Physics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983lpsc...14..211n&link_type=abstract
(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge
Physics
3
Lunar Evolution, Lunar Surface, Manganese Isotopes, Radioactive Age Determination, Regolith, Apollo 17 Flight, Core Sampling, Lunar Craters, Lunar Soil, Moon, Manganese 53, Core Samples, Samples, Lunar, 15011, Abundance, Depth, Surface, Soil, Irradiation, 64002, Source, Origin, 74002, Laboratory Studies, Procedure, 70009, Drive Tubes, Isotopes, Analysis
Scientific paper
Mn-53 data are presented for four Apollo cores with an emphasis on the past 10-to-the-7th-year history of these samples: (1) Core 15011 has excess Mn-53 down to a depth of at least 9 cm, which is probably due to the continuous addition of near-surface irradiated material. (2) The Mn-53 profile for 64002 above 12 cm is relatively flat and in excess of that calculated for a static core, which suggests that the upper part of this core was deposited rapidly about 2 m.y. ago. (3) Results for the Apollo 17 drill stem show a large excess of Mn-53 from at least 3 cm downwards. Some magnetic separates obtained from this core have very high Mn-53 activities, probably due to the presence of agglutinates that were recently irradiated very near the surface. (4) The Mn-53 content of the upper part of 74002 is similar to that of trench samples collected nearby and indicates that the gray, orange, and black soils at this site have been exposed together near the surface for at least the last 10 m.y.
Arnold James R.
Murrell Michael T.
Nishiizumi Kuni
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