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

Abstract

Abstract. Tephra layers produced by volcanic eruptions are widely used for correlation and dating of various deposits and landforms, for synchronization of disparate paleoenvironmental archives, and for reconstruction of magma origin. Here we present our original database TephraKam, which includes chemical compositions of volcanic glass in tephra and welded tuffs from the Kamchatka volcanic arc. The database contains 7049 major element analyses obtained by electron microprobe and 738 trace element analyses obtained by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) on 487 samples collected in proximity of their volcanic sources in all volcanic zones in Kamchatka. The samples characterize about 300 explosive eruptions, which occurred in Kamchatka from the Pliocene until historic times. Precise or estimated ages for all samples are based on published 39Ar/40Ar dates of rocks and 14C dates of host sediments, statistical age modelling and geologic relationships with dated units. All data in TephraKam is supported by information about source volcanoes and analytical details. Using the data, we present an overview of geochemical variations of Kamchatka volcanic glasses and discuss application of this data for precise identification of tephra layers, their source volcanoes, temporal and spatial geochemical variations of pyroclastic rocks in Kamchatka. The data files described in this paper are available on ResearchGate at https://doi.org/10.13140/RG.2.2.23627.13606 (Portnyagin et al., 2019).

Middle to late Pleistocene record of explosive volcanic eruptions in marine sediments offshore Kamchatka (Meiji Rise, NW Pacific)

“…[Color figure can be viewed at wileyonlinelibrary.com] volcanoes for only eight tephra layers under study (WP1, WP4, WP5, WP6, WP9, WP11, WP14 and WPL2). For this identification, we used our extensive database of the Kamchatka proximal tephra compositions and earlier published data (Kyle et al, 2011;Ponomareva et al, 2013aPonomareva et al, ,b, 2015bPonomareva et al, , 2017Derkachev et al, 2018;Portnyagin et al, 2019). To support our correlations, we are provide our unpublished geochemical data for proximal material for the Gorely, Opala and Karymsky volcanic centers (Supporting Information Tables S5 and S6).…”

“…We present an age model for the core based on paleomagnetic and stratigraphic studies as well as single‐shard electron microprobe and laser ablation inductively coupled mass spectrometry (LA‐ICP‐MS) data for most of the tephras. These geochemical data have allowed us to suggest source volcanic zones and volcanoes for some tephras under study based on the known chemical zoning of volcanic products (Volynets et al ., ) and our database for proximal pyroclastic deposits (Portnyagin et al ., ). The obtained tephra sequence presents the first documented continuous late Pleistocene record of large Kamchatkan explosive eruptions and a tephrochronological model for NW Pacific marine sediments.…”