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Post Info TOPIC: Guangnan meteorite
Blobrana


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RE: Guangnan meteorite
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Name: GUANGNAN
Place of fall: Guangnan, Yunnan province, China
24°6'N., 105°0'E.
Date of fall: February 7, 1983
Class and type: Stone. Olivine-hypersthene chondrite (L6). Olivine Fa24.9.
Number of individual specimens: Not reported
Total weight: Not reported
Circumstances of fall: Not reported
Source



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Title: Guangnan (L6) and Ningqiang (CV3) - Exposure ages and radiogenic ages of two unusual chondrites
Authors: Eugster, O., Michel, T., & Niedermann, S.

The radiogenic ages and Galactic cosmic-ray exposure ages (EAs) of two unusual chondrites are determined by measuring their noble-gas isotope abundances. The results are presented in tables and analysed. Guangnan is found to have EA 2.9 ±0.4 Myr, low concentrations of radiogenic He-4 and Ar-40, U/Th-(He-4) age 27 ±16 Myr, and (K-40)-(Ar-40) age 142 ±14 Myr, consistent with significant gas loss no later than the onset of cosmic-ray exposure. Ningqiang has EA 42.2 ±4.0 Myr, U/Th-(He-4) age 4.17 ±0.16 Gyr, and (K-40)-(Ar-40) age 4.26 ±0.07 Gyr.

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Blobrana


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The Guangnan (L6) meteorite fell in Yunnan, China, on the 7th February, 1983.

24° 6'N, 105° 0'E



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