On the thermal history of heavily shocked Yanzhuang H-chondrite

Details On the thermal history of heavily shocked Yanzhuang H-chondrite On the thermal history of heavily shocked Yanzhuang H-chondrite

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992metic..27..174b&link_type=abstract

Meteoritics (ISSN 0026-1114), vol. 27, no. 2, June 1992, p. 174-178.

Mathematics

Logic

13

Chondrites, Meteoritic Composition, Thermal Shock, Meteoritic Microstructures, Neutron Activation Analysis, Rare Gases

Scientific paper

Partly shocked-melted Yanzhuang H-chondrite, now classified as petrological type H6 but before the shock event of type H4, was subjected to the shock-heating 2.6 Ma ago at the time it was spalled off its parent body and came into being as a meteoroid of ca. 30 cm radius. At that time the unmelted portion of the meteoroid suffered an almost complete loss of its radiogenic He-4 and Ar-40, while the contents of the most volatile nonnoble gas elements Zn and Se were not measurably affected. The melted portion of Yanzhuang is also essentially void of radiogenic He-4(10 +/- 4 x 10 exp -8 cu cm STP/g) but it has retained some 80 percent of its radiogenic Ar-40, presumably because in the melt, the increase of the diffusion length more than compensated the increase of the diffusion constant.

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