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Pyroxene Homogenization and the Isotopic Systematics of EucritesThe original Mg-Fe zoning of eucritic pyroxenes has in nearly all cases been partly homogenized, an observation that has been combined with other petrographic and compositional criteria to establish a scale of thermal "metamorphism" for eucrites. To evaluate hypotheses explaining development of conditions on the HED parent body (Vesta?) leading to pyroxene homogenization against their chronological implications, it is necessary to know whether pyroxene metamorphism was recorded in the isotopic systems. However, identifying the effects of the thermal metamorphism with specific effects in the isotopic systems has been difficult, due in part to a lack of correlated isotopic and mineralogical studies of the same eucrites. Furthermore, isotopic studies often place high demands on analytical capabilities, resulting in slow growth of the isotopic database. Additionally, some isotopic systems would not respond in a direct and sensitive way to pyroxene homogenization. Nevertheless, sufficient data exist to generalize some observations, and to identify directions of potentially fruitful investigations.
Document ID
Document Type
Conference Paper
Nyquist, L. E.
(NASA Johnson Space Center Houston, TX United States)
Bogard, D. D.
(NASA Johnson Space Center Houston, TX United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1996
Publication Information
Publication: Workshop on Evolution of Igneous Asteroids: Focus on Vesta and the HED Meterorites
Issue: Pt. 1
Subject Category
Distribution Limits
Work of the US Gov. Public Use Permitted.

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