Tephrostratigraphy of proximal pyroclastic sequences at Mount Melbourne (northern Victoria Land, Antarctica): insights into the volcanic activity since the last glacial period
We report on the characterization of a thick sequence of pyroclastic deposits exposed on the summit area and flanks of Mount Melbourne volcano, in northern Victoria Land, Antarctica related to eruptions during the Late Glacial period. We provide a complete characterization of tephra deposits includ...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
2021
|
| _version_ | 1826309114382254080 |
|---|---|
| author | Del Carlo, P Di Roberto, A Di Vincenzo, G Re, G Albert, PG Nazzari, M Smith Johnson, VC Cannata, A |
| author_facet | Del Carlo, P Di Roberto, A Di Vincenzo, G Re, G Albert, PG Nazzari, M Smith Johnson, VC Cannata, A |
| author_sort | Del Carlo, P |
| collection | OXFORD |
| description | We report on the characterization of a thick sequence of pyroclastic deposits exposed on the summit area and flanks of Mount Melbourne volcano, in northern Victoria Land, Antarctica related to eruptions during the Late Glacial period. We provide a complete characterization of tephra deposits including mineralogy, single shard major- and traceelement glass compositions, and an 40Ar- 39Ar age of feldspar crystals extracted from the deposit. The pyroclastic deposits are trachybasaltic to trachytic in composition and are interpreted to have resulted from four Strombolian/Vulcanian to sub Plinian/Plinian eruptions. The younger and more intense sub-Plinian/Plinian eruption (our eruption 2) yielded an 40Ar- 39Ar age of 13.5±4.3 ka (±2σ). The study of Mount Melbourne proximal deposits provides significant new data for the reconstruction of the volcano eruptive history and a better assessment of the volcanic risk connected to a possible future eruption. We also explore geochemical correlations between Mount Melbourne proximal deposits and distal tephra layers recognized in ice cores and blue ice fields of East
Antarctica. A good geochemical match exists between the composition of products from the trachytic sub-Plinian/Plinian eruption 2 and some tephra layers from Talos Dome and shards in Siple Dome which is also compatible in age (c. 9.3 ka) with our 40Ar- 39Ar age determination. Our new insights into the volcanic history of Mount Melbourne and the new high-quality electron microprobe and trace element composition data on its proximal products will help improve future correlations and synchronization of tephra archives in the region. |
| first_indexed | 2024-03-07T07:29:21Z |
| format | Journal article |
| id | oxford-uuid:c12e8940-f62c-4b71-b130-b117c2957a61 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T07:29:21Z |
| publishDate | 2021 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:c12e8940-f62c-4b71-b130-b117c2957a612022-12-21T08:20:28ZTephrostratigraphy of proximal pyroclastic sequences at Mount Melbourne (northern Victoria Land, Antarctica): insights into the volcanic activity since the last glacial periodJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c12e8940-f62c-4b71-b130-b117c2957a61EnglishSymplectic ElementsElsevier2021Del Carlo, PDi Roberto, ADi Vincenzo, GRe, GAlbert, PGNazzari, MSmith Johnson, VCCannata, AWe report on the characterization of a thick sequence of pyroclastic deposits exposed on the summit area and flanks of Mount Melbourne volcano, in northern Victoria Land, Antarctica related to eruptions during the Late Glacial period. We provide a complete characterization of tephra deposits including mineralogy, single shard major- and traceelement glass compositions, and an 40Ar- 39Ar age of feldspar crystals extracted from the deposit. The pyroclastic deposits are trachybasaltic to trachytic in composition and are interpreted to have resulted from four Strombolian/Vulcanian to sub Plinian/Plinian eruptions. The younger and more intense sub-Plinian/Plinian eruption (our eruption 2) yielded an 40Ar- 39Ar age of 13.5±4.3 ka (±2σ). The study of Mount Melbourne proximal deposits provides significant new data for the reconstruction of the volcano eruptive history and a better assessment of the volcanic risk connected to a possible future eruption. We also explore geochemical correlations between Mount Melbourne proximal deposits and distal tephra layers recognized in ice cores and blue ice fields of East Antarctica. A good geochemical match exists between the composition of products from the trachytic sub-Plinian/Plinian eruption 2 and some tephra layers from Talos Dome and shards in Siple Dome which is also compatible in age (c. 9.3 ka) with our 40Ar- 39Ar age determination. Our new insights into the volcanic history of Mount Melbourne and the new high-quality electron microprobe and trace element composition data on its proximal products will help improve future correlations and synchronization of tephra archives in the region. |
| spellingShingle | Del Carlo, P Di Roberto, A Di Vincenzo, G Re, G Albert, PG Nazzari, M Smith Johnson, VC Cannata, A Tephrostratigraphy of proximal pyroclastic sequences at Mount Melbourne (northern Victoria Land, Antarctica): insights into the volcanic activity since the last glacial period |
| title | Tephrostratigraphy of proximal pyroclastic sequences at Mount Melbourne (northern Victoria Land, Antarctica): insights into the volcanic activity since the last glacial period |
| title_full | Tephrostratigraphy of proximal pyroclastic sequences at Mount Melbourne (northern Victoria Land, Antarctica): insights into the volcanic activity since the last glacial period |
| title_fullStr | Tephrostratigraphy of proximal pyroclastic sequences at Mount Melbourne (northern Victoria Land, Antarctica): insights into the volcanic activity since the last glacial period |
| title_full_unstemmed | Tephrostratigraphy of proximal pyroclastic sequences at Mount Melbourne (northern Victoria Land, Antarctica): insights into the volcanic activity since the last glacial period |
| title_short | Tephrostratigraphy of proximal pyroclastic sequences at Mount Melbourne (northern Victoria Land, Antarctica): insights into the volcanic activity since the last glacial period |
| title_sort | tephrostratigraphy of proximal pyroclastic sequences at mount melbourne northern victoria land antarctica insights into the volcanic activity since the last glacial period |
| work_keys_str_mv | AT delcarlop tephrostratigraphyofproximalpyroclasticsequencesatmountmelbournenorthernvictorialandantarcticainsightsintothevolcanicactivitysincethelastglacialperiod AT dirobertoa tephrostratigraphyofproximalpyroclasticsequencesatmountmelbournenorthernvictorialandantarcticainsightsintothevolcanicactivitysincethelastglacialperiod AT divincenzog tephrostratigraphyofproximalpyroclasticsequencesatmountmelbournenorthernvictorialandantarcticainsightsintothevolcanicactivitysincethelastglacialperiod AT reg tephrostratigraphyofproximalpyroclasticsequencesatmountmelbournenorthernvictorialandantarcticainsightsintothevolcanicactivitysincethelastglacialperiod AT albertpg tephrostratigraphyofproximalpyroclasticsequencesatmountmelbournenorthernvictorialandantarcticainsightsintothevolcanicactivitysincethelastglacialperiod AT nazzarim tephrostratigraphyofproximalpyroclasticsequencesatmountmelbournenorthernvictorialandantarcticainsightsintothevolcanicactivitysincethelastglacialperiod AT smithjohnsonvc tephrostratigraphyofproximalpyroclasticsequencesatmountmelbournenorthernvictorialandantarcticainsightsintothevolcanicactivitysincethelastglacialperiod AT cannataa tephrostratigraphyofproximalpyroclasticsequencesatmountmelbournenorthernvictorialandantarcticainsightsintothevolcanicactivitysincethelastglacialperiod |