Mathematics – Logic
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993lpi....24..549g&link_type=abstract
In Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M p 549-550 (SEE N94-16173 03-91)
Mathematics
Logic
Chondrites, Inclusions, Magnesium Isotopes, Meteoritic Composition, Mineralogy, Petrography, Akermanite, Feldspars, Garnets, Ion Probes, Olivine, Pyroxenes, Spinel
Scientific paper
Three CAI's from the Grosnaja CV3 chondrite were analyzed for their magnesium isotopic compositions by the ion microprobe. The selected CAI's represent three distinct types: GR4(compact Type A), GR7(Type B) and GR2(Type C). Petrographic studies indicate that all three Grosnaja inclusions were subjected to secondary alterations. The Type A CAI GR4 is primarily composed of melilite with spinel and pyroxene occurring as minor phases. The rim of the inclusion does not exhibit distinct layered structure and secondary alteration products (garnet, Fe-rich olivine and Na-rich plagioclase) are present in some localized areas near the rim region. The average major element compositions of different mineral phases in GR4 are given. Preliminary REE data suggest a depletion of HREE relative to LREE by about a factor of 3 without any clear indication of interelement fractionation. The CAI GR7 has textural and minerological characteristics similar to Type B inclusions. The REE data show a pattern that is similar to Group 6 with enrichment in Eu and Yb. In addition, a depletion of HREE compared to LREE is also evident in this object. Melilite composition shows a broad range of akermanite content (Ak15-55). Detailed petrographic study is in progress. GR2 is a anorthite-rich Type C inclusion with large plagioclase laths intergrown with Ti-rich pyroxene. The average plagioclase composition is close to pure anorthite (An99).
Goswami Jitendra N.
Srinivasan Ganesan
Ulyanov Alexander
No associations
LandOfFree
Grosnaja ABCs: Magnesium isotope compositions 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 Grosnaja ABCs: Magnesium isotope compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Grosnaja ABCs: Magnesium isotope compositions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1448473