Holocene palaeoenvironmental evolution of the Médoc peninsula (SW France): insights from the sedimentological study of the “Lède du Gurp” archaeological site

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
S. Faye, F. Eynaud, M. Bosq, C. Lambert, Florence Verdin, P. Véquaud, Ophélie Lodyga, Hervé Dériennic, P. Lebleu, S. Bujan, I. Billy, Bernard Martin, J. Roussot-Larroque
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引用次数: 7

Abstract

High coastal erosion rates along the beaches of the Medoc peninsula urge for the study of the Pleistocene and Holocene deposits buried under the modern dune. Those deposits are known to be exceptionally rich in archaeological remains (from the Mesolithic at least). The aggressive predation of these fossil deposits by the sea explains the urgency of exploring their content and their sedimentological history. Within these formations, the “Lede du Gurp” archaeological site located on the shore, on the administrative boundary of Soulac-sur-Mer and Grayan-et-l’Hopital, is of tremendous value for palaeogeographical and palaeoenvironmental reconstructions of the Medoc peninsula. This site has preserved remains of dense anthropic activity but also evidence of the history of the estuary’s migration before our contemporary era (i.e. recent centuries). Here we present results of new sedimentological investigations conducted as part of the LITAQ project on and around the site. Continuous and undisturbed sections several metres thick (up to 3.5 m) have been obtained by sampling (sediment slides) and coring operations in the field and studied for their lithostratigraphy (using classic and X-ray imaging coupled with spectrocolorimetry, X-ray fluorescence and grain-size analyses together with radiocarbon dating) along with simultaneous archaeological investigations. Our study refines the palaeoenvironmental evolution of the site over at least the Neolithic period and supports previous interpretations of the origin of these atypical lithofacies, i.e. the deposition of a thick Holocene sequence of clays and peats in a depression associated with karstification processes. Our new datings and observations suggest the possible occurrence of a thermokarst system during the coldest phases of the last deglaciation.
法国西南部姆萨姆多克半岛全新世古环境演化:来自“l de du Gurp”考古遗址沉积学研究的见解
沿梅多克半岛海滩的高海岸侵蚀率促使人们研究埋藏在现代沙丘下的更新世和全新世沉积物。众所周知,这些沉积物中有非常丰富的考古遗迹(至少是中石器时代的)。这些化石沉积物在海边的侵略性掠夺解释了探索它们的内容和沉积学历史的紧迫性。在这些地层中,“Lede du Gurp”考古遗址位于海岸上,位于Soulac-sur-Mer和Grayan-et-l 'Hopital的行政边界上,对梅多克半岛的古地理和古环境重建具有巨大价值。这个遗址保存了密集人类活动的遗迹,也是我们当代(即近几个世纪)之前河口迁移历史的证据。在这里,我们介绍了作为LITAQ项目的一部分在该地点及其周围进行的新的沉积学调查的结果。通过取样(沉积物滑动)和野外取心作业获得了几米厚(高达3.5米)的连续和未受干扰的剖面,并对其岩石地层学进行了研究(使用经典和x射线成像,结合分光比色法,x射线荧光和粒度分析以及放射性碳测年),同时进行了考古调查。我们的研究细化了该遗址至少在新石器时代的古环境演化,并支持了之前对这些非典型岩相起源的解释,即与岩溶作用过程相关的洼地中厚的全新世粘土和泥炭层序的沉积。我们的新年代测定和观测表明,在最后一次消冰最冷的阶段可能存在热岩溶系统。
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来源期刊
Quaternaire
Quaternaire 地学-地球科学综合
CiteScore
1.70
自引率
0.00%
发文量
18
审稿时长
>12 weeks
期刊介绍: La revue Quaternaire créée dès 1964 par l"AFEQ sous le nom de Bulletin de l"AFEQ est devenue Quaternaire en 1990. Ce journal scientifique paraît au rythme de quatre numéros par an. La revue publie des numéros d"auteurs (par ordre d"arrivée des manuscrits après acceptation) ou des numéros thématiques sur proposition ou invitation par le comité de rédaction. Les articles (en langue française, anglaise ou allemande) traitant de tous les aspects du Quaternaire sont acceptés. La revue est publiée avec le concours du Centre National de la Recherche Scientifique.
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