Geochemical signatures of tephras from Quaternary Antarctic Peninsula volcanoes

In the northern Antarctic Peninsula area, at least 12 Late Plelstocene-Holocene volcanic centers could be potential sources of tephra layers in the region. We present unique geochemical fingerprints for ten of these volcanoes using major, trace, rare earth element, and isotope data from 95 samples o...

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Autores principales:	Kraus,Stefan, Kurbatov,Andrei, Yates,Martin
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2013
Materias:	Late Pleistocene Holocene Explosive volcanism Tephra Source volcano identification Geochemical fingerprint Antarctic Peninsula Bransfield Rift Larsen Rift
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000100001
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spelling	oai:scielo:S0718-710620130001000012014-09-08Geochemical signatures of tephras from Quaternary Antarctic Peninsula volcanoesKraus,StefanKurbatov,AndreiYates,Martin Late Pleistocene Holocene Explosive volcanism Tephra Source volcano identification Geochemical fingerprint Antarctic Peninsula Bransfield Rift Larsen Rift In the northern Antarctic Peninsula area, at least 12 Late Plelstocene-Holocene volcanic centers could be potential sources of tephra layers in the region. We present unique geochemical fingerprints for ten of these volcanoes using major, trace, rare earth element, and isotope data from 95 samples of tephra and other eruption products. The volcanoes have predominantly basaltic and basaltic andesitic compositions. The Nb/Y ratio proves useful to distinguish between volcanic centers located on the eastern (Larsen Rift) and those situated on the western side (Bransfield Rift) of the Antarctic Peninsula. In addition, the Sr/Nb ratio (for samples with SiO2 <63 wt%), along with Sr/Y, Ba/La, Zr/Hf and Th/Nb are suitable to unequivocally characterize material erupted from every studied volcanic center. Microprobe analyses on volcanic glass show that the samples are generally very poor in K2O, and that glass from Bransfield Rift volcanoes is enriched in SiO2, while that of Larsen Rift volcanoes tends towards elevated alkali contents. We propose an algorithm for the identification of the source volcano of a given tephra layer using the new geochemical fingerprints. This will contribute to the development of a regional tephrochronological framework needed for future correlations of tephra in climate archives (e.g., marine, lacustrine and ice cores).info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.40 n.1 20132013-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000100001en10.5027/andgeoV40n1-a01
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Late Pleistocene Holocene Explosive volcanism Tephra Source volcano identification Geochemical fingerprint Antarctic Peninsula Bransfield Rift Larsen Rift
spellingShingle	Late Pleistocene Holocene Explosive volcanism Tephra Source volcano identification Geochemical fingerprint Antarctic Peninsula Bransfield Rift Larsen Rift Kraus,Stefan Kurbatov,Andrei Yates,Martin Geochemical signatures of tephras from Quaternary Antarctic Peninsula volcanoes
description	In the northern Antarctic Peninsula area, at least 12 Late Plelstocene-Holocene volcanic centers could be potential sources of tephra layers in the region. We present unique geochemical fingerprints for ten of these volcanoes using major, trace, rare earth element, and isotope data from 95 samples of tephra and other eruption products. The volcanoes have predominantly basaltic and basaltic andesitic compositions. The Nb/Y ratio proves useful to distinguish between volcanic centers located on the eastern (Larsen Rift) and those situated on the western side (Bransfield Rift) of the Antarctic Peninsula. In addition, the Sr/Nb ratio (for samples with SiO2 <63 wt%), along with Sr/Y, Ba/La, Zr/Hf and Th/Nb are suitable to unequivocally characterize material erupted from every studied volcanic center. Microprobe analyses on volcanic glass show that the samples are generally very poor in K2O, and that glass from Bransfield Rift volcanoes is enriched in SiO2, while that of Larsen Rift volcanoes tends towards elevated alkali contents. We propose an algorithm for the identification of the source volcano of a given tephra layer using the new geochemical fingerprints. This will contribute to the development of a regional tephrochronological framework needed for future correlations of tephra in climate archives (e.g., marine, lacustrine and ice cores).
author	Kraus,Stefan Kurbatov,Andrei Yates,Martin
author_facet	Kraus,Stefan Kurbatov,Andrei Yates,Martin
author_sort	Kraus,Stefan
title	Geochemical signatures of tephras from Quaternary Antarctic Peninsula volcanoes
title_short	Geochemical signatures of tephras from Quaternary Antarctic Peninsula volcanoes
title_full	Geochemical signatures of tephras from Quaternary Antarctic Peninsula volcanoes
title_fullStr	Geochemical signatures of tephras from Quaternary Antarctic Peninsula volcanoes
title_full_unstemmed	Geochemical signatures of tephras from Quaternary Antarctic Peninsula volcanoes
title_sort	geochemical signatures of tephras from quaternary antarctic peninsula volcanoes
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2013
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062013000100001
work_keys_str_mv	AT krausstefan geochemicalsignaturesoftephrasfromquaternaryantarcticpeninsulavolcanoes AT kurbatovandrei geochemicalsignaturesoftephrasfromquaternaryantarcticpeninsulavolcanoes AT yatesmartin geochemicalsignaturesoftephrasfromquaternaryantarcticpeninsulavolcanoes
_version_	1714205838045872128

Geochemical signatures of tephras from Quaternary Antarctic Peninsula volcanoes

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