by Staff Writers
Princess Elisabeth Antarctica (SPX) Mar 06, 2013
A team of scientists working at Princess Elisabeth Antarctica have recently discovered a meteorite weighing 18kg embedded in the East Antarctic ice sheet, the largest such meteorite found in the region since 1988.
The eight members of the SAMBA project, from Universite Libre de Bruxelles (ULB) and Vrije Universiteit Brussel (VUB), Japan's National Institute of Polar Research (NIPR) and Tokyo University were searching for meteorites scattered across the Nansen Ice Field on January 28, when they found the 18kg ordinary chondrite. The team discovered a total of 425 meteorites, with a total weight of 75kg during the 40 day expedition, at an altitude of 2,900m, 140km south of Belgium's Princess Elisabeth Antarctica research base.
"This meteorite was a very unexpected find for us, not only due to its weight, but because we don't normally find such large meteorites in Antarctica", said Vinciane Debaille, a geologist from Universite Libre de Bruxelles, who led the Belgian team during the expedition "This is the biggest meteorite found in East Antarctica for 25 years, so it's a very special discovery for us, only made possible by the existence and location of Princess Elisabeth Antarctica."
The SAMBA project contributesto the US and Japan-led global collection of Antarctic meteorites, and is an initiative of VUB and ULB, in collaboration with the Japanese Institute of Polar Research. SAMBA is supported by the Belgian Science Policy (BELSPO) and the International Polar Foundation.
Initial field analysis by the scientists suggests that the 18kg meteorite is an ordinary chondrite, the most abundant kind of meteorite. The fusion crust - the meteorite's outer casing - was eroded, allowing the scientists to inspect the rock underneath. The meteorite is currently undergoing a special thawing process in Japan - to ensure water doesn't get inside the rock - but will be brought to Belgium in the future.
"We study meteorites in order to better understand how the solar system formed, how it evolved, how the Earth became such a unique planet in our solar system", said Debaille. "This season's SAMBA mission was a success both in terms of the number and weight of the meteorites we found. Two years ago, we found less than 10kg. This year, we found so much that we had to call the travel agency - because we had 75kg of meteorites to take home".
Princess Elisabeth Antarctica is the world's first zero emission polar research station, and is operated by the International Polar Foundation, in partnership with the Belgian Polar Secretariat. Princess Elisabeth Antarctica's design and construction seamlessly integrates passive building technologies, renewable wind and solar energy, water treatment facilities, continuously monitored power demand and a smart grid for maximising energy efficiency. Located in East Antarctica's Sor Rondane Mountains, Princess Elisabeth Antarctica welcomes scientists from around the world to conduct research in this little-studied and pristine environment.
"Both Princess Elisabeth Antarctica and the International Polar Foundation are proud to support the research work of the Belgian and Japanese meteorite team", said expedition leader Alain Hubert. "By providing solid logistics and field accomodation solutions to scientists working on the ice, we can ensure they can concentrate on what they have come to Antarctica to achieve: unlocking of Nature's mysteries and broadening understanding of our planet".
To find out more about science at Princess Elisabeth Antarctica and life in the frozen south, visit Inside the Station http://www.insidethestation.be> - an interactive exhibition that takes visitors on a journey inside Belgium's zero emission polar research centre - currently taking place at Tour and Taxis, Brussels. Belgian and Japanese team:
+ Vinciane Debaille (Belgium, ULB)
+ Wendy Debouge (Belgium,ULB)
+ GeneviA"ve Hublet (Belgium, ULB)
+ Nadia Van Roosbroek (Belgium,VUB)
+ Harry Zekollari (Belgium,VUB)
+ Naoya Imae (Japan, NIPR)
+ Akira Yamaguchi (Japan, NIPR)
+ Takashi Mikouchi (Japan, University of Tokyo)
+ Yukihisa Akada (Japan, Field Guide)
+ Christophe Berclaz (Switzerland, Field Guide)
The four Japanese members are also part of the 54th Japanese Antarctic Research Expedition (JARE-54), while the other members are part of the 2012-2013 BELARE Belgian programme.
+ Total known meteorites discovered 56,555
+ Total meteorites found in Antarctica only: 38,537
+ Among Antarctic meteorites, only 30 have a mass greater than 18 kg. The 18kg meteorite has the fifth largest mass ever discovered in East Antarctica (Dronning Maud Land), and is the first of this size found in the area since 1988.
+ Per year, around 1,000 meteorites weighing less than 100g are found, and about 100 less than 1kg.
Source: The Meteoritical Society
The team found:
+ 425 meteorites
+ Total weight: 75kg
+ 1 meteorite at 18kg
+ 1 meteorite at 6kg
+ 1 meteorite at 4.5kg
+ 2 at 2kg
+ 4 at 1kg
International Polar Expedition
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