixo ângulo da encaixante metassedimentar, as quais adquirem direção próxima de E-W, concordante com milonitos da Zona de Cisalhamento Patos; metamorfismo de alta temperatura (450-610ºC) e baixa pressão (3 kbar) cujo efeito é sentido a até 2,5 km do contato, com desenvolvimento da associação biotita ± granada ± estaurolita ± cordierita± sillimanita (+ clorita + muscovita). A modelagem numérica do regime térmico provocado pela intrusão foi feita por meio do software HEAT3D. As simulações foram calculadas a partir de duas formas geométricas, um cilindro vertical e um paralelepípedo horizontal, usando gradientes geotérmicos variando de 30 a 50ºC/km. Para atingir o equilíbrio térmico, foram calculados tempos de resfriamento de 781, 1.032 e 1.127 mil anos. O gradiente que permitiu atingir o melhor ajuste para o modelo foi de 50ºC/km, resultando 1.127 mil anos. Os resultados aqui obtidos em termos de dimensão, forma, profundidade e associações metamórficas são comparáveis a exemplos de outros corpos plutônicos descritos na Província Borborema.Palavras-chave: Granito Catingueira; Ediacarano; Metamorfismo de contato; Zona Transversal; NE do Brasil. AbstractThe Catingueira pluton, with an approximate area of 12 km 2 , is an Ediacaran peralkaline granite located between the Piancó-Alto Brígida Terrane and the Patos Shear Zone, Borborema Province (NE Brazil). The granite's intrusion formed a metamorphic aureole over the host metapelitic rocks of the Santana dos Garrotes Formation. The present paper deals with the characterization of this thermal effect by using field relationships, petrography, mineral chemistry and petrophysical properties (thermal conductivity, specific heat, thermal diffusivity and density). An average value of 760 ± 18ºC was calculated for the peralkaline magma's initial temperature using the zirconium geothermometer. The pluton emplacement provides two regional effects: verticalization of previous low angle structures of the host metapelites, which acquired an E-W direction parallelingthe mylonites of the Patos shear zone; high temperature (450-610ºC) and low pressure (3 kbar) metamorphism up to 2.5 km away from the pluton contact, and development of an assemblage including biotite ± garnet ± staurolite...

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Zircon as Magma Monitor

Claiborne

Miller

Gualda

et al. 2017

Geophysical Monograph Series

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Zircon saturation in silicate melts: a new and improved model for aluminous and alkaline melts

Cited by 120 publications

References 34 publications

Crystallisation and zircon saturation of calc-alkaline tonalite from the Adamello Batholith at upper crustal conditions: an experimental study

Crystallisation and zircon saturation of calc-alkaline tonalite from the Adamello Batholith at upper crustal conditions: an experimental study

Mecanismo de colocação e auréola termal provocada pelo plúton Ediacarano Catingueira, Província Borborema, Nordeste do Brasil

Zircon as Magma Monitor

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