THAT's very hot! Yes, many molecules will break up at that temperature.
We're talking hydrocarbons, here, I think. I'd be willing to bet on it (but only a cup of coffee!:-)). Fats are hydrocarbons. Methane is a hydrocarbon. You know what people will think of when they hear that word?... There's oil on Mars!!!
I agree, it's got to be hydrocarbons, oil. Mars is greasy. Now we can make fuel for return trips home.
Here's what I think is the background of what is at issue here. Previously in the 20th century before space probes and larger telescopes which could measure the chemical composition of the planets, methane and hydrocarbons were thought to only exist on Earth, as they were created by living organisms. In fact, one early test for livf on other planets was to detect methane. Methane = life, as simple as that.
However, that got blown out of the water as all of our large gas giants have significant proportions of methane, plus at least the moon Titan. Yet no one now proposes that there is life there based on only the presence of methane. And so now we have at best inconsistent explanations as to why there is methane on different planets.
There has been methane detected on Mars. So, where does all this methane in the solar system come from? On Earth, it is declared to be biological processes, on other planets, it isn't, on Mars, they are sitting on the fence.
The origin of methane and petroleum itself has different theorys, including the Abiogenic petroleum origin, proposed by Thomas Gold. While that theory is not in favor, it was the only theory I know of that takes into account that methane is being found all across the solar system.
So basically, the methane on Marss is either being created by living organisms, or it is being outgassed from the rocks of mars itself, in a way that science has currently not supported.