Cooling of an igneous dike 20 yr after intrusion

Connor, Charles B.; Lichtner, Peter C.; Conway, F. Michael; Hill, Brittain E.; Ovsyannikov, A. A.; Federchenko, I.; Doubik, Yu; Shapar, V. N.; Taran, Yuri

doi:10.1130/0091-7613(1997)025<0711:coaidy>2.3.co;2

Cited by 24 publications

(11 citation statements)

References 3 publications

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“…Connor et al . [] use a definition of the bulk thermal diffusivity in deposits that incorporates the differential thermal properties arising from significant gas volume fraction ϕ g

κ = \frac{k}{ρ^{m} C_{p}^{m} ((), 1 - ϕ_{g}) + ρ^{f} C_{p}^{f} ϕ_{g}}

where k is the thermal conductivity of the granular packing defined as k = k m [(1 − ϕ g )/(1 + ϕ g )] [ Bagdassarov and Dingwell , ] and where k m is the thermal conductivity of the melt. C p m is the melt specific heat capacity, and ρ m is the melt density.…”

Section: Discussionmentioning

confidence: 99%

“…where r is the spatial position normal to the axis of symmetry of the cylinder from a cylinder surface at R and q is the imposed heating rate. Connor et al [1997] use a definition of the bulk thermal diffusivity in deposits that incorporates the differential thermal properties arising from significant gas volume fraction ϕ g Figure 6. The results of a numerical solution of the 1-D heat equation for conductive heating of (a) an individual sphere in isothermal external conditions and (b) a cylindrical granular packing of spheres with a known initial porosity following the incorporation of porous insulating effects in nonisothermal conditions.…”

Section: Thermal Disequilibrium During Sinteringmentioning

confidence: 99%

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Nonisothermal viscous sintering of volcanic ash

et al. 2014

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Volcanic ash is often deposited in a hot state. Volcanic ash containing glass, deposited above the glass transition interval, has the potential to sinter viscously both to itself (particle‐particle) and to exposed surfaces. Here we constrain the kinetics of this process experimentally under nonisothermal conditions using standard glasses. In the absence of external load, this process is dominantly driven by surface relaxation. In such cases the sintering process is rate limited by the melt viscosity, the size of the particles and the melt‐vapor interfacial tension. We propose a polydisperse continuum model that describes the transition from a packing of particles to a dense pore‐free melt and evaluate its efficacy in describing the kinetics of volcanic viscous sintering. We apply our model to viscous sintering scenarios for cooling crystal‐poor rhyolitic ash using the 2008 eruption of Chaitén volcano as a case example. We predict that moderate linear cooling rates of > 0.1°C min−1 can result in the common observation of incomplete sintering and the preservation of pore networks.

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“…Connor et al . [] use a definition of the bulk thermal diffusivity in deposits that incorporates the differential thermal properties arising from significant gas volume fraction ϕ g

κ = \frac{k}{ρ^{m} C_{p}^{m} ((), 1 - ϕ_{g}) + ρ^{f} C_{p}^{f} ϕ_{g}}

Section: Discussionmentioning

confidence: 99%

Section: Thermal Disequilibrium During Sinteringmentioning

confidence: 99%

Nonisothermal viscous sintering of volcanic ash

et al. 2014

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“…Assimilation of seawater‐derived components into the magma is an important process within shallow magma chambers on submarine volcanoes. During the early stages of shallow magma chamber formation, the maturing magma chamber has not yet dried out the surrounding crust [ Connor et al , 1997], and individual intrusions assimilate various amounts of hydrothermally altered roof rocks as a function of their unique pathway through the volcanic structure [ Kent et al , 1999a]. The assimilation of such altered rocks and either contained brine [ Kent et al , 1999a, 1999b] or salts contaminates the stored magmas with seawater‐derived components, particularly Cl and heavy rare gases [ Patterson et al , 1990; Honda et al , 1993].…”

Section: Extrinsic Effects Of the Hydrosphere And Atmospherementioning

confidence: 99%

Extrinsic controls on the evolution of Hawaiian ocean island volcanoes

Clague

Dixon

2000

Geochem Geophys Geosyst

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[1] Extrinsic parameters that affect the evolution of magmatic systems within and beneath ocean island volcanoes include physical variables such as confining pressure, which controls magma degassing, and temperature of the underlying lithosphere and crust, which controls magma crystallization during ascent. Other extrinsic parameters are environmental variables coupled to the hydrosphere and atmosphere such as hydrothermal circulation systems and even rainfall. All these extrinsic factors interact with intrinsic parameters, such as magma supply rates or composition, to modulate the evolution of magma chambers and the petrologic processes that take place within them.Components: 6607 words, 1 table.

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“…For Φ = 0 and by comparison with measurements from Bagdassarov and Dingwell (), Wadsworth, Vasseur, Llewellin, Genareau, et al () calibrated these two parameters in the range 550–1100°C as D 0 = 1.88 × 10 −7 m 2 /s and α = 1.58 × 10 −3 K −1 . D 0 (Φ) is then given by (see Connor et al, )

D_{0} ((), Φ) = \frac{k ((), Φ)}{ρ C_{p} ((), 1 - normalΦ) + normalΦ ρ_{w} C_{p, w}}

for which k (Φ) = D 0 ρC p (1 − Φ)/(1 + Φ) is the vesicularity‐dependent thermal conductivity (Bagdassarov & Dingwell, ), ρ and ρ w are the melt and water densities respectively, and C p and C p , w are the specific heat capacities. We used ρ = 2,200 kg/m 3 and C p = 1,000 J·kg·K − , and looked at R in the range 5–500 mm and Φ between 0.2 and 0.6.…”

Section: Methodsmentioning

confidence: 99%

Vesiculation and Quenching During Surtseyan Eruptions at Hunga Tonga‐Hunga Ha'apai Volcano, Tonga

et al. 2018

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Surtseyan eruptions are shallow to emergent subaqueous explosive eruptions that owe much of their characteristic behavior to the interaction of magma with water. The difference in thermal properties between water and air affects the cooling and postfragmentation vesiculation processes in magma erupted into the water column. Here we study the vesiculation and cooling processes during the 2009 and 2014-2015 Surtseyan eruptions of Hunga Tonga-Hunga Ha'apai volcano by combining 2-D and 3-D vesicle-scale analyses of lapilli and bombs and numerical thermal modeling. Most of the lapilli and bombs show gradual textural variations from rim to core. The vesicle connectivity in the lapilli and bombs increases with vesicularity from fully isolated to completely connected and also increases from rim to core in transitional clasts. We interpret the gradual textural variations and the connectivity-vesicularity relationships as the result of postfragmentation bubble growth and coalescence interrupted at different stages by quenching in water. The measured vesicle size distributions are bimodal with a population of small and large vesicles. We interpret this bimodality as the result of two nucleation events, one prefragmentation with the nucleation and growth of large bubbles and one postfragmentation with nucleation of small vesicles. We link the thermal model with the textural variations in the clasts-showing a dependence on particle size, Leidenfrost effect, and initial melt temperature. In particular, the cooling profiles in the bombs are consistent with the gradual textural variations from rim to core in the clasts, likely caused by variations in time available for vesiculation before quenching. Wilding et al. Key Points:• Lapilli and bombs from Surtseyan eruptions show gradual textural variations due to the quenching in water • The kinetics of magma cooling during Surtseyan eruptions are influenced by particle size, radial position, and Leidenfrost effect • The 3-D analysis of vesicle metrics using X-ray microtomography allows quantification of the percolation threshold in volcanic rocksSupporting Information:• Supporting Information S1Correspondence to: M. Colombier,

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Cooling of an igneous dike 20 yr after intrusion

Cited by 24 publications

References 3 publications

Nonisothermal viscous sintering of volcanic ash

Nonisothermal viscous sintering of volcanic ash

Extrinsic controls on the evolution of Hawaiian ocean island volcanoes

Vesiculation and Quenching During Surtseyan Eruptions at Hunga Tonga‐Hunga Ha'apai Volcano, Tonga

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