  We have conducted an extensive towed-magnetic-sled survey during the period
of June 14-28, 2023, over the seafloor about 85 km north of Manus Island, Papua
New Guinea, centered around the calculated path of the bolide CNEOS 2014-01-08
(IM1). We found about 850 spherules of diameter 0.1-1.3 millimeters in our
samples. The samples were analyzed by micro-XRF, Electron Probe Microanalyzer
and ICP Mass spectrometry. Here we report major and trace element compositions
of the samples and classify spherules based on that analysis. We identified 78%
of the spherules as primitive, in that their compositions have not been
affected by planetary differentiation. We divided these into four groups
corresponding to previously described cosmic spherule types. The remaining 22%
appear to all reflect planetary igneous differentiation and are all different
from previously described spherules. We call them D-type spherules. A portion
of the D-spherules show an excess of Be, La and U, by up to three orders of
magnitude relative to the solar system standard of CI chondrites. Detailed mass
spectroscopy of 12 of these BeLaU-type spherules, the population of which may
constitute up to ~10% of our entire collected sample, suggests that they are
derived from material formed by planetary igneous fractionation. Their chemical
composition is unlike any known solar system material. We compare these
compositions to known differentiated bodies in the solar system and find them
similar to evolved planetary materials - with lunar KREEP the closest in terms
of its trace element enrichment pattern, but unusual in terms of their elevated
CI-normalized incompatible elements. The BeLaU-type spherules reflect a highly
differentiated, extremely evolved composition of an unknown source.
