TephraKam: geochemical database of glass compositions in tephra and welded tuffs from the Kamchatka volcanic arc (northwestern Pacific)

Portnyagin, Maxim; Пономарева, В. В.; Zelenin, Egor; Bazanova, L. I.; Певзнер, М. М.; Plechova, A. A.; Rogozin, Aleksei; Garbe‐Schönberg, Dieter

doi:10.5194/essd-12-469-2020

Cited by 36 publications

(47 citation statements)

References 86 publications

(147 reference statements)

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“…This characteristic geochemical signature has been observed in some volcanic glasses from Kamchatka (e.g. Portnyagin et al, 2020). CL-37 is shown here to correlate with the Late Holocene caldera-forming eruption of Opala (OP), Kamchatka (Andrews et al, 2018;Braitseva et al, 1995Braitseva et al, , 1997Kyle et al, 2011;Melekestsev et al, 1992;Plunkett et al, 2015).…”

Section: Cl-37 (Op Tephra)supporting

confidence: 72%

Late Holocene cryptotephra and a provisional 15 000-year Bayesian age model for Cascade Lake, Alaska

2022

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Abstract. Multiple chronometers can be employed for dating Holocene palaeoenvironmental records, each with its own inherent strengths and weaknesses. Radiocarbon dating is one of the most widely used techniques for producing chronologies, but its application at high-latitude sites can sometimes be problematic. Here, cryptotephra were identified in a core from Cascade Lake, Arctic Alaska, and used to identify and resolve an age bias in Late Holocene radiocarbon dates from the top 1.42 m of the sediment sequence. Identifiable geochemical populations of cryptotephra are shown to be present in detectable concentrations in sediment from the north flank of the Brooks Range for the first time. Major-element glass geochemical correlations are demonstrated between ultra-distal cryptotephra and reference samples from the Late Holocene caldera-forming eruption of Opala, Kamchatka, as well as three eruptions in North America: the White River Ash (northern lobe), Ruppert tephra and the Late Holocene caldera-forming eruption of Aniakchak. The correlated ages of these cryptotephra provide evidence for an old-carbon effect and support preliminary palaeomagnetic secular variation (PSV) correlated ages reported for Cascade Lake. Chronological data from Cascade Lake were then combined using a Bayesian approach to generate an age–depth model that extends back through the Late Holocene and provisionally to 15 000 cal yr BP.

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Section: Cl-37 (Op Tephra)supporting

confidence: 72%

Late Holocene cryptotephra and a provisional 15 000-year Bayesian age model for Cascade Lake, Alaska

2022

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“…Considering other coincident large explosive (volcanic explosivity index: VEI > 5) eruptions from southeast to east Asia that have widespread tephra dispersals, there are also some potential source candidates for GST‐314: the 7307–7196 cal a bp Kikai‐Akahoya eruption (K‐Ah, Kikai volcano, Japan), the 6079–5004 cal a bp Pinatubo (Philippines) eruption, the 4894–4827 cal a bp SG14‐0704 tephra recorded in Lake Suigetsu (unknown eruption), the 7340–7180 cal a bp KS 2 tephra from Ksudach caldera (Russia), the 6375–6220 cal a bp IAv12 (AV 4 ) tephra from Avachinsky volcano (Russia), the 7920–7620 cal a bp KHG tephra from Khangar volcano (Russia) and the 5986–5899 cal a bp Towada‐Chuseri eruption (To‐Cu, Towada volcano, Japan) (Ishimura and Hiramine 2020; McLean et al ., 2018; Plunkett et al ., 2015; Ponomareva et al ., 2017; Portnyagin et al ., 2020; Smith et al ., 2013; Sun et al ., 2021). Geochemically, the GST‐314 tephra has a diagnostic glass composition with low potassium content and high silicon content which is consistent only with the To‐Cu tephra and clearly separable from other broadly contemporary tephras (Figs.…”

Section: Resultsmentioning

confidence: 99%

~5.9 cal ka bp Towada‐Chuseri tephra from Towada volcano: a mid‐Holocene marker layer from Japan to northeast China

Sun

Plunkett

Zhu

et al. 2021

J Quaternary Science

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Far‐travelled ash layers from explosive volcanic eruptions can provide invaluable marker horizons for dating and correlating regional to global sedimentary archives. Here, we present a new cryptotephra associated with the ~5.9 cal ka bp Towada‐Chuseri eruption (To‐Cu) in a peat sediment record from northeast China. This tephra exhibits a rhyolitic glass composition that can be distinguished from other widespread tephra layers around the region of Japan and northeast China. Our findings extend the known range of this ash significantly, making it now traceable about 1200 km from its source, Towada volcano, Japan. Notably, this tephra provides an important isochron for synchronising palaeoenvironmental studies during the mid‐Holocene period from the western Pacific, central Japan, Japan Sea and northeast China.

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“…Ideally, a global tephra database would exist, but at present this is beyond the scope and remit of any individual researcher, research group, or institute(s). Therefore separate, regional databases for volcanically active (and other) regions are becoming increasingly popular, such as TephraKam -Kamchatka (Portnyagin et al, 2020); Tephrabase -Europe (Newton, 1996); AntT tephra database -Antarctic ice cores (Kurbatov et al, 2014); Alaska Tephra Database (Wallace, 2018); Klondike goldfields, Yukon (Preece et al, 2011); VOLCORE -DSDP, ODP, and IODP marine tephra deposits (Mahony et al, 2020). In addition, in an effort to produce comparable global datasets Abbott et al (2021) have recently presented guidance for best practices, providing recommendations and templates for tephra collection, sample preparation, and physical and geochemical analysis.…”

Section: Introductionmentioning

confidence: 99%

TephraNZ: a major- and trace-element reference dataset for glass-shard analyses from prominent Quaternary rhyolitic tephras in New Zealand and implications for correlation

et al. 2021

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Abstract. Although analyses of tephra-derived glass shards have been undertaken in New Zealand for nearly four decades (pioneered by Paul Froggatt), our study is the first to systematically develop a formal, comprehensive, open-access reference dataset of glass-shard compositions for New Zealand tephras. These data will provide an important reference tool for future studies to identify and correlate tephra deposits and for associated petrological and magma-related studies within New Zealand and beyond. Here we present the foundation dataset for TephraNZ, an open-access reference dataset for selected tephra deposits in New Zealand. Prominent, rhyolitic, tephra deposits from the Quaternary were identified, with sample collection targeting original type sites or reference locations where the tephra's identification is unequivocally known based on independent dating and/or mineralogical techniques. Glass shards were extracted from the tephra deposits, and major- and trace-element geochemical compositions were determined. We discuss in detail the data reduction process used to obtain the results and propose that future studies follow a similar protocol in order to gain comparable data. The dataset contains analyses of glass shards from 23 proximal and 27 distal tephra samples characterising 45 eruptive episodes ranging from Kaharoa (636 ± 12 cal yr BP) to the Hikuroa Pumice member (2.0 ± 0.6 Ma) from six or more caldera sources, most from the central Taupō Volcanic Zone. We report 1385 major-element analyses obtained by electron microprobe (EMPA), and 590 trace-element analyses obtained by laser ablation (LA)-ICP-MS, on individual glass shards. Using principal component analysis (PCA), Euclidean similarity coefficients, and geochemical investigation, we show that chemical compositions of glass shards from individual eruptions are commonly distinguished by major elements, especially CaO, TiO2, K2O, and FeOtt (Na2O+K2O and SiO2/K2O), but not always. For those tephras with similar glass major-element signatures, some can be distinguished using trace elements (e.g. HFSEs: Zr, Hf, Nb; LILE: Ba, Rb; REE: Eu, Tm, Dy, Y, Tb, Gd, Er, Ho, Yb, Sm) and trace-element ratios (e.g. LILE/HFSE: Ba/Th, Ba/Zr, Rb/Zr; HFSE/HREE: Zr/Y, Zr/Yb, Hf/Y; LREE/HREE: La/Yb, Ce/Yb). Geochemistry alone cannot be used to distinguish between glass shards from the following tephra groups: Taupō (Unit Y in the post-Ōruanui eruption sequence of Taupō volcano) and Waimihia (Unit S); Poronui (Unit C) and Karapiti (Unit B); Rotorua and Rerewhakaaitu; and Kawakawa/Ōruanui, and Okaia. Other characteristics, including stratigraphic relationships and age, can be used to separate and distinguish all of these otherwise-similar tephra deposits except Poronui and Karapiti. Bimodality caused by K2O variability is newly identified in Poihipi and Tahuna tephras. Using glass-shard compositions, tephra sourced from Taupō Volcanic Centre (TVC) and Mangakino Volcanic Centre (MgVC) can be separated using bivariate plots of SiO2/K2O vs. Na2O+K2O. Glass shards from tephras derived from Kapenga Volcanic Centre, Rotorua Volcanic Centre, and Whakamaru Volcanic Centre have similar major- and trace-element chemical compositions to those from the MgVC, but they can overlap with glass analyses from tephras from Taupō and Okataina volcanic centres. Specific trace elements and trace-element ratios have lower variability than the heterogeneous major-element and bimodal signatures, making them easier to fingerprint geochemically.

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TephraKam: geochemical database of glass compositions in tephra and welded tuffs from the Kamchatka volcanic arc (northwestern Pacific)

Cited by 36 publications

References 86 publications

Late Holocene cryptotephra and a provisional 15 000-year Bayesian age model for Cascade Lake, Alaska

Late Holocene cryptotephra and a provisional 15 000-year Bayesian age model for Cascade Lake, Alaska

~5.9 cal ka bp Towada‐Chuseri tephra from Towada volcano: a mid‐Holocene marker layer from Japan to northeast China

TephraNZ: a major- and trace-element reference dataset for glass-shard analyses from prominent Quaternary rhyolitic tephras in New Zealand and implications for correlation

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