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\begin{document}

\title{Coeval Minimum South American and Maximum Antarctic Last Glacial Maximum
Dust Deposition: Causal Link?}



\author[1]{Renata Coppo}%
\author[2]{Nicolas Cosentino}%
\author[3]{Gabriela Torre}%
\author[4]{Ian del Rio}%
\author[4]{Andre Oliveira Sawakuchi}%
\author[5]{Edinei Koester}%
\author[6]{Ana Laura Berman}%
\author[3]{Diego Gaiero}%
\affil[1]{Centro de investigaciones en Ciencias de la Tierra}%
\affil[2]{Pontificia Universidad Católica de Chile}%
\affil[3]{Centro de Investigaciones en Ciencias de la Tierra}%
\affil[4]{University of São Paulo}%
\affil[5]{Universidade Federal do Rio Grande}%
\affil[6]{Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales.}%


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  \date{May 26, 2024}


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\begin{abstract}
We present a regional study of the Pampean loess in South America based
on a detailed analysis of three sections across the core of the Pampas.
High-resolution luminescence dating resulted in a new chronology that
covers a period from Marine Isotope Stage 3 to the early Holocene.
Reliable estimations of mass accumulation rates (MARs) for loess were
used to infer the temporal dust flux variation during the last
glacial/interglacial transition in southern South America (SSA). Minimum
MARs in each section were identified for the Last Glacial Maximum (LGM),
contrasting with high dust fluxes observed in more distal Southern
Atlantic Ocean (SAO) and East Antarctica. We hypothesize that the power
of the Pampean loess as a sink of dust was reduced during the LGM,
allowing long-range transport of SSA dust to SAO and East Antarctica.
This hypothesis is consistent with proxy data and models suggesting
drier conditions in the Pampas during the LGM, which would have shut
down loess accumulation. It is also consistent with isotopic evidence
that points to northern Patagonia and southern central-western Argentina
as main contributors of dust to East Antarctica during glacials, given
that the prevailing regional wind system implies that dust emitted from
these regions would have necessarily passed through the Pampas in its
way to the SAO and East Antarctica. Forthcoming Nd, Sr, and Pb isotope
results for the Pampean loess will allow further testing of this
hypothesis.%
\end{abstract}%



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\verb`essoar.10508915.1.docx`  available at \url{https://authorea.com/users/535731/articles/598844-coeval-minimum-south-american-and-maximum-antarctic-last-glacial-maximum-dust-deposition-causal-link}

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