Isotopic ratios, concentration of noble gases and mineral and bulk composition of extraterrestrial dust particles in Dome Fuji ice core, East Antarctica ...

• Main Authors: Misawa, Keji, Kohno, Mika, Tomiyama, Takayuki, Noguchi, Takaaki, Nakamura, Tomoki, Nagao, Keisuke, Mikouchi, Takashi, Nishiizumi, Kunihiko
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2010
• Subjects: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarc*; Antarctic; Antarctica; East Antarctica; EPICA; ice core; Ice Sheet; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.848893; https://doi.pangaea.de/10.1594/PANGAEA.848893

Two silicate-rich dust layers were found in the Dome Fuji ice core in East Antarctica, at Marine Isotope Stages 12 and 13. Morphologies, textures, and chemical compositions of constituent particles reveal that they are high-temperature melting products and are of extraterrestrial origin. Because similar layers were found ~2000 km east of Dome Fuji, at EPICA (European Project for Ice Coring in Antarctica)-Dome C, particles must have rained down over a wide area 434 and 481 ka. The strewn fields occurred over an area of at least 3 × 10**6 km**2. Chemical compositions of constituent phases and oxygen isotopic composition of olivines suggest that the upper dust layer was produced by a high-temperature interaction between silicate-rich melt and water vapor due to an impact explosion or an aerial burst of a chondritic meteoroid on the inland East Antarctic ice sheet. An estimated total mass of the impactor, on the basis of particle flux and distribution area, is at least 3 × 10**9 kg. A possible parent material of ... : Supplement to: Misawa, Keji; Kohno, Mika; Tomiyama, Takayuki; Noguchi, Takaaki; Nakamura, Tomoki; Nagao, Keisuke; Mikouchi, Takashi; Nishiizumi, Kunihiko (2010): Two extraterrestrial dust horizons found in the Dome Fuji ice core, East Antarctica. Earth and Planetary Science Letters, 289(1-2), 287-297 ...