2003 Annual Meeting
Session ID : G5-05
Conference information
Host: The Japanese Association of Mineralogists, Petrologists and Economic Geologists
G5:
JALANASH UREILITE FROM MONGOLIA
Details
Host: The Japanese Association of Mineralogists, Petrologists and Economic Geologists
Jalanash(Nuzhgen in Mongolian name) meteorite is the sixth falls and collected in Mongolian People's Republic in recent year. Jalanash meteorite fell in Olgiy(49N, 90E) of the western Mongol at 14:00, August 15, 1990 and it was colleded by nomadism people at just after fall. It was belived one more meteors to fell at that time, and about 1kg of the fall in weight was only collected. Jalanash meteortie is showing coarse grain, massive and fragile, nevertheless it showes very fresh because it had been collected just after fall. Jalanash meteorite consists mainly of coarse grained olivine and pigeonite with interstellar carbon, so Jalanash meteorite is classified to typical ureilite. There is lot of fine Fe-Ni metals in grain boudaries. Mineral compositions are very homogeneous: olivine average Fo80.6 and, range Fo91.8-78.6. Pigeonite average En75.1Fs17.2Wo7.7 and range En75.8-74.3Fs17.9-16.6Wo8.3-7.1. Major chemical compositions are followings: SiO2 39%, TiO2 0.08%, Al2O3 0.9%, FeO 16.2%, MnO 0.5%, MgO 38.3%, CaO 0.82%, Na20 0.09%, Cr2O3 0.7% FeS 0.8%, Fe 2.1%, Ni 0.1% and Co<30ppm. Jalanash ureilite is quite differ from 12 Antarctic ureilites in it's texture, but it similar to those mineral compositions.
