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Title:
Hansteen Alpha: A volcanic construct in the lunar highlands
Authors:
Hawke, B. Ray; Lawrence, D. J.; Blewett, D. T.; Lucey, P. G.; Smith, G. A.; Spudis, P. D.; Taylor, G. J.
Publication:
Journal of Geophysical Research Planets, Volume 108, Issue E7, pp. 5-1, CiteID 5069, DOI 10.1029/2002JE002013 (JGRE Homepage)
Publication Date:
07/2003
Origin:
AGU
AGU Keywords:
Volcanology: Planetary volcanism (5480), Planetology: Solar System Objects: Moon (1221), Planetary Sciences: Composition, Geochemistry: Planetary geochemistry (5405, 5410, 5704, 5709, 6005, 6008), Planetary Sciences: Remote sensing
DOI:
10.1029/2002JE002013
Bibliographic Code:
2003JGRE..108.5069H

Abstract

We have used data from the Clementine and Lunar Prospector spacecraft in conjunction with near-IR reflectance spectra collected with Earth-based telescopes to study the composition and origin of Hansteen Alpha, an arrowhead-shaped highlands feature located on the southern margin of Oceanus Procellarum. Hansteen Alpha is a member of a class of lunar spectral anomalies (Red Spots) that are characterized by a relatively high albedo and a strong absorption in the UV. It has been suggested that at least some of these spectral anomalies were produced by nonmare volcanism. The stratigraphic relationships among the geologic and compositional units in the region show that Hansteen Alpha was emplaced by extrusive igneous processes. The Imbrian-aged craters Hansteen and Billy emplaced relatively FeO- and TiO2-rich ejecta. Hansteen Alpha exhibits much lower FeO and TiO2 values. If Hansteen Alpha was present prior to the Billy and Hansteen impact events, it should have been covered with FeO- and TiO2-rich ejecta because it is located within one crater diameter of the rim crest of each crater. Since it is not, Hansteen Alpha was superposed on these ejecta units. Nonmare volcanism is the only viable process for the formation of Hansteen Alpha. The morphology and surface texture of Hansteen Alpha is similar to many terrestrial features of dacitic and rhyolitic composition formed by extrusions of relatively viscous lavas. Such highly evolved compositions should be very enriched in Th, but Hansteen Alpha exhibits Th abundances of ~6 ppm. Hence Hansteen Alpha is not composed of a highly evolved highlands lithology.
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