What are these mysterious black splotches on the surface of Mars?

[pokerfan]

By Robert T. Gonzalez
Mar 2, 2012 1:20 PM

Mars may look red from here on Earth, but up close, the surface of the "Red Planet" is actually a variety of colors. In fact, many of them aren't very red-looking at all.

Case in point: the dunes in Mars' northernmost latitudes, like the ones pictured here. But wait a minute, you may be thinking. Those dunes look pretty red to me, or at least a little pinkish. And you'd be right — if what you were describing was in fact the Martian surface. But it isn't. [Hi-res image available here]

What are these black splotches on the surface of Mars? Those black splotches are the surface of Mars. The dunes only appear pink because they are covered in frozen carbon dioxide. NASA HiRISE scientist Cindy Hansen explains:

http://io9.com/5889914/what-are-these-mysterious-black-splotches-on-the-surface-of-mars

The link is worth following if only to see the hires (2,560px × 1,920px) version of the image.

[randr]

1. Quick send up the Koch brothers

looks like oil to me.

[pokerfan]

7. Oil?

We'd launch at the next available window (December 2013).

[Faygo Kid]

2. Looks like raspberry sherbet gone bad

I hate when that happens.

[Old and In the Way]

3. Rock formations? nt

[Drale]

4. Remnents of an ancient war? /nt

[DJ13]

5. Oh.My.God

OIL!

We MUST invade....NOW!

[Gman]

6. Looks like ants

Maybe spiders

[eppur_se_muova]

8. Interesting.

Too abundant for recent meteor impacts, and they only appear near the crests of the dunes (if I'm seeing perspective corrrectly).

Probably turn out to be more iron oxides, like the "blueberries". Given that they're lying on top of CO2, maybe siderite (iron carbonate).