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Continental-Scale Links Between the Mantle and Groundwater Systems of the Western United States: Evidence from Travertine Springs and Regional He Isotope Data

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Continental-Scale Links Between the Mantle and Groundwater Systems of the Western United States: Evidence from Travertine Springs and Regional He Isotope Data VOL. 15, No. 12 A PUBLICATION OF THE GEOLOGICAL SOCIETY OF AMERICa DECEMBER 2005 Continental-scale links between the mantle and groundwater systems of the western United States: Evidence from travertine springs and regional He isotope data Inside: Continental-scale links between the mantle and groundwater systems of the western United States: Evidence from travertine springs and regional He isotope data, by DENNIS L. NEWEll, LAURA J. CROSSEY, KARL E. KARLSTROM, TOBIAS P. FISCHER, AND DAVID R. HILTON, p. 4 Section Meetings: Northeastern, p. 14 Southeastern, p. 20 South-Central, p. 27 le re sab fer e i r d e s n o I u r c e s tectonics, petrology, mantle dynamics, impacts, and syntheses reconcil- Plates, Plumes, and Paradigms ing several branches of earth science. Included are chapters that advocate edited by Gillian R. Foulger, James H. Natland, Dean C. Presnall, the plume model and ones that advocate alternative models. The book and Don L. Anderson will enjoy a long lifetime of usefulness and functions as a reference work for students, scholars, and informed lay people. It is equally valuable This beautiful compendium of work on hotspot volcanism documents the for supporting advanced undergraduate or post-graduate courses and re- development, current state-of-play, and future prospects of all branches search scientists working at the forefront of hotspot science. It is an es- of the subject. It contains extensive and indispensable reference resources sential addition to the bookshelves of every science library, earth science in the form of hotspot, tectonic, volcano and tomographic maps and cross teacher, and research scientist who aspires to understand the frontiers of sections of Earth. Some chapters outline the history of the plume hypoth- this exciting subject. With over 150 color plates, it makes a beautiful ad- esis and other theories for the genesis of hotspots, and several provide tu- dition to the library of anyone fascinated by volcanoes—one of nature’s torials that will be valuable to students and cross-disciplinary scientists. most exciting and extraordinary phenomena. Other chapters present innovative models and theories for individual SPE388, 861 p., plus index, ISBN 0-8137-2388-4. localities, volcano genesis processes, and related global observations. $180.00, member price $144.00 Many of these include subject reviews, making them doubly valuable to specialists and non-specialists alike. The book is fully interdisciplinary, encompassing geophysics, geochemistry, noble gases, heat, temperature, www.geosociety.org/bookstore VOLUME 15, NUMBER 12 DECEMBER 2005 Cover: Active travertine spring mound issuing on the Tierra Amarilla anticline, near San Ysidro, New GSA TODAY publishes news and information for more than Mexico. Photo by Dennis Newell. See 18,000 GSA members and subscribing libraries. GSA Today “Continental-scale links between the lead science articles should present the results of exciting new mantle and groundwater systems of research or summarize and synthesize important problems the western United States: Evidence or issues, and they must be understandable to all in the earth science community. Submit manuscripts to science editors from travertine springs and regional Keith A. Howard, [email protected], or Gerald M. Ross, He isotope data,” by D.L. Newell et [email protected]. al., p. 4–10. GSA TODAY (ISSN 1052-5173 USPS 0456-530) is published 11 times per year, monthly, with a combined April/May issue, by The Geological Society of America, Inc., with offices at 3300 Penrose Place, Boulder, Colorado. Mailing address: P.O. Box 9140, Boulder, CO 80301-9140, USA. Periodicals postage paid at Boulder, Colorado, and at additional mailing offices. Postmaster: Send address changes to GSA Today, GSA Sales and Service, SCIENCE ARTICLE P.O. Box 9140, Boulder, CO 80301-9140. Copyright © 2005, The Geological Society of America, Inc. (GSA). All rights reserved. Copyright not claimed on content prepared 4 Continental-scale links between the mantle and groundwater wholly by U.S. government employees within scope of their systems of the western United States: Evidence from travertine employment. Individual scientists are hereby granted permission, ENNIS EWEll AURA without fees or further requests to GSA, to use a single figure, a springs and regional He isotope data, D L. N , L J. single table, and/or a brief paragraph of text in other subsequent CROSSEY, KARL E. KARLSTROM, TOBIAS P. FISCHER, AND DAVID R. HILTON works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science. For any other use, contact Copyright Permissions, GSA, P.O. Box 9140, Boulder, CO 80301-9140, USA, Fax 303- 357-1073, [email protected]; reference GSA Today, ISSN 12 2006 GSA Annual Meeting in Philadelphia: Call for Proposals 1052-5173. Permission is granted to authors to post the abstracts only of their articles on their own or their organization’s Web site 14 Northeastern Section Meeting: Final Announcement providing the posting includes this reference: “The full paper was published in the Geological Society of America’s journal GSA and Call for Papers Today, [include year, month, and page numbers if known, where the article will appear].” GSA provides this and other forums for 20 Southeastern Section Meeting: Final Announcement the presentation of diverse opinions and positions by scientists worldwide, regardless of their race, citizenship, gender, religion, and Call for Papers or political viewpoint. Opinions presented in this publication do not reflect official positions of the Society. 27 South-Central Section Meeting: Final Announcement SUBSCRIPTIONS for 2005 calendar year: Society Members: and Call for Papers GSA Today is provided as part of membership dues. Contact GSA Sales and Service at 1-888-443-4472, (303) 357-1000, 31 Call for Geological Papers: All 2006 GSA Section Meetings option 3, or [email protected] for membership information. Nonmembers & Institutions: Free with paid 32 Student Mentor Programs: 2006 Section Meetings subscription to both GSA Bulletin and Geology, otherwise $75. Contact Subscription Services at (800) 627-0629 or 33 Upcoming Deadlines [email protected]. Also available on an annual CD-ROM (together with GSA Bulletin, Geology, GSA Data Repository, and Call for Applications: Dwornik Award an Electronic Retrospective Index to journal articles from 1972); 34 $99 to GSA Members, others call GSA Subscription Services for prices and details. Claims: For nonreceipt or for damaged 34 GSA Offers Awards in Geomorphology and Micropaleontology copies, members contact GSA Sales and Service; all others contact Subscription Services. Claims are honored for one year; 35 Coal Division Offers Medlin Scholarship Award please allow sufficient delivery time for overseas copies, up to six months. 36 2004–2005 Congressional Science Fellow Report: GSA Today STAFF: A Category 5 Adventure Executive Director: John W. Hess Science Editors: Keith A. Howard, U.S. Geological Survey, 38 GSA Foundation Update MS 919, Menlo Park, CA 94025, USA, [email protected]; and Gerald M. Ross, Kupa’a Farm, Box 458, Kula, HI 96790, 39 2006 GSA Annual Meeting: Call for Field Trip Proposals [email protected]. Director of Publications: Jon Olsen Managing Editor: Kristen E. Asmus, [email protected] 40 Announcements Editorial Staff: Matt Hudson Production Coordinator: Margo Y. Sajban 41 Short Courses and K–16 Workshops: Call for Proposals Graphics Production: Margo Y. Sajban ADVERTISING: 42 Commentary: Forensic Geomorphology Classifieds & Display: Ann Crawford, 1-800-472-1988, ext. 1053, (303) 357-1053, Fax 303-357-1070; [email protected] 43 GeoCorps America™ 2006 GSA ONLINE: www.geosociety.org 46 Classified Advertising Printed in the USA using pure soy inks. 53 Journal Highlights 54 GeoMart Geoscience Directory 50% Total Recovered Fiber 10% Postconsumer melt likely occurred in several episodes since the Proterozoic Continental-scale links (Karlstrom et al., 2005). The mantle was hydrated by flat-slab subduction during the Laramide orogeny (Humphreys et al., between the mantle and 2003) and now is partially molten, leading to small-scale con- vective exchange between an upwelling asthenosphere (Gao et groundwater systems of al., 2004) and compositionally variable lithosphere (Dueker et al., 2001; Karlstrom et al., 2005). The mantle underlying western the western United States: North America is marked by one of the largest known shear wave velocity contrasts on Earth (van der Lee and Nolet, 1997). Evidence from travertine At the continental scale, this transition reflects the heteroge- neous thinning and warming of North America’s lithospheric springs and regional He keel as the plate moved southwest in absolute plate motion in the Cenozoic into a wide zone of warm asthenosphere (CD- isotope data ROM Working Group, 2002). We hypothesize that CO2-rich mineral springs and related Dennis L. Newell, Laura J. Crossey, Karl E. Karlstrom, Tobias travertine deposits in the western United States are a manifes- P. Fischer, Dept. of Earth and Planetary Sciences, University of tation of this mantle tectonism, and hence the geochemistry New Mexico, Albuquerque, New Mexico 87131, USA, and of spring waters and gases can be used in conjunction with David R. Hilton, Geosciences Research Division, Scripps geophysical data sets to understand mantle heterogeneity and Institution of Oceanography, La Jolla, California 92093-0244, USA the processes of lithosphere-asthenosphere interaction. We report new water and gas chemistry with associated carbon and helium isotope data in the context of a synthesis of the ABSTRACT existing noble gas isotope chemistry database for western 1 To understand regional mantle degassing, we compiled North America. Our literature synthesis (Table DR1 ) builds new and existing helium isotope data measured in hot on previous work in the area, with the regional helium iso- springs, gas fields, and travertine-depositing cool springs and tope data presented in the context of a tomographic image compared these geochemical data with mantle velocity struc- of today’s mantle. We also show that travertine-depositing ture determined from tomographic studies.
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