Item type |
紀要論文(ELS) / Departmental Bulletin Paper(1) |
公開日 |
1986-07-01 |
タイトル |
|
|
言語 |
en |
|
タイトル |
REE, Rb-Sr and Pb isotopic characteristics of the Yamato-791197 meteorite: Evidence for a lunar highland origin |
言語 |
|
|
言語 |
eng |
資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
departmental bulletin paper |
ページ属性 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
P(論文) |
著者名(英) |
Nakamura,Noboru
Unruh,Daniel M.
Tatsumoto,Mitsunobu
|
著者所属(英) |
|
|
|
en |
|
|
Department of Earth Sciences, Faculty of Science, Kobe University/U.S. Geological Survey,MS 963, Box 25046, Denver Federal Center/U.S. Geological Survey,MS 963, Box 25046, Denver Federal Center |
抄録(英) |
|
|
内容記述タイプ |
Other |
|
内容記述 |
Rb-Sr systematics, Pb isotopic composition, and REE, Ba, Sr, Rb, K, Ca, Mg and Fe concentration analyses were carried out for matrix and clasts from the anorthositic breccia, Yamato-791197 meteorite. Major and trace element abundances in the matrix and clasts are similar to those in lunar anorthositic rocks. The estimated initial ^<87>Sr/^<86>Sr ratio for two anorthositic clasts at 4.55 b. y. is similar to the lunar initial ratio (LUNI) and lower than BABI, which is consistent with lunar origin of the meteorite. The LUNI model ages for two split of the matrix are 4.0 and 4.1 b. y., indicating that the Rb-Sr system of the matrix was perturbed by a late event. One matrix sample shows very high ^<207>Pb/^<204>Pb (=118-129) and high ^<207>Pb/^<206>Pb (=1.05) ratios which are characteristic of lunar anorthosite Pb, and which are unique among solar system samples thus far analyzed. One anorthositic clast shows a Pb isotopic composition similar to that of lunar soils or mare basalts. Consequently, the Pb data provide strong evidence for a lunar origin of the meteorite. Chemical compositions including high Pb concentrations together with very low ^<87>Sr/^<66>Sr ratios and unique Pb isotopic compositions suggest that the meteorite represents an unsampled type of lunar highland rock which may have formed at 4.55 b. y. and brecciated at <4.0 b. y. |
雑誌書誌ID |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA00733561 |
書誌情報 |
Memoirs of National Institute of Polar Research. Special issue
巻 41,
p. 106-115,
発行日 1986-07
|