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首页> 外文期刊>Quaternaire >Catastrophic events as chronological markers in the sedimentary sequence of les gravanches / gerzat (limagne d'auvergne, massif central, France) [La séquence sédimentaire des gravanches / gerzat enregistrement d'événements ?catastrophiques? à valeur chronologique en limagne d'auvergne (massif central, France)]
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Catastrophic events as chronological markers in the sedimentary sequence of les gravanches / gerzat (limagne d'auvergne, massif central, France) [La séquence sédimentaire des gravanches / gerzat enregistrement d'événements ?catastrophiques? à valeur chronologique en limagne d'auvergne (massif central, France)]

机译:灾难性事件作为les gravanches / gerzat沉积序列中的时间标记(法国中部地块limagne auvergne)[gravanches / gerzat的沉积序列记录了灾难性事件?按时间顺序在Limagne auvergne(法国中央断层)]

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摘要

A sedimentary type-sequence of the Grand Limagne marsh has been established after numerous operations of preventive archaeology in the eastern suburbs of Clermont-Ferrand. When complete, this sequence records volcano-sedimentary processes from the Late-Glacial up to the Subatlantic period. Abrupt, brief and catastrophic events mark out to this succession: seven tephras are markers of the Cha?ne des Puys volcanic activity; a possible cosmic event (the "Red Layer") is recorded; alluvial deposits testify of major floods and seismites attest of local instability. Besides archaeological data, the direct dating of tephras (CFla / CFlb: ca. 13,500 cal. yr BP; CF3: 12,064 ±316 cal. yr BP; CF4: 11,400 cal. yr BP; CF7: 8,468 ± 147 cal. yr BP) and of the "Red Layer" (7,741 ± 74 cal. yr BP) bring absolute markers for the Gravanches / Gerzat sequence and widely for other paludal sequences in Grande Limagne. Black, humic and polycyclic deposits, namely the famous ? black earth of Limagne ?, thus find a good stratigraphie position between the Boreal period (with CF7 tephra) and the fourth/fifth centuries (regional humid crisis).
机译:在克莱蒙费朗东郊进行了多次预防考古工作后,建立了大玛格纳尼沼泽的沉积类型序列。完成后,此序列记录了从晚冰期到次大西洋时期的火山沉积过程。突发,短暂和灾难性的事件标志着这一演替:七个特非拉斯是Cha?ne des Puys火山活动的标志。记录可能的宇宙事件(“红色层”);冲积物证明发生了大洪水和地震,证明了当地的不稳定。除考古数据外,特弗拉斯的直接年代测定(CFla / CFlb:约BP 13,500 cal.yr BP; CF3:BP约12,064±316 cal.yr; CF4:BP约11,400 cal.yr; CF7:BP约8,468±147 cal.yr)的“红色层”(BP年龄为7,741±74 cal)为Gravanches / Gerzat序列和Grande Limagne中的其他沼泽序列带来了绝对的标记。黑色,腐殖质和多环型矿床,即著名的?因此,在Boreal时期(CF7特非拉)和第四,第五个世纪(区域潮湿危机)之间找到了良好的地层位置。

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