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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Radiometric Dating Of Three Large Volume Flank Collapses In The Lesser Antilles Arc
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Radiometric Dating Of Three Large Volume Flank Collapses In The Lesser Antilles Arc

机译：较小的安的列斯群岛弧中三个大体积侧面崩塌的辐射定年

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It is now recognised that flank collapses are a recurrent process in the evolution of the Lesser Antilles Arc volcanoes. Large magnitude debris-avalanche deposits have been identified off the coast of Dominica, Martinique and St. Lucia, with associated volumes up to 20 km~3 [Deplus, C, Le Friant, A., Boudon, G., Komorowski, J.-C, Villemant, B., Harford, C, Segoufin, J., Cheminee, J.-L, 2001. Submarine evidence for large-scale debris avalanches in the Lesser Antilles Arc. Earth Planet. Sci. Lett., 192: 145-157.). We present new radiometric dating of three major events using the K-Ar Cassignol-Gillot technique. In the Qualibou depression of St Lucia, a collapse has been constrained by dome emplacement prior to 95 ±2 ka. In Dominica, where repetitive flank collapse events have occurred [Le Friant, A., Boudon, G., Komorowski, J.-C, Deplus, C, 2002. Lile de la Dominique, a l'origine des avalanches de debris les plus volumineuses de l'arc des Petites Antilles. C.R. Geoscience, 334: 235-243], the Plat Pays event probably occurred after 96±2 ka. Inside the depression caused by this event, Scotts Head, which is interpreted as a proximal megabloc from the subsequent Soufriere avalanche event has been dated at 14±1 ka, providing an older bound for this event. On Martinique three different domes within the Carbets structure dated at 337 ±5 ka constrain the age of this high magnitude event. Finally, these results obtained from three of the most voluminous flank collapses provide constraints to estimate the recurrence of these events, which represent one of the major hazards associated with volcanoes of the Lesser Antilles Arc.
机译：现在已经认识到，侧翼坍塌是小安的列斯群岛弧火山演化中的一个经常性过程。多米尼加，马提尼克和圣卢西亚沿岸已发现大量的碎片雪崩沉积物，伴生量可达20 km〜3 [Deplus，C，Le Friant，A.，Boudon，G.，Komorowski，J. -C，Villemant，B.，Harford，C，Segoufin，J.，Cheminee，J.-L，2001。海底证据显示小安的列斯群岛有大规模的碎片雪崩。地球行星。科学Lett。，192：145-157。）。我们使用K-Ar Cassignol-Gillot技术介绍了三个主要事件的新辐射定年。在圣卢西亚的Qualibou洼地，塌陷在95±2 ka之前受到穹顶的限制。在多米尼加，发生了反复的侧面倒塌事件[Le Friant，A.，Boudon，G.，Komorowski，J.-C，Deplus，C，2002。Lile de la Dominique，雪崩的原始起源小小安的列斯大区体积。 C.R. Geoscience，334：235-243]，Plat Pays事件可能发生在96±2 ka之后。在由该事件引起的洼地内，斯科茨角被解释为随后发生的苏弗雷雪崩事件的近端巨块，其日期为14±1 ka，为该事件提供了较早的界限。在马提尼克岛，Carbets结构内三个不同的穹顶（日期为337±5 ka）限制了这一高强度事件的年龄。最后，从三个最大的侧面崩塌中获得的这些结果为估计这些事件的复发提供了限制，这代表了与小安的列斯群岛火山相关的主要危险之一。

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