A developmental model of olivine morphology as a function of the cooling rate and the degree of undercooling

Fauré, François; Trolliard, Gilles; Nicollet, Christian; Montel, Jean-Marc

doi:10.1007/s00410-003-0449-y

Cited by 209 publications

(173 citation statements)

References 26 publications

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“…4A) pyroxenes are common. The variety of crystal shapes are clearly related to cooling rate and degree of undercooling of the melts (e.g., Donaldson et al 1975;Arndt et al 1984;Faure et al 2003) and not surprisingly, point to very fast cooling rate values (in the order of a few K/s or faster). Furthermore, droplets or grains of metal (typically Fe 98 wt%, Ni 2 wt%) and troilite are present in most of the spherules, and are normally less than 30 µm in diameter.…”

Section: Spherulesmentioning

confidence: 99%

Evidence for K‐rich terranes on Vesta from impact spherules

Barrat¹,

Bohn²,

Gillet³

et al. 2009

Meteorit & Planetary Scien

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Abstract-The howardite-eucrite-diogenite (HED) clan is a group of meteorites that probably originate from the asteroid Vesta. Some of them are complex breccias that contain impact glasses whose compositions mirror that of their source regions. Some K-rich impact glasses (up to 2 wt% K 2 O) suggest that in addition to basalts and ultramafic cumulates, K-rich rocks are exposed on Vesta's surface. One K-rich glass (up to 6 wt% K 2 O), with a felsic composition, provides the first evidence of highly differentiated K-rich rocks on a large asteroid. They can be compared to the rare lunar granites and suggest that magmas generated in a large asteroid are more diverse than previously thought.

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Section: Spherulesmentioning

confidence: 99%

Evidence for K‐rich terranes on Vesta from impact spherules

Barrat¹,

Bohn²,

Gillet³

et al. 2009

Meteorit & Planetary Scien

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“…While this certainly influences the Mg# of mafic phases in the experiments, it is not expected to have a significant effect on growth kinetics of synthetic phases compared to the natural basalt from which MIL 03346 is derived. Detailed study of olivine forming in the synthetic simple CaO-MgO-Al 2 O3-SiO 2 system (e.g., Faure et al 2003) compares favorably with kinetics of olivine crystallization in natural basalt (e.g., Faure and Schiano 2004).…”

Section: Relevance Of Experimental Data Setmentioning

confidence: 99%

Application of a textural geospeedometer to the late‐stage magmatic history of MIL 03346

Hammer

2009

Meteorit & Planetary Scien

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The Ca-pyroxene phenocryst and microphenocryst three dimensional (3D) aspect ratios are 112 ± 8.3 and 1530 ± 160 mm −1 , respectively. By comparison with the calibration set, the range of cooling rates consistent with 3D aspect ratios of both populations in MIL 03346 is ∼20 °C h −1 . An additional experiment was performed approximating a conductive heat transfer profile in order to interpret and apply results of constant-rate cooling experiments to the natural cooling of magma. Results suggest that the textures of constant-rate experiments parallel the initial period of rapid cooling in natural magma. Initial cooling rates of ∼20 °C h −1 in the lava hosting MIL 03346 occur in conductively solidifying lava at depths of ∼0.4 m, constraining the minimum total thickness to ≥0.8 m. Crystal accumulation beginning in a subsurface reservoir and continuing after lava emplacement as an inflated pahoehoe sheet satisfies all textural constraints on the late-stage igneous history of MIL 03346.

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“…Morphology of dendrites as a function of increased undercooling parameter follows the sequence: tablet → hopper crystal (hourglass shape) → incipient dendrite (baby swallowtail crystal) → dendrite (swallowtail morphology). Lattice olivine, chain olivine and branching olivine represent different cross-sections of the same kind of dendrite fiber (Faure et al, 2003a). The growth of dendrites is the result of the propagation of small aligned hopper crystals to form the dendritic fibers; we use "bar" as a synonym for those dendritic fibers.…”

Section: Barred Olivine-like Samplesmentioning

confidence: 99%

“…According to the olivine morphology model, Faure et al (2003a;b) found that olivine dendrites (swallowtail morphology) are formed by a rapid growth regime. This fast crystallization is mainly influenced by the degree of undercooling with minor influence of cooling rate.…”

Section: Chemical Analyses Of Samplesmentioning

confidence: 99%

“…In this work we use the texture description of olivine dendrites by Faure et al (2003a;2003b) who developed a model to correlate olivine morphology as a function of cooling rate and degree of undercooling. Morphology of dendrites as a function of increased undercooling parameter follows the sequence: tablet → hopper crystal (hourglass shape) → incipient dendrite (baby swallowtail crystal) → dendrite (swallowtail morphology).…”

Section: Barred Olivine-like Samplesmentioning

confidence: 99%

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Experimental chondrules by melting samples of olivine, clays and carbon with a CO2 laser

Cruz¹,

Gutiérrez²,

Viñas³

et al. 2015

BSGM

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Chondrules are the major constituents of chondritic meteorites; however, their origin is still an enigma for meteoritic science. In this work we report the results of melting minerals to experimentally generate objects similar to chondrules. The degree of fusion of olivine appears to be an important factor in determining the width of the bars in samples with barred-type olivine (BO) chondrules. On the other hand, the contribution of clays and carbon (possible precursor grains) is an important factor in those experiments where the melted samples showed porphyritic texture.Keywords: experimental chondrules, chondrites, CO 2 laser. Resumen Los condros son los constituyentes principales de las meteoritas condríticas. Sin embargo, su formación sigue siendo un enigma para la ciencia de la meteorítica. En este trabajo se reportan los resultados de la fusión de minerales para obtener fundidos tipo condro. El grado de fusión del olivino es un factor importante para determinar el ancho de las barras de las muestras tipo condros barrados de olivino (BO). Por otra parte, la contribución de arcillas y carbón (posibles componentes de los granos precursores) es un factor importante en los experimentos en los que los fundidos generados tienen textura porfídica.Palabras clave: condros experimentales, condritas, láser de CO 2 .

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A developmental model of olivine morphology as a function of the cooling rate and the degree of undercooling

Cited by 209 publications

References 26 publications

Evidence for K‐rich terranes on Vesta from impact spherules

Evidence for K‐rich terranes on Vesta from impact spherules

Application of a textural geospeedometer to the late‐stage magmatic history of MIL 03346

Experimental chondrules by melting samples of olivine, clays and carbon with a CO2 laser

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