Antarctic scientists discover 18-kilogram meteorite

Feb. 28, 2013 ? An international team of scientists, working at Princess Elisabeth Antarctica research station, have discovered a meteorite with a mass of 18 kilograms 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 Universit? 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 Universit? Libre de Bruxelles, who led the Belgian part of the 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 contributes to 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.

"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 S?r Rondane Mountains, Princess Elisabeth Antarctica welcomes scientists from around the world to conduct research in this little-studied and pristine environment.

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The above story is reprinted from materials provided by International Polar Foundation.

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Source: http://www.sciencedaily.com/releases/2013/02/130228113401.htm

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