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Related Experiment Video

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Atom Probe Tomography Analysis of Exsolved Mineral Phases
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The lunar apatite paradox.

J W Boyce1, S M Tomlinson, F M McCubbin

  • 1Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, Los Angeles, CA 90095, USA.

Science (New York, N.Y.)
|March 22, 2014
PubMed
Summary
This summary is machine-generated.

Discoveries of water-rich lunar apatite challenge existing models. This study explains their formation through low magmatic fluorine, suggesting lunar magmas were hydrogen-poor, aligning with volatile depletion theories.

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Area of Science:

  • Lunar geology
  • Geochemistry
  • Petrology

Background:

  • Recent lunar apatite discoveries suggest higher water content than expected.
  • This contradicts the generally volatile-depleted nature of lunar rocks.

Purpose of the Study:

  • To investigate the formation mechanisms of hydrous lunar apatite.
  • To reconcile the presence of H-rich minerals in nearly anhydrous lunar rocks.

Main Methods:

  • Literature data modeling.
  • Analysis of hydrogen (H), fluorine (F), and chlorine (Cl) fractionation in magmas.

Main Results:

  • Nominally anhydrous minerals do not sufficiently fractionate H from F and Cl.
  • Apatite-induced low magmatic fluorine increases the H/F ratio in melt and apatite.
  • Hydrous apatites are explained as products of low fluorine.

Conclusions:

  • Lunar magmas were likely poor in hydrogen.
  • Findings align with observed volatile depletion in lunar rocks.
  • This supports giant-impact models for Moon formation.