| タイトル | Volcanic Coatings on Picritic Apollo 17 Glasses; Submicrometer-Deposits of Fe-CR-Metal |
| 本文（外部サイト） | http://hdl.handle.net/2060/20100005632 |
| 著者（英） | Clementt, S. J.; Ross, K.; Thomas-Keprta, K. L.; Wentworth, S. J.; McKay, David S. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2010-01-01 |
| 言語 | eng |
| 内容記述 | The purposes of our ongoing investigations of Apollo 15 green and Apollo 17 orange and black volcanic glasses are threefold: first, to increase our understanding of the volcanic origin of the glasses; second, to determine the nature of the coating materials deposited on the glasses during their cooling in the volcanic environment; and, third, to help determine the nature of the gases involved in the volcanic fire-fountaining that occurred at approximately 3.5 Ga on the moon. We are continuing studies of coatings on volcanic glasses using analytical techniques not available when these glasses were originally studied; these include high-resolution FE-TEM and X-ray mapping, along with other highly detailed methods including TEM electron diffraction analysis. Initial studies of Apollo 15 green volcanic glasses using the techniques described above revealed for the first time the presence of areas containing distinct layering of volcanic surface deposits. S was associated with some of the inner layer of metallic Fe but was absent from the outer layer. Zn was associated with S in some places in the inner layer. An example of a typical spherule used for this study is shown in Fig. 1. It is a black (quench-crystallized) bead from near the bottom of the 74001/2 double drive tube; black beads such as this one are essentially identical in composition to the orange (uncrystallized) beads of the 74001/2 core. |
| NASA分類 | Geosciences (General) |
| レポートNO | JSC-CN-19736 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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