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Peckelsheim meteorite, Peckelsheim, North Rhine-Westphalia, Germany

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Name(s) in local language(s): Meteorit von Peckelsheim, Peckelsheim, Nordrhein-Westfalen, Deutschland
 
Diogenite, polymict
Fell 3 Mar 1953, 117.8 g, 1 stone

A loud whine was heard just before a small meteorite struck a tree bough and fell at the ??? of some workers. The small stone was only the eighth of a total of 11 witnessed diogenite falls. All 11 diogenite falls have been plutonic pyroxenites consisting of ~90% orthopyroxene with somewhat different brecciation and partial re-equilibration histories. And they have been invariably accompanied by a number of minor silicates and opaques. Peckelsheim's various silicates include clinopyroxenes, tridymite, olivine, and two varieties of plagioclase (anorthite and bytownite). Reported opaques include chromite, ilmenite, copper, pentlandite, schreibersite, chalcopyrite, troilite as well as Fe-Ni metal. It is unclear whether the number of reported opaques reported for Peckelsheim represent a greater variety than present in other Diogenites or whether our knowledge of opaques has been enhanced because Peckelsheim was very carefully studied by a maestro of ore mineralogy, Paul Ramdohr. Ramdohr was a master of reflected light oil-immersion microscopy, a procedure which under a master eye readily reveals the mineralogical identity of the ubiquitous unidentified 'sulfides' reported in many electron microscopy studies. Peckelsheim also contains some unusual Fe-Ni metal assemblages. Kamacite, sometimes Ni-poor, sometimes Co-rich and sometimes accompanied by Taenite is reported by several groups. Metal with Ni > 50 wt% - most or all of it Tetrataenite - is also reported.

The orthopyroxenite Diogenite meteorites and a few other more olivine-rich Diogenite finds are all part of the HED achondrite suite(Howardite-Eucrite-Diogenite) of differentiated meteorites which are derived from an unknown number of large asteroidal parent bodies. The recent DAWN mission with its detailed mapping of the surface of asteroid 4 Vesta has made it quite clear that Vesta is almost certainly the parent body of the great majority of HED meteorites. Simultaneously, however, asteroidal observations of unusual more distant asteroids, detailed analysis of Mn/Fe and REE ratios and, especially, new high-resolution studies of O-isotope ratios make it even clearer that all HED meteorites did not originate on the same homeworlds. It will still take some time before we can confidentially assert that a specific Diogenite (such as Peckelsheim) originated on Venus in the manner that contemporary archaeologists can assert that such an Etruscan or Egyptian bracelet was forged from Cyprus copper. But, we are on our way.

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References

Ramdohr, P. & A. El Goresy (1969) "Peckelsheim" a new bronzite achondrite from Westfalia, Germany (Abst.). Meteoritics 4 (4): 291. (Dec 1969)

Moore, C. (1970) Meteoritical Bulletin, No. 36-48. Meteoritics 5(2): 85-109. (June 1970)

Ramdohr, P. (1973). The Opaque Minerals in Stony Meteorites. Elsevier Publishing Company: Amsterdam; London: New York. 245 pages.

Gooley, R. & Moore, C. B. ( 1976) Native metal in diogenite meteorites: American Mineralogist 61 (5/6, Part I): 373-378. (May-June 1976)

Rubin, A. E. (1997) Mineralogy of meteorite groups. Meteoritics & Planetary Science 32 (2): 231-247. (Mar 1997)

Bowman, L. E., Spilde, M. N. & Papike, P. P. (1997) Automated dispersive spectrometer modal analysis applied to diogenites. Meteoritics & Planetary Science 32 (6): 869-875. (Nov 1997)

Mittlefehldt, D. W., McCoy, T. J., Goodrich, C. A. & Kracher, A. (1998). Non-chondritic meteorites from asteroidal bodies. In: Planetary Materials (Papike, J. J., Editor): Chapter 4, 195 pages. Mineralogical Society of America: Washington, DC, USA. (1998)

Bowman, L. E., Papike, J. J. & Spilde, M. N. (1999) Diogenites as asteroidal cumulates: Insights from spinel chemistry: American Mineralogist: 84 (7-8): 1020–1026. (July-August 1999)

Grady, M. M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge, New York, Oakleigh, Madrid, Cape Town. 690 pages.

Lazzaro, D. et al. (2000) Discovery of a Basaltic Asteroid in the Outer Main Belt. Science 288, 2033-2035.

Scott, E.R.D., Greenwood, R.C., Franchi, I.A. & Sanders, I.S. (2009) Oxygen isotopic constraints on the origin and parent bodies of eucrites, diogenites, and howardites. Geochimica et Cosmochimica Acta73 (19): 5835-5853. (Oct 2009)

McSween, H. Y. Jr. & 11 others (1913). Dawn, the Vesta-HED connection; and the Geological context for eucrites, diogenites, and howardites. Meteoritics & Planetary Science 48 (13): 2090-2104. (Nov 2013)

External Links

http://www.lpi.usra.edu/meteor/metbull.php = Meteoritical Bulletin Database

 
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