U-Pb geochronology of zircons form lunar Breccia 73217 using a sensitive high mass-resolution ion microprobe

Details U-Pb geochronology of zircons form lunar Breccia 73217 using a sensitive high mass-resolution ion microprobe U-Pb geochronology of zircons form lunar Breccia 73217 using a sensitive high mass-resolution ion microprobe

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984lpsc...14..525c&link_type=abstract

(American Geophysical Union and NASA, Lunar and Planetary Science Conference, 14th, Houston, TX, Mar. 14-18, 1983) Journal of Ge

Physics

15

Breccia, Geochronology, Lunar Rocks, Petrology, Radioactive Age Determination, Refractory Materials, High Resolution, Ion Probes, Lead Isotopes, Uranium Isotopes, Moon, Samples, Lunar, Uranium, Lead, Geochronology, Zircons, Breccias, Apollo 17, 73217, Composition, Ion Microprobe, Shrimp, Crystals, Ages, Radiogenic Elements, Dating Techniques, Evolution, Source, Formation, Clasts, Optical Properties, Chemistry, Zoning, Enrichment

Scientific paper

U-Pb age determinations on four lunar zircons from existing thin-sections of one highland breccia, 73217, using the recently constructed ion microprobe SHRIMP, are reported. The analytical reproducibility of SHRIMP is demonstrated, and procedures for measuring Pb/U, Th/U, and corecting for initial Pb are explained. Electron microprobe analyses for the zircons are also are reported. The results show that the four zircons survived the lunar cataclysm without any identifiable effects on their U-Pb systematics. All four indicate a single age of 4356 +23 or -14 m.y. The zircons have experienced small variable amounts of Pb loss since crystallization, from almost zero up to about 10 percent. If this occurred during one later event, then age of the latter is between 1100 and 2300 m.y.

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