根据富西诺沉积物演替得出的 250-315 ka 时间区间的地中海中部火山热年代学数据

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Boreas Pub Date : 2023-10-17 DOI:10.1111/bor.12637
Niklas Leicher, Lorenzo Monaco, Biagio Giaccio, Sebastien Nomade, Alison Pereira, Giorgio Mannella, Sabine Wulf, Gianluca Sottili, Danilo M. Palladino, Giovanni Zanchetta, Bernd Wagner
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引用次数: 0

摘要

在意大利中部富奇诺盆地的湖沼演替 F4-F5 中,在 250-315 ka(海洋同位素阶段 8-9)的时间间隔内发现了 20 个可见的凝灰岩层。其中 15 层含有合适的材料来探索其火山来源。在这些火山碎屑中,发现了罗马火山和罗卡蒙菲纳火山的一些著名喷发和喷发序列,如 Tufo Giallo di Sacrofano 火山和下白曲凝灰岩。此外,沉积物演替记录了萨巴蒂尼、武尔西尼、科利阿尔巴尼和罗卡蒙菲娜火山群在调查期间更为复杂的喷发历史,这是从以前未曾描述过的沉积物中推断出来的。对其中两个检查过的沉积层进行的单晶融合 40Ar/39Ar 测定与两个已经公布的沉积层年龄相结合,为贝叶斯年龄深度模型提供了依据。根据建模的表土年龄,可以对迄今尚未确定的萨巴蒂尼(272.5±4.7、281.8±4.7、308.5±2.8、312.8±2.1 ka)、武尔西尼(311.7±2.3、311.9±2.3 ka)和科利阿尔巴尼(301.0±3.6 ka)火山区的喷发进行年代测定。来自罗马火山的两个未确定火山源的火山灰层的模拟年龄分别为 309.5±2.7 ka 和 310.5±2.6 ka。新的 40Ar/39Ar 和模拟年龄被进一步用于重新评估已知的和已确定年代的喷发单元的时间,如 Tufo Giallo di Sacrofano(40Ar/39Ar:289.3±4.8 ka)。与 Valle Santa Maria、Case Pisello 和 White Trachytic Tuff Unit E3 或 Unit F 初步相关的沉积物为这些喷发提供了模拟年龄,分别为 296.6±3.9、301.8±3.5 和 303.6±3.4 ka。这些结果完成了对距今约 425 ka 的 F4-F5 记录的表层岩层学研究,扩展了地中海表层岩层学框架,为增进对意大利火山爆发活动的了解做出了重要贡献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Central Mediterranean tephrochronology for the time interval 250–315 ka derived from the Fucino sediment succession

Central Mediterranean tephrochronology for the time interval 250–315 ka derived from the Fucino sediment succession

In the lacustrine succession F4-F5 of the Fucino Basin, central Italy, 20 visible tephra layers were identified in the time interval 250–315 ka (Marine Isotope Stages 8–9). Fifteen of them contained suitable material to explore their volcanic sources. Among these tephra some well-known eruptions and eruptive sequences of the Roman and Roccamonfina volcanoes were identified, such as the Tufo Giallo di Sacrofano and the Lower White Trachytic Tuff, respectively. Furthermore, the sediment succession documents a more complex eruptive history of the Sabatini, Vulsini, Colli Albani and Roccamonfina volcanic complexes during the investigated period, as inferred from previously undescribed tephra deposits. Single-crystal-fusion 40Ar/39Ar dating of two of the inspected tephra layers combined with two already published tephra ages provided the basis for a Bayesian age-depth model. The modelled tephra ages allow chronological constraining of so-far undefined eruptions of the Sabatini (272.5±4.7, 281.8±4.7, 308.5±2.8, 312.8±2.1 ka), the Vulsini (311.7±2.3, 311.9±2.3 ka) and the Colli Albani (301.0±3.6 ka) volcanic districts. Two tephra layers of an undefined volcanic source from the Roman volcanoes have modelled ages of 309.5±2.7 and 310.5±2.6 ka. The new 40Ar/39Ar and modelled ages were further used for a reassessment of the timing of already known and dated eruptive units, such as the Tufo Giallo di Sacrofano (40Ar/39Ar: 289.3±4.8 ka). Tephra tentatively correlated with the Valle Santa Maria, Case Pisello and the White Trachytic Tuff Unit E3 or Unit F offer modelled ages for these eruptions of 296.6±3.9, 301.8±3.5 and 303.6±3.4 ka, respectively. The results complete the tephrostratigraphical investigations of the c. 425 ka old F4-F5 record, extend the Mediterranean tephrostratigraphical framework and provide a significant contribution for improving knowledge on Italian volcanic explosive activity.

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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
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