Eagle Station grouplet

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Eagle Station grouplet
— Grouplet —
Eagle Station pallasite, Mineralogisches Museum, Bonn.jpg
Eagle Station meteorite, type specimen for the grouplet.
Type Stony-iron
Class Pallasite
Composition Meteoric iron, silicates
Total known specimens 4

The Eagle Station grouplet (abbreviated PES - Pallasite Eagle Station) is a set of pallasite meteorite specimen that don't fit into any of the defined pallasite groups. In meteorite classification five meteorites have to be found, so they can be defined as their own group.[1] Currently only four Eagle Station type meteorites have been found.[2]

Naming and history[edit]

The Eagle Station grouplet is named after the Eagle Station meteorite, the type specimen of the grouplet. It is in turned named after Eagle Station, Carroll County Kentucky where it was found.[3]

Description[edit]

The Eagle Station grouplet has a composition similar to Main group pallasites. Diagnostic differences are that the olivine is richer in iron and calcium. The grouplet also has a distinct oxygen isotope signature.[1]

The meteoric iron is similar to the IIF iron meteorites. This might indicate that Eagle station grouplet and IIF formed close to each other in the solar nebula.[1]

Parent body[edit]

The trace elements in the phosphates of the Eagle Station grouplet are distinct to other pallasites. Most pallasites are believed to be derived from the core-mantle boundary. Trace elements indicate that the Eagle Station grouplet came from shallower depths of their parent body.[4]

Notable specimen[edit]

Only four specimen have been found so far:[2]

See also[edit]

References[edit]

  1. ^ a b c D.S. Lauretta, H.Y. McSween, Jr., editors ; foreword by Richard P. Binze; M. K. Weisberg; T. J. McCoy, A. N. Krot (2006). "Systematics and Evaluation of Meteorite Classification". Meteorites and the early solar system II. Tucson: University of Arizona Press. pp. 19–52. ISBN 978-0816525621. Retrieved 15 December 2012. 
  2. ^ a b "Meteoritical Bulletin Database". Meteoritical Society. 
  3. ^ "Eagle Station". Meteoritical Society. 
  4. ^ Davis, Andrew M.; Olsen, Edward J. (17 October 1991). "Phosphates in pallasite meteorites as probes of mantle processes in small planetary bodies". Nature 353 (6345): 637–640. doi:10.1038/353637a0.