Element distributions in metallic fractions of ordinary chondrites

Details Element distributions in metallic fractions of ordinary chondrites Element distributions in metallic fractions of ordinary chondrites

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.484k&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 484-485

Computer Science

Chemical Composition, Chondrites, Metals, Meteoritic Composition, Kamacite, Mossbauer Effect, Neutron Activation Analysis

Scientific paper

Kamacite and taenite are the major metallic phases in ordinary chondrite, in individual grains of pure alloy. Wood interpreted the concentration gradients of Ni found in two metal phases as a result of exsolution of kamacite from taenite followed by sluggish diffusion of Ni into the taenite crystals upon cooling through approximately 500 C. A selective chemical dissolution method was developed to separated taenite from kamacite and this method was applied to several ordinary chondrites. Based on Instrumental Neutron Activation Analysis (INAA) data and Mossbauer spectra for the metal separates, we evaluated the distribution of various elements between taenite and kamacite. The magnetic fraction separated from ALH 77231 (L6) was boiled in HF for 2 min and named M-1. The M-1 fraction was further treated for 5, 10, and 15 min and the remaining fractions were designed as M-2, M-3, and M-4 respectively. Mossbauer spectrum showed that M-1 was composed almost of alpha-phase kamacite. Mossbauer spectra of the M-2, M-3, and M-4 showed each having similar intensities of kamacite, taenite, and tetrataenite. On the basis of different leaching rate with concentrated HF acid between kamacite and taenite, we can determine element distributions in these different fractions. INAA analyses show that the M-1 is composed of 10% Ni. Contents of Ni in the M-2, M-3, and M-4 show that these three metal fractions are mainly composed of Ni-rich metals with a mean value of 36% Ni. Based on different proportions of kamacite and taenite in these metal fractions, we calculated siderophile-element contents in taenite and kamacite.

Affiliated with

Also associated with

No associations

Rating

Element distributions in metallic fractions of ordinary chondrites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Element distributions in metallic fractions of ordinary chondrites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Element distributions in metallic fractions of ordinary chondrites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-822332