Science  01 Jun 2001:
Vol. 292, Issue 5522, pp. 1651b
DOI: 10.1126/science.292.5522.1651b

In our report entitled “corundum, rutile, periclase, and CaO in Ca, Al-rich inclusions from carbonaceous chondrites” that appeared in Science on 31 May 1996 (p. 1316), we incorrectly interpreted single crystal electron diffraction patterns of oxide phases in Ca, Al-inclusions (CAIs) from carbonaceous chondrites.

CAIs found in carbonaceous chondrites contain refractory minerals such as spinel, melilite, fassaite, hibonite, grossite, and perovskite. In our 1996 report, we described the occurrence of submicrometer-sized oxide phases in these inclusions. Rutile, corundum, periclase, and CaO were identified in four CAIs from four different chondrites. The single oxide phases were identified by energy dispersive x-ray analyses and selected area single crystal diffraction patterns. After remeasurement of the electron diffraction patterns of the oxides, it was found that these assignments were incorrect.

Thus, the single oxide phases reported in the 1996 paper by A. Greshake et al. might be local contaminants or weathering artifacts, and any conclusions drawn from the occurrence of the single oxide phases are not valid.

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