Blue-black fans, brown blotches
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tolik83
Am I right in assuming that the brown blotches are of more recent origin than the blue-black fans? Or what can account for the different color?
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DannyU
that's the theory. the dark parts of the fans are presumably recent, while the blue halos are the frost remnants of earlier activity in the same spot.
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tolik83
But the interesting fact is, that in addition to the blue halos and the black fans, you also have (only a few) brown blotches.
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DannyU
the larger brown blotches suggest a less dense dispersion of dust for which I imagine there are several possible causes, such as the case where a blotch might be created by a series of small overlapping indistinct fans
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tolik83
The way I understood it so far is, that if there is no wind when a sand geyser erupts, the dust will not be dispersed in one direction, but falls down to the ground in a more or less circular pattern around the blowhole. I just wonder, whether there is any significance in the fact that the material that created the blotch is brown, and thus a different color than the fans...
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DannyU
that's the correct mechanism but in this image I'm not inclined to make a marked distinction between the browner areas and the blacker ones
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trebor82
I thought that the "blue" is either frost or some sort of gas like Argon or co2. I am sure you can tell what sort of substance it is by its color. Each element i associated with a certain color, or have I got that wrong. please correct me and let me know if I am wrong. cheers
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DannyU
the blue is believed to be CO2 frost, a remnant of prior eruptions
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