Cryptotephra from Lipari Volcano in the eastern Gulf of Taranto (Italy) as a time marker for paleoclimatic studies

Cryptotephra from Lipari Volcano in the eastern Gulf of Taranto (Italy) as a time marker for paleoclimatic studies
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塔兰托湾东部利帕里火山(意大利)的隐壳虫作为古气候研究的时间标记

DOI:
10.1017/qua.2018.2
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发表时间:
2018
影响因子:
2.3
通讯作者:
Schmiedl
Schmiedl
中科院分区:
地球科学3区
文献类型:
--
作者:
Kutterolf;Sievers;Schindlbeck;Schmiedl

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我们提出了第一个火山玻璃碎片的地球化学指纹的基础上,从东部阿普利亚陆架沉积物在塔兰托(意大利)海湾的火山灰分析。墨西哥湾的高沉积速率是高分辨率古气候研究的理想之地,而这些研究依赖于精确的年龄模型。隐火山灰地层学是一种在缺乏离散火山灰层的情况下对海洋沉积物岩心进行年龄评估的新工具。高分辨率定量分析的玻璃碎片丰度在最高的45厘米的重力核心确定了两个cryptotephras。基于加速器质谱14 C的年龄模型支持的玻璃碎片的微探针分析确定了明显的主要隐火山灰在36厘米bsf(海底以下)作为长英质AD 776 Monte Pilato喷发的利帕里岛,而在1.5厘米bsf较薄的镁铁质火山灰层与AD 1944年喷发的Somma-Vesuvius有关。确定这些火山灰层提供了一个额外的,14 C独立的,地层框架,进一步古气候研究,使我们能够连接地中海气候和水文轨道变化和大规模的大气过程。我们的研究结果强调了定性火山灰地层学在一个高度地球动力学的区域,在那里,仅仅定量的方法已被证明承担了很高的潜力火山灰层和喷发之间的假相关性的重要性。
We present the first tephroanalysis based on geochemical fingerprinting of volcanic glass shards from eastern Apulian shelf sediments in the Gulf of Taranto (Italy). High sedimentation rates in the gulf are ideal for high-resolution paleoclimate studies, which rely on accurate age models. Cryptotephrostratigraphy is a novel tool for the age assessment of marine sediment cores in the absence of discrete tephra layers. High-resolution quantitative analysis of glass shard abundance in the uppermost 45 cm of a gravity core identified two cryptotephras. Microprobe analysis of glass shards supported by an accelerator mass spectrometry 14C–based age model identified the pronounced primary cryptotephra at 36 cm bsf (below sea floor) as the felsic AD 776 Monte Pilato Eruption on the island of Lipari, whereas the thinner, mafic tephra layer at 1.5 cm bsf is associated with the AD 1944 eruption of Somma-Vesuvius. Identifying these tephra layers provides an additional, 14C-independent, stratigraphic framework for further paleoclimatic studies allowing us to link Mediterranean climate and hydrology to orbital variation and large-scale atmospheric processes. Our results underline the importance of qualitative tephrostratigraphy in a highly geodynamic region, where solely quantitative approaches have demonstrated to bear a high potential for false correlations between tephra layers and eruptions.
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