Distal ash fall from the mid-Holocene eruption of Mount Hudson (H2) discovered in the Falkland Islands: New possibilities for Southern Hemisphere archive synchronisation
Distal ash fall from the mid-Holocene eruption of Mount Hudson (H2) discovered in the Falkland Islands: New possibilities for Southern Hemisphere archive synchronisation
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在福克兰群岛发现的哈德逊山(H2)全新世中期喷发的远端火山灰:南半球档案同步的新可能性
DOI:
10.1016/j.quascirev.2021.107074
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发表时间:
2021
影响因子:
4
通讯作者:
Panaretos P
中科院分区:
文献类型:
--
作者:
Panaretos P
Cryptotephra deposits (microscopic volcanic ash) are important geochronological tools that can be used to synchronize records of past environmental change. Here we report a distal cryptotephra from a Holocene peat sequence (Canopus Hill) in the Falkland Islands, in the South Atlantic. Using geochemical analysis (major- and trace-element) of individual volcanic glass shards, we provide a robust correlation between this cryptotephra and the large mid-Holocene explosive eruption of Mt. Hudson in Patagonia, Chile (H2; ∼3.9 ka cal BP). The occurrence of H2 as a cryptotephra in the Falkland Islands significantly increases the known distribution of this marker horizon to more than 1200 km from the volcano, a threefold increase of its previous known extent. A high-resolution radiocarbon chronology, based on terrestrial plant macrofossils, dates the H2 tephra to 4265 ± 65 cal yr BP, suggesting that the eruption may have occurred slightly earlier than previously reported. The refined age and new geochemical reference dataset will facilitate the identification of the H2 tephra in other distal locations. The high concentration of glass shards in our peat sequence indicates that the H2 tephra may extend well beyond the Falkland Islands and we recommend future studies search for its presence across the sub-Antarctic islands and Antarctic Peninsula as a potentially useful chronological marker.
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DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
N. Pearce;B. Alloway;J. Westgate
通讯作者:
J. Westgate
影响因子:
0.9
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通讯作者:
I. Passariello
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
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通讯作者:
W. Rose
影响因子:
2.7
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通讯作者:
S. Wastegård
影响因子:
2.8
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Науки о Земле
通讯作者:
Науки о Земле