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    Rights statement: Accepted for publication in Journal of Geophysical Research: Planets. Copyright 2019 American Geophysical Union. Further reproduction or electronic distribution is not permitted. Qiao, L., Head, J. W., Ling, Z., Wilson, L., Xiao, L., Dufek, J. D., & Yan, J. ( 2019). Geological characterization of the Ina shield volcano summit pit crater on the Moon: Evidence for extrusion of waning‐stage lava lake magmatic foams and anomalously young crater retention ages. Journal of Geophysical Research: Planets, 124, 1100– 1140. https://doi.org/10.1029/2018JE005841

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Geological Characterization of the Ina Shield Volcano Summit Pit Crater on the Moon: Evidence for Extrusion of Waning-Stage Lava Lake Magmatic Foams and Anomalously Young Crater Retention Ages

Research output: Contribution to journalJournal article

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  • L. Qiao
  • J.W. Head
  • Z. Ling
  • L. Wilson
  • L. Xiao
  • J.D. Dufek
  • J. Yan
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<mark>Journal publication date</mark>1/05/2019
<mark>Journal</mark>Journal of Geophysical Research: Planets
Issue number4
Volume124
Number of pages41
Pages (from-to)1100-1140
Publication statusPublished
Early online date29/04/19
Original languageEnglish

Abstract

Ina, a distinctive ~2 × 3 km D-shaped depression, is composed of unusual bulbous-shaped mounds surrounded by optically immature hummocky/blocky floor units. The crisp appearance, optical immaturity, and low number of superposed impact craters combine to strongly suggest a geologically recent formation for Ina, but the specific formation mechanism remains controversial. We reconfirm that Ina is a summit pit crater/vent on a small shield volcano ~3.5 billion years old. Following detailed characterization, we interpret the range of Ina characteristics to be consistent with a two-component model of origin during the waning stages of summit pit eruption activities. The Ina pit crater floor is interpreted to be dominated by the products of late-stage, low-rise rate magmatic dike emplacement. Magma in the dike underwent significant shallow degassing and vesicle formation, followed by continued degassing below the solidified and highly microvesicular and macrovesicular lava lake crust, resulting in cracking of the crust and extrusion of gas-rich magmatic foams onto the lava lake crust to form the mounds. These unique substrate characteristics (highly porous aerogel-like foam mounds and floor terrains with large vesicles and void space) exert important effects on subsequent impact crater characteristics and populations, influencing (1) optical maturation processes, (2) regolith development, and (3) landscape evolution by modifying the nature and evolution of superposed impact craters and thus producing anomalously young crater retention ages. Accounting for these effects results in a shift of crater size-frequency distribution model ages from

Bibliographic note

Accepted for publication in Journal of Geophysical Research: Planets. Copyright 2019 American Geophysical Union. Further reproduction or electronic distribution is not permitted. Qiao, L., Head, J. W., Ling, Z., Wilson, L., Xiao, L., Dufek, J. D., & Yan, J. ( 2019). Geological characterization of the Ina shield volcano summit pit crater on the Moon: Evidence for extrusion of waning‐stage lava lake magmatic foams and anomalously young crater retention ages. Journal of Geophysical Research: Planets, 124, 1100– 1140. https://doi.org/10.1029/2018JE005841