The Pampean loess is the most extensive continental paleo-record of aeolian material in the Southern Hemisphere, recording the deposition of dust transported by two major zonal wind systems: the southern westerly winds and the subtropical jets. In order to increase the understanding on paleo-atmospheric circulation over the Southern Hemisphere, we evaluate dust provenance through REE, Nd, Sr and Pb isotopes in three sections deposited during late Pleistocene-early Holocene across 700 km in the loess belt of the Pampean region in central Argentina. The isotopic comparison of loess from the three sections with southern South American (SSA) potential dust sources show that (1) sources from the southern Altiplano to latitudes of northern Patagonia supplied dust to the Pampas, (2) the slight SrNd isotopic difference between fine and coarse loess may be attributable to grain size effects rather than to differences in provenance, and (3) higher mass accumulation rates in the Pampas are associated with an increased presence of dust originated in the southern Altiplano and southern Puna during the spans of 43–41 ka BP, 20–18 ka BP, 14.6–12.6 ka BP and 11.4–8.9 ka BP. We associate these rises in continental dust fluxes with climatic transitions from wetter to drier periods in the Puna-Altiplano Plateau related to synchronous climatic shifts to humid conditions at the Pampean Plain, probably triggered by El Niño-like conditions. The isotopic comparison with modern SSA dust indicates similar provenance compared to paleo-dust records, suggesting almost constant dust sources from MIS 3 to modern times and/or modest changes in the geochemical signature under the activation/deactivation of the different dust sources. Moreover, contrasting the isotopic signature of the loess sections with more distal palaeoarchives (i.e., South Atlantic Ocean marine sediment cores and Antarctic ice cores), the new data suggest that contrary to previous ideas, the Pampean Loess was not an important source of dust to these regions. Also, a common dust provenance during cold periods (e.g., Last Glacial Maximum and Antarctic Cold Reversal) supports the idea that changes in atmospheric transport efficiency can better explain dust flux variations observed over glacial/interglacial periods in distant palaeoarchives than changes in provenance.

Pampean loess 是南半球最广泛的大陆古风成物质记录，记录了由两个主要纬向风系统输送的尘埃沉积：南西风和副热带急流。为了增加对南半球古大气环流的认识，我们通过 REE、Nd、 Sr和 Pb 同位素在晚更新世 - 早全新世沉积在阿根廷中部 Pampean 地区黄土带 700 公里的三个部分。三个断面黄土与南美南部（SSA）潜在尘源的同位素比较表明：（1）从高原南部到巴塔哥尼亚北部纬度的源向潘帕斯草原提供了尘埃，（2）轻微的锶细黄土和粗黄土之间的 Nd 同位素差异可能归因于粒度效应而不是来源差异，并且 (3) 潘帕斯草原较高的质量积累率与起源于高原南部和普纳南部的尘埃的存在增加有关。 43–41 ka BP、20–18 ka BP、14.6–12.6 ka BP 和 11.4–8.9 ka BP 的跨度。我们将大陆沙尘通量的这些上升与普纳-高原高原从潮湿期到干燥期的气候转变联系起来，这与潘佩恩平原的同步气候转变为潮湿条件有关，这可能是由类似厄尔尼诺现象的条件引发的。与现代 SSA 尘埃的同位素比较表明，与古尘埃记录相比，其来源相似，表明从 MIS 3 到现代几乎恒定的尘埃源和/或在不同尘埃源的激活/停用下地球化学特征的适度变化。此外，将黄土剖面的同位素特征与更远的古档案（即南大西洋海洋沉积物芯和南极冰芯）进行对比，新数据表明，与以前的想法相反，潘佩斯黄土并不是重要的尘埃来源。这些地区。此外，寒冷时期常见的粉尘来源（例如，Pampean 黄土并不是这些地区的重要尘埃来源。此外，寒冷时期常见的粉尘来源（例如，Pampean 黄土并不是这些地区的重要尘埃来源。此外，寒冷时期常见的粉尘来源（例如，最后一次冰期最大值和南极冷逆转）支持这样一种观点，即大气传输效率的变化可以更好地解释在遥远的古档案中观察到的冰期/间冰期的尘埃通量变化，而不是来源的变化。