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\begin{document}

\title{New observations of recently active wrinkle ridges in the lunar mare:
Implications for the timing and origin of lunar tectonics}



\author[1]{Cole A Nypaver}%
\author[1]{Bradley J Thomson}%
\affil[1]{University of Tennessee}%


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  \date{May 27, 2024}


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\begin{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 (\textless{}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
\textasciitilde{}90\% of nearside mare basins -- occurring in clusters
of \textasciitilde{}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.%
\end{abstract}%



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