Ryan A. Zeigler

Research Scientist
Ph.D., Washington University, 2005

Dr. Zeigler’s research interests involve determining the petrographic and geochemical characteristics of lunar samples, including both Apollo samples and lunar meteorites. He specializes in:

•  The petrographic characterization of lunar samples using optical microscopy and the electron microprobe
  
  
•  Geochemical characterization of lunar samples using instrumental neutron activation analysis (trace-elements) and fused bead electron microprobe analysis (major element)
  
  
•  Petrologic modeling using the Magpox and Magfox programs of John Longhi.
  

Drs. Korotev and Zeigler in the lunar sample curation laboratory at the NASA Johnson Space Center in Houston. Photo by Linda Watts.

Korotev R. L., Zeigler R. A., and Jolliff B. L. (2006) Feldspathic lunar meteorites Pecora Escarpment 02007 and Dhofar 489: Contamination of the surface of the lunar highlands by post-basin impacts. Geochimica et Cosmochimica Acta 70, 5935-5956.

Barra F., Swindle T. D., Korotev R. L., Jolliff B. L., Zeigler R. A., and Olson E. (2006) ⁴⁰Ar-³⁹Ar dating on Apollo 12 regolith: Implications on the age of Copernicus and the source of non-mare materials. Geochimica et Cosmochimica Acta 70, 6016-6031.

Zeigler R. A., Korotev R. L., Jolliff B. L., L Haskin. A., and Floss C. (2006) The geochemistry and provenance of Apollo 16 mafic glasses. Geochimica et Cosmochimica Acta 70, 6050-6067.

Jolliff B. L. J. M. Hughes, J. J. Freeman., and R. A. Zeigler (2006) Crystal chemistry of lunar merrillite and comparison to other meteoritic and planetary suites of whitlockite and merrillite. American Mineralogist 91, 1583-1595 (2006).

Zeigler R. A., Korotev R. L., Haskin L. A., Jolliff B. L., and Gillis J. J. (2006) Petrology and geochemistry of five new Apollo 16 mare basalts and evidence for post-basin deposition of basaltic material at the site. Meteoritics & Planetary Science 41, 263-284.

Zeigler R. A., Korotev R. L., Jolliff B. L., and Haskin L. A. (2005) Petrology and geochemistry of the LaPaz icefield basaltic lunar meteorite and source-crater pairing with Northwest Africa 032. Meteoritics & Planetary Science 40, 1073–1102.

Korotev R. L., Jolliff B. L., Zeigler R. A., Gillis J. J., and Haskin L. A. (2003) Feldspathic lunar meteorites and their implications for compositional remote sensing of the lunar surface and the composition of the lunar crust. Geochimica et Cosmochimica Acta 67, 4895-4923.

Jolliff B. L., Korotev R. L., Zeigler R. A., Floss C., and Haskin L. A. (2003) Northwest Africa 773: Lunar mare breccia with a shallow-formed olivine-cumulate component, very-low-Ti (VLT) heritage, and a KREEP connection. Geochimica et Cosmochimica Acta 67, 4857–4879.

Korotev R. L., Jolliff B. L., Zeigler R. A., and Haskin L. A. (2003) Compositional constraints on the launch pairing of three brecciated lunar meteorites of basaltic composition. Antarctic Meteorite Research 16, 152-175, Nat. Inst. Polar Res., Tokyo.

recent abstracts by the Planetary Materials Research Group

314-935-4376	zeigler@levee.wustl.edu
314-935-7361