Japan Geoscience Union Meeting 2018

Presentation information

[EJ] Oral

P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS06] Formation and evolution of planetary materials in the Solar System

Wed. May 23, 2018 3:30 PM - 5:00 PM A01 (Tokyo Bay Makuhari Hall)

convener:Akira Yamaguchi(National Institute of Polar Research), Wataru Fujiya(Ibaraki University, College of Science), Yoko Kebukawa(横浜国立大学 大学院工学研究院, 共同), Masahiro KAYAMA(Department of Earth and Planetary Material Sciences, Faculty of Science, Tohoku University), Chairperson:Fujiya Wataru

4:15 PM - 4:30 PM

[PPS06-04] Refractory Siderophile Elements Depleted in AOA Metal

*Naoya Sakamoto1, Yoshiki Makino2, Noriyuki Kawasaki3 (1.Hokkaido University, 2.Tokyo University, 3.JAXA)

Keywords:Amoeboid olivine aggregates, Refractory siderophile elements, LA-ICP-MS, SIMS

Oxygen isotopes of 16O-rich composition are observed in calcium-aluminum-rich inclusions (CAI) and amoeboid olivine aggregates (AOA). Opaque assemblages in CAI[1,2] show enrichment of refractory siderophile elements relative to the metals in CH[3,4] and CB[5,6] chondrites measured by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). In this study, refractory siderophile elements of AOA metal were measured in Acfer 094 carbonaceous chondrites.

The siderophile elements Cr, Mn, Fe, Co, Ni, Cu, Ga, Ge, Pd, W, Re, Os, Ir, Pt in AOA metals and chondrule metals from a polished thin section of Acfer 094 were measured by LA-ICP-MS at Tokyo University. The oxygen isotopes of forsterites in AOA were measured by SIMS at Hokkaido University.

The refractory siderophile elements were depleted in the AOA metal more than two orders of magnitude lower than the metal in chondrules. The complementarity of the refractory siderophile elements between CAI and AOA metal indicates the formation from the same district for both 16O-rich materials.

[1] Campbell A. J. et al. (1999) LPS XXX #1609. [2] Campbell et al. (2003) GCA 67, 3119-3134. [3] Campbell et al. (2001) GCA 65, 163-180. [4] Campbell and Humayun M. (2004) GCA 68, 3409-3422. [5] Campbell et al. (2002) GCA 66, 647-660. [6] Campbell et al. (2005) Meteoritics & Planet. Sci. 40, 1131-1148.