Graphite in ureilites, enstatite chondrites, and unique clasts in ordinary chondrites – Insights from the carbon-isotope composition

Be-B IN ENSTATITE AND ORDINARY CHONDRITES: A PRELIMINARY STUDY

The oxygen isotope composition of dark inclusions in HEDs, ordinary and carbonaceous chondrites

Introduction: Dark inclusions (DIs) are lithic fragments that form a volumetrically small, but important, component in carbonaceous chondrites [1,2]. Carbonaceous clasts similar to DIs are also found in some ordinary chondrites and HEDs [3,4]. DIs are of particular interest because they provide a record of nebular and planetary processes distinct from that of their host meteorite [1,5]. DIs may...

Silver Isotope Fractionation in Chondrites

I n t r o d u c t i o n : The study of Ag isotopic compositions is of particular interest because of the extinct radionuclide Pd, which decays to Ag with a half-life of 6.5 Myrs. This chronometer has been successfully applied to unravel formation and differentiation processes of iron meteorites [1-3]. Compared to the early measurements by TIMS, the use of multi-collector inductively coupled pla...

Presolar Grains from Primitive Ordinary Chondrites

Kobayashi, K. Nagashima, N. Sakamoto, S. S. Russell, S. Itoh and H. Yurimoto. Division of Earth and Planetary Sciences, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan ([email protected]); Hawai’i Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawai’i at Manoa, Honolulu, HI 96822, USA; Department of Mineralogy, The Natura...

Investigation of Presolar Silicate Grains from Enstatite Chondrites