Volcanic activity and its link to glaciation cycles: single-grain age and geochemistry of Early Miocene volcanic glass from ANDRILL AND-2A core, Antarctica
In the frame of the ANtarctic DRILLing Program, volcanic glass fragments were collected from the AND-2A core between ~354 and 765 m below sea floor (mbsf) as accumulations (5–70 vol.%) within sediments. Here, we present the physical characteristics, age and geochemistry of the glass, which enable us...
Published in: | Journal of Volcanology and Geothermal Research |
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Online Access: | http://hdl.handle.net/11568/159345 https://doi.org/10.1016/j.jvolgeores.2012.11.008 |
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ftunivpisairis:oai:arpi.unipi.it:11568/159345 2024-04-21T07:52:29+00:00 Volcanic activity and its link to glaciation cycles: single-grain age and geochemistry of Early Miocene volcanic glass from ANDRILL AND-2A core, Antarctica Nyland RE Panter KS Di Vincenzo G Del Carlo P Tiepolo M Field B Gorsevski P. ROCCHI, SERGIO Nyland, Re Panter, K Rocchi, Sergio Di Vincenzo, G Del Carlo, P Tiepolo, M Field, B Gorsevski, P. 2013 STAMPA http://hdl.handle.net/11568/159345 https://doi.org/10.1016/j.jvolgeores.2012.11.008 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000314857600010 volume:250 firstpage:106 lastpage:128 numberofpages:23 journal:JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH http://hdl.handle.net/11568/159345 doi:10.1016/j.jvolgeores.2012.11.008 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84870840554 info:eu-repo/semantics/article 2013 ftunivpisairis https://doi.org/10.1016/j.jvolgeores.2012.11.008 2024-03-28T01:25:59Z In the frame of the ANtarctic DRILLing Program, volcanic glass fragments were collected from the AND-2A core between ~354 and 765 m below sea floor (mbsf) as accumulations (5–70 vol.%) within sediments. Here, we present the physical characteristics, age and geochemistry of the glass, which enable us to reconstruct Early to Middle Miocene volcanic activity in southern McMurdo Sound and, for the first time, document the response of volcanism to climate change in Antarctica. Glass-rich sediments include muddy-to-fine sandstone and stratified diamictite. Glass varies in color, size, vesicularity, crystal content, angularity, and degree of alteration. The mostly fresh glass exhibits delicate cuspate forms indicating deposition as primary ash fall. 40Ar–39Ar age determinations on individual glass grains are in good agreement with the depositional age model of the sediments (ca. 15.6 to 18.6 Ma), supporting for most of them a primary origin, however, some samples do contain older fragments that indicate glass recycling during times of enhanced glacial erosion. Most glasses are mafic (MgO=3 to 9 wt.%) and vary from hypersthene to nepheline normative with a restricted range in SiO2 (45.2±0.8 wt.%, 1σ) and trace element concentrations typical of the rift-related alkaline rocks in the Erebus Volcanic Province. The glass extends known composition of early phase Mount Morning activity (ca. 11–19 Ma), the only known Early to MiddleMiocene source, to a more mafic end, revealing a previously unknown explosive, strongly alkaline, basaltic phase and the most primitive forms of both strongly alkaline (basanite to phonolite) and moderately alkaline (alkali basalt to trachyte) magma associations. The glass-rich sediments occur in glacimarine sequences that record 56 cycles of glacial advance and retreat. Volcanic response to glacial cyclicity is observed both physically and geochemically in AND-2A glass. Higher glass volumes in sediments correlate with ice minimum conditions between 300 and 800 mbsf. Ratios of Ba to Hf, Nb, La and ... Article in Journal/Newspaper Antarc* Antarctic Antarctica McMurdo Sound ARPI - Archivio della Ricerca dell'Università di Pisa Journal of Volcanology and Geothermal Research 250 106 128 |
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Open Polar |
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ARPI - Archivio della Ricerca dell'Università di Pisa |
op_collection_id |
ftunivpisairis |
language |
English |
description |
In the frame of the ANtarctic DRILLing Program, volcanic glass fragments were collected from the AND-2A core between ~354 and 765 m below sea floor (mbsf) as accumulations (5–70 vol.%) within sediments. Here, we present the physical characteristics, age and geochemistry of the glass, which enable us to reconstruct Early to Middle Miocene volcanic activity in southern McMurdo Sound and, for the first time, document the response of volcanism to climate change in Antarctica. Glass-rich sediments include muddy-to-fine sandstone and stratified diamictite. Glass varies in color, size, vesicularity, crystal content, angularity, and degree of alteration. The mostly fresh glass exhibits delicate cuspate forms indicating deposition as primary ash fall. 40Ar–39Ar age determinations on individual glass grains are in good agreement with the depositional age model of the sediments (ca. 15.6 to 18.6 Ma), supporting for most of them a primary origin, however, some samples do contain older fragments that indicate glass recycling during times of enhanced glacial erosion. Most glasses are mafic (MgO=3 to 9 wt.%) and vary from hypersthene to nepheline normative with a restricted range in SiO2 (45.2±0.8 wt.%, 1σ) and trace element concentrations typical of the rift-related alkaline rocks in the Erebus Volcanic Province. The glass extends known composition of early phase Mount Morning activity (ca. 11–19 Ma), the only known Early to MiddleMiocene source, to a more mafic end, revealing a previously unknown explosive, strongly alkaline, basaltic phase and the most primitive forms of both strongly alkaline (basanite to phonolite) and moderately alkaline (alkali basalt to trachyte) magma associations. The glass-rich sediments occur in glacimarine sequences that record 56 cycles of glacial advance and retreat. Volcanic response to glacial cyclicity is observed both physically and geochemically in AND-2A glass. Higher glass volumes in sediments correlate with ice minimum conditions between 300 and 800 mbsf. Ratios of Ba to Hf, Nb, La and ... |
author2 |
Nyland, Re Panter, K Rocchi, Sergio Di Vincenzo, G Del Carlo, P Tiepolo, M Field, B Gorsevski, P. |
format |
Article in Journal/Newspaper |
author |
Nyland RE Panter KS Di Vincenzo G Del Carlo P Tiepolo M Field B Gorsevski P. ROCCHI, SERGIO |
spellingShingle |
Nyland RE Panter KS Di Vincenzo G Del Carlo P Tiepolo M Field B Gorsevski P. ROCCHI, SERGIO Volcanic activity and its link to glaciation cycles: single-grain age and geochemistry of Early Miocene volcanic glass from ANDRILL AND-2A core, Antarctica |
author_facet |
Nyland RE Panter KS Di Vincenzo G Del Carlo P Tiepolo M Field B Gorsevski P. ROCCHI, SERGIO |
author_sort |
Nyland RE |
title |
Volcanic activity and its link to glaciation cycles: single-grain age and geochemistry of Early Miocene volcanic glass from ANDRILL AND-2A core, Antarctica |
title_short |
Volcanic activity and its link to glaciation cycles: single-grain age and geochemistry of Early Miocene volcanic glass from ANDRILL AND-2A core, Antarctica |
title_full |
Volcanic activity and its link to glaciation cycles: single-grain age and geochemistry of Early Miocene volcanic glass from ANDRILL AND-2A core, Antarctica |
title_fullStr |
Volcanic activity and its link to glaciation cycles: single-grain age and geochemistry of Early Miocene volcanic glass from ANDRILL AND-2A core, Antarctica |
title_full_unstemmed |
Volcanic activity and its link to glaciation cycles: single-grain age and geochemistry of Early Miocene volcanic glass from ANDRILL AND-2A core, Antarctica |
title_sort |
volcanic activity and its link to glaciation cycles: single-grain age and geochemistry of early miocene volcanic glass from andrill and-2a core, antarctica |
publishDate |
2013 |
url |
http://hdl.handle.net/11568/159345 https://doi.org/10.1016/j.jvolgeores.2012.11.008 |
genre |
Antarc* Antarctic Antarctica McMurdo Sound |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Sound |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000314857600010 volume:250 firstpage:106 lastpage:128 numberofpages:23 journal:JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH http://hdl.handle.net/11568/159345 doi:10.1016/j.jvolgeores.2012.11.008 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84870840554 |
op_doi |
https://doi.org/10.1016/j.jvolgeores.2012.11.008 |
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Journal of Volcanology and Geothermal Research |
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250 |
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106 |
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128 |
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