Search for Antarctic meteorites in the bare ice field around the Yamato Mountains by JARE-41
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概要
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The wintering party (November 14,1999-March 28,2001) of the 41st Japanese Antarctic Research Expedition (JARE-41) conducted a meteorite search in the bare ice field around the Yamato Mountains. The period of the travel was 89 days. Departure from Syowa Station was on October 27,2000,entrance into the bare ice field on November 17,2000,leaving the bare ice field on January 10,2001,and arrival at Syowa Station on January 23,2001. The 6 men party (field leader : Y. Shimoda, and sub-leader : N. Imae) of JARE-41 collected about 3500 meteorites. The total sample weight was about 196kg. The average meteorite weight was 55g. The most frequent weight was in the bin of 3.2-10g of the weight histogram. The heaviest meteorite collected on the present expedition was an iron meteorite of 50.5kg. This is also the heaviest meteorite among the Yamato bare ice region since the first expedition in 1969 (JARE-10). The iron meteorite was found on the northwest region of JARE IV Nunataks. Compared with other areas, relatively large meteorites were found here. The number of meteorites on the bare ice region around Minami-Yamato Nunataks, which is the most famous meteorite concentration area, was large but the weight of each meteorite was lighter compared with other areas. Sublimation rate, which must be one of the most important factors for the concentration of meteorites, was measured at the near YM175 (71°44.4′S, 35°54.7′E, 2138m) using two independent methods. Both the stake method and the empirical formula method gave nearly comparable values in average; 50-80 and 130.8mg cm^<-2>d^<-1>, respectively, which are larger than that at Mizuho Station. Sublimation using the stake method was measured at 8 points. Precise GPS measurements for 20 days at YM175 showed that the bare ice is moving 3cm to the west and 2cm upward. This suggests that the upward movement is nearly balanced with the sublimation of ice. However, in order to consider the annual balance, longer measurements are needed.
- 国立極地研究所の論文
著者
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岩田 尚能
山形大学理学部地球環境学科
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岩田 尚能
東大・地震研
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Imae Naoya
Antarctic Meteorites Research Center National Institute Of Polar Research
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Imae Naoya
Antarctic Meteorite Research Center National Institute Of Polar Research
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Iwata Naoyoshi
Faculty of Sciences, Yamagata University
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岩田 尚能
山形大
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岩田 尚能
山形大・理
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岩田 尚能
Earthquake Research Institute University Of Tokyo
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Iwata Naoyoshi
Earthquake Research Institute University Of Tokyo
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Iwata Naoyoshi
Department Of Earth And Environmental Sciences Faculty Of Science Yamagata University
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Iwata Naoyoshi
Faculty Of Sciences Yamagata University
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Shimoda Yasuyoshi
Mizuho Junior High School
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