Rare gases and Ca, Sr, and Ba in Apollo 17 drill-core finesTrapped gas isotopic compositions and spallation gas concentrations as functions of depth in the Apollo 17 drill core were determined from mass spectrometer studies by means of correlation techniques. The distribution of He, Ne, Ar, Kr, and Xe as well as Ca, Sr, and Ba was investigated, and rare-gas spallation and neutron capture profiles are compared with attention to proposed depositional models for the Taurus-Littrow regolith. The data exclude a sedimentation pattern similar to that found at the Apollo 15 site but are possibly compatible with long-term continuous accretion models or models of very recent rapid accumulation of regolith.
Document ID
19780062809
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Pepin, R. O. (Minnesota Univ. Minneapolis, MN, United States)
Dragon, J. C. (Minnesota Univ. Minneapolis, MN, United States)
Johnson, N. L. (Minnesota Univ. Minneapolis, MN, United States)
Bates, A. (Minnesota Univ. Minneapolis, MN, United States)
Coscio, M. R., Jr. (Minnesota Univ. Minneapolis, MN, United States)
Murthy, V. R. (Minnesota, University Minneapolis, Minn., United States)