Journal: Contributions to Mineralogy and Petrology

Abbreviation

Contrib Mineral Petrol

Publisher

Springer

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ISSN

0010-7999
1432-0967

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Publications1 - 10 of 123
  • Titanium in phengite
    Item type: Journal Article
    Auzanneau, Estelle; Schmidt, M. W.; Vielzeuf, D.; et al. (2010)
    Contributions to Mineralogy and Petrology
  • Pyroxenite xenoliths from Marsabit (Northern Kenya)
    Item type: Journal Article
    Kaeser, Benjamin; Olker, Bettina; Kalt, Angelika; et al. (2009)
    Contributions to Mineralogy and Petrology
  • Metamorphic CO2 production from calc-silicate rocks via garnet-forming reactions in the CFAS-H2O-CO2 system
    Item type: Journal Article
    Groppo, Chiara; Rolfo, Franco; Castelli, Daniele; et al. (2013)
    Contributions to Mineralogy and Petrology
  • The youngest basic oceanic magmatism in the Alps (Late Cretaceous; Chiavenna unit, Central Alps)
    Item type: Journal Article
    Liati, Anthi; Gebauer, Dieter; Fanning, C. Mark (2003)
    Contributions to Mineralogy and Petrology
  • Diffusion pathways of Fe2+ and Fe3+ during the formation of ferrian chromite: a µXANES study
    Item type: Journal Article
    Gervilla, Fernando; Asta Andres, Maria Pilar; Fanlo, I.; et al. (2019)
    Contributions to Mineralogy and Petrology
  • Crystallographic orientations of magnesiochromite inclusions in diamonds: what do they tell us?
    Item type: Journal Article
    Nimis, Paolo; Angel, Ross J.; Alvaro, Matteo; et al. (2019)
    Contributions to Mineralogy and Petrology
  • U-Pb zircon dating of the Gruf Complex
    Item type: Journal Article
    Galli, Andrea; Le Bayon, Benjamin; Schmidt, Max W.; et al. (2012)
    Contributions to Mineralogy and Petrology
  • Species diffusion in clinopyroxene solid solution in the diopside–anorthite system
    Item type: Journal Article
    Lierenfeld, Matthias B.; Zhong, Xin; Reusser, Eric; et al. (2019)
    Contributions to Mineralogy and Petrology
    The coupled multicomponent diffusion of the species Ca2Si2O6, CaAl2SiO6 and Mg2Si2O6 was determined in diopside crystals in the diopside/anorthite (Di/An) system at temperatures (T) of 1110–1260 °C and oxygen fugacities (fO2) between 1.0 log unit below and above the fayalite–magnetite–quartz equilibrium (FMQ ± 1). Diffusion couples were prepared by the seed overgrowth technique. Element concentration profiles were measured perpendicular to the rim/core interface by step-scanning profiling with a field emission gun scanning electron microscope (FEG-SEM). The multicomponent diffusion matrix was solved by fitting its eigenvalues (λ) and eigenvectors (v) to the measured concentration profiles. The full diffusion matrix D can be recovered by using the formula D=PΛP−1 resulting in the following equation: DDi/An=[1.00−0.38−0.671.00][λ1(T)00λ2(T)][1.00−0.38−0.671.00]−1. The eigenvalues (λ1 and λ2) represent upper limit values and are described by the following Arrhenius-type equations: λ1(Di/An)=10−15.98±1.17×exp[−114.4±32.8kJ/molRT], λ2(Di/An)=10−16.23±1.17×exp[−114.4±32.8kJ/molRT], where λ1 and λ2 are the first and second eigenvalue of the diffusion matrix in m2 s−1, R is the gas constant and T is the temperature in K. The dominant eigenvalue (λ1) is one quarter order of magnitude larger than the second eigenvalue (λ2). The eigenvectors are constant for all experiments inferring that the entire D matrix can be described with the eigenvalues as the only T-dependent parameter. Additionally, the derived diffusion data and modeling approach were applied to constrain the duration of magmatic processes recorded in zoned clinopyroxene (cpx) phenocrysts from a basaltic, post-plutonic dyke of the Tertiary Adamello batholiths (N-Italy). The results reveal residence times of the overgrown cpx prior to final emplacement in the range of 0.25–1.7 years (lower limit values) testifying that the data and method can be applied to model cpx diffusion profiles in complex natural cpx.
  • Successive episodes of reactive liquid flow through a layered intrusion (Unit 9, Rum Eastern Layered Intrusion, Scotland)
    Item type: Journal Article
    Leuthold, Julien; Blundy, J.D.; Holness, M.B.; et al. (2014)
    Contributions to Mineralogy and Petrology
  • Polybaric fractional crystallisation of arc magmas: an experimental study simulating trans-crustal magmatic systems
    Item type: Journal Article
    Marxer, Felix; Ulmer, Peter; Müntener, Othmar (2022)
    Contributions to Mineralogy and Petrology
    Crystallisation-driven differentiation is one fundamental mechanism proposed to control the compositional evolution of magmas. In this experimental study, we simulated polybaric fractional crystallisation of mantle-derived arc magmas. Various pressure–temperature trajectories were explored to cover a range of potential magma ascent paths and to investigate the role of decompression on phase equilibria and liquid lines of descent (LLD). Fractional crystallisation was approached in a step-wise manner by repetitively synthesising new starting materials chemically corresponding to liquids formed in previous runs. Experiments were performed at temperatures ranging from 1140 to 870 °C with 30 °C steps, and pressure was varied between 0.8 and 0.2 GPa with 0.2 GPa steps. For most fractionation paths, oxygen fugacity (fO₂) was buffered close to the Ni-NiO equilibrium (NNO). An additional fractionation series was conducted at fO₂ corresponding to the Re-ReO₂ buffer (RRO ≈ NNO+2). High-pressure experiments (0.4–0.8 GPa) were run in piston cylinder apparatus while 0.2 GPa runs were conducted in externally heated pressure vessels. Resulting liquid lines of descent follow calc-alkaline differentiation trends where the onset of pronounced silica enrichment coincides with the saturation of amphibole and/or Fe–Ti–oxide. Both pressure and fO₂ exert crucial control on the stability fields of olivine, pyroxene, amphibole, plagioclase, and Fe–Ti–oxide phases and on the differentiation behaviour of arc magmas. Key observations are a shift of the olivine–clinopyroxene cotectic towards more clinopyroxene-rich liquid composition, an expansion of the plagioclase stability field and a decrease of amphibole stability with decreasing pressure. Decompression-dominated ascent trajectories result in liquid lines of descent approaching the metaluminous compositional range observed for typical arc volcanic rocks, while differentiation trends obtained for cooling-dominated trajectories evolve to peraluminous compositions, similar to isobaric liquid lines of descent at elevated pressures. Experiments buffered at RRO provide a closer match with natural calc-alkaline differentiation trends compared to fO₂ conditions close to NNO. We conclude that decompression-dominated fractionation at oxidising conditions represents one possible scenario for arc magma differentiation.
Publications1 - 10 of 123