Ferrobasalts from Mare Crisium: Luna 24
1977; American Geophysical Union; Volume: 4; Issue: 10 Linguagem: Inglês
10.1029/gl004i010p00497
ISSN1944-8007
Autores Tópico(s)Geology and Paleoclimatology Research
ResumoSoils from the Soviet Luna 24 mission to Mare Crisium contain fragments of ferrobasalt and ferrogabbro. The ferrobasalt is very low in Ti content (∼ 1.0 wt.% TiO 2 ), similar to very low Ti “VLT” basalts from Apollo 17. It is characterized by Mg/(Mg + Fe) ∼ 0.3‐0.4, Al 2 O 3 ∼ 13%, CaO ∼ 13%, and Cr 2 O 3 ∼ 0.2‐0.3%. Brown glasses and micropoikilitic fragments similar to the ferrobasalt occur in the Crisium soils, and green glasses similar to the Apollo 17 VLT basalt have been found. There is growing evidence that very low Ti basalts may be an abundant mare basalt type; there is a possibility that this suite may be derived by crystal fractionation from magma similar to green glass in composition.
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