| タイトル | Derivation of Apollo 14 High-Al Basalts from Distinct Source Regions at Discrete Times: New Constraints |
| 本文（外部サイト） | http://hdl.handle.net/2060/20080030260 |
| 著者（英） | Nyquist, L. E.; Shih, C.-Y.; Kramer, G. Y.; Neal, C. R.; Reese, Y. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2006-03-13 |
| 言語 | eng |
| 内容記述 | Apollo 14 basalts occur predominantly as clasts in breccias, but represent the oldest volcanic products that were returned from the Moon [1]. These basalts are relatively enriched in Al2O3 (11-16 wt%) compared to other mare basalts (7-11 wt%) and were originally classified into 5 compositional groups [2,3]. Neal et al. [4] proposed that a continuum of compositions existed. These were related through assimilation (of KREEP) and fractional crystallization (AFC). Age data, however, show that at least three volcanic episodes are recorded in the sample collection [1,5,6]. Recent work has demonstrated that there are three, possibly four groups of basalts in the Apollo 14 sample collection that were erupted from different source regions at different times [7]. This conclusion was based upon incompatible trace element (ITE) ratios of elements that should not be fractionated from one another during partial melting (Fig. 1). These groups are defined as Group A (Groups 4 & 5 of [3]), Group B (Groups 1 & 2 of [3]), and Group C (Group 3 of [3]). Basalt 14072 is distinct from Groups A-C. |
| NASA分類 | Geophysics |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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