Mineralogy, reflectance spectra, and physical properties of the Chelyabinsk LL5 chondrite – Insight into shock-induced changes in asteroid regoliths

Kohout, T.; Gritsevich, Maria; Grokhovsky, V. I.; Yakovlev, G. A.; Haloda, J.; Halodová, Patricie; Michallik, Radoslaw M.; Penttilä, Antti; Muinonen, K.

doi:10.1016/j.icarus.2013.09.027

Cited by 85 publications

(117 citation statements)

References 14 publications

(18 reference statements)

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“…The meteorites were classified as LL type ordinary chondrite breccia (Kohout et al 2014). LL is a common type of meteorite (represents 9% of all falls).…”

Section: The Resultsmentioning

confidence: 99%

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The Chelyabinsk event

Borovička

2015

Proc. IAU

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Abstract. On February 15, 2013, 3:20 UT, an asteroid of the size of about 19 meters and mass of 12,000 metric tons entered the Earth's atmosphere unexpectedly near the border of Kazakhstan and Russia. It was the largest confirmed Earth impactor since the Tunguska event in 1908. The body moved approximately westwards with a speed of 19 km s −1 , on a trajectory inclined 18 degrees to the surface, creating a fireball of steadily increasing brightness. Eleven seconds after the first sightings, the fireball reached its maximum brightness. At that point, it was located less than 40 km south from Chelyabinsk, a Russian city of population more than one million, at an altitude of 30 km. For people directly underneath, the fireball was 30 times brighter than the Sun. The cosmic body disrupted into fragments; the largest of them was visible for another five seconds before it disappeared at an altitude of 12.5 km, when it was decelerated to 3 km s −1 . Fifty six second later, that ∼ 600 kg fragment landed in Lake Chebarkul and created a 8 m wide hole in the ice. Small meteorites landed in an area 80 km long and several km wide and caused no damage. The meteorites were classified as LL ordinary chondrites and were interesting by the presence of two phases, light and dark. More material remained, however, in the atmosphere forming a dust trail up to 2 km wide and extending along the fireball trajectory from altitude 18 to 70 km. The dust then circled the Earth within few days and formed a ring around the northern hemisphere. In Chelyabinsk and its surroundings a very strong blast wave arrived 90 -150 s after the fireball passage (depending on location). The wave was produced by the supersonic flight of the body and broke ∼ 10% of windows in Chelyabinsk (∼ 40% of buildings were affected). More than 1600 people were injured, mostly from broken glass. The whole event was well documented by video cameras, seismic and infrasonic records, and satellite observations. The total energy was 500 kT TNT (2 × 10 15 J).

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“…The meteorites were classified as LL type ordinary chondrite breccia (Kohout et al 2014). LL is a common type of meteorite (represents 9% of all falls).…”

Section: The Resultsmentioning

confidence: 99%

“…All three phases have identical composition. The dark lithology was produced by shock-darkening (Kohout et al 2014;Reddy et al 2014;Richter et al 2015). Its reflectance spectrum can mimic carbonaceous material.…”

Section: The Resultsmentioning

confidence: 99%

The Chelyabinsk event

Borovička

2015

Proc. IAU

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“…; Kohout et al. ). In detail, the more recently fallen Misfits Flat 002 is similar to Chelyabinsk in terms of its petrographic properties (Table ).…”

Section: Discussionmentioning

confidence: 99%

Meteorites found on Misfits Flat dry lake, Nevada

Harlan¹,

Jenniskens

Zolensky

et al. 2016

Meteorit & Planetary Scien

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Abstract-Meteorites have been found on the small Misfits Flat dry lakebed near Stagecoach, Nevada (119.382W, +39.348N). Since the first find on Sept. 22, 2013, a total of 58 stones of weathering stage W2/3 with a combined mass of 339 g have been collected in 19 visits to the area. This small (3.3 9 3.6 km) lakebed is now a newly designated dense collection area (DCA). Most meteorites were found in a small 350 9 180 m area along the north shore and most are fragments of several broken individual stones. Three of these fragments were classified as an LL4/5 of shock stage S2, now named Misfits Flat 001, one of which (stone MF33) fell 8.1 AE 1.3 ka ago based on the 14 C terrestrial age, assuming it came from a 20-80 cm diameter meteoroid. In addition, a small darkly crusted meteorite MF34, now named Misfits Flat 002, was found 820 m WSW from the main mass. This meteorite is classified as an LL5 ordinary chondrite with shock stage S4/5. The meteorite is saturated in 14 C at 63 dpm kg À1 , suggesting it originated from the center of a 0.5 m diameter meteoroid, or deep inside a~1.0 m meteoroid, less than 300 yr ago. Accounts exist of a fireball seen at 13:15 UT on March 2, 1895, that are consistent with the find location of Misfits Flat 002.

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“…; Kohout et al. ; Ozawa et al. ) that could be produced in the Sun atmosphere (a temperature of the shock‐melt vein matrix formation is estimated over 1700–2000 °C in (Ozawa et al.…”

Section: Long‐term Evolutionmentioning

confidence: 99%