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Letters. Natural occurrence of Fe2SiO4 -spinel in the shocked Umbarger L6 chondrite
-
Zhidong Xie
,
Naotaka Tomioka
Published/Copyright:
March 28, 2015
Abstract
Here we report the first natural occurrence of Fe2SiO4-spinel in a shock-induced melt pocket of the Umbarger L6 chondrite. Optical microscopy, scanning electron microscopy, electron microprobe analysis, and analytical transmission electron microscopy were used to examine the sample. Fe2SiO4- spinel was identified by TEM using selected-area electron diffraction and energy-dispersive X-ray spectroscopy. The symmetry of the diffraction patterns, the ratios of d-spacings, and interplanar angles are consistent with the spinel structure. However, the cell parameter of Fe2SiO4-spinel (8.52 Å), calculated from d-spacing data, is 3.5% larger than that of synthetic Fe2SiO4-spinel (8.235 Å). Chemical analyses of the spinel show olivine stoichiometry with Fe/(Fe + Mg) ratios ranging from 0.62 to 0.99. Fe2SiO4-spinel and stishovite occur within FeO-SiO2-rich zones in the melt pocket, surrounded by SiO2-rich glass and Fe-rich phyllosilicates. Fe2SiO4-spinel plus stishovite also occur with other high-pressure minerals in the melt pocket: ringwoodite, akimotoite, augite, and hollanditestructured plagioclase. We infer that the Fe2SiO4-spinel crystallized from a zone of FeO-SiO2-rich melt within the shock-induced melt pocket. Two models for FeO-SiO2-rich melt are discussed: it was either a residual melt after crystallization of MgO-rich silicates in a chondritic melt pocket, or it was produced by shock melting of FeO-SiO2-rich material.
Received: 2002-3-11
Accepted: 2002-4-23
Published Online: 2015-3-28
Published in Print: 2002-8-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Evidence for magmatic vapor deposition of anhydrite prior to the 1991 climactic eruption of Mount Pinatubo, Philippines
- Experimental and modeled solubilities of chlorine in aluminosilicate melts, consequences of magma evolution, and implications for exsolution of hydrous chloride melt at Mt. Somma-Vesuvius
- Temperature-induced Al -zoning in hornblendes of the Fish Canyon magma, Colorado
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