|Žd'ár nad Sázavou|
|Basic information||Name: Žd'ár nad Sázavou|
This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes, confirmed fall
Year fell: 2014
Country: Czech Republic
Mass: 45 g
This is 1 of 585 approved meteorites classified as L3. [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Approved 24 May 2015|
Revised 25 May 2015: Revised class
Writeup from MB 104:
Žd’ár nad Sázavou 49°31.3’ N, 16°2.0’ E
Vysocina, Czech Republic
Confirmed fall: 9 Dec 2014
Classification: Ordinary chondrite (L3)
History: A -15 absolute magnitude bolide was observed by thousands of eyewitnesses over large part of central Europe and recorded photographically by 10 automated all-sky fireball observatories at 7 Czech stations of the European Fireball Network on Dec 9, 2014, at 16:16:45-54 UT. Very precise data on atmospheric trajectory, heliocentric orbit and fragmentation history were quickly determined. Based on this analysis it was evident that this event terminated with a multiple meteorite fall. The impact area for possible range of meteorite masses was thus modeled. Two small fresh meteorites which according to the prediction originated in the brightest flare at 36.4 km altitude (5.6 and 39.3 g) were found shortly after the bolide observations (20 Dec 2014 and 12 Jan 2015) during dedicated search. Both were recovered exactly in the predicted location for given mass (both less than 100 m apart the highest probability location).
Physical characteristics: As the meteorites fell in winter, the search was possible only in two short periods when snow was melted. Due to the low inclined trajectory (25 °) and high altitude fragmentation, the predicted impact area for 1 g to 1 kg meteorites is about 30 km long. The recovered meteorites with bulk density of 3.05 g/cm3 and high porosity of about 15% have black crust and are roundish in shape; the smaller one is partly broken, but the larger one is completely crusted.
Petrography: (J. Haloda, CzGS; P. Halodova, CzGS), The meteorite shows clearly visible and sharply defined chondrules and fine-grained matrix. Chondrule sizes vary from around 0.4 mm to 7 mm. Thin section shows recrystallization of a major part of the fine-grained matrix. Undulose extinction of olivine and orthopyroxene and the presence of irregular fractures indicate a very week shock stage.
Geochemistry: Mineral compositions and geochemistry: (J. Haloda, CzGS; P. Halodova, CzGS), Chondrules consist mostly of olivine (Fa20-27) mean Fa23.8, PMD-FeO 7.6%, n=52; low-Ca pyroxene (Fs15-23Wo0.7-1.6) mean Fs19.5 Wo1.33, Fs PMD 8.4%, Wo PMD 15.5%, n=53. Alkali-bearing glass exhibits a wide range of chemical compositions. Most secondary feldspar grains are <1 μm but some are larger; chromite, chlorapatite, troilite, kamacite and taenite are also present. The average Co amount in kamacite is 1.3 wt%, Co mean deviation 1.8%.
Classification: (J. Haloda, CzGS; P. Halodova, CzGS), Ordinary chondrite, L3, estimated subtype 3.9, Shock stage S2, weathering grade W0
Specimens: 5.92 g and 39.25 g at CzAS
CzAS: Astronomical Institute CAS, Fricova 298, 251 65 Ondrejov, Czech Republic, Czech Republic (institutional address; updated 1 Apr 2015)
CzGS: Czech Geological Survey, Klárov 3, 118 21 Praha 1, Czech Republic (institutional address; updated 27 Jun 2011)
|References:||Published in Meteoritical Bulletin, no. 104, in preparation (2015)|
This is 1 of 3 approved meteorites from Vysocina, Czech Republic
This is 1 of 25 approved meteorites from Czech Republic (plus 1 unapproved name)
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