Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone
Cryptotephra deposits (non-visible volcanic ash beds) may extend thousands of kilometres and provide valuable chronological isochrons. Here, we present a Lateglacial-early Holocene (c. 16,500 cal yr BP-6000 cal yr BP) tephrostratigraphy from Hooker's Point, East Falkland, South Atlantic. This p...
Published in: | Quaternary Geochronology |
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Language: | English |
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Online Access: | https://eprints.soton.ac.uk/429210/ https://eprints.soton.ac.uk/429210/1/Falkland_s_tephra_Manuscript_Final_.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:429210 2023-07-30T04:07:04+02:00 Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone Monteath, A.J. Hughes, P.D.M. Wastegård, S. 2019-04-01 text https://eprints.soton.ac.uk/429210/ https://eprints.soton.ac.uk/429210/1/Falkland_s_tephra_Manuscript_Final_.pdf en English eng https://eprints.soton.ac.uk/429210/1/Falkland_s_tephra_Manuscript_Final_.pdf Monteath, A.J., Hughes, P.D.M. and Wastegård, S. (2019) Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone. Quaternary Geochronology, 51, 64-71. (doi:10.1016/j.quageo.2019.01.003 <http://dx.doi.org/10.1016/j.quageo.2019.01.003>). cc_by_nc_nd_4 Article PeerReviewed 2019 ftsouthampton https://doi.org/10.1016/j.quageo.2019.01.003 2023-07-09T22:28:26Z Cryptotephra deposits (non-visible volcanic ash beds) may extend thousands of kilometres and provide valuable chronological isochrons. Here, we present a Lateglacial-early Holocene (c. 16,500 cal yr BP-6000 cal yr BP) tephrostratigraphy from Hooker's Point, East Falkland, South Atlantic. This period spans the last glacial termination across the southern mid-latitudes, a time period during which the palaeoenvironmental record is poorly resolved in southern South America and the South Atlantic. The development of a regional tephrostratigraphy will provide chronological constraint for palaeoenvironmental records from this period. Two cryptotephra deposits from Hooker's Point are linked with Mt. Burney, including the early-Holocene MB 1 tephra, while a third is likely to be derived from the R 1 eruption of Reclus volcano. The high shard abundance of these cryptotephra deposits suggests they extend further into the Southern Ocean, and may act as regional stratigraphic markers during the Lateglacial. Further peaks in shard abundance are composed of detrital glass (tephra not derived from primary air fall events), with mixed shard morphologies and geochemically heterogeneous glass populations. This detrital glass is likely to have been repeatedly reworked by wind action in the Patagonian Steppe before final deposition in the Falkland Islands. The high abundance of detrital glass in the Hooker's Point sequence suggests long distance transport of reworked tephra is common in this region, and highlights the need to carefully analyse cryptotephra deposits in order to avoid incorrectly describing reworked tephra as new isochrons. A temporal pattern of shard abundance is apparent in the Hooker's Point sequence with a reduction/absence of shards between 14,300–10,500 cal yr BP. Article in Journal/Newspaper Southern Ocean University of Southampton: e-Prints Soton Southern Ocean Austral Reclus ENVELOPE(-61.783,-61.783,-64.567,-64.567) Quaternary Geochronology 51 64 71 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Cryptotephra deposits (non-visible volcanic ash beds) may extend thousands of kilometres and provide valuable chronological isochrons. Here, we present a Lateglacial-early Holocene (c. 16,500 cal yr BP-6000 cal yr BP) tephrostratigraphy from Hooker's Point, East Falkland, South Atlantic. This period spans the last glacial termination across the southern mid-latitudes, a time period during which the palaeoenvironmental record is poorly resolved in southern South America and the South Atlantic. The development of a regional tephrostratigraphy will provide chronological constraint for palaeoenvironmental records from this period. Two cryptotephra deposits from Hooker's Point are linked with Mt. Burney, including the early-Holocene MB 1 tephra, while a third is likely to be derived from the R 1 eruption of Reclus volcano. The high shard abundance of these cryptotephra deposits suggests they extend further into the Southern Ocean, and may act as regional stratigraphic markers during the Lateglacial. Further peaks in shard abundance are composed of detrital glass (tephra not derived from primary air fall events), with mixed shard morphologies and geochemically heterogeneous glass populations. This detrital glass is likely to have been repeatedly reworked by wind action in the Patagonian Steppe before final deposition in the Falkland Islands. The high abundance of detrital glass in the Hooker's Point sequence suggests long distance transport of reworked tephra is common in this region, and highlights the need to carefully analyse cryptotephra deposits in order to avoid incorrectly describing reworked tephra as new isochrons. A temporal pattern of shard abundance is apparent in the Hooker's Point sequence with a reduction/absence of shards between 14,300–10,500 cal yr BP. |
format |
Article in Journal/Newspaper |
author |
Monteath, A.J. Hughes, P.D.M. Wastegård, S. |
spellingShingle |
Monteath, A.J. Hughes, P.D.M. Wastegård, S. Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone |
author_facet |
Monteath, A.J. Hughes, P.D.M. Wastegård, S. |
author_sort |
Monteath, A.J. |
title |
Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone |
title_short |
Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone |
title_full |
Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone |
title_fullStr |
Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone |
title_full_unstemmed |
Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone |
title_sort |
evidence for distal transport of reworked andean tephra: extending the cryptotephra framework from the austral volcanic zone |
publishDate |
2019 |
url |
https://eprints.soton.ac.uk/429210/ https://eprints.soton.ac.uk/429210/1/Falkland_s_tephra_Manuscript_Final_.pdf |
long_lat |
ENVELOPE(-61.783,-61.783,-64.567,-64.567) |
geographic |
Southern Ocean Austral Reclus |
geographic_facet |
Southern Ocean Austral Reclus |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://eprints.soton.ac.uk/429210/1/Falkland_s_tephra_Manuscript_Final_.pdf Monteath, A.J., Hughes, P.D.M. and Wastegård, S. (2019) Evidence for distal transport of reworked Andean tephra: extending the cryptotephra framework from the Austral volcanic zone. Quaternary Geochronology, 51, 64-71. (doi:10.1016/j.quageo.2019.01.003 <http://dx.doi.org/10.1016/j.quageo.2019.01.003>). |
op_rights |
cc_by_nc_nd_4 |
op_doi |
https://doi.org/10.1016/j.quageo.2019.01.003 |
container_title |
Quaternary Geochronology |
container_volume |
51 |
container_start_page |
64 |
op_container_end_page |
71 |
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1772820157734846464 |