A magmatic origin for silica-rich glass inclusions hosted in porphyritic magnesian olivines in chondrules: An experimental study

Fauré, François; Tissandier, L.; Florentin, Louis; Devineau, Karine

doi:10.1016/j.gca.2017.01.034

Cited by 7 publications

(4 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such elongated glass zones within polyhedral crystals have been produced in previous experiments with two cooling stages: a first slow cooling stage to crystallize euhedral crystals followed by a rapid cooling stage to produce skeletal overgrowths (Faure et al., 2007). However, in our and previous experiments (Faure et al., 2012, 2017), elongated glass inclusions lato sensu (i.e., open or closed inclusions) are present within crystals formed during a single slow cooling stage. This apparent contradiction is easily explained by the fact that nucleation is suppressed at low degrees of undercooling because the critical radius is large, resulting in an extensive incubation time (see previous section).…”

Section: Discussioncontrasting

confidence: 45%

“…These small crystals always show polyhedral shapes except in areas with large pools of liquid. These zones generally occur in the center of the charge and correspond to a well‐known experimental artifact due to crystal settling in long duration experiments with low viscosity liquids due to settling of crystals (Donaldson, 1977; Faure et al., 2017; Lofgren, 1989; Zieg & Lofgren, 2006). Crystals that grow toward these pools of liquid show skeletal or dendritic overgrowths whereas all other crystals in the same charge show polyhedral shapes (Fig.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of superheating and cooling rate on olivine growth in chondritic liquid

Auxerre

Fauré

Lequin

2022

Meteorit & Planetary Scien

Self Cite

View full text Add to dashboard Cite

Chondrules, the major constituent of chondrites, are millimeter-sized igneous objects resulting from the crystallization of silicate liquids produced by the partial or complete melting of chondritic precursors, whose exact nature remains disputed. Various chondrule textures are observed as a function of the extent of the initial melting event.Here, we report dynamic crystallization experiments performed with a broad range of cooling rates (2-750 °C h −1 ) from superliquidus or subliquidus initial conditions to demonstrate the control of nucleation on the final chondrule texture. Classical cryptoporphyritic, micro-porphyritic, and porphyritic olivine textures were reproduced in subliquidus experiments in which heterogeneous nucleation dominates. In contrast, we were unable to reproduce barred olivine textures, regardless of the cooling rates investigated from superliquidus conditions; instead, macro-porphyritic textures were systematically obtained at low cooling rates (<10 °C h −1 ). The small number and large size of crystals in the macroporphyritic texture are consistent with the initial step of superheating and the presence of long embayments that indicate an initial episode of rapid growth due to delayed nucleation. Crystals then acquired polyhedral shapes during a subsequent episode of slow growth. When the growth rate is too slow to decrease the degree of supersaturation in the liquid, a new episode of rapid growth produces a new generation of melt inclusions.

show abstract

Section: Discussioncontrasting

confidence: 45%

Section: Discussionmentioning

confidence: 99%

The effects of superheating and cooling rate on olivine growth in chondritic liquid

Auxerre

Fauré

Lequin

2022

Meteorit & Planetary Scien

Self Cite

View full text Add to dashboard Cite

show abstract

“…Perhaps the evolution of these melts is tracked by the various glass inclusions, from the Si‐rich ones which Faure et al. () ascribed to slow‐cooling entrapment of a CI (i.e., bulk chondrule‐like) composition melt to the Al‐rich ones which Faure et al. () linked to more Ca, Al‐rich compositions.…”

Section: Discussionmentioning

confidence: 99%

“…This indicates that type I olivine crystals are all equilibrated with evolved (as opposed to bulk chondrule composition) melts. Perhaps the evolution of these melts is tracked by the various glass inclusions, from the Si-rich ones which Faure et al (2017) ascribed to slow-cooling entrapment of a CI (that is, bulk chondrulelike) composition melt to the Al-rich ones which Faure et al (2012) linked to more Ca, Al-rich compositions.…”

Section: Chondrule Olivine Crystallization Trendsmentioning

confidence: 99%

Chondrule heritage and thermal histories from trace element and oxygen isotope analyses of chondrules and amoeboid olivine aggregates

Jacquet

Marrocchi

2017

Meteorit & Planetary Scien

View full text Add to dashboard Cite

We report combined oxygen isotope and mineral‐scale trace element analyses of amoeboid olivine aggregates (AOA) and chondrules in ungrouped carbonaceous chondrite, Northwest Africa 5958. The trace element geochemistry of olivine in AOA, for the first time measured by LA‐ICP‐MS, is consistent with a condensation origin, although the shallow slope of its rare earth element (REE) pattern is yet to be physically explained. Ferromagnesian silicates in type I chondrules resemble those in other carbonaceous chondrites both geochemically and isotopically, and we find a correlation between 16O enrichment and many incompatible elements in olivine. The variation in incompatible element concentrations may relate to varying amounts of olivine crystallization during a subisothermal stage of chondrule‐forming events, the duration of which may be anticorrelated with the local solid/gas ratio if this was the determinant of oxygen isotopic ratios as proposed recently. While aqueous alteration has depleted many chondrule mesostases in REE, some chondrules show recognizable subdued group II‐like patterns supporting the idea that the immediate precursors of chondrules were nebular condensates.

show abstract

Origin of Na in glass inclusions hosted in olivine from Allende CV3 and Jbilet Winselwan CM2: Implications for chondrule formation

Florentin

Fauré

Deloule

et al. 2017

Earth and Planetary Science Letters

View full text Add to dashboard Cite

A magmatic origin for silica-rich glass inclusions hosted in porphyritic magnesian olivines in chondrules: An experimental study

Cited by 7 publications

References 62 publications

The effects of superheating and cooling rate on olivine growth in chondritic liquid

The effects of superheating and cooling rate on olivine growth in chondritic liquid

Chondrule heritage and thermal histories from trace element and oxygen isotope analyses of chondrules and amoeboid olivine aggregates

Origin of Na in glass inclusions hosted in olivine from Allende CV3 and Jbilet Winselwan CM2: Implications for chondrule formation

Contact Info

Product

Resources

About