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Early Petrogenesis and Late Impact(?) Metamorphism on the GRA 06128/9 Parent BodyInitial studies of GRA06128 and GRA06129 (hereafter GRA 8 and GRA 9) suggested that these alkalic meteorites represent partial melts of a parent body of approximately chondritic composition. A SM-147-Nd-143 isochron age of 4.545 +/- 0.087 Ga was found for GRA 8, but plagioclase (oligoclase) plus whole rock and leachate samples gave an apparent secondary age of approximately 3.5 Ga. The approximately 4.54 Ga age was interpreted to be the crystallization age of GRA 8; the approximately 3.5 Ga as an upper limit to a time of metamorphism. Here we extend Sm-Nd and Rb-Sr analyses to GRA 9.
Document ID
20090006826
Acquisition Source
Johnson Space Center
Document Type
Extended Abstract
Authors
Nyquist, Laurence E. (NASA Johnson Space Center Houston, TX, United States)
Shih, C.-Y. (Jacobs Technologies Engineering Science Contract Group Houston, TX, United States)
Reese, Y. D. (Muniz Engineering, Inc. Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Subject Category
Lunar And Planetary Science And Exploration
Meeting Information
Meeting: 40th Lunar Planetary Conference
Location: Houston, TX
Country: United States
Start Date: March 23, 2009
End Date: March 27, 2009
Distribution Limits
Public
Copyright
Public Use Permitted.

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