Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer
Abstract Nondestructive magnetic detection of tephra layers in ice cores will be an important method to identify and correlate stratigraphic horizons of ice bearing volcanic ash particles. Volcanic ash particles were extracted from tephra-bearing ice samples collected from Nansen Ice Field south of...
Main Authors: | , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
figshare
2016
|
Subjects: | |
Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.3641825.v1 https://springernature.figshare.com/collections/Volcanic_ash_in_bare_ice_south_of_S_r_Rondane_Mountains_Antarctica_geochemistry_rock_magnetism_and_nondestructive_magnetic_detection_with_SQUID_gradiometer/3641825/1 |
id |
ftdatacite:10.6084/m9.figshare.c.3641825.v1 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.6084/m9.figshare.c.3641825.v1 2023-05-15T13:34:59+02:00 Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer Hirokuni Oda Isoji Miyagi Kawai, Jun Suganuma, Yusuke Funaki, Minoru Imae, Naoya Mikouchi, Takashi Matsuzaki, Takuya Yuhji Yamamoto 2016 https://dx.doi.org/10.6084/m9.figshare.c.3641825.v1 https://springernature.figshare.com/collections/Volcanic_ash_in_bare_ice_south_of_S_r_Rondane_Mountains_Antarctica_geochemistry_rock_magnetism_and_nondestructive_magnetic_detection_with_SQUID_gradiometer/3641825/1 unknown figshare https://dx.doi.org/10.1186/s40623-016-0415-3 https://dx.doi.org/10.6084/m9.figshare.c.3641825 CC BY 4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Space Science 29999 Physical Sciences not elsewhere classified FOS Physical sciences Microbiology FOS Biological sciences Molecular Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology Cancer Collection article 2016 ftdatacite https://doi.org/10.6084/m9.figshare.c.3641825.v1 https://doi.org/10.1186/s40623-016-0415-3 https://doi.org/10.6084/m9.figshare.c.3641825 2021-11-05T12:55:41Z Abstract Nondestructive magnetic detection of tephra layers in ice cores will be an important method to identify and correlate stratigraphic horizons of ice bearing volcanic ash particles. Volcanic ash particles were extracted from tephra-bearing ice samples collected from Nansen Ice Field south of the Sør Rondane Mountains, Antarctica. Particles are fresh glassy volcanic ash with diameters of ~50 μm, and chemical composition of the matrix glass belongs to a low-K basaltic andesite group, ranging from SiO2 60–62 wt% and K2O 0.40–0.50 wt%. Considering the grain size of ash particles and chemical composition of volcanic glass, the ash in tephra-bearing ice samples might be originated from the South Sandwich Islands located 2800 km northwest of the sampling sites. Correlations on major element concentrations with tephra layers associated with South Sandwich Islands in EPICA-Dome C, Vostok, and Dome Fuji ice cores show high similarity. Rock magnetic experiments show that the magnetic mineral is pseudo-single-domain titanomagnetite with ulvospinel content of 0.2–0.35 mixed with single-domain to superparamagnetic (titano)magnetite. Small blocks of the tephra-bering ice were measured with a SQUID gradiometer at 1-mm intervals with a spatial resolution of ~3 mm. With DC magnetic field of 25 mT, magnetic signal could be enhanced and detected for all the samples including the one with invisible amount of tephra particles. In order to simulate a thin ash layer in ice core, volcanic ash particles extracted from the tephra-bearing ice were used to fabricate a thin ash layer, which were subsequently magnetized, measured with the gradiometer. The noise level for Z axis gradiometer was about 0.6 pT. Detection limit for a half-cylinder with 29 mm radius and a thickness of 1 mm uniformly magnetized in X axis direction is ~9 × 10−5 A/m, which could be improved down to ~2 × 10−6 A/m by reducing the sensor-to-sample distance to 0.5 mm. Article in Journal/Newspaper Antarc* Antarctica EPICA ice core South Sandwich Islands DataCite Metadata Store (German National Library of Science and Technology) Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Sandwich Islands South Sandwich Islands Sør Rondane Mountains ENVELOPE(25.000,25.000,-72.000,-72.000) Sør-Rondane ENVELOPE(25.000,25.000,-72.000,-72.000) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Space Science 29999 Physical Sciences not elsewhere classified FOS Physical sciences Microbiology FOS Biological sciences Molecular Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology Cancer |
spellingShingle |
Space Science 29999 Physical Sciences not elsewhere classified FOS Physical sciences Microbiology FOS Biological sciences Molecular Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology Cancer Hirokuni Oda Isoji Miyagi Kawai, Jun Suganuma, Yusuke Funaki, Minoru Imae, Naoya Mikouchi, Takashi Matsuzaki, Takuya Yuhji Yamamoto Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer |
topic_facet |
Space Science 29999 Physical Sciences not elsewhere classified FOS Physical sciences Microbiology FOS Biological sciences Molecular Biology 59999 Environmental Sciences not elsewhere classified FOS Earth and related environmental sciences 39999 Chemical Sciences not elsewhere classified FOS Chemical sciences Ecology Cancer |
description |
Abstract Nondestructive magnetic detection of tephra layers in ice cores will be an important method to identify and correlate stratigraphic horizons of ice bearing volcanic ash particles. Volcanic ash particles were extracted from tephra-bearing ice samples collected from Nansen Ice Field south of the Sør Rondane Mountains, Antarctica. Particles are fresh glassy volcanic ash with diameters of ~50 μm, and chemical composition of the matrix glass belongs to a low-K basaltic andesite group, ranging from SiO2 60–62 wt% and K2O 0.40–0.50 wt%. Considering the grain size of ash particles and chemical composition of volcanic glass, the ash in tephra-bearing ice samples might be originated from the South Sandwich Islands located 2800 km northwest of the sampling sites. Correlations on major element concentrations with tephra layers associated with South Sandwich Islands in EPICA-Dome C, Vostok, and Dome Fuji ice cores show high similarity. Rock magnetic experiments show that the magnetic mineral is pseudo-single-domain titanomagnetite with ulvospinel content of 0.2–0.35 mixed with single-domain to superparamagnetic (titano)magnetite. Small blocks of the tephra-bering ice were measured with a SQUID gradiometer at 1-mm intervals with a spatial resolution of ~3 mm. With DC magnetic field of 25 mT, magnetic signal could be enhanced and detected for all the samples including the one with invisible amount of tephra particles. In order to simulate a thin ash layer in ice core, volcanic ash particles extracted from the tephra-bearing ice were used to fabricate a thin ash layer, which were subsequently magnetized, measured with the gradiometer. The noise level for Z axis gradiometer was about 0.6 pT. Detection limit for a half-cylinder with 29 mm radius and a thickness of 1 mm uniformly magnetized in X axis direction is ~9 × 10−5 A/m, which could be improved down to ~2 × 10−6 A/m by reducing the sensor-to-sample distance to 0.5 mm. |
format |
Article in Journal/Newspaper |
author |
Hirokuni Oda Isoji Miyagi Kawai, Jun Suganuma, Yusuke Funaki, Minoru Imae, Naoya Mikouchi, Takashi Matsuzaki, Takuya Yuhji Yamamoto |
author_facet |
Hirokuni Oda Isoji Miyagi Kawai, Jun Suganuma, Yusuke Funaki, Minoru Imae, Naoya Mikouchi, Takashi Matsuzaki, Takuya Yuhji Yamamoto |
author_sort |
Hirokuni Oda |
title |
Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer |
title_short |
Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer |
title_full |
Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer |
title_fullStr |
Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer |
title_full_unstemmed |
Volcanic ash in bare ice south of Sør Rondane Mountains, Antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with SQUID gradiometer |
title_sort |
volcanic ash in bare ice south of sør rondane mountains, antarctica: geochemistry, rock magnetism and nondestructive magnetic detection with squid gradiometer |
publisher |
figshare |
publishDate |
2016 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.3641825.v1 https://springernature.figshare.com/collections/Volcanic_ash_in_bare_ice_south_of_S_r_Rondane_Mountains_Antarctica_geochemistry_rock_magnetism_and_nondestructive_magnetic_detection_with_SQUID_gradiometer/3641825/1 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(25.000,25.000,-72.000,-72.000) |
geographic |
Dome Fuji Sandwich Islands South Sandwich Islands Sør Rondane Mountains Sør-Rondane |
geographic_facet |
Dome Fuji Sandwich Islands South Sandwich Islands Sør Rondane Mountains Sør-Rondane |
genre |
Antarc* Antarctica EPICA ice core South Sandwich Islands |
genre_facet |
Antarc* Antarctica EPICA ice core South Sandwich Islands |
op_relation |
https://dx.doi.org/10.1186/s40623-016-0415-3 https://dx.doi.org/10.6084/m9.figshare.c.3641825 |
op_rights |
CC BY 4.0 https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.3641825.v1 https://doi.org/10.1186/s40623-016-0415-3 https://doi.org/10.6084/m9.figshare.c.3641825 |
_version_ |
1766059961951977472 |