The solubility of titanite in silicate melt determined from growth and dissolution experiments

Ayers, John C.; Flanagan, D. M.; Miller, Calvin F.; Watson, E. Bruce; Ryerson, Frederick J.; Wallrich, Blake M.; Ackerson, Michael R.

doi:10.1007/s00410-022-01902-z

Cited by 8 publications

(3 citation statements)

References 53 publications

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“…This higher content in transition metal oxides is likely to be responsible for the stronger tendency of Mt. Etna trachybasalt toward nanocrystallization: although these components can be assumed to be homogeneously distributed in the stable melt, their solubility in the undercooled liquid is strongly temperaturedependent and is additionally affected by changes in oxygen fugacity [156][157][158][159][160][161][162] . A sufficiently long dwell at medium-to-deep undercooling can therefore induce nucleation and growth of Fe-Ti-oxide crystals simply due to their melt oversaturation, which will ultimately be more pronounced in a FeO-and TiO 2 -richer melt.…”

Section: Resultsmentioning

confidence: 99%

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Scarani

Zandonà

Fiore

et al. 2022

Commun Earth Environ

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An increasing number of studies are being presented demonstrating that volcanic glasses can be heterogeneous at the nanoscale. These nano-heterogeneities can develop both during viscosity measurements in the laboratory and during magma eruptions. Our multifaceted study identifies here total transition metal oxide content as a crucial compositional factor governing the tendency of basalt melts and glasses towards nanolitization: at both anhydrous and hydrous conditions, an undercooled trachybasalt melt from Mt. Etna readily develops nanocrystals whose formation also hampers viscosity measurements, while a similar but FeO- and TiO2-poorer basalt melt from Stromboli proves far more stable at similar conditions. We therefore outline a procedure to reliably derive pure liquid viscosity without the effect of nanocrystals, additionally discussing how subtle compositional differences may contribute to the different eruptive styles of Mt. Etna and Stromboli.

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Section: Resultsmentioning

confidence: 99%

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Scarani

Zandonà

Fiore

et al. 2022

Commun Earth Environ

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“…This relationship is consistent with mafic melts ability to dissolve zircon inherited from other rocks 45 . While there are numerous factors expected to influence zircon survivorship versus its dissolution in silicate liquids, generally a mafic magma would dissolve (inherited) zircon more efficiently than (neoblastic) titanite 45,46 . Hence, encapsulating zircon within a titanite armour, which is more geochemically stable in the dyke magma, may explain the retention of older zircon as inclusions in titanite, which have been lost from the matrix.…”

Section: Discussionmentioning

confidence: 99%

Cryptic geological histories accessed through entombed and matrix geochronometers in dykes

Kirkland,

Dröllner,

Quentin de Gromard

et al. 2024

Commun Earth Environ

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Deep geology of ancient continental crust can be difficult to access, with direct observation restricted to limited exposures. The age and composition of hidden geology can be gleaned from indirect isotopic modelling or via detrital minerals within overlying basins. Here we present an alternative, where direct grain sampling of ancient components within the South West Terrane, Yilgarn Craton, by a Proterozoic dyke evidences deep intact, or detritus from, Paleoarchean crust. U–Pb geochronology on this dyke reveals c. 3440 Ma zircon inclusions within titanite. This zircon was protected from overprinting fluids that obliterated unshielded crystals. Similar ancient zircon is present within recent sediment from the Swan-Avon river, which drains the terrane. The most parsimonious interpretation is that the dyke is 1390 Ma. Sequential overprinting is also recorded, with titanite preserving primary crystallization and c. 1000 Ma Pinjarra Orogeny-related overprinting. In contrast, apatite preserves c. 210 Ma ages, correlated with denudation of sedimentary cover.

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“…Titanite + magnetite + quartz mineral assemblage with orthopyroxene and/or amphibole indicates relatively high oxygen fugacities than those of ilmenite+clinopyroxene (Xirouchakis & Lindsley, 1998). In fact, Ayers et al (2022) demonstrated that early‐formed ilmenites can be re‐dissolved with the loss of iron and with decreasing temperature can be replaced by titanites. Alternatively, magmatic titanites can also break down to ilmenites in response to late‐stage fluid activity, associated with high fO 2 during the sub‐solidus cooling (Broska et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Origin and evolution of vanadium‐rich oxide and titanite phases in lamprophyre and mafic dykes from the Nuapada diamondiferous Lamproite field, BastarCraton‐EasternGhats Mobile belt contact, India: Metallogenic and geodynamic implications

2023

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Transitional boundaries of the craton and mobile belt mark diverse and long-term tectono-thermal events like hot and cold lithospheric contact, back-arc-type subduction, and also constitute a favourable locale for metallogeny. The exact nature and origin of such metallogenic enrichment in the lithospheric mantle source beneath contact zones are still uncertain. The contact of Bastar Craton and the Eastern Ghat Mobile Belt (EGMB), India, provides an ideal geological setup to study the metallogenic enrichment processes. In this study, we present a detailed petrographic and mineralogical investigation of various iron oxide phases and titanites in spatially and temporally distinct lamprophyre and mafic dykes from the diamondiferous Nuapada Lamproite Field (NLF) at the contact between Bastar Craton and EGMB. Diverse textural assemblages of oxides, namely, trellis, sandwich-type exsolutions and reaction-replacement, are widespread. Ilmenites, magnetites and titanites from the mafic dykes as well as lamprophyre exhibit an anomalous enrichment of vanadium (V 2 O 3 up to 3.7 wt%), whereas ilmenites are also characterized by their elevated manganese content (MnO up to 3.8 wt%). Mineral chemistry-based plots and thermo-oximetric studies suggest the magmatic origin of iron oxides belonging to the Fe-Ti-V-type ore in which partitioning and sequestration of the elements were controlled by differential crystallization, exsolution and fractionation rather than any imprints of contamination. Multiphase sequestration of vanadium as well as manganese in lamprophyre and mafic dykes, separated in space as well in relative depths of origin, signifies the presence of a fertile mantle. The role of subductionderived metasomatized fluids as a causative factor of vanadium metallogeny in this domain is evaluated. Low-Mg and high-Mn ilmenites of this study are consistent with the reported occurrences of diamonds from the NLF and adjoining areas of the Bastar Craton.

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The solubility of titanite in silicate melt determined from growth and dissolution experiments

Cited by 8 publications

References 53 publications

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

A chemical threshold controls nanocrystallization and degassing behaviour in basalt magmas

Cryptic geological histories accessed through entombed and matrix geochronometers in dykes

Origin and evolution of vanadium‐rich oxide and titanite phases in lamprophyre and mafic dykes from the Nuapada diamondiferous Lamproite field, BastarCraton‐EasternGhats Mobile belt contact, India: Metallogenic and geodynamic implications

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