| タイトル | Sources of mineral fragments in impact melts 15445 and 15455 - Toward the origin of low-K Fra Mauro basalt |
| 著者（英） | Mccormick, K. A.; Taylor, G. J.; Keil, K.; Spudis, P. D.; Ryder, G. |
| 著者所属（英） | Lunar and Planetary Inst.|New Mexico Univ.|EG and G Energy Measurements, Inc.|Hawaii Univ.|Geological Survey |
| 発行日 | 1991-01-01 |
| 言語 | eng |
| 内容記述 | The compositions of major and minor elements in mineral clasts in low-K Fra Mauro (LKFM) are studied in order to gain a deeper understanding of the genesis of LKFM and its primogenitors. The fragments are picked up as the impact melt moves outward from the center of the target. It is suggested that most of the mineral debris found in the melts is derived from troctolites of the Mg-suite. The chemical end member that dominates the LKFM melt matrics is not present as either mineral or lithic clastic debris in these melt rocks. It is proposed that the missing chemical component of LKFM could have been a magma, existing within the crust 3.9 Ga ago, and was either ejected intact to form LKFM melt rocks or was mixed with other shock-melted crusted and mantle rocks to produce the LKFM compositions. Assimilation of lithic and mineral clasts into the melt after breccian assembly is not a significant process and cannot be adduced to explain the LKFM melt/clast dichotomy. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 91A42342 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/347432 |
