Linking the Mediterranean MIS 5 tephra markers to Campi Flegrei (southern Italy) 109-92 ka explosive activity and refining the chronology of MIS 5c-d millennial-scale climate variability
Linking the Mediterranean MIS 5 tephra markers to Campi Flegrei (southern Italy) 109-92 ka explosive activity and refining the chronology of MIS 5c-d millennial-scale climate variability
复制标题
将地中海 MIS 5 火山灰标记与 Campi Flegrei（意大利南部）109-92 ka 爆炸活动联系起来，并完善 MIS 5c-d 千禧年尺度气候变化的年表
DOI：
10.1016/j.gloplacha.2022.103785
复制
发表时间：
2022
影响因子：
3.9
通讯作者：
Monaco L
中科院分区：
文献类型：
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作者：
Monaco L
长期以来，意大利南部那不勒斯火山区约 40 ka 坎帕尼亚火辉岩 (CI) 喷发之前的爆炸活动一直是根据广泛的火山灰层的出现推测的，具有坎帕尼亚地球化学特征，如地中海海洋同位素阶段 (MIS) 5 沉积记录中保存的 C-22、X-5 和 X-6。然而，之前对在那不勒斯火山附近发生的前CI火山碎屑单元的研究，包括Campi Flegrei、Somma-Vesuvius、Ischia和Procida群岛，并没有对这些火山灰标记的近源等效物进行结论性的鉴定。在这里，我们对坎帕尼亚平原的四个火山碎屑单元进行了全面的表征，包括主量和微量元素玻璃成分、单键 Nd 同位素和 40Ar/39Ar 测年。我们的数据可以识别 MIS 5 火山灰标记的内侧等效物，包括广泛分布的 C-22、X-5 和 X-6 火山灰，并将它们分配给之前未记录的 109 至 92 ka 之间的 Campi Flegrei 活动。除了大幅延长 Campi Flegrei 爆炸活动的时间深度，从而为重新评估其历史提供基础外，我们的研究结果还提供了新的精确放射性同位素测年法，以更好地限制地中海地区甚至可能更大范围内 MIS 5c-d 的千禧年尺度气候振荡的年表。
Explosive activity preceding the ~40 ka Campanian Ignimbrite (CI) eruption in the Neapolitan volcanic area, Southern Italy, has long been speculated based on the occurrences of widespread tephra layers, with a Campanian geochemical signature, such as the C-22, X-5, and X-6, preserved in Mediterranean Marine Isotope Stage (MIS) 5 sedimentary records. However, previous studies of pre-CI pyroclastic units occurring in close proximity of the Neapolitan volcanoes, including Campi Flegrei, Somma-Vesuvius, Ischia and Procida islands, did not allow a conclusive identification of the near-source equivalents of these tephra markers. Here we present a comprehensive characterization of four pyroclastic units from the Campanian Plain, comprising major and trace element glass compositions, Srsingle bondNd isotopes and40Ar/39Ar dating. Our data allowed the identification of the medial equivalents of the MIS 5 tephra markers, including the widespread C-22, X-5, and X-6 tephra, and their assignment to previously undocumented Campi Flegrei activity between 109 and 92 ka. In addition to substantially extending Campi Flegrei explosive activity deeper in time, and thus providing the basis for a revaluation of its history, our findings provide new precise radioisotopic dating to better constrain the chronology of the millennial scale climatic oscillations of the MIS 5c-d in the Mediterranean area and possibly on a larger scale.