Mathematics – Logic
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..501h&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 501.
Mathematics
Logic
4
Chondrule, Serpentine, Aqueous Solutions, Carbonaceous Chondrites, Transmission Electron Microscopy, Magnesium
Scientific paper
Attempts to use matrix and matrix serpentine compositions to define an alteration sequence for the CM chondrites are compromised by the significant compositional overlap from one CM chondrite to another. Here we present an alternative approach for constraining the alteration degree of CM chondrites based on the alteration mineralogy and mineral compositions of different chondrule types in CM chondrites. Individual chondrules represent systems whose primary textural and mineralogical characteristics are much better constrained than in matrix. Our goal has been to understand how specific chondrule types respond to progressive aqueous alteration by studying their alteration assemblages in CM chondrites with varying degrees of aqueous alteration and brecciation. The preliminary results of our study indicate that this approach has considerable promise in establishing a precise alteration sequence for the CM chondrites. Mesostasis in chondrules of all the CM chondrites studied has been altered, whereas the replacement of primary crystalline silicates progressively increases from Murray to ALH 84034. Our results show that type IAB chondrules with occurrences of Ca-pyroxene crystallites in the altered mesostasis and type IIA chondrules with diameters between 100 and 300mm show remarkably systematic behavior, whereas type IA chondrules display more complexity.
Brearley Adrian J.
Hanowski Nicolaus P.
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