Discovery of a large 2.4 Ma Plinian eruption of Basse-Terre, Guadeloupe, from the marine sediment record

Discovery of a large 2.4 Ma Plinian eruption of Basse-Terre, Guadeloupe, from the marine sediment record
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根据海洋沉积物记录发现瓜德罗普岛巴斯特尔发生 2.4 Ma 普林尼式大喷发

DOI:
10.1130/g37193.1
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发表时间:
2016
期刊:
影响因子:
5.8
通讯作者:
Palmer M
Palmer M
中科院分区:
地球科学1区
文献类型:
--
作者:
Palmer M

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大型火山爆发是主要的地质灾害,因此确定其在地质记录中的频率对于进行预测和灾害评估至关重要。在加勒比海蒙特塞拉特和瓜德罗普之间的综合大洋钻探计划(IODP)地点U1396的海洋沉积物中发现了厚(18厘米)的火山灰层之后,我们在这里记录了如何使用高精度的铅同位素、微量元素和火山灰颗粒形态分析,以及火山模型,以确定一个大的(火山爆炸性指数106)普林尼火山喷发从巴斯特尔,瓜德罗普,在约。2.36 MA.这一先前未被承认的喷发被认为是该地区自那时以来最大的火山事件。我们假设,这一大喷发与个别火山中心的演化的最后阶段,这对在这种情况下的地质灾害预测的影响。
Large volcanic eruptions are major geohazards, so identifying their frequency in the geologic record is critical for making predictions and hazard assessments. Following the discovery of a thick (18 cm) tephra layer in marine sediments from Integrated Ocean Drilling Program (IODP) Site U1396 between Montserrat and Guadeloupe in the Caribbean Sea, we document here how high-precision Pb isotopes, trace elements, and grain morphological analyses of the tephra can be used, together with volcanological models, to identify a large (Volcanic Explosivity Index∼ 6) Plinian eruption from Basse-Terre, Guadeloupe, at ca. 2.36 Ma. This previously unrecognized eruption is believed to be the largest documented volcanic event in this region since this time. We hypothesize that this large eruption was associated with the final stage in the evolution of an individual volcanic center, which has implications for prediction of geohazards in this setting.
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