The silicon isotope composition of three carbonaceous chon-drites (Orgueil, Murchison, and Vigarano), three ordinary chon-drites (Parnallee, Bovedy, Bremervörde), one enstatite chondrite (Sahara 97158) and nine terrestrial samples (7 peridotites, 1 mid-ocean ridge basalt, 1 ocean island basalt) were measured to high precision and accuracy using the high resolution Nu Plasma 1700 MC-ICPMS at ETH...

Cosmic dust grains sample a diverse range of solar system small bodies. This includes asteroids that are not otherwise represented in our meteorite collections. In this work we obtained 3D images micrometeorite interiors using tomography before collecting destructive high-precision oxygen isotope measurements. These data allow us to link textures unmelted micrometeorites known chondrite groups....

Introduction. In the 2003/04 season, the ANSMET team recovered 83 meteorites in an elliptical area of 1.6 x 0.2 km from a blue ice field near Otway Massif in the Grosvenor Mountains (Fig. 1). The size distribution of the meteorites within this area suggests they are a well preserved strewnfield, with the largest mass (29 kg) on the East end and the smallest masses (~100 g) on the West end [1]. ...

The Oort cloud is thought to be a reservoir of icy planetesimals and the source long-period comets (LPCs) implanted from outer Solar System during time giant-planet formation. abundance rocky ice-free bodies key diagnostic formation models as it can distinguish between ‘massive’ ‘depleted’ proto-asteroid-belt scenarios thus disentangle competing planet models. Here we report direct observation ...

Abstract We investigated the stable isotope fractionation of chromium (Cr) for a panorama chondrites, including EH and EL enstatite chondrites their chondrules different phases (by acid leaching). observed that have heterogeneous δ 53 Cr values (per mil deviation Cr/ 52 from NIST SRM 979 standard), which we suggest reflect physical conditions in chondrite accretion regions. Chondrules primitive...

ALTERATION IN CHONDRULES FROM ALLENDE CV3 CHONDRITE I. Jabeen, M. Kusakabe, T. Nakamura and K. Nagao, Institute for Study of the Earth’s Interior, Okayama University, Japan, University of Toyama, Japan, Department of Earth and Planetary Science, Kyushu University, Japan, Laboratory for Earthquake Chemistry, University of Tokyo, Japan email: [email protected]; [email protected]; to...

CHONDRITE PARENT BODIES. T. Kleine, A.N. Halliday, H. Palme, K. Mezger, and A. Markowski, Institut für Isotopengeologie und Mineralische Rohstoffe, ETH Zentrum, Sonneggstr. 5, 8092 Zürich, Switzerland ([email protected]), Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1, United Kingdom, Institut für Geologie und Mineralogie, Universität zu Köln, Zülpicherstr. 49b, 50674...