Thin loess deposits are widespread soil parent materials and important archives for paleoenvironmental reconstruction. The origin of loess in SW Poland is attributed to the Great Odra Valley (GOV), following the general concept that large rivers play a major role in regional silt supply. Yet, the precise provenance (glacier sources and/or local rocks) of silts, possibly deflated from dry GOV braided riverbeds, is not clear. Our study of thin and thick loess mantles in SW Poland for the first time indicates the provenance of thin loess based on mineralogical (MLA-SEM) and isotopic analyses (¹⁴³Nd/¹⁴⁴Nd, ⁸⁷Sr/⁸⁶Sr). Luminescence ages of five localities point to thin loess mantle formation during and shortly (23.0 to 17.7 ka yr) after the Last Glacial Maximum (LGM). Our isotopic data indicate that thin loess deposits in SW Poland are the mixtures of two main components – local Sudetic and Scandinavian, the latter delivered by the Fennoscandian ice sheet (FIS). Also, detailed analyses of heavy minerals show that a single mineral (e.g., hornblende) may come from both Sudetic and Scandinavian sources. This research highlights the role of the (Pleistocene) GOV in collecting and homogenizing materials, while supplying the region with fine particles to be deflated by paleowinds from open surfaces. Anomalies in mineralogy and isotopic composition are connected with influence of Sudetic mountain rivers and locally blowing silt material by katabatic winds. Regional grain size differentiation of thin loess mantles explains transport distance and altitude.

稀薄的黄土沉积物是广泛的土壤母体材料，是古环境重建的重要档案。波兰西南部黄土的起源归因于大奥得河谷（GOV），这是大河流在区域淤泥供应中起主要作用的一般概念。但是，尚不清楚泥沙的确切来源（冰川源和/或当地岩石），可能是从干燥的GOV辫状河床中排出的。我们首次在波兰西南部对稀薄的黄土地幔进行研究，结果表明基于矿物学（MLA-SEM）和同位素分析的稀薄黄土源（¹⁴³ Nd / ¹⁴⁴ Nd，⁸⁷ Sr / ⁸⁶Sr）。五个地方的发光年龄表明在最后一次冰期最大值（LGM）期间和之后（23.0至17.7 ka年），黄土幔形成稀薄。我们的同位素数据表明，波兰西南部的稀薄黄土矿床是两种主要成分的混合物-当地的Sudetic和斯堪的纳维亚半岛，后者由芬诺斯堪的亚冰盖（FIS）输送。此外，对重矿物的详细分析表明，单一矿物（例如角闪石）可能来自Sudetic和斯堪的纳维亚的来源。这项研究突出了（更新世）GOV在收集和均质材料中的作用，同时为该区域提供了细小的颗粒，这些颗粒将被来自开放表面的古风缩小。矿物学和同位素组成的异常与苏迪克山区河流的影响以及由方型风吹起的淤泥物质有关。