Journal
GEOCHEMISTRY
Volume 79, Issue 4, Pages -Publisher
ELSEVIER GMBH
DOI: 10.1016/j.chemer.2019.125541
Keywords
Vestaite; Corundum; Kyanite; Shock-induced melt pockets; Eucrite
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Funding
- National Science Foundation of China [41673068]
- Natural Science Foundation of Jiangsu Province of China [BK20170017]
- Gottfried Wilhelm Leibniz program of the Deutsche Forschungsgemeinschaft [LA830/14-1]
- Program B for Outstanding PhD Candidates of Nanjing University [201802B078]
- China Scholarship Council
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Shock-induced Ti-rich melt pockets in a basaltic eucrite Northwest Africa (NWA) 8003 were studied using scanning and transmission electron microscopy. Unique mineral assemblages consisting of clinopyroxene, ilmenite, vestaite, corundum, and kyanite are observed. Among them, vestaite and corundum in NWA 8003 are first reported to occur in eucrite meteorites. Petrographic and chemical evidences indicate that the Ti-rich melt pockets have formed by in-situ melting of ilmenite, plagioclase, pyroxene, and possibly minor silica and apatite nearby. The temperature rise and melting were caused by the high shock impedance contrast at interfaces between ilmenite and other phases with a distinctly lower density. Crystallization pressure, temperature and cooling time of the Ti-rich melt pockets in NWA 8003 are constrained to be (similar to)0.9-(similar to)10 GPa, (similar to)1300-(similar to)1730 degrees C, and < 1 ms (5-50 mu m in size), respectively.
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