Early active sun - Radiation history of distinct components in finesPlagioclase feldspars were separated from lunar soil samples and their compositions were determined by electron-microprobe analysis followed by etching and track counting in an effort to find effects of early solar activity. The feldspars were assigned on this basis to three major lithologies: mare basalts, anorthositic rocks, and KREEP rock. The results are in sharp contrast to Poupeau et al.'s (1973) observations on track densities in plagioclase crystals in the Luna 16 soil: no evidence is found for an early active sun, although the evidence does not preclude this possibility, either.
Document ID
19750055633
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Crozaz, G.
Taylor, G. J.
Walker, R. M. (Washington University St. Louis, Mo., United States)
Seitz, M. G. (Carnegie Institution of Washington Washington, D.C., United States)