Evidence for multiple dynamic events and subsequent decompression stage recorded in a shock vein

Details Evidence for multiple dynamic events and subsequent decompression stage recorded in a shock vein Evidence for multiple dynamic events and subsequent decompression stage recorded in a shock vein

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011e%26psl.307..361m&link_type=abstract

Earth and Planetary Science Letters, Volume 307, Issue 3-4, p. 361-368.

Computer Science

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Scientific paper

We investigated a shock vein of the Yamato 791384 L6 chondrite to clarify the nature and sequence of the dynamic processes that resulted from the shock events. The chondritic host-rock of Y-791384 mainly consists of olivine (Fa24-25), low-Ca pyroxene (Fs18-22), albitic feldspar (An9-10Ab84-86Or5-7), troilite and metallic Fe-Ni. The shock vein contains majorite (or majorite-pyropess) and magnesiowüstite (+ minor jadeite) as high-pressure polymorphs. Two different dynamic events were recorded in the shock vein. The majorite grain contained vitrified (Mg,Fe)SiO3-perovskite inclusions. The (Mg,Fe)SiO3-perovskite was crystallized from a chondritic melt, and is a remnant of a first dynamic event. The majorite and magnesiowüstite were also crystallized directly from a chondritic melt but induced by a second dynamic event. The pressure condition for the first and second dynamic events would be >~24 GPa and <~22 GPa, respectively. Pervasive feather-shaped olivine (Fa16) nucleated on the magnesiowüstite and majorite. This feather-shaped olivine is evidence for rapidly grown olivine from the melt related to the shock event. Phase relations deduced from high-pressure melting experiments of the Allende meteorite and peridotite indicate that the magnesiowüstite and majorite + olivine pair cannot coexist at equilibrium condition. The disequilibrium assemblage reflects a decompression stage. These features demonstrate the complexity of events during a natural dynamic process.

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