The Hydrology and Evolution of Basaltic Landscapes: Notes from GSA Sunday

A post by Anne JeffersonHood_River.JPG
Like many North American geobloggers, I’ve recently returned from the Geological Society of America meeting in Portland, Oregon. It was a bittersweet trip for me, as it was a return to my spiritual homeland, where I spent five happy years working on the rocks and waters of the Cascade Range. Since then, I’ve felt a bit exiled on the Eastern Seaboard, so it was perhaps apropos that the trip back was a bit of a tease…in my four days in Oregon, I did not manage to see a single mountain. The picture to the right is the Hood River, draining the north side of Mt. Hood, about 45 minutes east of Portland. It was taken in April 2007, during field work for my post-doc.
After an unexpectedly long layover in Phoenix and an entirely unexpected layover in San Francisco (thank you, US Airways), I arrived in Portland at 1 am local time Sunday morning. With any potential time-change/jet-lag problems thus mitigated, I arrived bright eyed for the first talks on Sunday morning.
The main order of business on Sunday morning was the Pardee Keynote Symposium on “The Evolution of Basaltic Landscapes: Time and River and the Lava Flowing.” I arrived in time to hear a fascinating talk on “Impacts of basaltic volcanism on incised fluvial systems: does the river give a dam?” by blogger/tweep/mapper extraordinaire Kyle House. He was talking about the lava dams, debris flows, and river incision of the Owyhee River of eastern Oregon. After a few gorgeous photos accompanied magnificent Lidar images, I was thoroughly convinced of the utility of Lidar for high-resolution geological mapping. I was also salivating at the thought of a whole day of water + lava talks full of gorgeous volcano photos.
After Steve Ingebritsen gave a lovely overview of the hydrogeology of basalts, Dennis Geist convinced me that I absolutely have to go to the Galapagos Islands, by showing pictures of volcanoes with whales for scale. His talk focused on the connections between geology and biology in the Galapagos, and got me thinking about the implications of volcanic emergence and subsidence for the evolution of the creatures of the famous archipelago. While Geist tried to convince his audience that the vegetation of the Galapagos is supported with basically no soil, neither I nor the next speaker, Oliver Chadwick, quite believed him on that point.
Indeed Chadwick talked about the patterns and processes of soil development on basaltic landscapes, where weathering rates depend not only on the usual climatic factors but also on the flow texture – with aa and pahoehoe flows exhibitting different patterns and timescales of soil development. For my own work, one key point that Chadwick made was “At some point in the history of lava flows, the surface becomes less permeable than the whole…” I think that statement has implications for the way we think about drainage development in basaltic landscapes, but I’ll wait to say more about that until my publication and/or funding record bear me out.
I spent my afternoon thinking more about basalt hydrology, in a session on “Hydrologic Characterization and Simulation of Neogene Volcanic Terranes.” I’ve got lots of notes from that session that are probably of interest only to me, but I will say that it was exciting to hear one of the grad student speakers say to me “I’ve been reading your dissertation” and to hear my work cited more than once. It is such a relief to know that people working in the field actually find my work interesting or useful. Towards the end of the session, I gave a talk on the geomorphic and hydrologic co-evolution of the central Oregon Cascades Range. My talk was based on a paper that has undergone several major revisions since my Ph.D. days, and it was a pleasure to share the latest and greatest incarnation of my thinking on the subject. The pleasure was immeasurably increased by a recent letter from the journal editor giving me only very minor revisions to do before acceptance.
On Sunday evening, the attendees of the morning talks reconvened for a wine tasting with a geological theme – the terroir of taste of Oregon wines grown on basalt versus sandstone. The wine was donated by Willamette Valley Vineyards (basalt) and King Estate (sandstone), and we got to hear from the wine makers as we sipped their wares. According to them, if you see a 2008 Willamette Valley appellation Pinot Noir or Pinot Gris, snap it up. They reckon it will be the best year ever for Oregon wines. That’s saying quite a bit, since Oregon is consistently recognized as one of the world’s best Pinot producing regions.
After a day of stimulating talks and invigorating conversation, I was ready to dive into two days focused on groundwater-surface water interactions and a day of snow, mega-floods, and debris flows to round out my conference. But my notes on those days will have to wait for now, as those paper revisions are not taking care of themselves.

Categories: by Anne, conferences, geomorphology, hydrology, volcanoes
Tags: , , , , , ,

Comments (5)

  1. Todd says:

    Sorry to have missed seeing you and hearing your updated work. I was presenting my work on another volcanic terrane – Japan. It was painful to not attend a big event in my backyard, but it was nice to see the sun in the land of the rising sun. Best to the family.

  2. Michael says:

    Would like to have been there for this session (not to mention many others).
    It’s probably not widely appreciated that fundamental and radical geological thinking of the early nineteenth century took place in exactly this kind of environment. In the 1820s the gloriously-named British geologist, George Julius Poulett Scrope, worked among the young volcanoes of the French region of the Auvergne and assembled a carefully documented story of geomorphologic evolution and the interaction between rivers and lava flows. Lyell and Murchison hotfooted it down there shortly after Scrope published his first description, and came to the same conclusions – Lyell’s subsequent work drew heavily on Scrope’s.
    Scrope put together the evidence that dismissed the ante and post diluvian view of the earth’s history, confirmed the settlement of the volcanist/neptunist debate, and demonstrated the requirement for today’s processes working over immense lengths of time. As he wrote, somewhat melodramatically in 1827,
    “Every step we take in its [geology’s] pursuit forces us to make almost unlimited drafts upon antiquity. The leading idea which is present in all our researches, and which accompanies every fresh observation, the sound of which to the ear of the student of Nature seems continually echoed from every part of her works, is‚Äî Time! ‚Äî Time! ‚Äî Time!”
    I recently had the pleasure of wandering around the Auvergne with a copy of Scrope’s descriptions (and exquisite illustrations) in my hand, trying (largely successfully) to reconstruct his observations. I plan to blog on it at some stage, but your post prompted me to write.

  3. Lockwood says:

    Thanks for a great summary of a lot of interesting presentations! There’s an article from OregonLive (The Oregonian online) on the wine talk that you might find interesting.

  4. Todd: Sorry to have missed you. I would love to know what you are up to these days.
    Michael: I know very little about the basaltic landscapes of France, so I am now eagerly awaiting your post.
    Lockwood: There were several wine talks at GSA, even an entire session devoted to terroir – in fact, grapes seemed to permeate the entire conference. This has me contemplating what exactly we’ll be able to comparably provide in Charlotte in a couple of years…the terroir of barbecue?

  5. In remote sensing, false color images such as LIDAR elevation maps are common