Volcanic Events of Ross Island, Antarctica, Based on the Stable Isotope Studies of Drilled Volcanic Rocks
In 1973, DVDP 3 drill hole near McMurdo Station, Ross Island penetrated lava flows and pyroclastics composed of alkaline basalts and reached 381 m. The basal 214 m thick pyroclastic unit consists of basaltic hyaloclastites. Cores contain permafrost ice as layers, filling the vesicles and cementing p...
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National Institute of Polar Research
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ftdoajarticles:oai:doaj.org/article:1956225a0256483784f0cfe86748ee87 2023-05-15T14:03:21+02:00 Volcanic Events of Ross Island, Antarctica, Based on the Stable Isotope Studies of Drilled Volcanic Rocks Nobuyuki NAKAI Yoshihiko MIZUTANI Hideki WADA 1977-03-01T00:00:00Z https://doi.org/10.15094/00007928 https://doaj.org/article/1956225a0256483784f0cfe86748ee87 EN JA eng jpn National Institute of Polar Research http://doi.org/10.15094/00007928 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007928 0085-7289 2432-079X https://doaj.org/article/1956225a0256483784f0cfe86748ee87 Antarctic Record, Iss 58, Pp 277-288 (1977) Geography (General) G1-922 article 1977 ftdoajarticles https://doi.org/10.15094/00007928 2022-12-31T14:53:20Z In 1973, DVDP 3 drill hole near McMurdo Station, Ross Island penetrated lava flows and pyroclastics composed of alkaline basalts and reached 381 m. The basal 214 m thick pyroclastic unit consists of basaltic hyaloclastites. Cores contain permafrost ice as layers, filling the vesicles and cementing pyroclastics. Thenardite and calcite are also present mainly along the icerock interface. The origin of ice and salts was investigated using compositions of stable isotopes to disclose the volcanic events occurred in geologic time. For these purposes, δD, δ^<13>C, δ^<34>S and δ^<18>O were measured using the above-mentioned samples. Theδ^<18>O of ice samples increases substantially with increasing depth, ranging from -35.3‰ near the ground surface to +1.1 ‰ at the bottom of the drill hole. δ^<34>S, δ^<18>O andδ^<13>C values for thenardite and calcite can be divided readily into three groups according to their depth. From the above results, the following conclusions can be obtained. 1) Basaltic hyaloclastites found at a depth of 200 to 381 m were erupted in the submarine volcanism. 2) Lavas and pyoclastics found at a depth of 100 to 200 m were formed under a subglacial and brackish condition, and have undergone strong hydrothermal alteration. 3) Samples from 0 to 100m downhole were erupted in environment quite different from volcanic rocks beneath, suggesting subaerial flow or eruptions. Article in Journal/Newspaper Antarc* Antarctica Ice permafrost Ross Island Directory of Open Access Journals: DOAJ Articles Ross Island McMurdo Station ENVELOPE(166.667,166.667,-77.850,-77.850) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Japanese |
topic |
Geography (General) G1-922 |
spellingShingle |
Geography (General) G1-922 Nobuyuki NAKAI Yoshihiko MIZUTANI Hideki WADA Volcanic Events of Ross Island, Antarctica, Based on the Stable Isotope Studies of Drilled Volcanic Rocks |
topic_facet |
Geography (General) G1-922 |
description |
In 1973, DVDP 3 drill hole near McMurdo Station, Ross Island penetrated lava flows and pyroclastics composed of alkaline basalts and reached 381 m. The basal 214 m thick pyroclastic unit consists of basaltic hyaloclastites. Cores contain permafrost ice as layers, filling the vesicles and cementing pyroclastics. Thenardite and calcite are also present mainly along the icerock interface. The origin of ice and salts was investigated using compositions of stable isotopes to disclose the volcanic events occurred in geologic time. For these purposes, δD, δ^<13>C, δ^<34>S and δ^<18>O were measured using the above-mentioned samples. Theδ^<18>O of ice samples increases substantially with increasing depth, ranging from -35.3‰ near the ground surface to +1.1 ‰ at the bottom of the drill hole. δ^<34>S, δ^<18>O andδ^<13>C values for thenardite and calcite can be divided readily into three groups according to their depth. From the above results, the following conclusions can be obtained. 1) Basaltic hyaloclastites found at a depth of 200 to 381 m were erupted in the submarine volcanism. 2) Lavas and pyoclastics found at a depth of 100 to 200 m were formed under a subglacial and brackish condition, and have undergone strong hydrothermal alteration. 3) Samples from 0 to 100m downhole were erupted in environment quite different from volcanic rocks beneath, suggesting subaerial flow or eruptions. |
format |
Article in Journal/Newspaper |
author |
Nobuyuki NAKAI Yoshihiko MIZUTANI Hideki WADA |
author_facet |
Nobuyuki NAKAI Yoshihiko MIZUTANI Hideki WADA |
author_sort |
Nobuyuki NAKAI |
title |
Volcanic Events of Ross Island, Antarctica, Based on the Stable Isotope Studies of Drilled Volcanic Rocks |
title_short |
Volcanic Events of Ross Island, Antarctica, Based on the Stable Isotope Studies of Drilled Volcanic Rocks |
title_full |
Volcanic Events of Ross Island, Antarctica, Based on the Stable Isotope Studies of Drilled Volcanic Rocks |
title_fullStr |
Volcanic Events of Ross Island, Antarctica, Based on the Stable Isotope Studies of Drilled Volcanic Rocks |
title_full_unstemmed |
Volcanic Events of Ross Island, Antarctica, Based on the Stable Isotope Studies of Drilled Volcanic Rocks |
title_sort |
volcanic events of ross island, antarctica, based on the stable isotope studies of drilled volcanic rocks |
publisher |
National Institute of Polar Research |
publishDate |
1977 |
url |
https://doi.org/10.15094/00007928 https://doaj.org/article/1956225a0256483784f0cfe86748ee87 |
long_lat |
ENVELOPE(166.667,166.667,-77.850,-77.850) |
geographic |
Ross Island McMurdo Station |
geographic_facet |
Ross Island McMurdo Station |
genre |
Antarc* Antarctica Ice permafrost Ross Island |
genre_facet |
Antarc* Antarctica Ice permafrost Ross Island |
op_source |
Antarctic Record, Iss 58, Pp 277-288 (1977) |
op_relation |
http://doi.org/10.15094/00007928 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007928 0085-7289 2432-079X https://doaj.org/article/1956225a0256483784f0cfe86748ee87 |
op_doi |
https://doi.org/10.15094/00007928 |
_version_ |
1766273983912607744 |