Lunar mare versus terrestrial mid-ocean ridge basalts - Planetary constraints on basaltic volcanism

Details Lunar mare versus terrestrial mid-ocean ridge basalts - Planetary constraints on basaltic volcanism Lunar mare versus terrestrial mid-ocean ridge basalts - Planetary constraints on basaltic volcanism

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..803p&link_type=abstract

Geophysical Research Letters, vol. 5, Sept. 1978, p. 803-806.

Physics

4

Basalt, Earth Planetary Structure, Lunar Composition, Lunar Maria, Ocean Bottom, Volcanoes, Geochemistry, Lunar Evolution, Lunar Geology, Lunar Rocks, Petrology, Moon, Earth, Ridges, Volcanism, Basalts, Terrestrial, Lunar, Aluminum, Magnesium, Iron, Mantle, Sodium, Potassium, Alkalies, Magnetite, Fayalite, Mineralogy, Titanium, Chromium, Oxygen, Fugacity, Petrogenesis, Quartz

Scientific paper

Major differences which exist between terrestrial midocean ridge basalts (MORBs) and lunar mare basalts reflect the different planetary characteristics of earth and moon. MORBs are enriched in aluminum and have higher Mg/(Mg + Fe(2+)). These features reflect a more aluminum- and magnesium-rich mantle source for MORBs. Mare basalts are depleted in sodium and potassium relative to MORBs and, consequently, mare feldspars are depleted in the albite component relative to MORB feldspars; these features are a reflection of the alkali-depleted nature of the moon relative to earth. The oxygen fugacities that obtained during MORB petrogenesis follow the quartz-magnetite-fayalite buffer curve very closely, while those of mare basalts are several orders of magnitude lower. This results in reduced valence states for Fe, Cr, and Ti in mare basalts, which, in turn, has a significant effect on mineral-melt partitioning.

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