Dione |
Dione |
Nov 26 2004, 12:27 AM
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#1
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Senior Member Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
Beautiful image of Dione
If Dione didn't have those white streaks it would look a lot like Iapetus |
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Dec 16 2004, 05:13 PM
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#2
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
QUOTE (Decepticon @ Dec 15 2004, 04:09 PM) Are these fractures from tidal forces? Dinoquakes If they were, I'd expect them to be centered on the anti- or sub-Saturnian hemispheres but instead they are roughly centered in the trailing hemisphere. My thinking is that early in Dione's history (given that there are a few large craters post-dating the fracturing) a diapir of warm ice inpinged on the brittle icy crust from below. The extent of the volcanism was just a round of outgassing that produced the dark diffuse material (dark in UV). Then as the stresses increased, the crust fractured as you see it today. This must have been early, maybe ~4 Ga, or there abouts. that's just MY idea, I still haven't vetted that through the team and I am certainly no expert on the history and physics of mid-sized icy satellites. I am just trying to come up with a way to causing such extensive fractuing focused on one area (and dark material in one area) yet have much of the rest of the satellite look as dead as a doornail. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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