Normal and reverse zoning in niningerite - A novel key parameter to the thermal histories of EH-chondrites

Details Normal and reverse zoning in niningerite - A novel key parameter to the thermal histories of EH-chondrites Normal and reverse zoning in niningerite - A novel key parameter to the thermal histories of EH-chondrites

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..877e&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 52, April 1988, p. 877-887. DFG-supported research.

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Carbonaceous Chondrites, Enstatite, Meteoritic Composition, Solar Corona, Chemical Reactions, Electron Microscopy, Electron Probes, Meteorites, Zoning, Niningerite, Thermal History, Stony Meteorites, E Chondrites, Chondrites, Grains, Samples, Meteorite, Abe, Kaidun, South Oman, St. Marks, Yamato 74370, Indarch, Yamato 691, Qingzhen, Iron, Composition, Diffusion, Cooling, Comparisons, Parent Bodies, Thermal Effects, Accretion, Origin, Formation, Cores, Procedure, Laboratory Studies, Petrography, Photomicrogr

Scientific paper

Niningerite zoning features in eight EH chondrites are characterized by means of reflected-light studies, backscattered-electron SEM, and EMPA (at 15 keV, with sample current 15 nA and beam resolution 500 nm). The results are presented in extensive tables, graphs, and micrographs and discussed in detail. In five of the chondrites, the zoning is found to be normal (Fe content decreasing from the core to the rim), consistent with origin in the solar nebula or the chondrite parent body. In the other three chondrites, however, the zoning is reversed (Fe content increasing toward the rim adjacent to troilite). This feature is attributed to inhomogeneous accretion (in the case of Qingzhen) or to either slow preaccretion cooling of FeS-rich niningerite or two-stage cooling (in the case of Indarch).

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