Itrax μ‐XRF core scanning for rapid tephrostratigraphic analysis: a case study from the Auckland Volcanic Field maar lakes

Peti, Leonie; Gadd, Patricia; Hopkins, Jenni L.; Augustinus, Paul

doi:10.1002/jqs.3133

Cited by 15 publications

(15 citation statements)

References 39 publications

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“…Peti et al . (2020) highlight the potential of using Itrax micro X‐ray fluorescence (µ‐XRF) as a fast, non‐invasive method to chemically characterise tephra layers, and trial the technique on rhyolitic tephras in sediment cores from maar lakes in the Auckland Volcanic Field, New Zealand. They show that element ratios from the µ‐XRF data, such as Sr/Rb and Si/K, can be used to distinguish between different rhyolitic tephra layers from New Zealand (within the scope of the study).…”

Section: Theme 2: Innovative Tools For the Tephrochronological Toolboxmentioning

confidence: 99%

“…The tools available to tephrochronologists are constantly advancing and, alongside studies focussed on the varied applications of tephrochronology, this special issue showcases a number of newly developed analytical and interpretative tools. Peti et al (2020) highlight the potential of using Itrax micro X-ray fluorescence (µ-XRF) as a fast, non-invasive method to chemically characterise tephra layers, and trial the technique on rhyolitic tephras in sediment cores from maar lakes in the Auckland Volcanic Field, New Zealand. They show that element ratios from the µ-XRF data, such as Sr/Rb and Si/K, can be used to distinguish between different rhyolitic tephra layers from New Zealand (within the scope of the study).…”

Section: Theme 1: Tephrochronological Perspectivesmentioning

confidence: 99%

“…(23) (15) South East Asia (Bouvet de la Maisonneuve and Bergal-Kuvikas (2020) (16) Aira caldera, Japan (Nishizawa and Suzuki, 2020) (17) Aso caldera, Japan (Miyabuchi and Sugiyama, 2020) (18) Lake Suigetsu, Japan (Maruyama et al, 2020) (19) Tohoku area, Japan (Suzuki et al, 2020) (20) Towada volcano, Japan (Ishimura and Hiramine, 2020) (21) Kamchatka Peninsula, Russia (Zelenin et al, 2020) (22) Meiji Rise, NW Pacific Ocean (Derkachev et al, 2020) (23) Auckland Volcanic Field, New Zealand (Peti et al, 2020) show that the eruptives can be distinguished using their glass geochemistry, thereby providing a key reference dataset to aid the identification of distal deposits.…”

Section: Theme 1: Tephrochronological Perspectivesmentioning

confidence: 99%

See 2 more Smart Citations

Crossing new frontiers: extending tephrochronology as a global geoscientific research tool

Abbott

Jensen

Lowe

et al. 2020

J Quaternary Science

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Section: Theme 2: Innovative Tools For the Tephrochronological Toolboxmentioning

confidence: 99%

Section: Theme 1: Tephrochronological Perspectivesmentioning

confidence: 99%

Section: Theme 1: Tephrochronological Perspectivesmentioning

confidence: 99%

See 1 more Smart Citation

Crossing new frontiers: extending tephrochronology as a global geoscientific research tool

Abbott

Jensen

Lowe

et al. 2020

J Quaternary Science

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“…Grain-size was not used to assess componentry. Additionally, elemental composition for each macro tephra layer was obtained from µXRF (e.g., Vogel et al, 2010;Kylander et al, 2012;Peti et al, 2019). PCA was used to aid correlation among tephra beds by visualising the distribution of the samples' elemental composition in a lowdimensional space.…”

Section: Tephra Layer Identificationmentioning

confidence: 99%

Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador

Arcusa

Schneider

Mosquera

et al. 2020

andgeo

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Lakes located downwind of active volcanoes serve as a natural repository for volcanic ash (tephra) produced during eruptive events. In this study, sediment cores from four lakes in Cajas National Park, southern Ecuador, situated approximately 200 km downwind of active volcanoes in the Northern Andes Volcanic Zone, were analysed to document the regional history of tephra fall extending back around 3,000 a cal BP. The ages of the lacustrine sedimentary sequences were constrained using a total of 20 AMS radiocarbon ages on plant remains. The tephra layers were correlated among the lakes based on their radiocarbon age, elemental composition, colour, and grain morphology. We found five unique tephra layers, each at least 0.2 cm thick, and further constrained their ages by combining the results from two age-depth modelling approaches (clam and rbacon). The tephra layers were deposited 3,034±621, 2,027±41, 1,557±177, 733±112, and 450±70 a cal BP. The ages of all but the youngest tephra layer overlap with those of known eruptions from Tungurahua. Some tephra layers are missing as macroscopic layers in several cores, with only two of the five tephra layers visible in the sediment of three lakes. Likewise, previous studies of lake sediment cores from the region are missing the four youngest tephra layers, further highlighting the need to sample multiple lakes to reconstruct a comprehensive history of fallout events. The newly documented stratigraphic marker layers will benefit future studies of lake sediments in Cajas National Park.

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“…Nelson et al, 1985;Carter et al, 1995;Alloway et al, 2005;Allan et al, 2008;Lowe, 2014;Hopkins et al, 2020) (2) Lacustrine (e.g. Lowe, 1988;Shane and Hoverd, 2002;Molloy et al, 2009;Shane et al, 2013;Hopkins et al, 2015Hopkins et al, , 2017Peti et al, 2020) (3) Bog settings (e.g. Lowe, 1988;Newnham et al, 1995Newnham et al, , 2007Newnham et al, , 2019Lowe et al, 1999Lowe et al, , 2013Gehrels et al, 2006), or (4) within terrestrially exposed (commonly marine or riverine) sediments, for example in the -Whanganui Basin (e.g.…”

Section: Geologic Settingmentioning

confidence: 99%

TephraNZ: a major and trace element reference dataset for prominent Quaternary rhyolitic tephras in New Zealand and implications for correlation

Hopkins

Bidmead

Lowe

et al. 2020

Preprint

Self Cite

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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 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 twenty-three proximal and twenty-seven distal tephra samples characterising 45 eruptive episodes ranging from Kaharoa (636 &pm; 12 cal. yrs BP) to the Hikuroa Pumice member (2.0 &pm; 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 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, FeOt (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, Okaia, and Unit L (of the Mangaone subgroup eruption sequence). Other characteristics can be used to separate and distinguish all of these otherwise-similar eruptives 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 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 geochemically fingerprint.

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Itrax μ‐XRF core scanning for rapid tephrostratigraphic analysis: a case study from the Auckland Volcanic Field maar lakes

Cited by 15 publications

References 39 publications

Crossing new frontiers: extending tephrochronology as a global geoscientific research tool

Crossing new frontiers: extending tephrochronology as a global geoscientific research tool

Late Holocene tephrostratigraphy from Cajas National Park, southern Ecuador

TephraNZ: a major and trace element reference dataset for prominent Quaternary rhyolitic tephras in New Zealand and implications for correlation

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