Note the lack of correlation between bright features in the top image and Sc distribution in the lower image. Profile across the boundary between core and rim as marked in showing variation in Sc and Y. Note that the contact between the two domains is depicted by a ~1 µm-wide zone enriched in Y and to a lesser extent, also Sc. Figure 12.HAADF-STEM images showing baddeleyite in hematite .
STEM-EDS element mapping shows a relative enrichment in Sc within the grain core but no direct correlation between chemistry and the bright streaks/spots on the HAADF image. This information complements other data about the distinct chemistry of the core and rim zones, the rims appearing depleted in P on EPMA maps, and are seen to be enriched in U on BSE and CL images . Such chemical variation suggests that the core and rim domains in granular zircon result from an overprint event traceable down to the nanoscale rather than primary growth. Figure 9.EPMA element map of granular zircon from the studied hematite ore.
Note, however, the stepwise defect at the immediate contact between the two minerals. High-resolution images showing distribution of Fe and Zr in Hm and Bdy, respectively, on zone axes as marked. Arrangement of atoms correspond to crystal structure models for the zone axis in each mineral as marked. Figure 7.BSE images and representative time-resolved depth profiles of “clean” hematite and hematite with baddeleyite inclusions . Note the smooth signal for Zr in both cases but a difference in the intensity of the signal, which is an order of magnitude higher in the second case.
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Larger, single grains of zircon occur within hematite and these are surrounded by radial cracks . Such grains display asymmetric cores and rims with brighter bands marking the two domains on BSE images. Fluorapatite, xenotime- and pores are noted particularly within the cores or towards corroded margins in zircon .
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Bright Field – and HAADF-STEM images of zircon foil. High resolution image of Zrc on zone axis and corresponding indexed FFT in . The bright spots represent Zr + Si atoms with arrangement corresponding to crystal structure model https://loveexamined.net/hawaya-review/ on zone axis in Zrc. Reflected light image and LA-ICP-MS element maps of granoblastic hematite showing hematite cores enriched in Zr, Hf, Ti and Cr, with margins depleted in these elements but enriched in Nb, Sb, Sn and W.
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