Richard Doell Was a Kind and Gentle Man of Many Talents
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Is Earth's Magnetic Field Reversing? ⁎ Catherine Constable A, , Monika Korte B
Earth and Planetary Science Letters 246 (2006) 1–16 www.elsevier.com/locate/epsl Frontiers Is Earth's magnetic field reversing? ⁎ Catherine Constable a, , Monika Korte b a Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093-0225, USA b GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany Received 7 October 2005; received in revised form 21 March 2006; accepted 23 March 2006 Editor: A.N. Halliday Abstract Earth's dipole field has been diminishing in strength since the first systematic observations of field intensity were made in the mid nineteenth century. This has led to speculation that the geomagnetic field might now be in the early stages of a reversal. In the longer term context of paleomagnetic observations it is found that for the current reversal rate and expected statistical variability in polarity interval length an interval as long as the ongoing 0.78 Myr Brunhes polarity interval is to be expected with a probability of less than 0.15, and the preferred probability estimates range from 0.06 to 0.08. These rather low odds might be used to infer that the next reversal is overdue, but the assessment is limited by the statistical treatment of reversals as point processes. Recent paleofield observations combined with insights derived from field modeling and numerical geodynamo simulations suggest that a reversal is not imminent. The current value of the dipole moment remains high compared with the average throughout the ongoing 0.78 Myr Brunhes polarity interval; the present rate of change in Earth's dipole strength is not anomalous compared with rates of change for the past 7 kyr; furthermore there is evidence that the field has been stronger on average during the Brunhes than for the past 160 Ma, and that high average field values are associated with longer polarity chrons. -
39. Paleomagnetic Results from Early Tertiary/Late Cretaceous Sediments of Site 384
39. PALEOMAGNETIC RESULTS FROM EARLY TERTIARY/LATE CRETACEOUS SEDIMENTS OF SITE 384 P. A. Larson and N. D. Opdyke, Lamont-Doherty Geological Observatory, Palisades, New York ABSTRACT Magnetic measurements were made on samples taken from the region of the Tertiary/Cretaceous boundary at Site 384. We had hoped that the magnetic stratigraphy of this section could be used to independently substantiate the magnetic stratigraphy of a section of the same age at Gubbio, Italy. Although an attempt has been made to correlate the two sections, the quality of the magnetic data is too poor either to confirm or deny the Gubbio results. INTRODUCTION inclination for this section of Site 384 should lie be¬ tween 46° and 58°. This range of inclinations is indi¬ A type section for the Late Cretaceous-Paleocene cated by the two stippled bands on the plot in Figure portion of the geomagnetic reversal time scale has been 2. As can seen in the figure, the actual inclination val¬ proposed recently from studies of the pelagic limestone ues are considerably scattered. The normally magnet¬ sequence at Gubbio, Italy (Alvarez et al., 1977; Lowrie ized specimens have an average inclination of 43.3° and Alvarez, 1977; Roggenthen and Napoleone, (standard deviation = 19.6°), while the reversely 1977). The upper Maestrichtian-Danian sediments magnetized ones average -24.9° (standard deviation from Site 384 were studied to see whether they would = 22.1°). These averages exclude specimens which fall yield a magnetic stratigraphy correlative to the section within the two hachured zones in the polarity diagram at Gubbio. of Figure 2. -
Annual Meeting & Exposition Annual
Vol. 9, No. 6 June 1999 GSA TODAY A Publication of the Geological Society of America 1999 Annual Meeting & Exposition Colorado ConvenConventiontion CenterCenter HyattHyatt RegencyRegency HotelHotel MarriottMarriott CityCity CenterCenter HotelHotel OctoberOctober 25–28,25–28, 19991999 Denver,Denver, ColoradoColorado Table of Contents Crossing Divides Abstracts with Programs . 32 Convenience Information . 26 Employment Service . 22 World Wide Web Exhibits . 20 Visit the GSA Web site to obtain more details and to get the latest information on the Annual Meeting. Field Trips . 13 www.geosociety.org Graduate School Information Forum . 23 Guest Activities . 24 Deadlines Hot Topics at Noon . 9 Abstracts due July 12 Housing . 28 Preregistration and Housing due September 17 (forms(forms enclosed)enclosed) How to Submit Your Abstract . 12 Institute for Earth Science and the Environment . 22 For More Information Call: (303) 447-2020 or 1-800-472-1988 International Program . 6 Call: (303) 447-2020 or 1-800-472-1988 Fax: 303-447-0648 K–16 Education Program . 18 E-mail: [email protected] Membership . 30 Web: www.geosociety.org Registration . 30 Short Courses . 16 Cover photos by John A. Karachewski: Large photo shows the Special Events . 23 Continental Divide—Sawatch Range, Collegiate Peaks Wilderness, Special Programs . 22 Colorado; small photo taken near James Peak, Colorado Technical Program . 3 Travel . 25 Crossing Divides Annual Meeting Committee General Co-Chairs: Mary Kraus, David Budd, University of Colorado Technical Program Co-Chairs: -
Recommendations and Guidelines, the Incorporation of Results of Current Crustal Evolution Studies Into K-12 Curricula
DOCUMENT RESUME 1D 104 664 SE 018 772 AUTHOR Stoever, Edward C., Jr. TITLE Recommendations and Guidelines, The Incorporation of Results of Current Crustal Evolution Studies into K-12 Curricula. A Report of the National Association of Geology Teachers Conference on K-12 Crustal Evolution EducatioL (Western Hilli State-Lodge, Oklahoma, September 16-18, 1974) . INSTITUTION National Association of Geology Teachers. SPONS AGENCY National Science Poundation, Washington, D.C. PUB DATE Jan 75 NOTE 53p. EDRS PRICE NF -$0.76 HC-$3.32 PLUS POSTAGE DESCRIPTORS Conference Reports; *Curriculum Development; Curriculum Guides; *Earth Science; Elementary Education; Elementary Secondary Education; Geology; *Science Education; Secondary Education; Teaching Guides ABSTRACT The National Association of Geology Teachers (NAGT) .conducted an assessment of -the impliCations of current-studies encompassing the theories of continental drift, polar wandering, sea-floor spreading, and plate tectonics to K-12 education, and presented in this document recommendation's for the incorporation of these concepts into school curricula. A detailed description of tie. current status of crustal evolution " studies is presented. Conclusions drawn at the conference indicate the desirability of incorporation of -these topics, as well as the feasibility of the incorporation. Recommendations show grades six through ten as primary targets. An organizational scheme is presented, as are charts shoving how new information, ideas, and materials would be processed for classroom use. Suggestions for preparatibn of curriculum materials and introductory teacher materials are suggested.- The appendices include a list of conference participants, a pre-conference report,an exaiple of-a lesson activity, suggested lesson activity topics, and suggested teacher resource book contents. -
A Geochemist in His Garden of Eden
A GEOCHEMIST IN HIS GARDEN OF EDEN WALLY BROECKER 2016 ELDIGIO PRESS Table of Contents Chapter 1 Pages Introduction ................................................................................................................. 1-13 Chapter 2 Paul Gast and Larry Kulp ......................................................................................... 14-33 Chapter 3 Phil Orr...................................................................................................................... 34-49 Chapter 4 230Th Dating .............................................................................................................. 50-61 Chapter 5 Mono Lake ................................................................................................................ 62-77 Chapter 6 Bahama Banks .......................................................................................................... 78-92 Chapter 7 Doc Ewing and his Vema ........................................................................................ 93-110 Chapter 8 Heezen and Ewing ................................................................................................ 111-121 Chapter 9 GEOSECS ............................................................................................................. 122-138 Chapter 10 The Experimental Lakes Area .............................................................................. 139-151 Table of Contents Chapter 11 Sea Salt ................................................................................................................. -
Constraining in Situ Cosmogenic Nuclide Paleo-Production Rates Using Sequential Lava flows During a Paleomagnetic field Strength Low
Journal Pre-proof Constraining in situ cosmogenic nuclide paleo-production rates using sequential lava flows during a paleomagnetic field strength low A.M. Balbas, K.A. Farley PII: S0009-2541(19)30484-X DOI: https://doi.org/10.1016/j.chemgeo.2019.119355 Reference: CHEMGE 119355 To appear in: Received Date: 6 August 2019 Revised Date: 26 September 2019 Accepted Date: 31 October 2019 Please cite this article as: Balbas AM, Farley KA, Constraining in situ cosmogenic nuclide paleo-production rates using sequential lava flows during a paleomagnetic field strength low, Chemical Geology (2019), doi: https://doi.org/10.1016/j.chemgeo.2019.119355 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2019 Published by Elsevier. 1 Constraining in situ cosmogenic nuclide paleo-production rates using sequential lava flows during a paleomagnetic field strength low A.M. Balbas1,2*, K.A. Farley2 1 College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA 2Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA * Corresponding author: [email protected] Abstract The geomagnetic field prevents a portion of incoming cosmic rays from reaching Earth’s atmosphere. -
Stanley Keith Runcorn FRS (1922-1995)
Catalogue of the papers and correspondence of Stanley Keith Runcorn FRS (1922-1995) VOLUME 11 Section G: Societies and organisations by Timothy E. Powell and Caroline Thibeaud NCUACS catalogue no. 104/3/02 S.K. Runcorn 124 NCUACS 104/3/02 SECTION G SOCIETIES AND ORGANISATIONS G.1-G.732 G.1 ACADEMIA EUROPAEA G.2-G.6 AMERICAN GEOPHYSICAL UNION G.7-G.11 BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE G.12-G.63 COSPAR (COMMITTEE ON SPACE RESEARCH) G.64-G.67 DEPARTMENT OF ENERGY: ENERGY TECHNOLOGY SUPPORT UNIT G.68-G.76 EUROPEAN GEOPHYSICAL SOCIETY G.77 EUROPEAN PLANETARY GEOLOGY CONSORTIUM G.78-G.111 EUROPEAN SCIENCE FOUNDATION G.112-G.1S3 EUROPEAN SPACE AGENCY G.1S4-G.230 INTERNATIONAL ASTRONOMICAL UNION G.231-G.277 INTERNATIONAL UNION OF GEODESY AND GEOPHYSICS G.278 INTERNATIONAL UNION OF GEOLOGICAL SCIENCES G.279-G.294 INTER-UNION COMMISSION FOR STUDIES OF THE MOON G .29S-G .300 JOINT SERVICES WEST-EAST SAHARA EXPEDITION G.301, G.302 LIBERAL PARTY G.303-G.311 LUNAR SCIENCE INSTITUTE S.K. Runcorn 125 NCUACS 104/3/02 Societies and organisations G.312 METEORITICAL SOCIETY G.313 MINERALOLOGICAL SOCIETY G.314-G.319 MINISTRY OF SUPPLY G.320 MUSEUM OF NORTHERN ARIZONA G.321-G.333 NATIONAL AERONAUTICS AND SPACE ADMINISTRATION (NASA) G.334-G.338 NATIONAL SCIENCE FOUNDATION G.339-G.342 NORTH ATLANTIC TREATY ORGANISATION (NATO) G.343 NUFFIELD FOUNDATION G.344-G.365 POI\ITIFICAL ACADEMY OF SCIENCES G.366 PROVINCIAAL UTRECHTS GENOOTSCHAP VAN KUISTEN EN WETENSCHAPPEN G.367-G.386 ROYAL ASTRONOMICAL SOCIETY G.387-G.731 ROYAL SOCIETY G.732 STANDING CONFERENCE OF PROFESSORS OF PHYSICS S.K. -
GEOLOGY THEME STUDY Page 1
NATIONAL HISTORIC LANDMARKS Dr. Harry A. Butowsky GEOLOGY THEME STUDY Page 1 Geology National Historic Landmark Theme Study (Draft 1990) Introduction by Dr. Harry A. Butowsky Historian, History Division National Park Service, Washington, DC The Geology National Historic Landmark Theme Study represents the second phase of the National Park Service's thematic study of the history of American science. Phase one of this study, Astronomy and Astrophysics: A National Historic Landmark Theme Study was completed in l989. Subsequent phases of the science theme study will include the disciplines of biology, chemistry, mathematics, physics and other related sciences. The Science Theme Study is being completed by the National Historic Landmarks Survey of the National Park Service in compliance with the requirements of the Historic Sites Act of l935. The Historic Sites Act established "a national policy to preserve for public use historic sites, buildings and objects of national significance for the inspiration and benefit of the American people." Under the terms of the Act, the service is required to survey, study, protect, preserve, maintain, or operate nationally significant historic buildings, sites & objects. The National Historic Landmarks Survey of the National Park Service is charged with the responsibility of identifying America's nationally significant historic property. The survey meets this obligation through a comprehensive process involving thematic study of the facets of American History. In recent years, the survey has completed National Historic Landmark theme studies on topics as diverse as the American space program, World War II in the Pacific, the US Constitution, recreation in the United States and architecture in the National Parks. -
Re-Examining the Evidence for Cycles in Magnetic Reversal Rate
Does the Planetary Dynamo Go Cycling On? Re-examining the Evidence for Cycles in Magnetic Reversal Rate Adrian L. Melott1, Anthony Pivarunas2, Joseph G. Meert2, Bruce S. Lieberman3 1University of Kansas, Department of Physics and Astronomy, Lawrence, KS, 66045; [email protected]; 785-864-3037 2University of Florida, Department of Geological Sciences, 241 Williamson Hall, Gainesville, FL 32611 3University of Kansas, Department of Ecology & Evolutionary Biology and Biodiversity Institute, 1345 Jayhawk Blvd., Lawrence, KS 66045 1 Abstract The record of reversals of the geomagnetic field has played an integral role in the development of plate tectonic theory. Statistical analyses of the reversal record are aimed at detailing patterns and linking those patterns to core-mantle processes. The geomagnetic polarity timescale is a dynamic record and new paleomagnetic and geochronologic data provide additional detail. In this paper, we examine the periodicity revealed in the reversal record back to 375 million years ago (Ma) using Fourier analysis. Four significant peaks were found in the reversal power spectra within the 16-40-million-year range (Myr). Plotting the function constructed from the sum of the frequencies of the proximal peaks yield a transient 26 Myr periodicity, suggesting chaotic motion with a periodic attractor. The possible 16 Myr periodicity, a previously recognized result, may be correlated with ‘pulsation’ of mantle plumes and perhaps; more tentatively, with core-mantle dynamics originating near the large low shear velocity layers in the Pacific and Africa. Planetary magnetic fields shield against charged particles which can give rise to radiation at the surface and ionize the atmosphere, which is a loss mechanism particularly relevant to M stars. -
SCIENCE and SUSTAINABILITY Impacts of Scientific Knowledge and Technology on Human Society and Its Environment
EM AD IA C S A C I A E PONTIFICIAE ACADEMIAE SCIENTIARVM ACTA 24 I N C T I I F A I R T V N Edited by Werner Arber M O P Joachim von Braun Marcelo Sánchez Sorondo SCIENCE and SUSTAINABILITY Impacts of Scientific Knowledge and Technology on Human Society and Its Environment Plenary Session | 25-29 November 2016 Casina Pio IV | Vatican City LIBRERIA EDITRICE VATICANA VATICAN CITY 2020 Science and Sustainability. Impacts of Scientific Knowledge and Technology on Human Society and its Environment Pontificiae Academiae Scientiarvm Acta 24 The Proceedings of the Plenary Session on Science and Sustainability. Impacts of Scientific Knowledge and Technology on Human Society and its Environment 25-29 November 2016 Edited by Werner Arber Joachim von Braun Marcelo Sánchez Sorondo EX AEDIBVS ACADEMICIS IN CIVITATE VATICANA • MMXX The Pontifical Academy of Sciences Casina Pio IV, 00120 Vatican City Tel: +39 0669883195 • Fax: +39 0669885218 Email: [email protected] • Website: www.pas.va The opinions expressed with absolute freedom during the presentation of the papers of this meeting, although published by the Academy, represent only the points of view of the participants and not those of the Academy. ISBN 978-88-7761-113-0 © Copyright 2020 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form, or by any means, electronic, mechanical, recording, pho- tocopying or otherwise without the expressed written permission of the publisher. PONTIFICIA ACADEMIA SCIENTIARVM LIBRERIA EDITRICE VATICANA VATICAN CITY The climate is a common good, belonging to all and meant for all. -
The Relative Stabilities of the Reverse and Normal Polarity States of the Earth's Magnetic Field
Earth and Planetary Science Letters, 82 (1987) 373 383 373 Elsevier Science Publishers B.V., Amsterdam Printed in The Netherlands [51 The relative stabilities of the reverse and normal polarity states of the earth's magnetic field P.L. McFadden 1, R.T. Merrill 2, William Lowrie 3 and Dennis V. Kent 4 t Division of Geophysics, Bureau of Mineral Resources, G.P.O. Box 378, Canberra, A. C. 72 2601 (Australia) : Geophysics Program, University of Washington, Seattle, WA 98195 (U.S.A.) 3 Institut fiir Geophysik, E. 72 H. -Hfnggerberg, CH-8093 Ziirich (Switzerland) 4 Lamont-Dohertv Geological Observatory, and Department of Geological Sciences, Palisades, N Y 10964 (U.S.A.) Received August 22, 1986; revised version received December 16, 1986 Recent analyses of the geomagnetic reversal sequence have led to different conclusions regarding the important question of whether there is a discernible difference between the properties of the two polarity states. The main differences between the two most recent studies are the statistical analyses and the possibility of an additional 57 reversal events in the Cenozoic. These additional events occur predominantly during reverse polarity time, but it is unlikely that all of them represent true reversal events. Nevertheless the question of the relative stabilities of the polarity states is examined in detail, both for the case when all 57 "events" are included in the reversal chronology and when they are all excluded. It is found that there is not a discernible difference between the stabilities of the two polarity states in either case. Inclusion of these short events does, however, change the structure of the non-stationarity in reversal rate, but still allows a smooth non-stationarity. -
The Historical Record in the Scaglia Limestone at Gubbio: Magnetic Reversals and the Cretaceous-Tertiary Mass Extinction
Sedimentology (2009) 56, 137Ð148 doi: 10.1111/j.1365-3091.2008.01010.x The historical record in the Scaglia limestone at Gubbio: magnetic reversals and the Cretaceous-Tertiary mass extinction WALTER ALVAREZ Department of Earth and Planetary Science, University of California, Berkeley, CA 94720-4767, USA (E-mail: [email protected]) ABSTRACT The Scaglia limestone in the Umbria-Marche Apennines, well-exposed in the Gubbio area, offered an unusual opportunity to stratigraphers. It is a deep- water limestone carrying an unparalleled historical record of the Late Cretaceous and Palaeogene, undisturbed by erosional gaps. The Scaglia is a pelagic sediment largely composed of calcareous plankton (calcareous nannofossils and planktonic foraminifera), the best available tool for dating and long-distance correlation. In the 1970s it was recognized that these pelagic limestones carry a record of the reversals of the magnetic field. Abundant planktonic foraminifera made it possible to date the reversals from 80 to 50 Ma, and subsequent studies of related pelagic limestones allowed the micropalaeontological calibration of more than 100 Myr of geomagnetic polarity stratigraphy, from ca 137 to ca 23 Ma. Some parts of the section also contain datable volcanic ash layers, allowing numerical age calibration of the reversal and micropalaeontological time scales. The reversal sequence determined from the Italian pelagic limestones was used to date the marine magnetic anomaly sequence, thus putting ages on the reconstructed maps of continental positions since the breakup of Pangaea. The Gubbio Scaglia also contains an apparently continuous record across the CretaceousÐTertiary boundary, which was thought in the 1970s to be marked everywhere in the world by a hiatus.