New observations of recently active wrinkle ridges in the lunar mare:
Implications for the timing and origin of lunar tectonics
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.