Transcrystalline melt migration in clinopyroxene

Sonzogni, Y.; Provost, Ariel; Schiano, Pierre

doi:10.1007/s00410-010-0545-8

Cited by 5 publications

(8 citation statements)

References 23 publications

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“…On the other hand, it is possible that some or all of the inclusions migrated within the crystal after they were trapped (Sonzogni et al. ). Milman‐Barris et al.…”

Section: Discussionmentioning

confidence: 99%

“…Based on the concentric zoning of this olivine, one would conclude that the inner, larger inclusions were trapped before the small outer ones. On the other hand, it is possible that some or all of the inclusions migrated within the crystal after they were trapped (Sonzogni et al 2011). Milman-Barris et al (2008 interpreted the large size and asymmetric shapes of P-poor zones surrounding inclusions in olivine to be a result of a dissolution-replacement process during inclusion migration in a thermal gradient.…”

Section: Melt Inclusions In Olivinementioning

confidence: 99%

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K₂O‐rich trapped melt in olivine in the Nakhla meteorite: Implications for petrogenesis of nakhlites and evolution of the Martian mantle

Goodrich

Treiman

Filiberto

et al. 2013

Meteorit & Planetary Scien

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Abstract-We used new analytical and theoretical methods to determine the major and minor element compositions of the primary trapped liquid (PTLs) represented by melt inclusions in olivine and augite in the Martian clinopyroxenite, Nakhla, for comparison with previously proposed compositions for the Nakhla (or nakhlite) parent magma. We particularly focused on obtaining accurate K 2 O contents, and on testing whether high K 2 O contents and K 2 O/ Na 2 O ratios obtained in previous studies of melt inclusions in olivine in Nakhla could have been due to unrepresentative sampling, systematic errors arising from electron microprobe techniques, late alteration of the inclusions, and/or boundary layer effects. Based on analyses of 35 melt inclusions in olivine cores, the PTL in olivine, PTL oliv , contained (by wt) approximately 47% SiO 2 , 6.3% Al 2 O 3 , 9.6% CaO, 1.8% K 2 O, and 0.9% Na 2 O, with K 2 O/ Na 2 O = 2.0. We infer that the high K 2 O content of PTL oliv is not due to boundary layer effects and represents a real property of the melt from which the host olivine crystallized. This melt was cosaturated with olivine and augite. Its mg# is model-dependent and is constrained only to be ≥19 (equilibrium Fo = 40). Based on analyses of 91 melt inclusions in augite cores, the PTL in augite, PTL aug , contained (by wt) 53-54% SiO 2 , 7-8% Al 2 O 3 , 0.8-1.1% K 2 O, and 1.1-1.4% Na 2 O, with K 2 O/Na 2 O = 0.7-0.8. This K 2 O content and K 2 O/Na 2 O ratio are significantly higher than inferred in studies of melt inclusions in augite in Nakhla by experimental rehomogenization. PTL aug was saturated only with augite, and in equilibrium with augite cores of mg# 62. PTL aug represents the Nakhla parent magma, and does not evolve to PTL oliv by fractional crystallization. We therefore conclude that olivine cores in Nakhla (and, by extension, other nakhlites) are xenocrystic. We propose that PTL oliv and PTL aug were generated from the same source region. PTL oliv was generated first and emplaced to form olivine-rich cumulate rocks. Shortly thereafter, PTL aug was generated and ascended through these olivine-rich cumulates, incorporating fragments of wallrock that became the xenocrystic olivine cores in Nakhla. The Nakhla (nakhlite) mantle source region was pyroxenitic with some olivine, and could have become enriched in K relative to Na via metasomatism. A high degree of melting of this source produced the silica-poor, alkali-rich magma PTL oliv . Further ascension and decompression of the source led to generation of the silica-rich, relatively alkali-poor magma PTL aug . Potassium-rich magmas like those involved in the formation of the nakhlites represent an important part of the diversity of Martian igneous rocks.

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“…On the other hand, it is possible that some or all of the inclusions migrated within the crystal after they were trapped (Sonzogni et al. ). Milman‐Barris et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Melt Inclusions In Olivinementioning

confidence: 99%

K₂O‐rich trapped melt in olivine in the Nakhla meteorite: Implications for petrogenesis of nakhlites and evolution of the Martian mantle

Goodrich

Treiman

Filiberto

et al. 2013

Meteorit & Planetary Scien

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“…To fill this gap, we conducted thermal migration experiments, in which large forsterite crystals immersed into a basaltic liquid were subjected to a lowtemperature gradient (typically, 5-10 °C/mm). In the presence of a thermal gradient, solid-liquid systems are known to undergo dissolution-precipitation processes that contribute to mass transport and can strongly affect the development of cumulates in layered intrusions or the compaction of partially molten rocks (Lesher and Walker 1988;Schiano et al 2006;Sonzogni et al 2011). At a smaller scale, a thermal gradient can cause the migration of a melt inclusion in its host crystal (Lesher and Walker 1988;Schiano et al 2006;Sonzogni et al 2011).…”

Section: U N C O R R E C T E D P R O O F Introductionmentioning

confidence: 99%

“…In the presence of a thermal gradient, solid-liquid systems are known to undergo dissolution-precipitation processes that contribute to mass transport and can strongly affect the development of cumulates in layered intrusions or the compaction of partially molten rocks (Lesher and Walker 1988;Schiano et al 2006;Sonzogni et al 2011). At a smaller scale, a thermal gradient can cause the migration of a melt inclusion in its host crystal (Lesher and Walker 1988;Schiano et al 2006;Sonzogni et al 2011). Figure 1 illustrates the concept of thermal migration (Buchwald et al 1985;Lesher and Walker 1988;Walker and Agee 1988) and how it was adapted in our experimental study.…”

Section: U N C O R R E C T E D P R O O F Introductionmentioning

confidence: 99%

An experimental study of dissolution and precipitation of forsterite in a thermal gradient: implications for cellular growth of olivine phenocrysts in basalt and melt inclusion formation

Laumonier

Laporte

Fauré

et al. 2019

Contrib Mineral Petrol

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The morphology of crystals in magmas strongly depends on the temperature regime of the system, in particular the degree of undercooling and the cooling rate. To simulate low degrees of undercooling, we developed a new experimental setup based on thermal migration, in which large cylinders of forsterite (single crystals) immersed in haplobasaltic melt were subjected to a temperature gradient. As forsterite solubility is sensitive to temperature, the forsterite on the high-temperature side undergoes dissolution and the dissolved components are transported toward the low-temperature side where a layer of newly grown forsterite forms (up to 340 μm thick after 101 h). A striking feature is that the precipitation process does not produce a planar front of forsterite advancing at the expense of liquid: the growth front shows a fingered outline in planar section, with solid lobes separated by glass tubes that are perpendicular to the growth front. We ascribe this texture to cellular growth, a type of growth that had not been experimentally produced so far in silicate systems. We find that the development of cellular growth requires low degrees of undercooling (a few °C) and large crystal-liquid interfaces (~ 1 mm across or more), and that it occurs at a growth rate of the order of 10 −9 m/s. We found natural occurrences of cellular growth on the rims of olivines from basanites, but otherwise cellular textures are poorly documented in natural volcanic rocks. Melt inclusions were produced in our experiments, showing that they can form in olivine at relatively slow rates of growth (10 −9 m/s or lower).

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“…Ultra-calcic compositions from arc settings are silica-poor (SiO 2 as low as 44 wt.%), alkalirich (Na 2 O + K 2 O N 3 and up to 7 wt.% for the potassic varieties) and ne-normative. They have very elevated CaO contents (up to 18 wt.%) and very high CaO/Al 2 O 3 ratios (N 1.0 and up to 1.6) at moderately high MgO concentrations (8-10 wt.%; compositional data from Schiano et al, 2000;Médard et al, 2004Médard et al, , 2006Schiano et al, 2006;Mercier et al, 2010;Sonzogni et al, 2010;Rose-Koga et al, 2012;Chen et al, 2013;Fig 2). Liquids with characteristics as above cannot be produced by partial melting of common lherzolitic mantle and their origin is the subject of active research (e.g., Kogiso and Hirschmann, 2001;Green et al, 2004;Schmidt et al, 2004;Médard et al, 2004Médard et al, , 2006Georgiev et al, 2009;Marchev et al, 2009;Sorbadere et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Origin of primitive ultra-calcic arc melts at crustal conditions — Experimental evidence on the La Sommata basalt, Vulcano, Aeolian Islands

Lanzo

Carlo

Pichavant

et al. 2016

Journal of Volcanology and Geothermal Research

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International audienceTo interpret primitive magma compositions in the Aeolian arc and contribute to a better experimental characterization of ultra-calcic arc melts, equilibrium phase relations have been determined experimentally for the La Sommata basalt (Som-1, Vulcano, Aeolian arc). Som-1 (Na2O + K2O = 4.46 wt.%, CaO = 12.97 wt.%, MgO = 8.78 wt.%, CaO/Al2O3 = 1.03) is a reference primitive ne-normative arc basalt with a strong ultra-calcic affinity. The experiments have been performed between 44 and 154 MPa, 1050 and 1150 °C and from NNO + 0.2 to NNO + 1.9. Fluid-present conditions were imposed with H2O–CO2 mixtures yielding melt H2O concentrations from 0.7 to 3.5 wt.%. Phases encountered include clinopyroxene, olivine, plagioclase and Fe-oxide. Clinopyroxene is slightly earlier than olivine in the crystallization sequence. It is the liquidus phase at 150 MPa, being joined by olivine on the liquidus between 44 and 88 MPa. Plagioclase is the third phase to appear in the crystallization sequence and orthopyroxene was not found. Experimental clinopyroxenes (Fs7–16) and olivines (Fo78–92) partially reproduce the natural phenocryst compositions (respectively Fs5–7 and Fo87–91). Upon progressive crystallization, experimental liquids shift towards higher SiO2 (up to ~ 55 wt.%), Al2O3 (up to ~ 18 wt.%) and K2O (up to ~ 5.5 wt.%) and lower CaO, MgO and CaO/Al2O3. Experimental glasses and natural whole-rock compositions overlap, indicating that progressive crystallization of Som-1 type melts can generate differentiated compositions such as those encountered at Vulcano. The low pressure cotectic experimental glasses reproduce glass inclusions in La Sommata clinopyroxene but contrast with glass inclusions in olivine which preserve basaltic melts more primitive than Som-1. Phase relations for the La Sommata basalt are identical in all critical aspects to those obtained previously on a synthetic ultra-calcic arc composition. In particular, clinopyroxene + olivine co-saturation occurs at very low pressures (≤ 100 MPa). Ultra-calcic arc compositions do not represent primary mantle melts but result from the interaction between a primary mantle melt and clinopyroxene-bearing rocks in the arc crust. At Vulcano, primitive ultra-calcic end-member melts were generated between 250 and 350 MPa in the lower magma accumulation zone by reaction between hot primitive melts and wehrlitic or gabbroic lithologies. At Stromboli, golden pumices and glass inclusions with an ultra-calcic affinity were also generated at shallow pressures, between 150 and 250 MPa, suggesting that the interaction model is of general significance in the Aeolian arc

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Transcrystalline melt migration in clinopyroxene

Abstract: International audienc

Cited by 5 publications

References 23 publications

K₂O‐rich trapped melt in olivine in the Nakhla meteorite: Implications for petrogenesis of nakhlites and evolution of the Martian mantle

K₂O‐rich trapped melt in olivine in the Nakhla meteorite: Implications for petrogenesis of nakhlites and evolution of the Martian mantle

An experimental study of dissolution and precipitation of forsterite in a thermal gradient: implications for cellular growth of olivine phenocrysts in basalt and melt inclusion formation

Origin of primitive ultra-calcic arc melts at crustal conditions — Experimental evidence on the La Sommata basalt, Vulcano, Aeolian Islands

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Transcrystalline melt migration in clinopyroxene

Abstract: International audienc

Cited by 5 publications

References 23 publications

K2O‐rich trapped melt in olivine in the Nakhla meteorite: Implications for petrogenesis of nakhlites and evolution of the Martian mantle

K2O‐rich trapped melt in olivine in the Nakhla meteorite: Implications for petrogenesis of nakhlites and evolution of the Martian mantle

An experimental study of dissolution and precipitation of forsterite in a thermal gradient: implications for cellular growth of olivine phenocrysts in basalt and melt inclusion formation

Origin of primitive ultra-calcic arc melts at crustal conditions — Experimental evidence on the La Sommata basalt, Vulcano, Aeolian Islands

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K₂O‐rich trapped melt in olivine in the Nakhla meteorite: Implications for petrogenesis of nakhlites and evolution of the Martian mantle

K₂O‐rich trapped melt in olivine in the Nakhla meteorite: Implications for petrogenesis of nakhlites and evolution of the Martian mantle