| タイトル | Magnesian anorthosites from the western highlands of the Moon: Isotope geochemistry and petrogenesis |
| 著者（英） | Halliday, Alex N.; Snyder, Gregory A.; Taylor, Lawrence A. |
| 著者所属（英） | Tennessee Univ. |
| 発行日 | 1993-01-01 |
| 言語 | eng |
| 内容記述 | Breccias from the Apollo 14 landing site have provided a wealth of information on the genesis of the lunar highlands. Various pristine rock-types have been discovered in relative abundance including rare ferroan anorthosites and alkali-suite and magnesian-suite rocks. Mineral-chemical and radiogenic isotopic data are reported here for a newly discovered Mg-suite anorthosite from Apollo 14, sample 14303,347. Meyer et al. reported U-Pb zircon analyses of Mg-suite highlands rocks from the western limb of the Moon. We have compiled these ages and generated a weighted average age of 4211 = 6 Ma; some 200 Ma younger than ferroan anorthosites. Utilizing this age for Mg-anorthosite 14303,347, our data results in an initial epsilon(sub Nd) value of -1.0 and initial Sr-87/Sr-86 of 0.69915. Based on trace-element, isotopic, and mineral-chemical data, the western highlands Mg-suite is interpreted to be crustal precipitates of a picritic magma, which assimilated KREEPy trapped liquid from upper-mantle cumulates during its transport to the crust. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 94N20779 |
| 権利 | No Copyright |
|
