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U-Pb Dating of Zircons and Phosphates in Lunar Meteorites, Acapulcoites and AngritesZircon U-Pb geochronology has made a great contribution to the timing of magmatism in the early Solar System [1-3]. Ca phosphates are another group of common accessory minerals in meteorites with great potential for U-Pb geochronology. Compared to zircons, the lower closure temperatures of the U-Pb system for apatite and merrillite (the most common phosphates in achondrites) makes them susceptible to resetting during thermal metamorphism. The different closure temperatures of the U-Pb system for zircon and apatite provide us an opportunity to discover the evolutionary history of meteoritic parent bodies, such as the crystallization ages of magmatism, as well as later impact events and thermal metamorphism. We have developed techniques using the Cameca IMS-1280 ion microprobe to date both zircon and phosphate grains in meteorites. Here we report U-Pb dating results for zircons and phosphates from lunar meteorites Dhofar 1442 and SaU 169. To test and verify the reliability of the newly developed phosphate dating technique, two additional meteorites, Acapulco, obtained from Acapulco consortium, and angrite NWA 4590 were also selected for this study as both have precisely known phosphate U-Pb ages by TIMS [4,5]. Both meteorites are from very fast cooled parent bodies with no sign of resetting [4,5], satisfying a necessity for precise dating.
Document ID
20120001849
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Zhou, Q. (Academia Sinica Beijing, China)
Zeigler, R. A. (NASA Johnson Space Center Houston, TX, United States)
Yin, Q. Z. (California Univ. Davis, CA, United States)
Korotev, R. L. (Washington Univ. Saint Louis, MO, United States)
Joliff, B. L. (Washington Univ. Saint Louis, MO, United States)
Amelin, Y. (Australian National Univ. Canberra, Australia)
Marti, K. (California Univ., San Diego La Jolla, CA, United States)
Wu, F. Y. (Academia Sinica Beijing, China)
Li, X. H. (Academia Sinica Beijing, China)
Li, Q. L. (Academia Sinica Beijing, China)
Lin, Y. T. (Academia Sinica Beijing, China)
Liu, Y. (Academia Sinica Beijing, China)
Tang, G. Q. (Academia Sinica Beijing, China)
Date Acquired
August 25, 2013
Publication Date
January 1, 2012
Subject Category
Geophysics
Report/Patent Number
JSC-CN-25671
Meeting Information
Meeting: 43rd Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 19, 2012
End Date: March 23, 2012
Sponsors: Lunar and Planetary Inst.
Distribution Limits
Public
Copyright
Public Use Permitted.

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