The widespread occurrence of high-calcium pyroxene in bright-ray craters on the Moon and implications for lunar-crust composition

被引：15

作者：

Ogawa, Y. ^{[1
]}

Matsunaga, T. ^{[2
]}

Nakamura, R. ^{[3
]}

Saiki, K. ^{[4
]}

Ohtake, M. ^{[5
]}

Hiroi, T. ^{[6
]}

Takeda, H.

Arai, T. ^{[7
]}

Yokota, Y. ^{[2
]}

Yamamoto, S. ^{[2
]}

Hirata, N. ^{[1
]}

Sugihara, T. ^{[8
]}

Sasaki, S. ^{[10
]}

Haruyama, J.

Morota, T. ^{[9
]}

Honda, C. ^{[1
]}

Demura, H. ^{[1
]}

Kitazato, K. ^{[1
]}

Terazono, J. ^{[1
]}

Asada, N. ^{[11
]}

机构：

[1] Univ Aizu, Res Ctr Adv Informat Sci & Technol, Aizu Wakamatsu, Fukushima 9658580, Japan

[2] Natl Inst Environm Studies, Ctr Environm Measurement & Anal, Tsukuba, Ibaraki 3058506, Japan

[3] Natl Inst Adv Ind Sci & Technol, Informat Technol Res Inst, Tsukuba, Ibaraki 3058561, Japan

[4] Osaka Univ, Dept Earth & Space Sci, Toyonaka, Osaka 5600043, Japan

[5] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa 2298510, Japan

[6] Brown Univ, Dept Geol Sci, Providence, RI 02912 USA

[7] Chiba Inst Technol, Planetary Explorat Res Ctr, Narashino, Chiba 2750016, Japan

[8] Japan Agcy Marine Sci & Technol, Ctr Deep Earth Explorat, Kanazawa Ku, Yokohama, Kanagawa 2360001, Japan

[9] Natl Inst Nat Sci, Natl Astron Observ Japan, RISE Project Off, Mitaka, Tokyo 1818588, Japan

[10] Natl Inst Nat Sci, Natl Astron Observ Japan, RISE Project Off, Mizusawa, Iwate 0230861, Japan

[11] Univ Aizu, Multimedia Syst Lab, Aizu Wakamatsu, Fukushima 9658580, Japan

来源：

GEOPHYSICAL RESEARCH LETTERS | 2011年 / 38卷

关键词：

ANORTHOSITE; MAGMASPHERE;

D O I：

10.1029/2011GL048569

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We investigated the continuous spectral features of fresh craters on the Moon accompanied by distinctive bright rays, with cavity diameters between 8 and 24 km. We used the data from the Spectral Profiler onboard SELENE (Kaguya) to gain a better understanding of the composition of the lunar highland crust. We found that the observed spectra exhibited strong symmetric absorption around 1 mu m and recognizable absorption around 1.3 mu m. The spectra around a few craters showed a drastic change in the relative strengths of these two absorption bands s(1.3/1.0) at different locations in and around the craters, indicating differences in the abundance of plagioclase and mafic minerals. In contrast, the spectra around most of the craters showed no significant variation in spectral shape, with an essentially constant s(1.3/1.0). We analyzed the absorption features of the craters with an essentially constant s(1.3/1.0) using the Modified Gaussian Model. We found that the strongest symmetric absorption bands were centered at 0.97-1.01 mu m with s(1.3/1.0) approximate to 0.2-0.6. Comparing these values with data from known samples, we concluded that high-calcium pyroxene (HCP) is the most plausible dominant mafic mineral identified from the observed spectra. The fact that we detected such HCP-dominant spectra among rayed craters widely spaced across the lunar highland implies that the major mafic component of some portions of the lunar crust is HCP rather than low-calcium pyroxene (LCP). Citation: Ogawa, Y., et al. (2011), The widespread occurrence of high-calcium pyroxene in bright-ray craters on the Moon and implications for lunar-crust composition, Geophys. Res. Lett., 38, L17202, doi: 10.1029/2011GL048569.

引用

页数：6