Coeval minimum south American and maximum Antarctic last glacial maximum dust deposition: A causal link?

COPPO, RENATA; DEL RIO, IAN; KOESTER, EDINEI; TORRE, GABRIELA; BERMAN, ANA LAURA; GAIERO, DIEGO M.; COSENTINO, NICOLÁS J.; SAWAKUCHI, ANDRÉ O.; DELMONTE, BARBARA

QUATERNARY SCIENCE REVIEWS

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2022 vol. 295

0277-3791

Records of wind-blown mineral dust provide an excellent proxy of past atmospheric circulation, a key parameter to understanding Earth´s climate changes. Dust deposition at distal sites depends on atmo- spheric conditions both in sink areas, along transport pathways, and close to dust sources. To disentangle the contributions of changes in these conditions to distal dust deposition, it is necessary to retrieve complementary information from geological dust archives at different distances from sources. In the Southern Hemisphere, paleo-dust recorded at proximal loess remains under-studied compared to dust recorded at medium- and long-range archives. Here, we expand previous sampling of southern South America´s Pampean loess. New age models based on luminescence dating of potassium feldspar imply minimum dust mass accumulation rates during the early part of the Last Glacial Maximum (LGM) across all three sampled sites, in opposition to coeval maximum dust deposition in the East Antarctic Plateau (EAP). In turn, provenance analysis based on neodymium and strontium isotopes suggests that