The effects of FeO on the system CMAS at low pressure and implications for basalt crystallization processes

Shi, Ping Ping; Libourel, G.

doi:10.1007/bf00307332

Cited by 40 publications

(10 citation statements)

References 20 publications

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“…Figure 3(b) shows the effect of FeO content on crystallization temperature in the CaO-Al 2 O 3 -5 mass% MgO-FeO system during continuous cooling. Increased FeO content led to lower crystallization temperatures, which coincides well with the phase diagrams predictions of Factsage 18 and the results of past work 19 showing a decrease in the liquidus temperature of the slag with FeO additions, although this tendency disappears at higher cooling rates. In addition, above 15 mass% FeO, no appreciable difference in crystallization temperature is observed; thus, in the range of this study, there seems to be a limit to the effect of FeO addition on the crystallization temperature.…”

Section: (2) Effect Of Mgo and Feo On Cct And Ttt Curvessupporting

confidence: 90%

Effect of FeO Concentration on the Crystallization of High‐Temperature CaO–Al₂O₃–MgO–FeO Melts

Jung

Sohn

2012

J. Am. Ceram. Soc.

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Continuous cooling transformation (CCT) and time–temperature transformation (TTT) diagrams were plotted for CaO–Al2O3–MgO–FeO melts, and the morphology of the primary crystals formed was determined with a confocal laser scanning microscope (CLSM). When the CaO/Al2O3 ratio is 1.0, the crystallization temperature and incubation time increase with increasing MgO content. The TTT curve at 7.5 mass% MgO has a “C” shape, which facilitates the formation of amorphous phases. However, increasing the FeO content accelerated the crystallization time and lowered the crystallization temperature. The solidified melt with an FeO content of less than 10 mass% was a combination of the C3MA2 and C5A3 phases; higher FeO content led to the formation of a secondary phase of Ca2FeAlO5 and CA following the precipitation of the C3MA2 primary phase. In addition, kinetic evaluation of the crystal growth with confocal micrographs indicated that the calculated crystal volume agreed well with the Johnson–Mehl–Avrami sigmoidal curve fit.

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Section: (2) Effect Of Mgo and Feo On Cct And Ttt Curvessupporting

confidence: 90%

Effect of FeO Concentration on the Crystallization of High‐Temperature CaO–Al₂O₃–MgO–FeO Melts

Jung

Sohn

2012

J. Am. Ceram. Soc.

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“…14 shows that during cotectic crystallisation of olivine, plagioclase and clinopyroxenes, wt% P 2 O 5 required for phosphate saturation increases sharply, a trend which is only reversed by the appearance of magnetite. As discussed above this is the consequence of decreasing CaO content of the liquid during crystallisation of olivine gabbro (Shi and Libourel, 1991;Toplis and Carroll, 1995). Thus, if the appearance of magnetite on the liquidus is displaced to lower temperature (i.e., the middle segment in Fig.…”

Section: The Petrogenesis Of Rocks Dominated By Association Of Apatitmentioning

confidence: 87%

Predicting phosphate saturation in silicate magmas: An experimental study of the effects of melt composition and temperature

Tollari

Toplis

Barnes

2006

Geochimica et Cosmochimica Acta

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A series of 1 atm experiments has been performed to test the influence of iron content and oxidation state on the saturation of phosphate minerals in magmatic systems. Four bulk compositions of different iron content have been studied. The experiments cover a range of temperature from 1030 to 1070°C and oxygen fugacity from 1.5 log units below to 1.5 log units above the Fayalite-Magnetite-Quartz buffer. The results demonstrate that neither iron content of the liquid nor oxidation state play a significant role on phosphate saturation. On the other hand, SiO 2 and CaO contents of the liquid strongly influence the appearance of a crystalline phosphate. Our results are combined with data from the literature to define an equation which predicts the P 2 O 5 content of silicate liquids saturated in either whitlockite or fluorapatite: where M represents the molar percentage of the relevant oxides and T is temperature in K. This equation is valid over extremely wide ranges of liquid composition and temperature (e.g., M SiO 2 from 10% to 80%), including peraluminous liquids. The equation is used to illustrate the relative effects of melt chemistry and temperature on phosphate saturation, both in general terms and in particular for the case of ferrobasaltic differentiation relevant to the late stage differentiation of mafic layered intrusions. It is concluded that magmatic liquids may reach high concentrations in both iron and phosphorus, not through direct association of P 5+ and Fe 3+ , but rather as a consequence of the variations of CaO and SiO 2 content of the liquid. These results may help explain the petrogenesis of certain enigmatic rock types dominated by association of apatite and iron-titanium oxides, such as nelsonites.

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“…On the basis of olivine/basalt partition coefficient reported recently by Médard and Grove (2008;K d Ol/basalt Fe/Mg =0.32) and clinopyroxene/ basalt partition coefficient determined under low-pressure conditions (Shi and Libourel, 1991; K d Cpx/basalt Fe/Mg =0.26), we calculated the Mg# of the melt for the least evolved Bocca di Tenda olivine-gabbronorite. Computed Mg# of the melts in equilibrium with the most primitive olivine (Fo78) and clinopyroxene (Mg#= 0.85) are 53 and 57, respectively.…”

Section: Origin Of the Olivine-gabbronoritesmentioning

confidence: 99%

Petrogenesis of Early Permian olivine-bearing cumulates and associated basalt dykes from Bocca di Tenda (Northern Corsica): Implications for post-collisional Variscan evolution

et al. 2009

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The effects of FeO on the system CMAS at low pressure and implications for basalt crystallization processes

Cited by 40 publications

References 20 publications

Effect of FeO Concentration on the Crystallization of High‐Temperature CaO–Al₂O₃–MgO–FeO Melts

Effect of FeO Concentration on the Crystallization of High‐Temperature CaO–Al₂O₃–MgO–FeO Melts

Predicting phosphate saturation in silicate magmas: An experimental study of the effects of melt composition and temperature

Petrogenesis of Early Permian olivine-bearing cumulates and associated basalt dykes from Bocca di Tenda (Northern Corsica): Implications for post-collisional Variscan evolution

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The effects of FeO on the system CMAS at low pressure and implications for basalt crystallization processes

Cited by 40 publications

References 20 publications

Effect of FeO Concentration on the Crystallization of High‐Temperature CaO–Al2O3–MgO–FeO Melts

Effect of FeO Concentration on the Crystallization of High‐Temperature CaO–Al2O3–MgO–FeO Melts

Predicting phosphate saturation in silicate magmas: An experimental study of the effects of melt composition and temperature

Petrogenesis of Early Permian olivine-bearing cumulates and associated basalt dykes from Bocca di Tenda (Northern Corsica): Implications for post-collisional Variscan evolution

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Effect of FeO Concentration on the Crystallization of High‐Temperature CaO–Al₂O₃–MgO–FeO Melts

Effect of FeO Concentration on the Crystallization of High‐Temperature CaO–Al₂O₃–MgO–FeO Melts