<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> Many thanks, Lisa, for the references you gave for the Yellowstone Hot Spot! Question 1:  Are any on the Web with open access?  You mentioned some PDF files.  I am fascinated by the findings lying beneath Yellowstone Lake. Question 2:  Robert Smith gave a lecture on the Yellowstone Plume this last summer at the Salt Lake City Public Library.  He showed a recent  computer graphic of the plume underlying Yellowstone (made from seismic studies).  I was awe struck by the plumes size!  He rotated it to give the audience a perspective of what it looked like --- very irregular and extending VERY deep, like an elongated potato, down into the earth.  I would also LOVE to get my hands on this visual!  Is there anything on the Web, that you know about, showing this visual? I do remember that if you picture a baseball and place a postage stamp on it, the baseball would roughly represent the size of the plume ... the postage stamp would represent the present boundaries of Yellowstone. Wayne Simister -------------------------------------------- Lisa Morgan wrote: <blockquote cite="mid6.0.1.1.2.20061017124045.02f2e640@gscodenm05.cr.usgs.gov" type="cite">Several research papers have been written on the track of the Yellowstone hot spots by Ken Pierce and myself.   These include: Pierce, Kenneth L., and Morgan, Lisa A., 1992, The track of the Yellowstone hot spot: Volcanism, faulting, and uplift, in Link, P.K., Kuntz, M.A., and Platt, L.B., eds., Regional geology of eastern Idaho and western Wyoming, Geological Society of America Memoir 179, p. 1-53. Pierce, Kenneth L., Morgan, Lisa A., and Saltus, R.W., 2004, Yellowstone plume head: Postulated relations to the Vancouver slab, continental boundaries, and climate, in Bonnichsen, B., White, C.M., and McCurry, Michael, eds., Tectonic and Magmatic Evolution of the Snake River Plain Volcanic Province, Idaho Geological Survey Bulletin 30, p. 5-33. Other papers of interest related to Yellowstone, the hot spot, and hydrothermal activity in Yellowstone that Ken, myself, and colleagues at the USGS have written are: Morgan, L.A., and McIntosh, W.C., 2005, 40Ar/39Ar Ages of Silicic Volcanic Rocks in the Heise Volcanic Field, Eastern Snake River Plain, Idaho: Timing of Volcanism and Tectonism, Geological Society of America Bulletin, v. 117, no. 3/4, p. 288-306. Lowenstern, Jacob B., Christiansen, Robert L., Smith, Robert B., Morgan, Lisa A., and Heasler, Henry, 2005, Steam Explosions, Earthquakes, and Volcanic EruptionsWhat’s in Yellowstone’s Future?, U.S. Geological Survey Fact Sheet 2005-3024, 2005, 6 p. Morgan, Lisa A. and Shanks, W.C. Pat III, 2005, Influences of rhyolitic lava flows on hydrothermal processes in Yellowstone Lake and on the Yellowstone Plateau, in William P. Inskeep and Timothy R. McDermott (eds.), Geothermal Biology and Geochemistry in Yellowstone National Park, p. 31-52. Shanks, W.C. Pat, Morgan, Lisa A., Balistrieri, Laurie A., and Alt, Jeffrey C., 2005, Hydrothermal vents, siliceous hydrothermal deposits, and hydrothermally altered sediments in Yellowstone Lake, in William P. Inskeep and Timothy R. McDermott (eds.), Geothermal Biology and Geochemistry in Yellowstone National Park, p. 53-72. Finn, C.A. and Morgan, Lisa A., 2002, High-resolution aeromagnetic survey of volcanic terrain, Yellowstone National Park: Journal of Volcanology and Geothermal Research 115, p. 207-231. Morgan, Lisa A., Shanks, W.C. III, Lovalvo, David, A., Johnson, S.Y., Stephenson, W.J., Pierce, K.L., Harlan, S.S., Finn, C.A., Lee, G., Webring, M., Schulze, B., Dühn, J., Sweeney, R., and Balistrieri, L., 2003, Exploration and Discovery in Yellowstone Lake: Results from High-Resolution Sonar Imaging, Seismic Reflection Profiling, and Submersible Studies in Journal of Volcanology and Geothermal Research, v. 122, p. 221-242.    Other papers soon to be published are: Pierce, K.L. Despain, D., Morgan, Lisa A., and Good, J., 2005, Effects of Hotspot-related Volcanism, Faulting, and Uplift on the Greater Yellowstone Ecosystem and Human Geography, in Morgan, L.A. (ed.), Integrated Geoscience Studies in the Greater Yellowstone Area: Volcanic, Tectonic, and Hydrothermal Processes in the Yellowstone Geoecosystem, U.S. Geological Survey Professional Paper 1717. Morgan, Lisa A., Shanks, W.C. Lovalvo, D., Lee, G., Pierce, K.L., Webring, M. Stephenson, W.J., Johnson, S.Y., Finn, C.A., Harlan, 2005, The Floor of Yellowstone Lake is Anything but Quiet:  New Discoveries from High-Resolution Sonar Imaging, Seismic Reflection Profiling, and Submersible Studies, in Morgan, Lisa A., (ed.), Integrated Geoscience Studies in the Greater Yellowstone Area: Volcanic, Tectonic, and Hydrothermal Processes in the Yellowstone Geoecosystem, U.S. Geological Survey Professional Paper 1717. Shanks, W. C. III, Alt, J., and Morgan, Lisa A., 2005, Geochemistry of sublacustrine hydrothermal deposits in Yellowstone Lake: hydrothermal reactions, stable isotope systematics, sinter deposition, and spire growth, in Morgan, Lisa A. (ed.), Integrated Geoscience Studies in the Greater Yellowstone Area: Volcanic, Tectonic, and Hydrothermal Processes in the Yellowstone Geoecosystem, U.S. Geological Survey Professional Paper 1717<a name="OLE_LINK2"></a>. Saunders, A.D., Jones, S.M., Morgan, Lisa A., Pierce, K.L., Widdowson, M., and Xu, Y., 2006, Regional uplift associated with continental large igneous provinces: The roles of mantle plumes and the lithosphere, in Chemical Geology Morgan, Lisa A., Shanks, W.C. Pat, and Pierce, Kenneth L., in press, Bathymetry, Geology, and Selected Perspective Views of the Floor of Yellowstone Lake, in U.S. Geological Survey Scientific Investigations Map Series (tba), 2 plates. A couple other research papers related to large hydrothermal explosions and features in Yellowstone are currently in review. Reprints and pdf's are available upon request to me at <a class="moz-txt-link-abbreviated" href="mailto:lmorgan@usgs.gov">lmorgan@usgs.gov</a> Lisa Morgan </blockquote> </body> </html>