FeO-rich silicates and Ca, Al-rich inclusions in Qingzhen and Yamato 691 (EH3) meteorites: Evidence for migration of mass in the solar nebula |
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Authors: | Yangting Lin Ziyuan Ouyang A El Goresy |
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Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China;(2) Institute of Geochemistry, Chinese Academy of Sciences, 550002 Guiyang, China;(3) Max-Planck-Institut für Chemie, 50674 Mainz, Germany |
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Abstract: | The Qingzhen and Yamato 691 (EH3) enstatite chondrites, which formed under extremely reducing conditions, are studied using
the scanning electron microscope and electron probe microanalyzer. Both meteorites contain FeO-rich silicates and minor Ca,
Al-rich inclusions. Most FeO-rich silicates are Ca-poor pyroxenes and occur as fragments in matrix. A few grains of FeO-rich
silicates were found in chondrules, and FeO-rich olivine is rare. In Qingzhen, FeO-rich silicates commonly contain abundant
dust-like Ni-poor metals, which probably formed through reduction of FeO. In contrast, only a few fragments of FeO-rich silicates
in Yamato 691 enclose dust-like metals. This difference is consistent with a more reducing condition of Qingzhen than Yamato
691. Ca, Al-rich inclusions have similar modal compositions and mineral chemistry as their counterparts in carbonaceous chondrites.
We suggest that (1) the FeO-rich silicates probably formed in oxidized regions of the solar nebula, and then moved into the
enstatite chondrite locations; and (2) Ca, Al-rich inclusions in both enstatite chondrites and carbonaceous chondrites may
have similar origins and reservoirs. |
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Keywords: | solar nebula meteorite enstatite chondrite reduction migration |
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