^1,2Jisun Park et al. (>10)*
¹Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, New Jersey, USA
²Lunar and Planetary Institute, Houston, Texas, USA
*Find the extensive, full author and affiliation list on the publishers Website

The Hayabusa mission to asteroid 25143, Itokawa, brought back 2000 small particles, which most closely resemble material found in LL4-6 chondrites. We report an 40Ar/39Ar age of 1.3 ± 0.3 Ga for a sample of Itokawa consisting of three grains with a total mass of ~2 μg. This age is lower than the >4.0 Ga ages measured for 75% of LL chondrites but close to one for Y-790964 and its pairs. The flat 40Ar/39Ar release spectrum of the sample suggests complete degassing 1.3 Ga ago. Recent solar heating in Itokawa’s current orbit does not appear likely to have reset that age. Solar or impact heating 1.3 Ga ago could have done so. If impact heating was responsible, then the 1.3 Ga age sets an upper bound on the time at which the Itokawa rubble pile was assembled and suggests that rubble pile creation was an ongoing process in the inner solar system for at least the first 3 billion years of solar system history.

Reference
Park J et al. (2015) 40Ar/39Ar age of material returned from asteroid 25143 Itokawa. Meteoritics & Planetary Science (in Press)
Link to Article [DOI: 10.1111/maps.12564]
Published by arrangement with John Wiley & Sons

¹Díaz Michelena, M., ²Kilian, R.
¹Payloads and Space Sciences Department, INTA, Ctra. Torrejón – Ajalvir km 4, Torrejón de Ardoz, Spain
²Geology Department, University of Trier, Behringstrasse, Trier, Germany

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Reference
Díaz Michelena M, Kilian R (2015) Magnetic signatures of the orogenic crust of the Patagonian Andes with implication for planetary Exploration. Physics of the Earth and Planetary Interiors 248, 35-54
Link to Article [DOI: 10.1016/j.pepi.2015.08.005]

¹Erokhin, Y.V., ¹Koroteev, V.A., ¹Khiller, V.V., ²Burlakov, E.V., ¹Ivanov, K.S., ²Kleimenov, D.A.
¹Zavaritskii Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russian Federation
²Ural State Mining University, Yekaterinburg, Russian Federation

We currently do not have a copyright agreement with this publisher and cannot display the abstract here

Reference
Erokhin YV, Koroteev VA, Khiller VV, Burlakov EV, Ivanov KS, Kleimenov DA (2015) The Kunashak meteorite: New data on mineralogy. Doklady Earth Sciences 464, 1058-1061
Link to Article [DOI: 10.1134/S1028334X15100128]