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首页> 外文期刊>Marine Geology >Late-Quaternary morpho-sedimentology and submarine mass movements of the Betsiamites area, Lower St. Lawrence Estuary, Quebec, Canada
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Late-Quaternary morpho-sedimentology and submarine mass movements of the Betsiamites area, Lower St. Lawrence Estuary, Quebec, Canada

机译：加拿大魁北克省下圣劳伦斯河口Betsiamites地区的第四纪后期形态沉积和海底物质运动

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摘要

A complex submarine geomorphology was revealed from multibeam bathymetry and seismic reflection surveys conducted between 2001 and 2007 in the Lower St. Lawrence Estuary offshore Betsiamites River, Quebec, Canada. In this paper, we describe the submarine morpho-sedimentology of an area of approx 500 km~2 with focus on the consequences of four mass movement events. The general morpho-sedimentology of the area and submarine features resulting from mass movement processes, channel erosion and gas seepage are described. A spatio-temporal sequence for the occurrence of the mass movements and a chronology for the failures are established. We propose dates for four of the observed mass movement deposits. A buried paraglacial debris flow deposit is dated as older than 9280 cal BP, whereas a major landslide scar characterized by two topographic depressions on the shelf and a sediment lobe in the Laurentian Channel were dated around 7250 cal BP. Morphological observations and sediment core analyses allow us to identify a least two different recent (i.e., less than 500 yr old) debris flow accumulations associated with two recent earthquakes: (1) the AD 1663 (M - 7) and (2) AD 1860 (M -6) or AD 1870 (M -6.5) earthquakes. In addition to a complex geomorphology influenced by mass movements, we have identified several regions on the shelf and on the Laurentian Channel with evidence of pockmarks, which could potentially influence submarine slope stability in the Estuary.
机译：从2001年至2007年在加拿大魁北克省下圣劳伦斯河口贝齐米特斯河近海进行的多波束测深和地震反射调查揭示了复杂的海底地貌。在本文中，我们描述了大约500 km〜2区域的海底形态沉积学，重点是四个大规模运动事件的后果。描述了由于质量运动过程，河道侵蚀和瓦斯渗漏而引起的区域和潜艇特征的一般形态沉积学。建立了质量运动发生的时空顺序和失效的时间顺序。我们提出了四个观测到的物质运动沉积的日期。埋藏的冰川下泥石流沉积物的年代可以追溯到9280 cal BP，而主要的滑坡疤痕的年代大约为7250 cal BP，其特征是架子上有两个地形凹陷，而Laurentian海峡中有沉积物。形态学观察和沉积物核心分析使我们能够识别与至少两次最近的地震有关的至少两种不同的近期（即小于500年历史）泥石流堆积：（1）AD 1663（M-7）和（2）AD 1860 （M -6）或AD 1870（M -6.5）地震。除了受质量运动影响的复杂地貌外，我们还确定了在架子上和劳伦斯海峡上的几个区域，上面有痘痕，这可能会影响河口海底斜坡的稳定性。

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