Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982chjss...2..205h&link_type=abstract
Chinese Journal of Space Sciences, vol. 2, July 1982, p. 205-208. In Chinese, with abstract in English.
Physics
Apollo 17 Flight, Basalt, Lunar Maria, Lunar Rocks, Uranium, Crystallization, Fragments, Polycarbonates, Pyroxenes
Scientific paper
The U-content and U-distribution in 70017-291 lunar mare basalts have been studied by means of fission tracks using pure muscovite sheets and polycarbonate foils as track detectors. The samples were irradiated in the thermal column of a heavy water reactor; after irradiation, the muscovite sheets and polycarbonate foils were removed and etched in 40 percent HF at 25 C for 20 min and in 6 N NaOH at 70 C for 10 min. The U-concentration in basaltic fragments range from 3.0 ppb to 43.4 ppb, and in pyroxene from 0.95 ppb to 15 ppb. The pyroxene data show a tendency to decreasing U-concentration with increasing crystal size. The U-microdistribution pattern of rock fragments shows that U is mainly concentrated in intergranular material. The higher the silicon content, the higher the U-content. This is due to the residual liquid being preferentially isolated in the final stage of crystallization, and being highly enriched in U.
Deng Xiao-Long
Guo S.-L.
Hu Ren-Yu
Liu Shujuan
Meng Wei
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