The majorite-pyrope + magnesiowüstite assemblage: Constraints on the history of shock veins in chondrites

Ming Chen, Thomas G. Sharp, Ahmed El Goresy, Brigitte Wopenka, Xiande Xie

Research output: Contribution to journalArticle

173 Scopus citations

Abstract

Shock veins in the Sixiangkou (L6) chondrite contain two high-pressure assemblages: (i) majorite-pyrope solid solution plus magnesiowüstite that crystallized at high pressures and temperatures from a shock-induced silicate melt of bulk Sixiangkou composition and (ii) ringwoodite plus low-calcium majorite that were produced by solid-state transformation of olivine and low-calcium pyroxene. The morphology and chemistry of the majoritepyrope garnet and the size of the magnesiowüstite crystals indicate a longer duration at high pressure and temperature than predicted by impact scenarios. This pressure-temperature regime is constrained by the olivine-ringwoodite and orthopyroxene-majorite phase transformations, fusion of the meteorite constituents, and crystallization of majorite-pyrope solid solution plus magnesiowüstite from that melt under high pressure.

Original languageEnglish (US)
Pages (from-to)1570-1573
Number of pages4
JournalScience
Volume271
Issue number5255
DOIs
StatePublished - Mar 15 1996
Externally publishedYes

ASJC Scopus subject areas

  • General

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