Iron and Titanium Concentrations in South Pole-Aitken Basin: Implications for Lunar Mantle Composition and Basin Formation

Details Iron and Titanium Concentrations in South Pole-Aitken Basin: Implications for Lunar Mantle Composition and Basin Formation Iron and Titanium Concentrations in South Pole-Aitken Basin: Implications for Lunar Mantle Composition and Basin Formation

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..783l&link_type=abstract

Lunar and Planetary Science, volume 27, page 783

Computer Science

2

Crust: Lunar, Dynamics: Impact, Dynamics: Mantle, Formations: Basin, Mantle: Lunar

Scientific paper

Recently, we reported on a technique to determine FeO content of soils from multispectral images of the Moon and applied this technique to global, low-resolution Clementine images to create a global iron map of the Moon. In this abstract, we utilize FeO and a new technique that allows us to map the concentration of titanium globally across the Moon. Using these data we find that the composition of the interior of the huge South Pole-Aitken (SPA) basin is unlike any major lunar rock type or model lunar mantle composition, although its ejecta (the highlands terrain immediately surrounding the basin rim) is typical of the lunar highlands (FeO of about 3-4 wt.%, TiO2 ~ 0.3 wt.%). The elevated FeO content of the basin floor may result from exposure of rocks from the mantle of the Moon. The TiO2 abundances suggest that the floor of SPA could be a mixture of approximately equal parts of typical LKFM (lower crustal composition) and low-Ti mantle rocks with 10-16 wt.% FeO. This FeO content is in the range of likely mantle compositions. This mixture would have a Th concentration of about half the level in LKFM, or about 2-4 ppm, as observed in the northern floor materials of SPA basin.

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