Luna 16: Some Li, K, Rb, Sr, Ba, rare-earth, Zr, and Hf concentrations

Philpotts, J. A.; Schnetzler, C. C.; Bottino, Michael L.; Schuhmann, S.; Thomas, H. H.

doi:10.1016/0012-821x(72)90120-3

Cited by 33 publications

(4 citation statements)

References 6 publications

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“…12b-c), including the Apollo 12 ilmenite basalts (Haskin et al 1971;Neal et al 1994). The exceptions are NWA 032, the high-Al basalts of Luna 16 (Philpotts et al 1972;Helmke and Haskin 1972;Ma et al 1979), and some Apollo 14 high-Al basalts (Dickinson et al 1985;Shervais et al 1985;Neal et al 1989aNeal et al , 1989b. Relative concentrations of REEs in the LAP basalt are also dissimilar to those of most other lunar basalts (Fig.…”

Section: Bulk Composition and Comparison To Other Lunar Basaltsmentioning

confidence: 99%

Petrography and geochemistry of the LaPaz Icefield basaltic lunar meteorite and source crater pairing with Northwest Africa 032

Zeigler

Korotev

Jolliff

et al. 2005

Meteoritics &Amp; Planetary Science

116

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Abstract-We report on the bulk composition and petrography of four new basaltic meteorites found in Antarctica-LAP (LaPaz Icefield) 02205, LAP 02224, LAP 02226, and LAP 02436-and compare the LAP meteorites to other lunar mare basalts. The LAP meteorites are coarse-grained (up to 1.5 mm), subophitic low-Ti basalts composed predominantly of pyroxene and plagioclase, with minor amounts of olivine, ilmenite, and a groundmass dominated by fayalite and cristobalite. All of our observations and results support the hypothesis that the LAP stones are mutually paired with each other. In detail, the geochemistry of LAP is unlike those of any previously studied lunar basalt except lunar meteorite NWA (Northwest Africa) 032. The similarities between LAP and NWA 032 are so strong that the two meteorites are almost certainly source crater paired and could be two different samples of a single basalt flow. Petrogenetic modeling suggests that the parent melt of LAP (and NWA 032) is generally similar to Apollo 15 low-Ti, yellow picritic glass beads, and that the source region for LAP comes from a similar region of the lunar mantle as previously analyzed lunar basalts.

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Section: Bulk Composition and Comparison To Other Lunar Basaltsmentioning

confidence: 99%

Petrography and geochemistry of the LaPaz Icefield basaltic lunar meteorite and source crater pairing with Northwest Africa 032

Zeigler

Korotev

Jolliff

et al. 2005

Meteoritics &Amp; Planetary Science

116

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show abstract

“…Apollo 14 data is fromDickinson et al (1985),Shervais et al (1985), andNeal et al (1989a,b). Luna 16 data are from:Ma et al (1979),Philpotts et al (1971), andKorotev et al (1988).…”

mentioning

confidence: 99%

The geochemistry and provenance of Apollo 16 mafic glasses

Zeigler

Korotev

Jolliff

et al. 2006

Geochimica et Cosmochimica Acta

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“…(, ), and Neal and Kramer (); those for Luna 16 are from Philpotts et al. () and Ma et al. (); those for 12038 are from Neal (); those for KREEP are from Warren and Wasson ().…”

Section: Discussionmentioning

confidence: 99%

“…Luna 16 high‐Al basalts also show a convex‐upward REE pattern (Philpotts et al. ; Ma et al. ), whose HREE and LREE both display a more fractionated pattern than those of NWA 4898 ([Gd/Lu] N = 1.59–1.71, [La/Sm] N = 0.81–1.02).…”

Section: Discussionmentioning

confidence: 99%

Petrogenesis of the Northwest Africa 4898 high‐Al mare basalt

Hsu

Guan

et al. 2016

Meteorit & Planetary Scien

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Abstract-Northwest Africa (NWA) 4898 is the only low-Ti, high-Al basaltic lunar meteorite yet recognized. It predominantly consists of pyroxene (53.8 vol%) and plagioclase (38.6 vol %). Pyroxene has a wide range of compositions (En 12-62 Fs 25-62 Wo 11-36 ), which display a continuous trend from Mg-rich cores toward Ca-rich mantles and then to Fe-rich rims. Plagioclase has relatively restricted compositions (87)(88)(89)(90)(91)(92)(93)(94)(95)(96) Or 0-1 Ab 4-13 ), and was transformed to maskelynite. The REE zoning of all silicate minerals was not significantly modified by shock metamorphism and weathering. Relatively large (up to 1 mm) olivine phenocrysts have homogenous inner parts with Fo~74 and sharply decrease to 64 within the thin out rims (~30 lm in width). Four types of inclusions with a variety of textures and modal mineralogy were identified in olivine phenocrysts. The contrasting morphologies of these inclusions and the chemical zoning of olivine phenocrysts suggest NWA 4898 underwent at least two stages of crystallization. The aluminous chromite in NWA 4898 reveals that its high alumina character was inherited from the parental magma, rather than by fractional crystallization. The mineral chemistry and major element compositions of NWA 4898 are different from those of 12038 and Luna 16 basalts, but resemble those of Apollo 14 high-Al basalts. However, the trace element compositions demonstrate that NWA 4898 and Apollo 14 high-Al basalts could not have been derived from the same mantle source. REE compositions of its parental magma indicate that NWA 4898 probably originated from a unique depleted mantle source that has not been sampled yet. Unlike Apollo 14 high-Al basalts, which assimilated KREEPy materials during their formation, NWA 4898 could have formed by closed-system fractional crystallization.

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Luna 16: Some Li, K, Rb, Sr, Ba, rare-earth, Zr, and Hf concentrations

Cited by 33 publications

References 6 publications

Petrography and geochemistry of the LaPaz Icefield basaltic lunar meteorite and source crater pairing with Northwest Africa 032

Petrography and geochemistry of the LaPaz Icefield basaltic lunar meteorite and source crater pairing with Northwest Africa 032

The geochemistry and provenance of Apollo 16 mafic glasses

Petrogenesis of the Northwest Africa 4898 high‐Al mare basalt

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