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Distal tephrochronology in volcanic regions: Challenges and insights from Kamchatkan lake sediments

Plunkett, Gill; Coulter, Sarah E.; Ponomareva, Vera V.; Blaauw, Maarten; Klimaschewski, Andrea and Hammarlund, Dan LU (2015) In Global and Planetary Change 134. p.26-40
Abstract
Kamchatka is one of the world's most active volcanic regions and has hosted many explosive eruptions during the Holocene. These eruptions had the potential to disperse tephra over wide areas, forming time-synchronous markers wherever those tephras are found. Recent research in Kamchatka has begun to focus on the geochemical analysis of individual glass shards in order to characterise tephra layers. We have applied this approach to the study of visible tephras from three lakes - one in central and two in northern Kamchatka - with the aim of identifying key tephras and potential issues in the application of distal (>100 km from an active volcano) tephra in volcanically complex regions. In total, 23 tephras from 22 tephra beds have been... (More)
Kamchatka is one of the world's most active volcanic regions and has hosted many explosive eruptions during the Holocene. These eruptions had the potential to disperse tephra over wide areas, forming time-synchronous markers wherever those tephras are found. Recent research in Kamchatka has begun to focus on the geochemical analysis of individual glass shards in order to characterise tephra layers. We have applied this approach to the study of visible tephras from three lakes - one in central and two in northern Kamchatka - with the aim of identifying key tephras and potential issues in the application of distal (>100 km from an active volcano) tephra in volcanically complex regions. In total, 23 tephras from 22 tephra beds have been geochemically analysed, representing products from at least four volcanic systems in Kamchatka. We demonstrate that distal lake sediments in the region can yield reliable tephrostratigraphies, capturing tephra from eruptions that have the greatest potential to disperse volcanic ash beyond the region. We draw attention to issues relating to correlating and distinguishing key marker horizons from the highly active Shiveluch Volcano, namely the need to ensure inter-lab comparability of geochemical data and good chronological control of the proximal and distal tephras. Importantly, we have also extended the known distribution of two key tephra isochrons from the Ksudach volcano. Our work contributes valuable glass geochemical on data several key marker beds that will facilitate future tephra and palaeoenvironmental research within and beyond Kamchatka. (C) 2015 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Distal tephra, Tephrothronology, Age-modelling, Kamchatka, Holocene
in
Global and Planetary Change
volume
134
pages
26 - 40
publisher
Elsevier
external identifiers
  • wos:000365369900004
  • scopus:84946579804
ISSN
1872-6364
DOI
10.1016/j.gloplacha.2015.04.006
language
English
LU publication?
yes
id
e4fa86af-013c-4bf3-ab91-929243f3d63f (old id 8539654)
date added to LUP
2016-01-20 12:36:54
date last changed
2017-09-24 03:03:27
@article{e4fa86af-013c-4bf3-ab91-929243f3d63f,
  abstract     = {Kamchatka is one of the world's most active volcanic regions and has hosted many explosive eruptions during the Holocene. These eruptions had the potential to disperse tephra over wide areas, forming time-synchronous markers wherever those tephras are found. Recent research in Kamchatka has begun to focus on the geochemical analysis of individual glass shards in order to characterise tephra layers. We have applied this approach to the study of visible tephras from three lakes - one in central and two in northern Kamchatka - with the aim of identifying key tephras and potential issues in the application of distal (>100 km from an active volcano) tephra in volcanically complex regions. In total, 23 tephras from 22 tephra beds have been geochemically analysed, representing products from at least four volcanic systems in Kamchatka. We demonstrate that distal lake sediments in the region can yield reliable tephrostratigraphies, capturing tephra from eruptions that have the greatest potential to disperse volcanic ash beyond the region. We draw attention to issues relating to correlating and distinguishing key marker horizons from the highly active Shiveluch Volcano, namely the need to ensure inter-lab comparability of geochemical data and good chronological control of the proximal and distal tephras. Importantly, we have also extended the known distribution of two key tephra isochrons from the Ksudach volcano. Our work contributes valuable glass geochemical on data several key marker beds that will facilitate future tephra and palaeoenvironmental research within and beyond Kamchatka. (C) 2015 Elsevier B.V. All rights reserved.},
  author       = {Plunkett, Gill and Coulter, Sarah E. and Ponomareva, Vera V. and Blaauw, Maarten and Klimaschewski, Andrea and Hammarlund, Dan},
  issn         = {1872-6364},
  keyword      = {Distal tephra,Tephrothronology,Age-modelling,Kamchatka,Holocene},
  language     = {eng},
  pages        = {26--40},
  publisher    = {Elsevier},
  series       = {Global and Planetary Change},
  title        = {Distal tephrochronology in volcanic regions: Challenges and insights from Kamchatkan lake sediments},
  url          = {http://dx.doi.org/10.1016/j.gloplacha.2015.04.006},
  volume       = {134},
  year         = {2015},
}