Thermal history and trapped Ar-40/Ar-36 ratio on Xinyang meteorite

Details Thermal history and trapped Ar-40/Ar-36 ratio on Xinyang meteorite Thermal history and trapped Ar-40/Ar-36 ratio on Xinyang meteorite

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985chjss...5..308w&link_type=abstract

Chinese Journal of Space Science, vol. 5, Oct. 1985, p. 308-313. In Chinese, with abstract in English.

Computer Science

Argon Isotopes, Chondrites, Chronology, Meteoritic Composition, Temperature Dependence, Calcium, China, Cooling, Outgassing

Scientific paper

The Xinyang meteorite is an ordinary chondrite, classified as belonging to group H6, and consisting mainly of X-I and X-II fragments with respective masses of 48 kg and 27.5 kg. The Ar-49/Ar-39 age spectrum of X-II is quite complex, and shows a diffusional loss profile. The gas released at low temperature yields low ages, with apparent age increasing monotonically with increasing temperature. The low-middle temperature release of abundant Ar-40 is associated with Ca-poor phases, undoubtedly plagioclase. The high-temperature release of Ar-40 is from Ca-rich phases with low K/Ca ratios, almost certainly bronzite. Possible ages of the bronzite and plagioclase are 4.46 and 4.42 b.y., respectively. The Zr-40/Ar-39 age spectrum of the meteorite shows that there was a collisional event 2.95 b.y. ago.

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