Paired lunar meteorites MAC88104 and MAC88105: A new FAN of lunar petrology

Conference · Fri Nov 01 00:00:00 EST 1991 · Geochimica et Cosmochimica Acta; (United States)

OSTI ID:5171857

Neal, C R ^[1]; Taylor, L A ^[2]; Lui, Yungang; Schmitt, R A ^[3]

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1. Univ. of Tennessee, Knoxville (United States) Univ. of Notre Dame, IN (United States)
2. Univ. of Tennessee, Knoxville (United States)
3. Oregon State Univ., Corvallis (United States)

New lunar meteorite MAC88104/5 represents an exciting new opportunity to study a potentially unsampled region of the Moon. The authors have analyzed six thin sections by electron microprobe and three bulk samples by Instrumental Neutron Activation (INA) in order to determine the chemical characteristics of this new lunar sample. Lunar meteorite MAC88104/5 is dominated by lithologies of the ferroan anorthosite (FAN) suite and contains abundant granulitized highland clasts, devitrified glass beads of impact origin, and two small clasts which appear to be of basaltic origin. One of these basaltic clasts (clast E in MAC88105,84) is probably mesostasis material, whereas the second larger clast (clast G) may be similar to the Very Low-Ti (VLT) or low-Ti/high-alumina mare basalts. Impact melt clasts MAC88105,69 and ,72 have major and trace element compositions similar to the bulk meteorite. There is little evidence of any LKFM (Low-K Fra Mauro or low-K KREEP) contribution to this meteorite, as MAC88104/5 and other brecciated lunar meteorites are Fe-rich and poor in the incompatible elements relative to Apollo 16 regolith and feldspathic breccias. While the exact site of origin for the lunar meteorites cannot be pinpointed, it is evident that they were divided from a relatively KREEP-free ferroan anorthosite terrain.

• OSTI ID: 5171857
• Report Number(s): CONF-9003166-; CODEN: GCACA
• Journal Information: Geochimica et Cosmochimica Acta; (United States), Vol. 55:11; Conference: 21. lunar and planetary science conference, Houston, TX (United States), Mar 1990; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
LUNAR MATERIALS
CHEMICAL ANALYSIS
PETROLOGY
ANORTHOSITES
CHEMICAL COMPOSITION
ELECTRON MICROPROBE ANALYSIS
GEOCHEMISTRY
GEOLOGIC HISTORY
METEORITES
NEUTRON ACTIVATION ANALYSIS
PETROGENESIS
ACTIVATION ANALYSIS
CHEMISTRY
GABBROS
GEOLOGY
IGNEOUS ROCKS
MATERIALS
MICROANALYSIS
NONDESTRUCTIVE ANALYSIS
PLUTONIC ROCKS
ROCKS
580000* - Geosciences