3.2.4. X-Ray Mapping
In addition to BSE, the microprobe can produce images in X-ray light, where characteristic X-rays from a given element are detected and their position recorded or "mapped." This permits the production of maps showing the distribution of specific elements. These are recorded as TIF files using the computer system and can be manipulated using any image processing or analysis program.
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Figure 3.2.4. Element and BSE maps of a chondritic meteorite. The largest grains are zoned olivine with Mg-rich cores and Fe-rich rims as shown in both the BSE image and the Mg-Ka and Fe-Ka maps. The brightest grains on the BSE image appear as black "voids" in the Si-Ka map. These are iron sulfides as revealed by the S-Ka and Fe-Ka maps. The darkest areas on the BSE image are high-Si glass and appear black on all but the Si-Ka map. |
