气候变化领域集成服务门户(CCPortal): Evidence for a large-magnitude Holocene eruption of Mount Rittmann (Antarctica): A volcanological reconstruction using the marine tephra record

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DOI	10.1016/j.quascirev.2020.106629
	Evidence for a large-magnitude Holocene eruption of Mount Rittmann (Antarctica): A volcanological reconstruction using the marine tephra record
	Di Roberto A.; Albert P.G.; Colizza E.; Del Carlo P.; Di Vincenzo G.; Gallerani A.; Giglio F.; Kuhn G.; Macrì P.; Manning C.J.; Melis R.; Miserocchi S.; Scateni B.; Smith V.C.; Torricella F.; Winkler A.
发表日期	2020
ISSN	0277-3791
卷号	250
英文摘要	In Antarctica, the near-source exposures of volcanic eruption deposits are often limited as they are not well preserved in the dynamic glacial environment, thus making volcanological reconstructions of explosive eruptions extremely challenging. Fortunately, pyroclastic deposits from explosive eruptions are preserved in Southern Ocean sediments surrounding Antarctica, and the tephrostratigraphy of these sequences offers crucial volcanological information including the timing and tempo of past eruptions, their magnitude, and eruption dynamics. Here we report the results of a tephrostratigraphy and tephrochronology study focused on four sediment cores recovered from the Wood Bay area in the western Ross Sea, Antarctica. In all these sedimentary sequences, we found a well-stratified primary tephra of considerable thickness, up to 80 cm, hereafter named the Aviator Tephra (AVT). According to the characteristics of the tephra deposit and its distribution, the AVT was associated with an eruption of considerable intensity, potentially representing one of the largest Holocene eruptions recorded in Antarctica. Based on the major and trace element geochemistry and the mineral assemblage of the tephra, Mount Rittmann was identified as the source of the AVT. A Holocene age of ∼11 ka was determined by radiocarbon dating organic material within the sediments and 40Ar-39Ar dating of alkali-feldspar crystals included in the tephra. Eruption dynamics were initially dominated by hydromagmatic magma fragmentation conditions producing a sustained, relatively wet and ash-rich eruptive cloud. The eruption then evolved into a highly energetic, relatively dry magmatic Plinian eruption. The last phase was characterized by renewed efficient magma-water interaction and/or collapse of the eruptive column producing pyroclastic density currents and associated co-ignimbritic plumes. The distal tephra deposits might be linked to the widespread lag breccia layer previously identified on the rim of the Mount Rittmann caldera which share the same geochemical composition. Diatoms found in the sediments surrounding the AVT and the primary characteristics of the tephra indicate that the Wood Bay area was open sea at the time of the eruption, which is much earlier than previously thought. AVT is also an excellent tephrostratigraphic marker for the Wood Bay area, in the Ross Sea, and a useful marker for future synchronization of continental ice and marine archives in the region. © 2020 Elsevier Ltd
语种	英语
scopus关键词	Deposits; Explosives; Feldspar; Geochemistry; Trace elements; Volcanoes; Geochemical composition; Glacial environments; Magma fragmentation; Major and trace elements; Pyroclastic density currents; Pyroclastic deposits; Sedimentary sequence; Tephrostratigraphy; Sediments; breccia; caldera; collapse structure; geochemistry; Holocene; ice margin; magma; radiocarbon dating; tephrochronology; trace element; volcanic eruption; volcanology; Antarctica; Ross Sea; Southern Ocean; Bacillariophyta
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151231
作者单位	Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Pisa, Via C. Battisti 53, Pisa, 56125, Italy; Department of Geography, College of Science, Swansea University, Singleton Park, Swansea, SA2 8PP, United Kingdom; Research Laboratory for Archaeology and the History of Art, University of Oxford, 1 South Parks RoadOX1 3TG, United Kingdom; Dipartimento di Matematica e Geoscienze, Università di Trieste, Via E. Weiss 2, Trieste, 34127, Italy; Consiglio Nazionale delle Ricerche - Istituto di Geoscienze e Georisorse (CNR-IGG), Via G. Moruzzi 1, Pisa, 56124, Italy; Consiglio Nazionale delle Ricerche - Istituto di Scienze Marine (CNR-Ismar), Via Gobetti, Bologna, 101 40129, Italy; Istituto di Scienze Polari - Consiglio Nazionale delle Ricerche ISP-CNR, Via P. Gobetti 101, Bologna, 40129, Italy; Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Alten Hafen 26, Bremerhaven, D-27568, Germany; Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma 2, Via di Vigna Murata 605, R...
推荐引用方式 GB/T 7714	Di Roberto A.,Albert P.G.,Colizza E.,et al. Evidence for a large-magnitude Holocene eruption of Mount Rittmann (Antarctica): A volcanological reconstruction using the marine tephra record[J],2020,250.
APA	Di Roberto A..,Albert P.G..,Colizza E..,Del Carlo P..,Di Vincenzo G..,...&Winkler A..(2020).Evidence for a large-magnitude Holocene eruption of Mount Rittmann (Antarctica): A volcanological reconstruction using the marine tephra record.Quaternary Science Reviews,250.
MLA	Di Roberto A.,et al."Evidence for a large-magnitude Holocene eruption of Mount Rittmann (Antarctica): A volcanological reconstruction using the marine tephra record".Quaternary Science Reviews 250(2020).