Wind-blown dust deposits are considered one of the most important terrestrial archives for past climate change studies. In the Southern Hemisphere, the Pampean loess is the most extensive paleo-dust record, whose origin is still a matter of debate. In this paper, grain-size was carried out at three high-resolution loess profiles deposited during the late Pleistocene-early Holocene and for present-day dust collected on the Pampean plain. Based on comparing loess records with in situ present-day dust, this work aims to provide constraints on the climatic conditions that allowed deposition of the Argentinean loess mantle. Unmixing methods allow differentiating three grain-size subpopulations/end members in the Pampean loess which are comparable to end members found in present-day dust. The provenance and transport conditions observed for present-day dust were used to infer that the fine silt components of Pampean loess were transported by high-level air stream associated with the deflation of the Puna-Altiplano Plateau. On the other side, the coarse-silt sediments were carried by dust storms associated with high transport energy events taking place in proximal dust sources. In the central Pampas, the increased abundance of coarse-silt sediments during the Antarctic Cold Reversal (ACR) may indicate the existence of an increased frequency of dust storm episodes. During the beginning of the Holocene, the rise in fine-silt loess could be linked to the activation of distant sources associated with lake desiccation in the Puna-Altiplano Plateau.

风吹尘埃沉积物被认为是过去气候变化研究中最重要的地面档案之一。在南半球，潘邦黄土是最广泛的古尘记录，其起源尚有争议。在本文中，在更新世晚期至全新世早期沉积的三个高分辨率黄土剖面以及目前在潘庞斯平原上收集的灰尘中，对三个高分辨率黄土剖面进行了粒度测量。在将黄土记录与现今尘土进行比较的基础上，这项工作旨在对允许阿根廷黄土幔沉积的气候条件提供限制。分解方法可以区分潘邦黄土中的三种粒度亚群/末端成员，这与当今尘埃中的末端成员具有可比性。利用当今尘埃的出处和运输条件可以推断出潘帕斯黄土的细粉沙成分是由与普纳高原高原放气相关的高水平气流所运输的。另一方面，沙尘暴携带的是粗粉沙沉积物，而沙尘暴与近端尘埃源中发生的高运输能事件有关。在潘帕斯中部，南极逆转期间粗泥沙沉积物的增加可能表明沙尘暴发作频率增加。在全新世初期，细粉土黄土的增加可能与Puna-Altiplano高原上与湖泊干燥有关的遥远源的活化有关。