A primitive dark inclusion with radiation-damaged olivine in the Ningqiang carbonaceous chondrite

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Carbonaceous Chondrites, Dark Matter, Olivine, Radiation Damage, Magnetite, Recrystallization, Inclusions, Scanning Electron Microscopy

Scientific paper

Ningqiang is a unique carbonaceous chondrite, with similarities to the oxidized CV3s, and includes abundant magnetite, awaruite, CAIs, fayalitic olivine and dark inclusions (DIs). It has a somewhat lower refractory lithophile-element content and a higher carbon and H2O abundance than typical CV3s. We have examined a large (5 mm) Ningqiang DI in order to assess its origin and its relationship to host Ningqiang and to DIs in CV3 and other carbonaceous chondrites. This DI indicated a more primitive nature that previously studied DIs, and provided a wider window to nebular history. The DI in Ningqiang was studied by EMPA, SEM and TEM techniques. It was cut, polished and thin-sectioned, and two chips of the DI and one of the host rock matrix were ion-milled for TEM investigation. Laboratory-derived k-values were used; most analyses are precise to within 3 percent relative, those for olivine are precise to within 1 percent relative for major elements.

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