New findings for the equilibrated enstatite chondrite Grein 002

Andrea Patzer, Jochen Schlüter, Ludolf Schultz, Mahmud Tarkian, Dolores H. Hill, William V. Boynton

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We report new petrographic and chemical data for the equilibrated EL chondrite Grein 002, including the occurrence of osbornite, metallic copper, abundant taenite, and abundant diopside. As inferred from low Si concentrations in kamacite, the presence of ferroan alabandite, textural deformation, chemical equilibration of mafic silicates, and a subsolar noble gas component, we concur with Grein 002's previous classification as an EL4-5 chondrite. Furthermore, the existence of pockets consisting of relatively coarse, euhedral enstatite crystals protruding large patches of Fe-Ni alloys suggests to us that this EL4-5 chondrite has been locally melted. We suspect impact induced shock to have triggered the formation of the melt pockets. Mineralogical evidence indicates that the localized melting of metal and adjacent enstatite must have happened relatively late in the meteorite's history. The deformation of chondrules, equilibration of mafic silicates, and generation of normal zoning in Fe, Zn-sulfides took place during thermal alteration before the melting event. Following parent body metamorphism, daubreelite was exsolved from troilite in response to a period of slow cooling at subsolidus temperatures. Exsolution of schreibersite from the coarse metal patches probably occurred during a similar period of slow cooling subsequent to the event that induced the formation of the melt pockets. Overall shock features other than localized melting correspond to stage S2 and were likely established by the final impact that excavated the Grein 002 meteoroid.

Original languageEnglish (US)
Pages (from-to)1555-1575
Number of pages21
JournalMeteoritics and Planetary Science
Volume39
Issue number9
StatePublished - Sep 2004

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enstatite chondrite
enstatite
chondrites
chondrite
melting
silicates
schreibersite
silicate
shock
kamacite
melt
taenite
troilite
cooling
thermal alteration
chondrule
noble gas
metal
parent body
exsolution

ASJC Scopus subject areas

  • Geophysics

Cite this

Patzer, A., Schlüter, J., Schultz, L., Tarkian, M., Hill, D. H., & Boynton, W. V. (2004). New findings for the equilibrated enstatite chondrite Grein 002. Meteoritics and Planetary Science, 39(9), 1555-1575.

New findings for the equilibrated enstatite chondrite Grein 002. / Patzer, Andrea; Schlüter, Jochen; Schultz, Ludolf; Tarkian, Mahmud; Hill, Dolores H.; Boynton, William V.

In: Meteoritics and Planetary Science, Vol. 39, No. 9, 09.2004, p. 1555-1575.

Research output: Contribution to journalArticle

Patzer, A, Schlüter, J, Schultz, L, Tarkian, M, Hill, DH & Boynton, WV 2004, 'New findings for the equilibrated enstatite chondrite Grein 002', Meteoritics and Planetary Science, vol. 39, no. 9, pp. 1555-1575.
Patzer A, Schlüter J, Schultz L, Tarkian M, Hill DH, Boynton WV. New findings for the equilibrated enstatite chondrite Grein 002. Meteoritics and Planetary Science. 2004 Sep;39(9):1555-1575.
Patzer, Andrea ; Schlüter, Jochen ; Schultz, Ludolf ; Tarkian, Mahmud ; Hill, Dolores H. ; Boynton, William V. / New findings for the equilibrated enstatite chondrite Grein 002. In: Meteoritics and Planetary Science. 2004 ; Vol. 39, No. 9. pp. 1555-1575.
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