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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
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Published on: November 15, 2013

Nominally hydrous magmatism on the Moon.

Francis M McCubbin1, Andrew Steele, Erik H Hauri

  • 1Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road, N.W., Washington, DC 20015, USA. fmccubbin@ciw.edu

Proceedings of the National Academy of Sciences of the United States of America
|June 16, 2010
PubMed
Summary

Indigenous water is abundant in the Moon's interior, challenging previous beliefs. Analysis of lunar apatite reveals significant hydroxyl content, suggesting water is widespread and potentially present since lunar formation.

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Area of Science:

  • Lunar science
  • Geochemistry
  • Planetary science

Background:

  • The Moon was historically considered nearly devoid of indigenous water.
  • Recent evidence suggests the presence of water on the lunar surface and interior.
  • This challenges the long-standing scientific dogma about lunar hydration.

Purpose of the Study:

  • To quantitatively assess the abundance of water within the lunar interior.
  • To investigate the indigenous nature of lunar water.
  • To constrain water content in lunar source regions.

Main Methods:

  • Secondary Ion Mass Spectrometry (SIMS) was used for analysis.
  • Hydroxyl, fluoride, and chloride were analyzed in apatite samples.
  • Three diverse lunar samples were studied to obtain quantitative constraints.

Main Results:

  • Hundreds to thousands of parts per million (ppm) of water, in the form of hydroxyl, were confirmed in lunar apatite.
  • Two samples showed evidence of magmatic water, indicating indigenous lunar water.
  • Hydroxyl presence in various lunar rock types suggests water may be ubiquitous in the lunar interior.

Conclusions:

  • The Moon's interior contains significant amounts of indigenous water.
  • Water may have been present since the Moon's formation, potentially ubiquitous.
  • Minimum water content in lunar source regions is significantly higher than previously estimated.