Microirghizites recovered from a sediment sample from the Zhamanshin impact structure

Details Microirghizites recovered from a sediment sample from the Zhamanshin impact structure Microirghizites recovered from a sediment sample from the Zhamanshin impact structure

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14..319g&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

1

Geochemistry, Impact Melts, Meteorite Craters, Planetary Craters, Silica Glass, Tektites, Chondrites, Metal Oxides, Nickel Compounds, Sediments, Spherules

Scientific paper

Microscopic glass spherules, called microirghizites, have been recovered from a stream deposit in the Zhamanshin crater. The microirghizites partly overlap the irghizites (tektites) and SiO2-rich zhamanshinites (impactites) in composition, but exhibit greater variations in composition and have lower average SiO2 contents. A similar relationship has been observed between microtektites and tektites in the Australasian, Ivory Coast, and North American strewn fields. The compositions and oxide trends observed for the microirghizites, SiO2-rich zhamanshinites and irghizites are rather similar to those observed for the Australasian microtektites and tektites. The major differences are the Al2O3 and FeO versus SiO2 trends, which could be explained by differences in amount of meteoritic contamination. The irghizites and microirghizites contain higher nickel contents (up to 0.41 percent) than the SiO2-rich zhamanshinites and Australasian tektites and microtektites. The major oxides versus silica trends for the microirghizites support a previous conclusion that the impacting body was a chondrite meteorite and the bulk parent material was terrestrial. Although the irghizites may have been more contaminated by the impacting body than were the SiO2-rich zhamanshinites, it is found that the major differences in composition between the irghizites and SiO2-rich zhamanshinites may be due to different parent materials rather than meteoritic contamination.

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