Nicola Richmond
IGPP 

Estimating the age and origin of crustal magnetic anomalies and high
albedo swirls antipodal to lunar impact basins

ABSTRACT

Previous work has shown that the strongest concentrations of lunar
crustal magnetic anomalies are located antipodal to four large,
similarly aged impact basins (Orientale, Serenitatis, Imbrium and
Crisium). Here, we report results of a correlation study between
magnetic anomaly clusters and geology in areas antipodal to Imbrium,
Orientale and Crisium. Unusual geologic terranes, interpreted to be of
seismic or ejecta origin associated with the antipodal basins, have
been mapped antipodal to both Orientale and Imbrium. All three antipode
regions have many high albedo swirl markings. Results will be used to
(1) identify possible source materials and estimate the age of the
anomalies, (2) consider the origin of the antipode terranes, (3)
determine the origin of the high albedo swirls and (4) reflect on the
dating of a former lunar core dynamo.