Eocene Farallon Lithospheric Chalupa

Also see my second post relating to the Farallon Plate here.

This past Friday I was talking with some of the people in my research group and we ended up discussing our favorite published figures. This is easy for me, hands down, it is the Eocene Farallon Lithospheric Chalupa of Humphreys (1995). I’ll explain why I love this figure in a minute, but first…

I don’t think I’d be out on a limb to say that when many geologists first look at a paper, they begin by studying the figures. Many branches of geology are very visual, the ultimate goal often being complete 4 dimensional reconstructions of complicated events. As such, most earth scientists spend a great deal of time learning how to make good figures. For many geologists, the steep part of this learning curve is field camp, when they first learn how to make geologic maps.

I think if you want to consider the information density of a figure, nothing can beat a geologic map. I am continually amazed at the amount of information that trained geologists can gather from geologic maps. The amount of information packed into a geologic map of course depends on the quality and scale of the map itself, but really good maps can detail billions of years of faulting, folding, erosion, magmatism, deposition, and metamorphism.

And one more “quick” aside. I think that my general reverence for geologic maps has played into my slight annoyance with Edward Tufte. This is probably entirely stupid and absurd on my part; I apologize in advance and fully accept criticism, but I am continually amazed that Tufte doesn’t spend more time singing the praises of geologic maps. I had a chance to attend a public lecture by Tufte a few years ago. In general, I am a big fan of many of Tufte’s ideas. I think that many people, geologists included, need to think seriously about how they visually represent their information. I think that geologists already have to spend a lot of time doing this, and so some of the examples seem kind of basic. I think this molehil of an annoyance of mine became a small end moraine of annoyance when I saw Tufte speak. First the background, this was a public lecture attended by about 600 people. Although Tufte is not categorically against things like PowerPoint or slides, he is much more in favor of archival quality paper. Unfortunately, these are expensive, and impractical for 600 people. So, the first 200 or so people who got into this lecture had beautiful large images to look at during the talk, images on such incredible paper that they are undoubtedly as bright and colorful today as they were 2 years ago. The rest of us got to crowd a dozen or so people around a single piece of paper, trying to follow along with his message. I would have loved a crappy PowerPoint slide complete with kitten background and lightning sound effects. I guess I am saying that I think it is important to strike a balance between quality and accessibility.

Long story short, I get a little bit stuck-up when it comes to geologists and visual representations of data. That is why I’ve decided to start blogging about some of my favorite figures.

So to start we have the Eocene Farallon Lithospheric Chalupa, published in 1995 in a paper by Eugene Humphreys (Geology, v. 23, n. 11, pp. 987-990). What this figure shows is his preferred model for the removal of the Eocene Farallon slab. The idea is that during the Laramide orogeny, the Farallon slab was subducting at a very shallow angle, effectively transferring plate boundary forces into the interior of the continent during the Laramide orogeny (making some of the Rocky Mountain structures). Beginning in the Eocene this slab was somehow removed, allowing hot asthenosphere to rise up and introduce a great deal of heat and basaltic magma into the western North American lithosphere. This led to the “ingimbrite flare-up,” a period of intense volcanic activity in western North America, from Washington in the north down into northern Mexico. Volcanic activity did not begin everywhere at the same time, in fact it seems to have started at the northern and southern margins of the province in the Eocene. The volcanic front moved south from Washington, and north from Mexico, eventually meeting around Las Vegas in the Miocene (Vegas baby!) Many geologists interpret this to be the result of the gradual peeling away of the Farallon slab from both the north and south at roughly the same time.

So, here is the figure, the Eocene (~35 Ma) Farallon Slab!

So, with that background, what Humphreys attempts to explain in this paper is that pattern of magmatism, and how it could be related to slab removal. My favorite figure is his preferred model for Farallon slab removal. Why do I love this figure? Well.

  1. It make sense. It takes a while to wrap your head around, but it explains the removal of the slab, and the associated patterns of magmatism.
  2. The perspective. The view is looking up from the mantle somewhere underneath eastern Canada. The view is looking to the west, with the subducting Farallon slab coming right at you. I am used to map view and cross-sectional views, but I love the moxy to use this perspective. I wish google earth had this view.
  3. The approximation. I like the fact that this is simplified and hand made. I don’t think Illustrator has a feature that makes buckled subducting slabs. In my geologic education I have definitely felt pressure to make diagrams crisp and Illustrator-ific. I can imagine this figure originated on a sketchpad or (if I were to write this as a legend) cocktail napkin, and didn’t get caught up in the refinement process.
  4. It reminds me of a chalupa. Not that I consider Taco Bell excellent cuisine, but the buckled Farallon slab is a dead ringer for an enormous chalupa. And, it should be noted, that downing chalupas can also lead to flare-up events. I love mexican food, and Taco Bell is a distant cousin of mexican food, so that makes me smile.
  5. I think my favorite thing though, is the fact that I didn’t buy this figure at first. I first saw it in a seminar on Cordilleran geology when I was in graduate school. I remember spending a great deal of time trying to figure out what it was representing, and why this was the preferred model. At first I thought it was absurd and overly complicated. I am not an expert on slab removal or the ingimbrite flare-up, but I am now pro-Farallon Chalupa. Every time this figure comes up people who’ve never seen it are always unsure. Geology can be complicated. Geologic maps are complicated if you aren’t used to looking at them. So I like that this image makes brains work. I don’t think anyone immediately accepts this diagram, which is good. It is immediately interactive.

So what are your favorite figures? Any nominations? Feel free to nominate yourself if you have a figure you are particularly proud of.

This entry was posted in dealing with data, earth hazards, Figure Hall o' Fame, impending thermochronocracy. Bookmark the permalink.

6 Responses to Eocene Farallon Lithospheric Chalupa

  1. andrew says:

    I’m glad not to be the only person who feels curmudgeonly about Edward Tufte. His critiques are easy rants and his tastes are overrefined. But his print porn is quite seductive, rather like a < HREF="http://geology.about.com/library/weekly/aa100800a.htm" REL="nofollow">good geologic map<>.

  2. thm says:

    One thing to keep in mind with Tufte is that he’s a political scientist by trade, and the target audience of his works seems to be people with social sciences degrees: people who do have to deal, in some sense, with numbers, but who still have a deep-seated fear of them. Physics (my field)–and I suspect the rest of the physical sciences (but not engineering)–is so inherently quantitative that most of the important stuff that Tufte writes about is already a part of the culture, stuff that you just sort of pick up by reading and writing journal articles. Tufte is really about how to tell a story with numbers and graphics.I don’t see much pressing need for Tufte’s work in the scientific community, but at venues like community meetings, or in reading reports about, say, city development policies, I see all sorts of garbage–graphs that don’t tell a story, for example, or figures that use the wrong denominator–that screams out for some instruction in the visual display of quantitative information.

  3. Anonymous says:

    a second attempt to comment (d*mn you firefox!)I just discovered this blog,and it is fantastic. As a recovering thermochronologist, I enjoy the technical tidbits and the commentary. Great stuff!IMHO, the king of figures is Ed Garnero at ASU. Just about everyone in seismology uses his cartoons and animations.only anon postings are functioning, so I’ll sign off as…-The Lesser Half

  4. Anonymous says:

    Thanks for an interesting blog. I’m a scientific illustrator and certainly appreciate your comments about the value of a good illustration. In fact, being in the Midwest and having felt the effects of the recent Illinois earthquake (and being an aficanado of natural disasters..blush, blush) I happened across your blog in search of a good illustration of the Farallon slab. ~E Grant

  5. THM – I agree that Tufte’s message is not necessarily aimed at the scientific community, and that there are many arenas that need his ideas. I think I am grumpy about him primarily because of my experience at his presentation. Probably not fair.Anonymous – Thanks for the name drop of Ed Garnero! Man, I just spent some time on his website (http://garnero.asu.edu/) being blown away by his figures. This will be a link on my blog soon. “Recovering thermochronologist,” I think we need to have some sort of support group!E Grant – I’ve found my site being hit quite a bit recently as a result of google searches for “farallon plate.” Glad I could be of help!

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