Wednesday, March 19, 2008

April 2008 Geology: articles I want to read

I'm running off to Las Vegas for the Rocky Mtn/Cordilleran section GSA meeting this evening, but hopefully I'll be able to carve out time to read some of the articles that have just become available from next month's issue of Geology:

Seismic imaging of subduction zone metamorphism, by St├ęphane Rondenay, Geoffrey A. Abers, and Peter E. van Keken.

They found eclogites in seismic profiles of the Alaska and Cascadia subduction zones. I mean, yeah, they ought to be there, and we find fossil subduction zones, in part, by finding blueschists and eclogites. But there they are.

Toroidal mantle flow through the western U.S. slab window, by G. Zandt and E. Humphreys.

What's going on in the mantle under the Basin and Range, anyway? And what does it mean for the rates of extension in the northern and southern parts of Nevada?

Porphyroblast rotation versus nonrotation: Conflict resolution! by C. Fay, T.H. Bell, and B.E. Hobbs.

One wouldn't expect something as pretty as a snowball garnet to create really acrimonious debate, but it has. Do garnets rotate? Does the world (or maybe just the foliations) rotate around the garnets? Is it safe to go back to the thin sections and interpret them for shear sense?

(Source: Dr. Pierre Dezes, University of Basel)

Toasting the jelly sandwich: The effect of shear heating on lithospheric geotherms and strength, by Ebbe H. Hartz and Yuri Y. Podladchikov.

I love the jelly sandwich analogy. The upper crust is strong, the lower crust is weak, and the mantle lithosphere is strong again. In some places. There's been debate in GSA Today over the past few years, and it makes for great discussions in my Tectonics class. And now there's another source of heat to consider.

Hot arguments to cool off the plume debate, by Cornelia Class.

This one's a Research Focus article, which means that the entire thing is available online for free. Is there any data that could solve the mantle plume debate? Read the commentary and see what Class thinks. (I will... this afternoon. Maybe.)


Elli said...

I just saved a number of articles from the same issue to be read... later... maybe once I have a few more weeks of lecture done :)

Kim said...

It's Petrology and Structure and Tectonics month in Geology, it seems. I wonder if the people dealing with near-surface geology have all run to Nature Geoscience? I hope not - I would rather have two journals that have a mix of papers, rather than have to argue about whether hard rock geology is less prestigious than paleoclimate, because paleoclimate is in Nature (Geoscience) and hard rock stuff is in Geology.

andrew said...

"Toroidal mantle flow through the slab window" reminds me of smoke rings.

Hey, hope I see you tomorrow.

CJR said...

Bah. No electronic access to Geology...

With regards to the jelly sandwich - you might want to check out this

Kent said...

Nice! We were just introduced to that (now outdated?) garnet topic in class... Love coincidences like that.