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Na behaviour in shock-induced melt phase of the Yanzhuang (H6) chondrite

Chen Ming and Xie Xiande
Na behaviour in shock-induced melt phase of the Yanzhuang (H6) chondrite
European Journal of Mineralogy (April 1996) 8 (2): 325-333


The Yanzhuang meteorite was severely shocked and reheated in an extraterrestrial impact event; it contains four shock facies characteristic of disequilibrium shock effects. The volatile element Na is not unequivocally depleted in the shock-induced melt phase. This preservation of Na could correspond with high shock P (> or = 30 GPa) and high post-shock T that acted in most parts of this meteorite, resulting in reduced rock porosity and lower P and T gradients between the melt phase and the surrounding shock facies and quenching of the melt phase (6-400 degrees C/s). Na redistribution in the melt phase is shown: 1) Na concentrated into Fe-Ni-S melt at high T and P; Fe-Mn-Na phosphate (possibly a new phase) was formed in the metal-troilite eutectic nodules. 2) Minor amounts of Na were solidified into the recrystallized low-Ca pyroxene, resulting in a slightly enhanced Na content in the pyroxene. 3) Part of the Na was 'frozen' into the silicate melt glass.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 8
Serial Issue: 2
Title: Na behaviour in shock-induced melt phase of the Yanzhuang (H6) chondrite
Author(s): Chen MingXie Xiande
Affiliation: Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
Pages: 325-333
Published: 199604
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 19
Accession Number: 1996-044105
Categories: Petrology of meteorites and tektites
Document Type: Serial
Bibliographic Level: Analytic
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199615
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