available online at http://meteoritics.org 1521 © Meteoritical Society, 2003. Printed in USA. Impact-induced frictional melting in ordinary chondrites: A mechanism for deformation, darkening, and vein formation C. H. VAN DER BOGERT,1* P. H. SCHULTZ,1 and J. G. SPRAY2 1Department of Geological Sciences, Brown University, Providence, Rhode Island 02912, USA 2Planetary and Space Science Centre, De...

Bjurböle L/LL4 ordinary chondrite was studied using scanning electron microscopy with energy dispersive spectroscopy, Raman X-ray diffraction, magnetization measurements and Mössbauer spectroscopy. The phase composition the relative iron fractions in iron-bearing phases were determined. unit cell parameters for olivine, orthopyroxene clinopyroxene are similar to those observed other chondrites....

Small variations for Mo isotopes have been observed recently in the Allende meteorite and in iron meteorites, mesosiderites, and pallasites, using ICP-MS [1]. Large effects for Mo have been reported for leaches of Orgueil [2] and in SiC and graphite from Murchison [3-5]. Variations for Mo in bulk Allende and in Murchison have also been presented by NTIMS [6]. Effects in Ru isotopes can define f...

Introduction: Presolar grains have been identified in primitive members of all chondrite classes [1,2]. The isotopic compositions of presolar grains provide probes of galactic evolution and nucleosynthesis in stars [3,4], while the abundances and characteristics of presolar grains contain a record of thermal processing in the solar system [2,5]. Most of the detailed isotopic work has been done ...

We conducted experiments in space to investigate the aggregation of millimeterand submillimeter-sized particles in microgravity, an important early step in planet formation. Particulate materials included salt (NaCl), sugar (sucrose), coffee, mica, ice, Bjurb€ ole chondrules, ordinary and carbonaceous chondrite meteorite fragments, and acrylic and glass beads, all triply confined in clear plast...

The Open University's repository of research publications and other research outputs Insight into the evolution of the Tagish Lake carbonaceous chondrite by analysis of the oxygen isotopic composition of extracted water and Mssbauer spectroscopy Conference Item (2001). Insight into the evolution of the Tagish Lake carbonaceous chondrite by analysis of the oxygen isotopic composition of extracte...

Niobium-92 (92Nb) decays to zirconium-92 (92Zr) with a half-life of 36 million years and can be used to place constraints on the site of p-process nucleosynthesis and the timing of early solar system processes. Recent results have suggested that the initial 92Nb/93Nb of the solar system was high (>10(-3)). We report Nb-Zr internal isochrons for the ordinary chondrite Estacado (H6) and a clast o...