Other
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4813k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, p. 4813
Other
1
Meteoritic Composition, Lunar Composition, Apollo 16 Flight, Regolith, Lunar Core, Iron Meteorites, Neutron Activation Analysis, Ferromagnetic Resonance
Scientific paper
Samples from every half-cm dissection interval of Apollo 16 mission double drive tube sections were analyzed by magnetic techniques for metallic iron concentration and surface maturity parameter Is/FeO, and by neutron activation for concentrations of 25 lithophile and siderophile elements. Core 60013/14 is one of three regolith cores taken in a triangular array 40-50 m apart on the Cayley plains of the moon. The core can be divided into three zones based both on Is/FeO and composition. Unit A (0-44 cm depth) is compositionally similar to other soils from the surface of the central region of the site and is mature throughout, although maturity decreases with depth. Unit B (44-59 cm) is submature and compositionally more feldspathic than Unit A. Regions of lowest maturity in Unit B are characterized by lower Sm/Sc ratios than any soil obtained from the Cayley plains. Unit C (59-62 cm) is more mature than Unit B and compositionally equivalent to an 87:13 mixture of soil such as that from Unit A and plagioclase such as found in ferroan anorthosite. Similar soils, but containing greater abundances of anorthosite (plagioclase), are found at depth in the other two cores of the array.
Korotev Randy L.
Morris Richard V.
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