The global accretion rate of extraterrestrial materials in the last glacial period estimated from the abundance of micrometeorites in Antarctic glacier ice
The accretion rate of micrometeorites in the last glacial period was estimated from the concentrations of micrometeorites in the blue ice around the Yamato Mts. in Antarctica. The samples from this study were collected from the five sampling points (M03, K02, K11, J09 and J10) in the blue ice. The b...
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| Veröffentlicht in: | Earth, planets, and space planets, and space, 2004-01, Vol.56 (1), p.67-79 |
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| creator | YADA, Toru NAKAMURA, Tomoki TAKAOKA, Nobuo NOGUCHI, Takaaki TERADA, Kentaro YANO, Hajime NAKAZAWA, Takakiyo KOJIMA, Hideyasu |
| description | The accretion rate of micrometeorites in the last glacial period was estimated from the concentrations of micrometeorites in the blue ice around the Yamato Mts. in Antarctica. The samples from this study were collected from the five sampling points (M03, K02, K11, J09 and J10) in the blue ice. The blue ice was melted and filtered, and the micrometeorites were handpicked from the collected "glacial sands". The weight of the micrometeorites in the blue ice was estimated from the abundance of recovered micrometeorites and the solar noble gas concentrations in the "residue" after handpicking. The age of the blue ice from the K area was estimated to be 27-33 kyr before present based on oxygen isotope data. The estimated accretion rate to the whole Earth ranges from 5300 x 103kg/a to 16000 x 103kg/a. However, the lower end of this range probably represents lower limits due to possible loss of solar noble gases during long residence in the glacier ice. Hence, we estimate that the accretion rate of micrometeorites 27-33 kyr before present to be in the range between (11000 plus/minus 6600) x 103kg/a and (16000 - 9100) x 103kg/a. These results, as well as the other estimates, suggest that the accretion rate of micrometeorites in the last glacial period was comparable to that in the present. |
| doi_str_mv | 10.1186/BF03352491 |
| format | Article |
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The samples from this study were collected from the five sampling points (M03, K02, K11, J09 and J10) in the blue ice. The blue ice was melted and filtered, and the micrometeorites were handpicked from the collected "glacial sands". The weight of the micrometeorites in the blue ice was estimated from the abundance of recovered micrometeorites and the solar noble gas concentrations in the "residue" after handpicking. The age of the blue ice from the K area was estimated to be 27-33 kyr before present based on oxygen isotope data. The estimated accretion rate to the whole Earth ranges from 5300 x 103kg/a to 16000 x 103kg/a. However, the lower end of this range probably represents lower limits due to possible loss of solar noble gases during long residence in the glacier ice. Hence, we estimate that the accretion rate of micrometeorites 27-33 kyr before present to be in the range between (11000 plus/minus 6600) x 103kg/a and (16000 - 9100) x 103kg/a. These results, as well as the other estimates, suggest that the accretion rate of micrometeorites in the last glacial period was comparable to that in the present.</description><identifier>ISSN: 1343-8832</identifier><identifier>ISSN: 1880-5981</identifier><identifier>EISSN: 1880-5981</identifier><identifier>DOI: 10.1186/BF03352491</identifier><language>eng</language><publisher>Tokyo: Terra</publisher><subject>Cosmochemistry. 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The samples from this study were collected from the five sampling points (M03, K02, K11, J09 and J10) in the blue ice. The blue ice was melted and filtered, and the micrometeorites were handpicked from the collected "glacial sands". The weight of the micrometeorites in the blue ice was estimated from the abundance of recovered micrometeorites and the solar noble gas concentrations in the "residue" after handpicking. The age of the blue ice from the K area was estimated to be 27-33 kyr before present based on oxygen isotope data. The estimated accretion rate to the whole Earth ranges from 5300 x 103kg/a to 16000 x 103kg/a. However, the lower end of this range probably represents lower limits due to possible loss of solar noble gases during long residence in the glacier ice. Hence, we estimate that the accretion rate of micrometeorites 27-33 kyr before present to be in the range between (11000 plus/minus 6600) x 103kg/a and (16000 - 9100) x 103kg/a. These results, as well as the other estimates, suggest that the accretion rate of micrometeorites in the last glacial period was comparable to that in the present.</description><subject>Cosmochemistry. 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The samples from this study were collected from the five sampling points (M03, K02, K11, J09 and J10) in the blue ice. The blue ice was melted and filtered, and the micrometeorites were handpicked from the collected "glacial sands". The weight of the micrometeorites in the blue ice was estimated from the abundance of recovered micrometeorites and the solar noble gas concentrations in the "residue" after handpicking. The age of the blue ice from the K area was estimated to be 27-33 kyr before present based on oxygen isotope data. The estimated accretion rate to the whole Earth ranges from 5300 x 103kg/a to 16000 x 103kg/a. However, the lower end of this range probably represents lower limits due to possible loss of solar noble gases during long residence in the glacier ice. Hence, we estimate that the accretion rate of micrometeorites 27-33 kyr before present to be in the range between (11000 plus/minus 6600) x 103kg/a and (16000 - 9100) x 103kg/a. 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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Springer Nature OA Free Journals; Springer Nature - Complete Springer Journals; J-STAGE (Japan Science & Technology Information Aggregator, Electronic) Freely Available Titles - Japanese; Alma/SFX Local Collection |
| subjects | Cosmochemistry. Extraterrestrial geology Earth sciences Earth, ocean, space Exact sciences and technology |
| title | The global accretion rate of extraterrestrial materials in the last glacial period estimated from the abundance of micrometeorites in Antarctic glacier ice |
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