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Post Info TOPIC: Compton-Belkovich Volcanic Complex


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Extent of Moon's giant volcanic eruption is revealed

A team of astronomers and geologists, led by experts in the Institute for Computational Cosmology and Department of Earth Sciences at Durham University, UK, studied an area of the lunar surface in the Compton-Belkovich Volcanic Complex.
By mapping the radioactive element thorium which spewed out during the eruption they discovered that, with the help of the Moon's low gravity, debris from the unnamed volcano was able to cover an area the size of Scotland, or around 70,000kmē.

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Title: Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex
Author: J. T. Wilson (1), V. R. Eke (1), R. J. Massey (1), R. C. Elphic (2), B. L. Jolliff (3), D. J. Lawrence (4), E. W. Llewellin (1), J. N. McElwaine (1), L. F. A. Teodoro (2) ((1) Durham University, (2) NASA Ames, (3) WUSTL, (4) JHU-APL)

We reconstruct the abundance of thorium near the Compton-Belkovich Volcanic Complex on the Moon, using data from the Lunar Prospector Gamma Ray Spectrometer. We enhance the resolution via a pixon image reconstruction technique, and find that the thorium is distributed over a larger (40 km x 75 km) area than the (25 km x 35 km) high albedo region normally associated with Compton-Belkovich. Our reconstructions show that inside this region, the thorium concentration is 15 - 33 ppm. We also find additional thorium, spread up to 300 km eastward of the complex at ~2 ppm. The thorium must have been deposited during the formation of the volcanic complex, because subsequent lateral transport mechanisms, such as small impacts, are unable to move sufficient material. The morphology of the feature is consistent with pyroclastic dispersal and we conclude that the present distribution of thorium was likely created by the explosive eruption of silicic magma.

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