Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..30..222a&link_type=abstract
Earth and Planetary Science Letters, vol. 30, no. 2, May 1976, p. 222-233. Research supported by the Natural Environment Resear
Physics
7
Achondrites, Agglomeration, Chondrites, Metamorphism (Geology), Meteoritic Microstructures, Petrography, Shock Loads, Lithology, Photomicrography, Pyroxenes, Recrystallization, Shock Heating
Scientific paper
On the basis of high voltage electron microscope observations an assessment is made of the role of shock-lithification in the histories of four gas-rich meteorites: an achondrite (Khor Temiki) and three chondritic specimens with differing optical petrographic characteristics, (Weston, St. Mesmin, and Pantar). All specimens studied are apparently shock-lithified. The Khor Temiki and Weston specimens are Class A in terms of the electron petrographic classification of lunar breccias; the St. Mesmin and Pantar specimens are Class B. In the first two, relatively mild shocks apparently produced amorphous cement between matrix grains. In the St. Mesmin and Pantar specimens recrystallization of some deformed material is attributed to shock-heating, which was not sustained long enough to erase all cosmic ray tracks in large grains. Results indicate that shock was an effective agent of chondrite metamorphism during late stages of parent-body accretion.
Ashworth John R.
Barber David J.
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