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    Rights statement: This is the author’s version of a work that was accepted for publication in Journal of Volcanology and Geothermal Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Volcanology and Geothermal Research, 374, 2019 DOI: 10.1016/j.jvolgeores.2019.02.018

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A theoretical model for the formation of Ring Moat Dome Structures: Products of second boiling in lunar basaltic lava flows

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A theoretical model for the formation of Ring Moat Dome Structures : Products of second boiling in lunar basaltic lava flows. / Wilson, L.; Head, J.W.; Zhang, F.

In: Journal of Volcanology and Geothermal Research, Vol. 374, 01.04.2019, p. 160-180.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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Wilson, L. ; Head, J.W. ; Zhang, F. / A theoretical model for the formation of Ring Moat Dome Structures : Products of second boiling in lunar basaltic lava flows. In: Journal of Volcanology and Geothermal Research. 2019 ; Vol. 374. pp. 160-180.

Bibtex

@article{ae32d13be53a4881bf5ac917f2e519c9,
title = "A theoretical model for the formation of Ring Moat Dome Structures: Products of second boiling in lunar basaltic lava flows",
abstract = "Newly documented Ring Moat Dome Structures (RMDSs), low mounds typically several hundred meters across with a median height of ~3.5 m and surrounded by moats, occur in the lunar maria. They appear to have formed synchronously with the surrounding mare basalt deposits. It has been hypothesized that they formed on the surfaces of lava flows by the extrusion of magmatic foams generated in the flow interiors as the last stage of the eruption and flow emplacement process. We develop a theoretical model for the emplacement and cooling of mare basalts in which the molten cores of cooling flows are inflated during the late stages of eruptions by injection of additional hot lava containing dissolved volatiles. Crystallization of this lava causes second boiling (an increase in vapor pressure to the point of supersaturation due to crystallization of the melt), generating copious quantities of vesicles (magmatic foam layers) at the top and bottom of the central core of the flow. Flow inflation of many meters is predicted to accompany the formation of the foam layers, flexing the cooled upper crustal layer, and forming fractures that permit extrusions of the magmatic foams onto the surface to form domes, with subsidence of the subjacent and surrounding surface forming the moats. By modeling the evolution of the internal flow structure we predict the properties of RMDSs and the conditions in which they are most likely to form. We outline several tests of this hypothesis.",
keywords = "Lava flow inflation, Lunar basaltic lava, Ring Moat Dome Structure, Second boiling, Basalt, Extrusion, Moon, Basaltic lava, Basaltic lava flow, Central core, Cooling flows, Dome structure, Internal flow structure, Lava flows, Theoretical modeling, Domes",
author = "L. Wilson and J.W. Head and F. Zhang",
note = "This is the author{\textquoteright}s version of a work that was accepted for publication in Journal of Volcanology and Geothermal Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Volcanology and Geothermal Research, 374, 2019 DOI: 10.1016/j.jvolgeores.2019.02.018",
year = "2019",
month = apr,
day = "1",
doi = "10.1016/j.jvolgeores.2019.02.018",
language = "English",
volume = "374",
pages = "160--180",
journal = "Journal of Volcanology and Geothermal Research",
issn = "0377-0273",
publisher = "Elsevier Science B.V.",

}

RIS

TY - JOUR

T1 - A theoretical model for the formation of Ring Moat Dome Structures

T2 - Products of second boiling in lunar basaltic lava flows

AU - Wilson, L.

AU - Head, J.W.

AU - Zhang, F.

N1 - This is the author’s version of a work that was accepted for publication in Journal of Volcanology and Geothermal Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Volcanology and Geothermal Research, 374, 2019 DOI: 10.1016/j.jvolgeores.2019.02.018

PY - 2019/4/1

Y1 - 2019/4/1

N2 - Newly documented Ring Moat Dome Structures (RMDSs), low mounds typically several hundred meters across with a median height of ~3.5 m and surrounded by moats, occur in the lunar maria. They appear to have formed synchronously with the surrounding mare basalt deposits. It has been hypothesized that they formed on the surfaces of lava flows by the extrusion of magmatic foams generated in the flow interiors as the last stage of the eruption and flow emplacement process. We develop a theoretical model for the emplacement and cooling of mare basalts in which the molten cores of cooling flows are inflated during the late stages of eruptions by injection of additional hot lava containing dissolved volatiles. Crystallization of this lava causes second boiling (an increase in vapor pressure to the point of supersaturation due to crystallization of the melt), generating copious quantities of vesicles (magmatic foam layers) at the top and bottom of the central core of the flow. Flow inflation of many meters is predicted to accompany the formation of the foam layers, flexing the cooled upper crustal layer, and forming fractures that permit extrusions of the magmatic foams onto the surface to form domes, with subsidence of the subjacent and surrounding surface forming the moats. By modeling the evolution of the internal flow structure we predict the properties of RMDSs and the conditions in which they are most likely to form. We outline several tests of this hypothesis.

AB - Newly documented Ring Moat Dome Structures (RMDSs), low mounds typically several hundred meters across with a median height of ~3.5 m and surrounded by moats, occur in the lunar maria. They appear to have formed synchronously with the surrounding mare basalt deposits. It has been hypothesized that they formed on the surfaces of lava flows by the extrusion of magmatic foams generated in the flow interiors as the last stage of the eruption and flow emplacement process. We develop a theoretical model for the emplacement and cooling of mare basalts in which the molten cores of cooling flows are inflated during the late stages of eruptions by injection of additional hot lava containing dissolved volatiles. Crystallization of this lava causes second boiling (an increase in vapor pressure to the point of supersaturation due to crystallization of the melt), generating copious quantities of vesicles (magmatic foam layers) at the top and bottom of the central core of the flow. Flow inflation of many meters is predicted to accompany the formation of the foam layers, flexing the cooled upper crustal layer, and forming fractures that permit extrusions of the magmatic foams onto the surface to form domes, with subsidence of the subjacent and surrounding surface forming the moats. By modeling the evolution of the internal flow structure we predict the properties of RMDSs and the conditions in which they are most likely to form. We outline several tests of this hypothesis.

KW - Lava flow inflation

KW - Lunar basaltic lava

KW - Ring Moat Dome Structure

KW - Second boiling

KW - Basalt

KW - Extrusion

KW - Moon

KW - Basaltic lava

KW - Basaltic lava flow

KW - Central core

KW - Cooling flows

KW - Dome structure

KW - Internal flow structure

KW - Lava flows

KW - Theoretical modeling

KW - Domes

U2 - 10.1016/j.jvolgeores.2019.02.018

DO - 10.1016/j.jvolgeores.2019.02.018

M3 - Journal article

VL - 374

SP - 160

EP - 180

JO - Journal of Volcanology and Geothermal Research

JF - Journal of Volcanology and Geothermal Research

SN - 0377-0273

ER -