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New observations of recently active wrinkle ridges in the lunar mare: Implications for the timing and origin of lunar tectonics
  • Cole A Nypaver,
  • Bradley J Thomson
Cole A Nypaver
University of Tennessee

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Bradley J Thomson
University of Tennessee
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Abstract

The variety of tectonic features on the Moon indicates that the lunar lithosphere has undergone a complex deformational history. Lobate scarps and wrinkle ridges are two such tectonic features that have resulted from compressional stresses. The crisp morphologies and cross cutting relations associated with a global population of lobate scarps have been cited as evidence for their recent (<50 Ma) formation, but observations of recently active wrinkle ridges have yet to be made on a similar scale. Here, we present new observations of 1,127 recently active wrinkle ridge segments on the lunar nearside mare. Our results indicate that recently active wrinkle ridges are distributed across ~90% of nearside mare basins – occurring in clusters of ~10–100 ridge segments with a mean segment length of 4.4 km. The magnitudes and orientations of these recently active wrinkle ridges are consistent with the hypothesis of formation by orbital recession stresses.
16 Sep 2022Published in Geophysical Research Letters volume 49 issue 17. 10.1029/2022GL098975