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The Mineralogy and Petrology of Anomalous Eucrite EmmavilleIt has long been known that certain basaltic achondrites share similarities with eucrites. These eucrite-like achondrites have distinct isotopic compositions and petrologic characteristics indicative of formation on a separate parent body from the howardite-eucrite-diogenite (HED) clan (e.g., Ibitira, Northwest Africa (NWA) 011). Others show smaller isotopic variations but are otherwise petrologically and compositionally indistinguishable from basaltic eucrites (e.g., Pasamonte, Pecora Escarpment (PCA) 91007). The Emmaville eucrite has a delta O-17 value of -0.137 plus or minus 0.024 per mille (1 sigma), which is substantially different from the eucrite mean of -0.246 plus or minus 0.014 per mille (2 sigma), but similar to those of A-881394 and Bunburra Rockhole (BR). Currently little data exist for Emmaville in terms of petrology or bulk composition. Studying anomalous eucrites allows us to more completely understand the numbers of asteroids represented by eucrite- like basalts and thus constrain the heterogeneity of the HED suite. In this study, we present our preliminary petrological and mineral composition results for Emmaville.
Document ID
20150001908
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Barrett, T. J. (Open Univ. Milton Keynes, United Kingdom)
Mittlefehldt, D. W. (NASA Johnson Space Center Houston, TX, United States)
Ross, D. K. (Jacobs Technology, Inc. Houston, TX, United States)
Greenwood, R. C. (Open Univ. Milton Keynes, United Kingdom)
Anand, M. (Open Univ. Milton Keynes, United Kingdom)
Franchi, I. A. (Open Univ. Milton Keynes, United Kingdom)
Grady, M. M. (Open Univ. Milton Keynes, United Kingdom)
Charlier, B. L. A. (Open Univ. Milton Keynes, United Kingdom)
Date Acquired
February 23, 2015
Publication Date
March 16, 2015
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
JSC-CN-32741
Meeting Information
Meeting: Lunar and Planetary Science Conference
Location: The Woodlands, TX
Country: United States
Start Date: March 16, 2015
End Date: March 20, 2015
Sponsors: Universities Space Research Association, NASA Johnson Space Center, Lunar and Planetary Inst.
Funding Number(s)
CONTRACT_GRANT: ST/1001964/1
Distribution Limits
Public
Copyright
Public Use Permitted.

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