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Mons Hansteen is a mountain on the
Moon The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of ...
, also known as Hansteen Alpha (α), named after Christopher Hansteen. It is roughly triangular in shape and occupies an area about 30 km across on the western margin of
Oceanus Procellarum Oceanus Procellarum ( la, Ōceanus procellārum, lit=Ocean of Storms) is a vast lunar mare on the western edge of the near side of the Moon. It is the only one of the lunar maria to be called an "Oceanus" (ocean), due to its size: Oceanus Proc ...
, southeast of the crater Hansteen and north of the dark-floored crater Billy. It is thought to be an extrusion of volcanic material that is younger than the crater Hansteen, with most of surface volcanic ash been deposited 3.5-3.74 billion years ago. The Mons Hansteen belongs to rare class of non-mare moon volcanoes.


Composition

The extruded material is significantly enriched in silica, and strongly depleted in iron and titanium oxides compared to surrounding mare terrain. Initially, it was believed its lavas are not as evolved as in Compton–Belkovich Thorium Anomaly, but by 2004 the low thorium enrichment signal was attributed to small size of volcanic complex, making it composition compatible with highly processed silicic lavas. By 2013, a patchy deposits of magnesium
spinel Spinel () is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula in the cubic crystal system. Its name comes from the Latin word , which means ''spine'' in reference to its pointed crystals. Properties S ...
were detected in the central and western parts of the volcanic dome. The spinel-rich areas are associated with boulder fields, and fringed by areas showing a sign of hydration, with 4-8% of mineral by weight been hydroxylated. The average bulk density of material in Mons Hansteen is extremely low, been equal only to 1500–2000 kg/m3.The Bulk Density of the Small Lunar Volcanos Gruithuisen Delta and Hansteen Alpha: Implications for Volcano Composition and Petrogenesis
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See also

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Volcanism on the Moon Volcanism on the Moon is represented by the presence of volcanoes, pyroclastic deposits and vast lava plains on the lunar surface. The volcanoes are typically in the form of small domes and cones that form large volcanic complexes and isolated edi ...


References


External links


Mons Hansteen: A Window into Lunar Magmatic Processes
Lunar Reconnaissance Orbiter The Lunar Reconnaissance Orbiter (LRO) is a NASA robotic spacecraft currently orbiting the Moon in an eccentric polar mapping orbit. Data collected by LRO have been described as essential for planning NASA's future human and robotic missions t ...
Camera (LROC) article, Posted by Brett Denevi on April 10, 2017 Hansteen Hansteen Hansteen {{Moon-stub