Introduction: The recovery of meteorites from the impact of asteroid 2008 TC3 in the Nubian Desert of Sudan on October 7, 2008, marked the first time meteorites were collected from an asteroid observed in space by astronomical techniques before impacting [1,2]. Search teams from the University of Khartoum traced the lo-cation of the strewn field and collected about 660 meteorites in four expeditions to the fall region, all of which have known fall coordi-antes. Upon further study, the Almahata Sitta meteorites proved to be a mixed bag [3] of mostly ureilites (course grained, fine grained, and sulfide-metal assemblages), enstatite chon-drites (EL3-6, EH3, EH5, breccias) and ordi-nary chondrites (H5-6, L4-5). One bencub-binite-like carbonaceous chondrite was identi-fied, as well as one unique Rumuruti-like chon-drite and an Enstatite achondrite [4-6]. New analysis: The analysed meteorites so far suggest a high 30-40% fraction of non-ureilites among the recovered samples [4,6], but that high fraction does not appear to be in agreement with the meteorites in the University of Khar-toum (UoK) collection. Ureilites dominate the meteorites that were recovered by the Sudanese teams. To better understand the fraction of recov-ered materials that fell to Earth, a program has been initiated to type the meteorites in the UoK collection in defined search areas. At this meet-ing, we will present some preliminary results from that investigation. Acknowledgments: This work is supported by the University of Khartoum and the NASA EW program. References: [1] Jenniskens et al. (2009) Nature, 458, 485. [2] Goodrich C. A., et al. (2014) ELements, 10, 31. [3] Zolensky M. E. et al. (2010) MAPS, 45, 1618. [4] Horstmann M. and Bischoff A. (2014) Che-mie der Erde, 74/2, 149. [5] Bisschoff A., Ebert S., Patzek M., Horst-mann M., Pack A., Decker S. (2016) Met. Soc. Conf., abstract 6319. [6] Hoffmann V. H., Kaliwoda M., Hochleitner R., Funaki M., Decker S. (2016) Met. Soc. Conf., abstract 1874.
ASTEROID 2008 TC3 BREAKUP AND METEORITE FRACTIONS
A M Fioretti
2017
Abstract
Introduction: The recovery of meteorites from the impact of asteroid 2008 TC3 in the Nubian Desert of Sudan on October 7, 2008, marked the first time meteorites were collected from an asteroid observed in space by astronomical techniques before impacting [1,2]. Search teams from the University of Khartoum traced the lo-cation of the strewn field and collected about 660 meteorites in four expeditions to the fall region, all of which have known fall coordi-antes. Upon further study, the Almahata Sitta meteorites proved to be a mixed bag [3] of mostly ureilites (course grained, fine grained, and sulfide-metal assemblages), enstatite chon-drites (EL3-6, EH3, EH5, breccias) and ordi-nary chondrites (H5-6, L4-5). One bencub-binite-like carbonaceous chondrite was identi-fied, as well as one unique Rumuruti-like chon-drite and an Enstatite achondrite [4-6]. New analysis: The analysed meteorites so far suggest a high 30-40% fraction of non-ureilites among the recovered samples [4,6], but that high fraction does not appear to be in agreement with the meteorites in the University of Khar-toum (UoK) collection. Ureilites dominate the meteorites that were recovered by the Sudanese teams. To better understand the fraction of recov-ered materials that fell to Earth, a program has been initiated to type the meteorites in the UoK collection in defined search areas. At this meet-ing, we will present some preliminary results from that investigation. Acknowledgments: This work is supported by the University of Khartoum and the NASA EW program. References: [1] Jenniskens et al. (2009) Nature, 458, 485. [2] Goodrich C. A., et al. (2014) ELements, 10, 31. [3] Zolensky M. E. et al. (2010) MAPS, 45, 1618. [4] Horstmann M. and Bischoff A. (2014) Che-mie der Erde, 74/2, 149. [5] Bisschoff A., Ebert S., Patzek M., Horst-mann M., Pack A., Decker S. (2016) Met. Soc. Conf., abstract 6319. [6] Hoffmann V. H., Kaliwoda M., Hochleitner R., Funaki M., Decker S. (2016) Met. Soc. Conf., abstract 1874.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
