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Caldera Collapse and Volcanic Resurfacing in Arabia Terra Provide Hints of Vast Under‐Recognized Early Martian Volcanism
Author(s) -
Chu Yin Yau Yoyo,
Michalski Joseph R.,
Wright Shawn P.,
Webb A. Alexander G.
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2021gl093118
Subject(s) - caldera , geology , pyroclastic rock , volcano , volcanism , martian , earth science , shield volcano , lava , mars exploration program , crust , volcanology , geochemistry , astrobiology , paleontology , tectonics , physics
Arabia Terra is an ancient, geologically complex region of Mars. It is not typically described as volcanic because it lacks prominent, easily recognizable shield volcanoes. However, Arabia Terra contains flood lavas and widespread layered materials that might represent airfall pyroclastics from unknown sources. Here we explore the geology of some complex topographic depressions in Arabia Terra previously hypothesized to represent collapse features termed “plains style caldera complexes,” an enigmatic category of volcanic feature on Mars characterized by surface collapse rather than construction of topographic shields. Geomorphological observations and geologic mapping carried out here support a volcanic origin of these features, providing a possible source for volcaniclastic sediments. The identification of caldera complexes in Arabia Terra raises the questions of how they are linked to the geotectonic setting of the region and whether similar features might be much more abundant in the ancient Martian crust than is currently recognized.