Early Holocene M~6 explosive eruption from Plosky volcanic massif (Kamchatka) and its tephra as a link between terrestrial and marine paleoenvironmental records
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- 作者：Vera Ponomareva (1)
Maxim Portnyagin (2) (3)
Alexander Derkachev (4)
I. Florin Pendea (5)
Joanne Bourgeois (6)
Paula J. Reimer (7)
Dieter Garbe-Sch?nberg (8)
Stepan Krasheninnikov (3)
Dirk Nürnberg (2) - 关键词：Tephra ; Kamchatka ; Marine cores ; Bering Sea ; Isochrones
- 刊名：International Journal of Earth Sciences
- 出版年：2013
- 出版时间：September 2013
- 年：2013
- 卷：102
- 期：6
- 页码：1673-1699
- 全文大小：1991KB
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Maxim Portnyagin (2) (3)
Alexander Derkachev (4)
I. Florin Pendea (5)
Joanne Bourgeois (6)
Paula J. Reimer (7)
Dieter Garbe-Sch?nberg (8)
Stepan Krasheninnikov (3)
Dirk Nürnberg (2)
1. Institute of Volcanology and Seismology, Petropavlovsk-Kamchatsky, Russia
2. Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR), Kiel, Germany
3. V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry, Moscow, Russia
4. V.I.Il’ichev Pacific Oceanological Institute, Vladivostok, Russia
5. Department of Interdisciplinary Studies, Lakehead University, Orillia, ON, Canada
6. Department of Earth and Space Sciences, University of Washington, Seattle, WA, USA
7. School of Geography, Archaeology and Palaeoecology, Queen’s University Belfast, Belfast, Northern Ireland, UK
8. Institute of Geoscience, Christian-Albrechts-University of Kiel, 24118, Kiel, Germany
文摘
We report tephrochronological and geochemical data on early Holocene activity from Plosky volcanic massif in the Kliuchevskoi volcanic group, Kamchatka Peninsula. Explosive activity of this volcano lasted for ~1.5?kyr, produced a series of widely dispersed tephra layers, and was followed by profuse low-viscosity lava flows. This eruptive episode started a major reorganization of the volcanic structures in the western part of the Kliuchevskoi volcanic group. An explosive eruption from Plosky (M~6), previously unstudied, produced tephra (coded PL2) of a volume of 10-2?km3 (11-3 Gt), being one of the largest Holocene explosive eruptions in Kamchatka. Characteristic diagnostic features of the PL2 tephra are predominantly vitric sponge-shaped fragments with rare phenocrysts and microlites of plagioclase, olivine and pyroxenes, medium- to high-K basaltic andesitic bulk composition, high-K, high-Al and high-P trachyandesitic glass composition with SiO2?=?57.5-9.5 wt%, K2O?=?2.3-.7 wt%, Al2O3?=?15.8-6.5 wt%, and P2O5?=?0.5-.7 wt%. Other diagnostic features include a typical subduction-related pattern of incompatible elements, high concentrations of all REE (>10× mantle values), moderate enrichment in LREE (La/Yb?~?5.3), and non-fractionated mantle-like pattern of LILE. Geochemical fingerprinting of the PL2 tephra with the help of EMP and LA-ICP-MS analyses allowed us to map its occurrence in terrestrial sections across Kamchatka and to identify this layer in Bering Sea sediment cores at a distance of >600?km from the source. New high-precision 14C dates suggest that the PL2 eruption occurred ~10,200?cal BP, which makes it a valuable isochrone for early Holocene climate fluctuations and permits direct links between terrestrial and marine paleoenvironmental records. The terrestrial and marine 14C dates related to the PL2 tephra have allowed us to estimate an early Holocene reservoir age for the western Bering Sea at 1,410?±?64 14C years. Another important tephra from the early Holocene eruptive episode of Plosky volcano, coded PL1, was dated at 11,650?cal BP. This marker is the oldest geochemically characterized and dated tephra marker layer in Kamchatka to date and is an important local marker for the Younger Dryas—early Holocene transition. One more tephra from Plosky, coded PL3, can be used as a marker northeast of the source at a distance of ~110?km.