Mineralogy,petrology, and chemistry of a Luna 16 basaltic fragment,sample B-1 |
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Authors: | AL AlbeeAA Chodos AJ GancarzEL Haines DA PapanastassiouL Ray F TeraGJ Wasserburg T Wen |
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Institution: | The Lunatic Asylum, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91109,USA |
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Abstract: | Luna 16 sample B-1 was the largest fragment (62 mg) obtained in the sample exchange with the USSR. Petrologic, mineralogic, and chemical investigations have been made on this fragment in conjunction with Rb-Sr and40Ar/39Ar investigations by our colleagues. Sample B-1 is a fine-grained ophitic basalt but is distinguished from the Apollo samples by containing a single pyroxene, predominantly pigeonitic, an ilmenite content (7%) intermediate to that of the Apollo 11 and 12 samples, and subequal amounts of pyroxene (50%) and plagioclase (40%). Chemically it is distinguished by a high Sr content (437 ppm) and a high K/U value (4700). The K-content (1396 ppm) is higher than that of Luna 16 soil sample A-2. |
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