NDLI: Fib-tem investigations of fe-ni-sulfides in the ci chondrites alais and orgueil

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Fib-tem investigations of fe-ni-sulfides in the ci chondrites alais and orgueil

Content Provider	NASA Technical Reports Server (NTRS)
Author	Keller, L. P. Zega, T. J. Lauretta, D. S. Berger, Eve L.
Copyright Year	2013
Description	The CI chondrites are primitive meteorites with bulk compositions matching the solar photosphere for all but the lightest elements. They have been extensively aqueously altered, and are composed primarily of fine-grained phyllosilicate matrix material which is host to carbonates, sulfates, sulfides, and minor amounts of olivine and pyroxene. The alteration, while extensive, is heterogeneous. For example, CI-chondrite cubanite and carbonate grains differ on mm to sub-mm scales, demonstrating multiple aqueous episodes. CI-chondrite variability is also evidenced by degree of brecciation, abundance and size of coarse-grained phyllosilicates, olivine and pyroxene abundance, as well as Ni-content and size of sulfide grains. Our previous work revealed Orgueil sulfide grains with variable Ni-contents, metal:S ratios, crystal structures and textures. We continue to explore the variability of CI-chondrite pyrrhotite (Po, (FeNi)1-xS) and pentlandite (Pn, (Fe,Ni)9S8) grains. We investigate the microstructure of sulfides within and among CI-chondrite meteorites in order to place constraints on the conditions under which they formed.
File Size	746076
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20130011092
Archival Resource Key	ark:/13960/t4qk2dq1w
Language	English
Publisher Date	2013-03-18
Access Restriction	Open
Subject Keyword	Lunar And Planetary Science And Exploration Grain Size Olivine Pyroxenes Transmission Electron Microscopy Pyrrhotite Alais Meteorite Meteoritic Composition Nickel Carbonaceous Chondrites Iron Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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