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\begin{document}

\title{D" reflection polarities inform lowermost mantle mineralogy}



\author[1,1]{Christine Thomas}%
\author[2,2]{Laura Cobden}%
\author[1,1]{Art R. T. Jonkers}%
\affil[1]{University of Muenster}%
\affil[2]{Utrecht University}%


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  \date{June 14, 2024}


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\begin{abstract}
Polarities of seismic reflections at the discontinuity atop the D''
region (PdP and SdS) indicate the sign of the velocity contrast across
the D'' reflector. Recent studies found PdP polarities matching and
opposite those of P and PcP. While anisotropy could explain this
behavior, we find that the ratio of the change in S-wave velocity over
change in P-wave velocity (R-value) can influence polarity behavior of
D'' reflected P-waves. For R-values exceeding 3 the P-wave reverses
polarity in the absence of anisotropy while S-wave polarity is not
influenced by the R-value. Using sets of 1 million models for normal
mantle and MORB with varying minerals and processes across the boundary,
we carry out a statistical analysis (Linear Discriminant Analysis)
finding that there is a marked difference in mantle mineralogy to
explain R values larger and smaller than 3, respectively. Based on our
results we can attribute different mineralogy to a number of cases. In
particular, we find that when velocities increase across D'' and
polarities of PdP and SdS are opposite the post-perovskite phase
transition is still the best explanation while MORB is the best
explanation when PdP and SdS are the same. When the velocities are
decreasing, the post-perovskite phase transition within MORB is the best
explanation if PdP and SdS polarities are the same but if PdP and SdS
are opposite in regions of velocity decreases, our results indicate that
primordial material or mantle enriched in bridgmanite can explain the
polarity behavior, further constraining mineralogy within the LLSVPs.%
\end{abstract}%



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