Hydrogen isotope ratios in lunar rocks indicate delivery of cometary water to the Moon Greenwood, James P., et al. Presented by Patrick Harner.

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Presentation transcript:

Hydrogen isotope ratios in lunar rocks indicate delivery of cometary water to the Moon Greenwood, James P., et al. Presented by Patrick Harner

Deuterium/Hydrogen δD = {[(D/H) sample /(D/H) VSMOW ] – 1} x 1,000 Terrestrial water δD range from ~-500‰ to ~+100‰; mean ocean value of O‰ Terrestrial mantle δD of ~-100‰ Solar system δD range -1,000‰ to >+100,000‰

Lunar Samples apod.nasa.gov Analyzed Apatite (Ca 5 (PO 4 ) 3 (F, Cl, OH)) Mare basalt apatite associated with late-stage crystallization features Apatite grain fragments from late-stage matrix of two breccia One apatite grain from a high phosphate intrusive alkali anorthosite clast

Methods Lunar samples, fresh thin sections Light microscopy and electron imaging Ion microscope analysis: SIMS, SCAPS Quantitative electron microprobe analysis

Mare Basalts Apatite enriched in H compared to surrounding minerals Water content in mare basalt apatite grains range from 0 to 6,050 ppm Similar water content from basalts from separate landing sites with different ages

Water Content Plagioclase represent non-hydrous background One low-water mare basalt sample; slowly cooled, extensive degassing Highland alkali anorthosite clast apatite grain show 80 ± 10 ppm; predate mare basalt volcanism

Isotopic Variability δD range from +391‰ to +1,010‰ Variability of δD within individual grains Homogenous H 2 O% No strong correlation with cosmic-ray exposure Zonation of minor elements

Possible Explanations Earth-Moon system was able to diffusively equilibrate its volatiles after Moon-forming impact; fractionation caused by hydrodynamic escape of hydrogen during formation Addition of cometary water to an early Moon that inherited its δD from Earth’s mantle Assimilation of lunar regolith enriched in water from impact

References Boyce, J. W., et al., Nature 466, (2010) Greenwood, James P., et al., Geophys. Res. Lett. 35, L05203 (2008) Greenwood, James P., et al., Nature 1050, (2011) Sakamoto, N., et al., 72 Annual Meteoritical Society Meeting (2009) Taylor, L. A., et al., Am. Mineral 89, (2004)