Rare earth element abundances in the CK chondrites including the Kobe meteorite.

Siderophile-element anomalies in CK carbonaceous chondrites: Implications for parent-body aqueous alteration and terrestrial weathering of sulfides

“…These fractionations were accompanied by increases in Ca, Ba and As, a slight increase in Sb, and significant depletions in Ni, Co, Au and Se; the siderophile data indicate that Watson 002 is a member of the sL subgroup. Hirota et al (2002) focused on REE distributions and reported resolvable negative Eu-anomalies for most of the samples, but a positive anomaly for Maralinga. In our data set, no negative Eu anomalies were resolvable for any of the samples.…”

“…See text for details on subgroups 'normal', sH (siderophile high), sM (siderophile medium), sL (siderophile low). Data on Karoonda from Kallemeyn et al (1991); data on Kobe from Hirota et al (2002) and Oura et al (2002). 200-lm-sized grains. Following the criteria of Kallemeyn et al (1991), we reclassify this meteorite as CK5.…”

“…Abundances are also normalized to mean CK chondrites. All samples were analyzed at UCLA with the exception of Kobe, for which we used the published data of Hirota et al (2002) and Oura et al (2002).…”

Special Issue: The Kobe meteorite consortium—Preface

“…These three key elements, S, Al and Mn, were determined for voluminous and irregularly shaped samples by PGA, demonstrating the utility of PGA in the analysis of newly fallen meteorites such as the Kobe chondrite. Hirota et al (2002) report the high-precision isotope dilution analysis of 17 lithophiles including REEs, 2 alkalis, 4 alkaline earths and Fe for 10 bulk CK chondrites including the Kobe meteorite. The Kobe and CK chondrites are characterized with respect to REE pattern.…”

“…Results of noble gas analyses and petrological examinations of the meteorite were reported by Matsumoto et al (2001) and Tomeoka et al (2001), respectively. The 7 papers included in this special issue for the Kobe meteorite include reports on chemical compositions by Oura et al (2002) and Hirota et al (2002), petrology and mineralogy by Tachibana et al (2002), gammaray measurements for cosmic-ray induced radionuclides by Komura et al (2002), noble gas analyses by Matsumoto et al (2002) and Takaoka et al (2002), and X-ray computed tomography (CT) results for discussion of the nondestructive digital curation of meteorite samples by Tsuchiyama et al (2002). Oura et al (2002) employed neutron-induced prompt gamma-ray analysis (PGA) to analyze several lumps of sample of the Kobe meteorite, as well as a powdered sample and separated chondrules.…”