. Additional notes on the Grinnell ice-cap. Ice -- Nunavut Baffin Island. The Mapleton Meteorite 105 pattern (fig. 37). There are many cracks in the section, most of which follow the general octahedral planes. The cracks are narrow and are stained with limonite. The zone of alteration is clearly visible. Its inner boundary is slightly lighter, and thus serves as a line of demarcation. The depth. Fig. 38. Typical kamacite bands, showing varying widths. Plessite fields seen here are chiefly rhomboidal. XlO. to which alteration has taken place is shallow and is variable (from a fraction of a mill
. Additional notes on the Grinnell ice-cap. Ice -- Nunavut Baffin Island. The Mapleton Meteorite 105 pattern (fig. 37). There are many cracks in the section, most of which follow the general octahedral planes. The cracks are narrow and are stained with limonite. The zone of alteration is clearly visible. Its inner boundary is slightly lighter, and thus serves as a line of demarcation. The depth. Fig. 38. Typical kamacite bands, showing varying widths. Plessite fields seen here are chiefly rhomboidal. XlO. to which alteration has taken place is shallow and is variable (from a fraction of a millimeter to mm.). This indicates, as has been stated above (p. 101), that the mass had disrupted during its flight to the earth and that different surfaces were exposed to heat for varying lengths of time. The meteorite did not suffer prolonged heating, as might be inferred from the shallow depth of the zone of alteration and from the absence of any marked change in its principal components (kamacite, taenite, and plessite fields) in the altered zone. The kamacite bands (fig. 38) are fine-grained to granular and vary in width from mm. to mm. Some are wider and have a swollen appearance, with an average width of 3 mm. These larger bands are not conformable with the octahedral structure (fig. 39), though they are roughly oriented. A few of the larger bands appear to have coalesced into a fascicle. Some of the kamacite bands, in U. JF ILL Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Roy, Sharat Kumar, 1897-1962. Chicago : Field Museum of Natural History
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