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cossatot / ssrd_pecube

Pecube model of the South Snake Range Detachment
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NSRD? #9

Closed cossatot closed 9 years ago

cossatot commented 10 years ago

We can discuss more whether we want to model the NSRD too.

I think we should consider it, but take stock of how much data there is, how good that data is, and how much structural complexity there is.

Also, we should probably successfully model the SSRD first, just to see how it goes on the UNLV cluster.

eqsarah commented 10 years ago

All very reasonable. I'll wait for gathering all that data together once we've got the SSRD hammered out.

cossatot commented 10 years ago

What would be really really cool is if we could date doming of the NSRD. Did it happen during unroofing, i.e. the main phase of detachment faulting, as suggested by Gans and others? Or did it happen later, maybe due to slip on the Schell Creek fault? This would be a pretty significant discriminator of whether the NSRD continues west-dipping underneath Spring Valley or had a breakaway just west of the NSR that is now covered by Neogene growth strata.

eqsarah commented 10 years ago

I can't remember if the specific timing of doming is addressed in Cooper et al 2010 in the NSRD, but that paper is tickling my brain when I think about this idea...I would need to go back and read it more detail once I get the SSRD thermal parameters finished up. Nothing in the abstract jumps out at me, but she did work on dating the timing of different shear episodes on the NSRD. Here is a link for the paper if you're interested:

http://research-information.bristol.ac.uk/files/5944630/Cooper_Tectonics_2010.pdf

She has another one about the dip of the footwall of the NSRD too. It's pretty interesting from what I recall. I just really haven't focused as much on the NSR literature because of the major difference in magnitude of strain accommodated in the NSR, and the higher extension amounts in the NSR compared to the SSR.

cossatot commented 10 years ago

Ahh, this paper... I'd forgotten about it. I need to look it over. It seemed like good work when I read it, but thinking about it now, it's pretty common for post-seismic relaxation to induce opposite sense of ductile flow in the shear zone below a fault. I wonder if this is something that makes a difference here when she mentions the mutliple phases of shear on the mylonites.