M. Bosq, P. Bertran, Cédric Beauval, S. Kreutzer, M. Duval, M. Bartz, N. Mercier, Luca Sitzia, P. Stéphan
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The investigated sections comprise estuarine, lacustrine and peaty deposits (Negade Formation, Argiles du Gurp Formation), aeolian sands (Sables du Gurp Formation) and colluvial units (Gres de l'Amelie Formation). The Argiles du Gurp Formation, in which many remains of Palaeoloxodon antiquus were found, support the hypothesis of a progressive replacement of a tide-inluenced marsh by a peaty fresh-water pond during the Holsteinian Interglacial (MIS 11). IR-RF dating of green estuarine clays at L’Amelie, in the northernmost part of the investigated area, strongly suggests that they do not belong to the Argile du Gurp Formation, but were deposited during the MIS 9 sea level highstand. The estuarine deposits are overlain by sandsheets (Sables du Gurp Formation) dated to MIS 10 and MIS 8 at Pointe de la Negade in the southern part of the study area, and to MIS 8 at L’Amelie. Syngenetic frost cracks testify to a periglacial depositional environment. Regional studies show that the Sables du Gurp Formation is a local equivalent of the Sables des Landes Formation, and corresponds to the oldest aeolian phase recorded in south-west France so far. Colluvial material (Gres de l'Amelie Formation) dated to the Weichselian pleni-glacial (MIS 2) ill small palaeo-valleys incised in the Sables du Gurp Formation. Holocene coastal dunes cover the whole sequence.","PeriodicalId":49645,"journal":{"name":"Quaternaire","volume":" ","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2019-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"14","resultStr":"{\"title\":\"Stratigraphy and chronology of Pleistocene coastal deposits in northern Aquitaine, France: a reinvestigation\",\"authors\":\"M. Bosq, P. Bertran, Cédric Beauval, S. Kreutzer, M. Duval, M. Bartz, N. Mercier, Luca Sitzia, P. 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引用次数: 14
摘要
法国西南部梅多克地区海岸暴露的更新世沉积物代表了宝贵的古环境档案,在过去几十年中一直是大量工作的主题。为了进一步了解这些矿床的古环境历史和沉积动力学,对一系列新剖面进行了详细的岩石地层学研究。此外,通过石英和长石颗粒的发光(OSL,IR-RF)和电子自旋共振(ESR)测年相结合,获得了新的时间数据(Kreutzer等人,2018)。调查路段包括河口、湖泊和泥炭沉积物(Negade组、Argiles du Gurp组)、风积沙(Sables du Gurp层)和崩坡积单元(Gres de l’Amelie组)。在Argiles du Gurp组中发现了许多古洛齿龙antiquus的遗迹,支持了在荷尔斯坦阶间冰川(MIS 11)期间,由泥炭淡水池逐渐取代潮汐影响的沼泽的假设。调查区域最北部L'Amelie的绿色河口粘土的IR-RF年代测定强烈表明,它们不属于Argile du Gurp组,而是在MIS 9海平面高位沉积的。河口沉积物被研究区南部Pointe de la Negade的MIS 10和MIS 8以及L’Amelie的MIS 8的沙片(Sables du Gurp Formation)覆盖。同生霜裂缝证明了冰缘沉积环境。区域研究表明,Sables du Gurp组在当地相当于Sables des Landes组,对应于迄今为止法国西南部记录的最古老的风成期。在Sables du Gurp组中切割的小古河谷中,可追溯到Weichselian pleni冰川(MIS 2)的寒流物质(Gres de l’Amelie组)。全新世海岸沙丘覆盖了整个序列。
Stratigraphy and chronology of Pleistocene coastal deposits in northern Aquitaine, France: a reinvestigation
Pleistocene deposits exposed along the coast of the Medoc area, south-west France, represent valuable palaeoenvironmental archives that have been the subject of extensive work in the past few decades. To further understand the palaeoenvironmental history and sedimentary dynamics of these deposits, a detailed lithostratigraphic study was performed on a series of new sections. Additionally, new chronological data were obtained from the combination of luminescence (OSL, IR-RF) and electron spin resonance (ESR) dating of quartz and feldspar grains (Kreutzer et al., 2018). The investigated sections comprise estuarine, lacustrine and peaty deposits (Negade Formation, Argiles du Gurp Formation), aeolian sands (Sables du Gurp Formation) and colluvial units (Gres de l'Amelie Formation). The Argiles du Gurp Formation, in which many remains of Palaeoloxodon antiquus were found, support the hypothesis of a progressive replacement of a tide-inluenced marsh by a peaty fresh-water pond during the Holsteinian Interglacial (MIS 11). IR-RF dating of green estuarine clays at L’Amelie, in the northernmost part of the investigated area, strongly suggests that they do not belong to the Argile du Gurp Formation, but were deposited during the MIS 9 sea level highstand. The estuarine deposits are overlain by sandsheets (Sables du Gurp Formation) dated to MIS 10 and MIS 8 at Pointe de la Negade in the southern part of the study area, and to MIS 8 at L’Amelie. Syngenetic frost cracks testify to a periglacial depositional environment. Regional studies show that the Sables du Gurp Formation is a local equivalent of the Sables des Landes Formation, and corresponds to the oldest aeolian phase recorded in south-west France so far. Colluvial material (Gres de l'Amelie Formation) dated to the Weichselian pleni-glacial (MIS 2) ill small palaeo-valleys incised in the Sables du Gurp Formation. Holocene coastal dunes cover the whole sequence.
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.