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首页> 外文期刊>Geoarchaeology >Stratigraphy and palaeopedology of the palaeolithic cave site of Combe-Saunière, southwest France
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Stratigraphy and palaeopedology of the palaeolithic cave site of Combe-Saunière, southwest France

机译：法国西南部Combe-Saunière旧石器时代洞穴遗址的地层学和古生物学

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The sequence of Combe-Saunière (southwest France) has been studied with a large suite of methods, including micromorphology, geochemistry, magnetic susceptibility, and organic matter (OM) analysis in order to document the post-depositional processes that occurred during the last climatic cycle at the cave entrance. This study shows that intense weathering together with the accumulation of OM and phosphates by cave animals and others vectors (including humans) occurred during the phases of low clastic sedimentation. During the latter part of Marine Isotope Stage (MIS) 3, the Aurignacian and Gravettian humus-bearing levels, which may be classified as cryoturbated leptosols, show incomplete decalcification and are dominated by poorly evolved forms of phosphates (bone fragments, coprolites). Phosphatized cambic B-horizons formed at the beginning of MIS 3 and the Early Glacial and may reflect longer periods of pedological modification. The molecules identified by the analysis of the OM extracted from the Chatelperronian level derive mostly from the degradation of vegetal matter, most notably from conifers and mosses, in addition to bacteria and fungi. The Last Interglacial s.l. (MIS 5) is typified by the development of a phosphatized illuviated B-horizon. Intense weathering together with phosphate leaching and precipitation took place in this soil, forming thick apatite-CaOH crusts. Although the poor chronological resolution prevents us from drawing clear conclusions as to the respective roles of the factors involved, phosphate accumulation and weathering seem to be controlled primarily by the duration of the soil-forming periods. This study strongly suggests that a climatic signal has been recorded in the deposits.
机译：Combe-Saunière（法国西南）的层序已通过大量方法进行了研究，包括微观形态学，地球化学，磁化率和有机质（OM）分析，以记录上次气候变化期间发生的沉积后过程。在山洞入口处骑自行车。这项研究表明，在低碎屑沉积阶段，强烈的风化以及洞穴动物和其他媒介物（包括人）对OM和磷酸盐的积累产生了影响。在海洋同位素阶段（MIS）3的后期，可能被归类为冷冻扰动的瘦小溶胶的奥里尼亚克人和格拉维特人的腐殖质水平显示出不完全的脱钙作用，并且以磷酸盐（骨骼碎片，共腐殖质）的不良演化形式占主导地位。在MIS 3的开始和冰川早期形成了磷酸化的后生B地平线，可能反映了更长时期的土壤学改造。通过分析从Chatelperronian水平提取的OM鉴定出的分子，除细菌和真菌外，主要源自植物物质的降解，最主要来自针叶树和苔藓。最后的冰河间（MIS 5）的典型代表是磷酸化的营养化B地平线。在该土壤中发生强烈的风化以及磷酸盐的浸出和沉淀，形成厚的磷灰石-CaOH结壳。尽管不良的时间分辨力使我们无法就所涉及因素的各自作用得出清晰的结论，但磷酸盐的积累和风化似乎主要受成土期的控制。这项研究强烈表明，在沉积物中已记录到气候信号。

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