Physical properties of some Antarctic meteorites
The intrinsic and bulk densities, porosities and ultrasonic-wave velocities (V_p and V_s) in three mutually perpendicular directions were measured in five antarctic meteorites (ordinary chondrites; ALH-77288,-77294,-78103,-78251 and MET-78003). V_p and V_s measurements were made at the room temperat...
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Geological Institute, Faculty of Science, University of Tokyo
1981
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ftnipr:oai:nipr.repo.nii.ac.jp:00001230 2023-05-15T13:47:59+02:00 Physical properties of some Antarctic meteorites Kiyoshi Yomogida Takafumi Matsui 1981-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1230 http://id.nii.ac.jp/1291/00001230/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1230&item_no=1&attribute_id=18&file_no=1 en eng Geological Institute, Faculty of Science, University of Tokyo https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1230 http://id.nii.ac.jp/1291/00001230/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 20, 384-394(1981-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1230&item_no=1&attribute_id=18&file_no=1 Departmental Bulletin Paper P(論文) 1981 ftnipr 2022-11-12T19:42:05Z The intrinsic and bulk densities, porosities and ultrasonic-wave velocities (V_p and V_s) in three mutually perpendicular directions were measured in five antarctic meteorites (ordinary chondrites; ALH-77288,-77294,-78103,-78251 and MET-78003). V_p and V_s measurements were made at the room temperature and under one atmospheric pressure. Measured V_p and V_s values are fairly smaller than those expected from their mineral compositions except for ALH-77288. High porosity values (∿10%) of the samples, except for that (∿2%) of ALH-77288,are consistent with such low elastic-wave velocities. Degree of decrease in velocity is, however, larger than that expected from spherical pores. Thus, V_p and V_s of chondrites may be controlled by the crack porosity. Very low transmitting efficiency of the shear-wave may also support this view. Velocity anisotropy between transmitting directions is observed in almost all samples. The thermal diffusivity of four antarctic meteorites (ordinary chondrites; ALH-769,-77231,Y-74191 and -74371) was measured under the vacuum condition (below (10)^<-3> mmHg) in the temperature range of 100 to 500K. Thermal diffusivities of chondrites are also smaller than those expected from their mineral compositions and are ascribed to their high porosity values. The thermal diffusivities at 300K are 2.7∿5.0×(10)^<-7>m^2/s. The thermal diffusivity of ALH-77231 was measured for three mutually perpendicular directions. However, significant difference of thermal diffusivity between directions was not detected. We cannot find a correlation between the measured physical quantities and the petrologic types so far. Report Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research National Institute of Polar Research Repository, Japan Antarctic |
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National Institute of Polar Research Repository, Japan |
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ftnipr |
language |
English |
description |
The intrinsic and bulk densities, porosities and ultrasonic-wave velocities (V_p and V_s) in three mutually perpendicular directions were measured in five antarctic meteorites (ordinary chondrites; ALH-77288,-77294,-78103,-78251 and MET-78003). V_p and V_s measurements were made at the room temperature and under one atmospheric pressure. Measured V_p and V_s values are fairly smaller than those expected from their mineral compositions except for ALH-77288. High porosity values (∿10%) of the samples, except for that (∿2%) of ALH-77288,are consistent with such low elastic-wave velocities. Degree of decrease in velocity is, however, larger than that expected from spherical pores. Thus, V_p and V_s of chondrites may be controlled by the crack porosity. Very low transmitting efficiency of the shear-wave may also support this view. Velocity anisotropy between transmitting directions is observed in almost all samples. The thermal diffusivity of four antarctic meteorites (ordinary chondrites; ALH-769,-77231,Y-74191 and -74371) was measured under the vacuum condition (below (10)^<-3> mmHg) in the temperature range of 100 to 500K. Thermal diffusivities of chondrites are also smaller than those expected from their mineral compositions and are ascribed to their high porosity values. The thermal diffusivities at 300K are 2.7∿5.0×(10)^<-7>m^2/s. The thermal diffusivity of ALH-77231 was measured for three mutually perpendicular directions. However, significant difference of thermal diffusivity between directions was not detected. We cannot find a correlation between the measured physical quantities and the petrologic types so far. |
format |
Report |
author |
Kiyoshi Yomogida Takafumi Matsui |
spellingShingle |
Kiyoshi Yomogida Takafumi Matsui Physical properties of some Antarctic meteorites |
author_facet |
Kiyoshi Yomogida Takafumi Matsui |
author_sort |
Kiyoshi Yomogida |
title |
Physical properties of some Antarctic meteorites |
title_short |
Physical properties of some Antarctic meteorites |
title_full |
Physical properties of some Antarctic meteorites |
title_fullStr |
Physical properties of some Antarctic meteorites |
title_full_unstemmed |
Physical properties of some Antarctic meteorites |
title_sort |
physical properties of some antarctic meteorites |
publisher |
Geological Institute, Faculty of Science, University of Tokyo |
publishDate |
1981 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1230 http://id.nii.ac.jp/1291/00001230/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1230&item_no=1&attribute_id=18&file_no=1 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research |
genre_facet |
Antarc* Antarctic Memoirs of National Institute of Polar Research Polar Research |
op_relation |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1230 http://id.nii.ac.jp/1291/00001230/ AA00733561 Memoirs of National Institute of Polar Research. Special issue, 20, 384-394(1981-12) https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1230&item_no=1&attribute_id=18&file_no=1 |
_version_ |
1766248250806894592 |