Cooling rates of basaltic hyaloclastites and pillow lava glasses from the HSDP2 drill core

Nichols, A. R.; Potužák, Marcel; Dingwell, Donald B.

doi:10.1016/j.gca.2008.11.023

Cited by 44 publications

(37 citation statements)

References 50 publications

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“…Below, we show that the interpretation of our results within the framework of the glass transition theory (e.g. Dingwell and Webb 1990;Behrens and Nowak 2003;Gottsmann et al 2002;Giordano et al 2005;Potuzak et al 2008;Nichols et al 2009) allows to evaluate to what extent our hydrous mafic melt compositions preserve their high temperature speciation upon quench. The approach uses recent advances in the field of silicate melt viscosities (Giordano et al 2008).…”

Section: Water Speciation In Basaltic Liquids/meltsmentioning

confidence: 83%

“…Dixon et al 1995;Dixon 1997) and those made in the laboratory shows that both preserve broadly similar speciation patterns (e.g. Nichols et al 2009), suggesting similar quenching rates. This suggests that any structural response (relaxation) of hydrous basalt melts upon cooling is an exceedingly fast process, with the implication that high temperature H-bearing species proportions are virtually not quenchable using conventional laboratory techniques.…”

Section: Tg Is Determined From the Model Of Giordano Et Al (2008)mentioning

confidence: 84%

“…Nichols et al 2009). For instance, Stevenson et al (1995), Zhang et al (1997) and Toplis et al (2001) used different values, which yield one log unit of difference in the viscosity calculation.…”

Section: Water Speciation In Basaltic Liquids/meltsmentioning

confidence: 99%

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The H2O solubility of alkali basaltic melts: an experimental study

Lesne

Scaillet

Pichavant

et al. 2010

Contrib Mineral Petrol

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The H2O solubility of alkali basaltic melts: an experimental study. Contributions to Mineralogy and Petrology, Springer Verlag, 2011, 162 (1) Our results show that at pressures above 1 kbar, alkali basalts dissolve more water than typical mid-ocean ridge basalts (MORB). Combination of our data with those from previous studies allows the following simple empirical model for the water solubility of basalts of varying alkalinity and fO 2 to be derived:where H 2 O MORB is the water solubility at the calculated P, using the model of Dixon et al. (1995). This equation reproduces the existing database on water solubilities in basaltic melts to within 5%. Interpretation of the speciation data in the context of the glass transition theory shows that water speciation in basalt melts is severely modified during quench. At magmatic temperatures, more than 90% of dissolved water forms hydroxyl groups at all water contents, whilst in natural or synthetic glasses, the amount of molecular water is much larger. A regular solution model with an explicit temperature dependence reproduces well-observed water species. Derivation of the partial molar volume of molecular water using standard thermodynamic considerations yields values close to previous findings if room temperature water species are used. When high temperature species proportions are used, a negative partial molar volume is obtained for molecular water. Calculation of the partial molar volume of total water using H 2 O solubility data on basaltic melts at pressures above 1 kbar yields a value of 19 cm 3 /mol in reasonable agreement with estimates obtained from density measurements.

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Section: Water Speciation In Basaltic Liquids/meltsmentioning

confidence: 83%

Section: Tg Is Determined From the Model Of Giordano Et Al (2008)mentioning

confidence: 84%

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The H2O solubility of alkali basaltic melts: an experimental study

Lesne

Scaillet

Pichavant

et al. 2010

Contrib Mineral Petrol

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“…The morphology of the dense particles is strongly suggestive of quench granulation (Honnorez and Kirst 1975;Büttner et al 1999). Quench granulation is not depth-limited (Kokelaar 1986), and its particles in other studies have shown DSC signatures indicating complex cooling histories (Nichols et al 2009). Quench granulation may partly facilitate hydrovolcanic limu bubble formation by cracking the quenched glassy rinds on lava surfaces, exposing hot, incandescent melt that may act as sites for rapid limu bubble expansion.…”

Section: Quench Granulationmentioning

confidence: 90%

No depth limit to hydrovolcanic limu o Pele: analysis of limu from Lō`ihi Seamount, Hawai`i

Schipper

White

2009

Bull Volcanol

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Deep-sea limu o Pele are shards of basaltic glass commonly described as "bubble walls." When first identified they were inferred to form in submarine fire fountains, but were then reinterpreted as the products of hydrovolcanic volcanism, formed when submarine lava flows entrapped and vaporised seawater. Limu discovered below the c 3 km critical depth of seawater, where superheated water exists as a supercritical fluid instead of a vapour, led to the hydrovolcanic model of limu o Pele formation being discarded in favour of a magmatic CO 2 -driven, "strombolian-like" model. This revised magmatic mechanism has been widely accepted by the scientific community. We describe a newly discovered limu o Pele-rich deposit at~1,052 mbsl on the northeast summit plateau region of Lō`ihi Seamount, Hawai`i. The limu at this site is concentrated in a chemically monomict ash lens interbedded with thin lava sheets that are separated from overlying volcaniclastic material by a discontinuity. The geometry and geochemistry of the deposit provide compelling evidence for a hydrovolcanic, sheet flow-related origin. The exceptional abundance and preservation of limu at this site allows 4 morphologic subtypes of limu-thin film, plateau-border, convex film, and Pele's hair-to be identified and linked to portions of the isolated rupturing bubbles from which they are derived. We extend our discussion to beyond this new Lō`ihi deposit, by including a review of limu o Pele occurrences and thermodynamic considerations that demonstrate the hydrovolcanic model of limu formation to be more tenable than the magmatic model at all depths, including below the critical depth of seawater.

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“…[] of Hawaiian pahoehoe crusts (0.1–

2 K s^{- 1}

) and Nichols et al . [] of pillow lavas (2–

50 K s^{- 1}

). For Laki lava samples, it is also useful to consider a much slower cooling interval during days of residence in flowing lava prior to quench in pahoehoe lobes, perhaps of as little as

3 \times 10^{- 6} K s^{- 1}

.…”

Section: A Model Of P‐v‐t‐x Evolution In Olivine‐hosted Melt Inclusionsmentioning

confidence: 99%

Bubble formation and decrepitation control theCO₂content of olivine‐hosted melt inclusions

Maclennan

2017

Geochem Geophys Geosyst

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The CO 2 contents of olivine-hosted melt inclusions have previously been used to constrain the depth of magma chambers in basaltic systems. However, the vast majority of inclusions have CO 2 contents which imply entrapment pressures that are significantly lower than those obtained from independent petrological barometers. Furthermore, a global database of melt inclusion compositions from low H 2 O settings, indicates that the distribution of saturation pressures varies surprisingly little between mid-ocean ridges, ocean islands, and continental rift zones. 95% of the inclusions in the database have saturation pressures of 200 MPa or less, indicating that melt inclusion CO 2 does not generally provide an accurate estimate of magma chamber depths. A model of the P-V-T-X evolution of olivine-hosted melt inclusions was developed so that the properties of the inclusion system could be tracked as the hosts follow a model P-T path. The models indicate that the principal control on the saturation of CO 2 in the inclusion and the formation of vapor bubbles is the effect of postentrapment crystallization on the major element composition of the inclusions and how this translates into variation in CO 2 solubility. The pressure difference between external melt and the inclusion is likely to be sufficiently high to cause decrepitation of inclusions in most settings. Decrepitation can account for the apparent mismatch between CO 2 -based barometry and other petrological barometers, and can also account for the observed global distribution of saturation pressures. Only when substantial postentrapment crystallization occurs can reconstructed inclusion compositions provide an accurate estimate of magma chamber depth.

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Cooling rates of basaltic hyaloclastites and pillow lava glasses from the HSDP2 drill core

Cited by 44 publications

References 50 publications

The H2O solubility of alkali basaltic melts: an experimental study

The H2O solubility of alkali basaltic melts: an experimental study

No depth limit to hydrovolcanic limu o Pele: analysis of limu from Lō`ihi Seamount, Hawai`i

Bubble formation and decrepitation control theCO₂content of olivine‐hosted melt inclusions

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Cooling rates of basaltic hyaloclastites and pillow lava glasses from the HSDP2 drill core

Cited by 44 publications

References 50 publications

The H2O solubility of alkali basaltic melts: an experimental study

The H2O solubility of alkali basaltic melts: an experimental study

No depth limit to hydrovolcanic limu o Pele: analysis of limu from Lō`ihi Seamount, Hawai`i

Bubble formation and decrepitation control theCO2content of olivine‐hosted melt inclusions

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Bubble formation and decrepitation control theCO₂content of olivine‐hosted melt inclusions