Geochemistry and mineralogy of a feldspathic lunar meteorite (regolith breccia), Northwest Africa 2200

Hiroshi Nagaoka*, Yuzuru Karouji, Tomoko Arai, Mitsuru Ebihara, Nobuyuki Hasebe

*この研究の対応する著者

研究成果: Article査読

8 被引用数 (Scopus)

抄録

The lunar meteorite Northwest Africa (NWA) 2200 is a regolith breccia with a ferroan feldspathic bulk composition (Al2O3=30.1wt.%; Mg#=molar 100×Mg/(Mg+Fe)=59.2) and low Th content (0.42μg/g). Lithologically, NWA 2200 is a diverse mixture of lithic and glassy clasts, mineral fragments, and impact glass spherules, all embedded in a dark glassy matrix. NWA 2200 contains some feldspathic brecciated rock components (ferroan anorthositic granulitic breccia, poikiloblastic granulitic breccia, and glassy melt breccia with an intersertal texture). The bulk compositions of these brecciated components indicate they are derived from ferroan troctolitic or noritic anorthosite lithologies (bulk Al2O3=26-30wt.%; bulk FeO/MgO>1.0). The bulk composition of NWA 2200 is more ferroan and feldspathic than the Apollo feldspathic regolith samples and feldspathic lunar regolith meteorites, and is also more depleted in incompatible elements (e.g., rare earth elements) than Apollo 16 feldspathic regolith samples. We conclude that NWA 2200 originated from a location different to the Apollo landing sites, and may have been sourced from the ferroan KREEP-poor highlands, "KREEP" materials are enriched in such elements as potassium (K), rare earth elements (REE), phosphorus (P).

本文言語English
ページ(範囲)241-259
ページ数19
ジャーナルPolar Science
7
3-4
DOI
出版ステータスPublished - 2013 9月
外部発表はい

ASJC Scopus subject areas

  • 生態、進化、行動および分類学
  • 水圏科学
  • 生態学
  • 地球惑星科学(全般)

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