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首页> 外文期刊>Natural hazards and earth system sciences >Multidisciplinary characterisation of sedimentary processes in a recent maar lake (Lake Pavin, French Massif Central) and implication for natural hazards
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Multidisciplinary characterisation of sedimentary processes in a recent maar lake (Lake Pavin, French Massif Central) and implication for natural hazards

机译：最近的玛尔湖（法国帕斯湖中部的帕文湖）沉积过程的多学科表征及其对自然灾害的影响

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Sedimentation processes occurring in the most recent maar lake of the French Massif Central (Lake Pavin) are documented for the first time based on high resolution seismic reflection and multibeam bathymetric surveys and by piston coring and radiocarbon dating on a sediment depocentre developed on a narrow sub aquatic plateau. This new data set confirms the mid Holocene age of maar lake Pavin formation at 6970±60 yrs cal BP and highlights a wide range of gravity reworking phenomena affecting the basin. In particular, a slump deposit dated between AD 580-640 remoulded both mid-Holocene lacustrine sediments, terrestrial plant debris and some volcanic material from the northern crater inner walls. Between AD 1200 and AD 1300, a large slide scar mapped at 50 m depth also affected the southern edge of the sub aquatic plateau, suggesting that these gas-rich biogenic sediments (laminated diatomite) are poorly stable. Although several triggering mechanisms can be proposed for these prehistoric sub-aquatic mass wasting deposits in Lake Pavin, we argue that such large remobilisation of gas-rich sediments may affect the gas stability in deep waters of meromictic maar lakes. This study highlights the need to further document mass wasting processes in maar lakes and their impacts on the generation of waves, favouring the development of dangerous (and potentially deadly) limnic eruptions.
机译：基于高分辨率地震反射和多波束测深测量，以及在狭窄亚带上形成的沉积物沉积中心上的活塞取心和放射性碳测年，首次记录了法国断层块中央（帕文湖）最近的马尔湖发生的沉积过程。水上高原。这个新的数据集证实了Maar湖Pavin形成的全新世中期年龄为BP 6970±60年，并强调了影响盆地的广泛的重力改造现象。特别是，日期在公元580-640年之间的坍落沉积物重塑了全新世中期湖相沉积物，陆生植物残骸和北部火山口内壁的一些火山物质。在公元1200年至公元1300年之间，一个深度为50 m的大型滑动疤痕也影响了水生高原的南部边缘，这表明这些富含气体的生物成因沉积物（叠层硅藻土）不稳定。尽管可以为帕文湖中的这些史前亚水体大量浪费沉积物提出几种触发机制，但我们认为，如此大量的富气沉积物迁移可能会影响马默克特马尔湖深水区的气体稳定性。这项研究强调了有必要进一步记录马阿尔湖中的大规模消瘦过程及其对海浪产生的影响，从而有利于危险（可能致命）的褐煤喷发。

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