DOCSLIB.ORG

Diamond Resorption Morphology As a Fluid Proxy in Diamond- Bearing Environments: Constraints from Empirical and Experimental Studies

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Diamond Resorption Morphology As a Fluid Proxy in Diamond- Bearing Environments: Constraints from Empirical and Experimental Studies DIAMOND RESORPTION MORPHOLOGY AS A FLUID PROXY IN DIAMOND- BEARING ENVIRONMENTS: CONSTRAINTS FROM EMPIRICAL AND EXPERIMENTAL STUDIES by Zhihai Zhang Submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy at Dalhousie University Halifax, Nova Scotia March 2016 © Copyright by Zhihai Zhang, 2016 TABLE OF CONTENTS LIST OF TABLES ......................................................................................................... vii LIST OF FIGURES ...................................................................................................... viii ABSTRACT ................................................................................................................. xii LIST OF ABBREVIATIONS AND SYMBOLS USED ............................................ xiii ACKNOWLEDGEMENTS ......................................................................................... xvi CHAPTER 1. INTRODUCTION ....................................................................................1 1.1. Diamond Resorption Morphology ......................................................................1 1.1.1. Classification of Diamonds .....................................................................1 1.1.2. Diamond Resorption Morphology ..........................................................4 1.1.3. Diamond Dissolution ..............................................................................8 1.1.4. Diamond Resorption Morphology as a Potential Fluid Proxy ..............13 1.2. Diamondiferous Kimberlites in the Ekati Mine ................................................16 1.2.1. Geology of the Ekati Kimberlites .........................................................16 1.2.2. Volatiles in Kimberlites .........................................................................22 1.2.3. Kimberlite Emplacement Models .........................................................23 1.3. Lithospheric Mantle beneath the Central Slave Craton ....................................27 1.3.1. General Structure of Lithospheric Mantle ............................................27 1.3.2. Volatiles in Mantle Metasomatism ........................................................29 1.4. Objectives and Thesis Structure ........................................................................31 CHAPTER 2. MANTLE-DERIVED MORPHOLOGY OF DIAMOND: RECORDS OF DIAMOND-DESTROYING MANTLE METASOMATISM IN THE SLAVE CRATON ................................37 2.1. Preface...............................................................................................................37 2.2. Abstract .............................................................................................................37 2.3. Introduction .......................................................................................................39 ii 2.4. Samples and Analytical Methods ......................................................................41 2.5. Results ...............................................................................................................43 2.5.1. Morphological Grouping ......................................................................43 2.5.2. Internal Texture .....................................................................................48 2.5.3. Nitrogen Content and Aggregation State ..............................................51 2.6. Discussion .........................................................................................................56 2.6.1. Relationship between Diamond Morphology and Internal Properties ..56 2.6.2. Resorption-based Classification............................................................58 2.6.3. Diamondiferous Sectors and Their Resorption Morphology ................59 2.6.4. Diamond-destroying Metasomatism in the Slave Craton .....................65 2.7. Conclusions .......................................................................................................66 2.8. Acknowledgements ...........................................................................................67 CHAPTER 3. DIAMOND RESORPTION IN THE MANTLE: A STUDY OF INTERNAL STRUCTURES, Δ13C AND N CONTENTS IN DIAMONDS FROM THE EKATI MINE, CANADA ........................68 3.1. Preface...............................................................................................................68 3.2. Introduction .......................................................................................................68 3.3. Geological background .....................................................................................75 3.4. Analytical Methods ...........................................................................................78 3.5. Results ...............................................................................................................81 3.5.1. Internal Structures and Corresponding Forms ......................................81 3.5.2. Carbon Isotopic Compositions of Diamonds ........................................87 3.5.3. N Contents in Diamonds .......................................................................91 3.5.4. Correlation between δ13C and N Contents of Diamonds ......................95 3.6. Summary ...........................................................................................................97 CHAPTER 4. EVOLUTION OF DIAMOND RESORPTION IN A SILICIC AQUEOUS FLUID AT 1-3 GPA: APPLICATION TO KIMBERLITE EMPLACEMENT AND MANTLE METASOMATISM ................................................................................99 iii 4.1. Preface...............................................................................................................99 4.2. Abstract .............................................................................................................99 4.3. Introduction .....................................................................................................101 4.4. Experimental and Analytical Methods ............................................................106 4.5. Results ............................................................................................................. 114 4.5.1. Synthetic Fluid Inclusions in Olivine ................................................. 114 4.5.2. Pressure Effect on Diamond Oxidation Kinetics ................................ 119 4.5.3. Diamond resorption morphology ........................................................121 4.5.3.1. Crystal Morphological Transformation .....................................121 4.5.3.2. Surface Features and Geometry of Trigonal Pits.......................124 4.5.3.3. Evolution of Trigonal Pits .........................................................128 4.5.3.4. Circular Pits ...............................................................................131 4.6. Discussion .......................................................................................................131 4.6.1. Factors Determining Diamond Resorption in Silicic Aqueous Fluids 131 4.6.2. Model of trigon formation ..................................................................134 4.6.3. Diamond Resorption in the Ekati Mine Kimberlites ..........................141 4.6.4. Metasomatism under the Central Slave Craton ..................................145 4.7. Conclusions .....................................................................................................146 4.8. Acknowledgments ...........................................................................................146 CHAPTER 5. P-X EFFECTS ON DIAMOND RESORPTION: EXPERIMENTAL CONSTRAINTS .................................................148 5.1. Preface.............................................................................................................148 5.2. Abstract ...........................................................................................................148 5.3. Introduction .....................................................................................................150 5.4. Experimental and Analytical Methods ............................................................154 5.5. Results .............................................................................................................161 5.5.1. C-O-H Fluids in Experiments .............................................................161 5.5.1.1. Immiscible C-O-H Fluids with the Subsolidus Matrix .............161 5.5.1.2. Compositions of the Aqueous and Carbonic End Members......167 iv 5.5.1.3. Formation of Fluid Inclusions ...................................................169 5.5.1.4. CO2-saturated Melts ..................................................................171 5.5.2. Diamond Dissolution ..........................................................................171 5.5.2.1. Diamond Dissolution Rates .......................................................171 5.5.2.2. Transformation of the Diamond Forms .....................................175 5.5.2.3. Surface Features on the Etched Diamonds ................................177 5.6. Discussion .......................................................................................................187 5.6.1. Immiscibility of the Binary CO2-H2O System ....................................187 5.6.2. Diamond Resorption Morphology as a Semi-quantitative Fluid Proxy ...................................................................................................189 5.6.3. What Controls the Geometry of Etch Pits on Diamond ......................195
Load more

Recommended publications
  • Imaginative Geographies of Mars: the Science and Significance of the Red Planet, 1877 - 1910
    Copyright by Kristina Maria Doyle Lane 2006 The Dissertation Committee for Kristina Maria Doyle Lane Certifies that this is the approved version of the following dissertation: IMAGINATIVE GEOGRAPHIES OF MARS: THE SCIENCE AND SIGNIFICANCE OF THE RED PLANET, 1877 - 1910 Committee: Ian R. Manners, Supervisor Kelley A. Crews-Meyer Diana K. Davis Roger Hart Steven D. Hoelscher Imaginative Geographies of Mars: The Science and Significance of the Red Planet, 1877 - 1910 by Kristina Maria Doyle Lane, B.A.; M.S.C.R.P. Dissertation Presented to the Faculty of the Graduate School of The University of Texas at Austin in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy The University of Texas at Austin August 2006 Dedication This dissertation is dedicated to Magdalena Maria Kost, who probably never would have understood why it had to be written and certainly would not have wanted to read it, but who would have been very proud nonetheless. Acknowledgments This dissertation would have been impossible without the assistance of many extremely capable and accommodating professionals. For patiently guiding me in the early research phases and then responding to countless followup email messages, I would like to thank Antoinette Beiser and Marty Hecht of the Lowell Observatory Library and Archives at Flagstaff. For introducing me to the many treasures held deep underground in our nation’s capital, I would like to thank Pam VanEe and Ed Redmond of the Geography and Map Division of the Library of Congress in Washington, D.C. For welcoming me during two brief but productive visits to the most beautiful library I have seen, I thank Brenda Corbin and Gregory Shelton of the U.S.
    [Show full text]
  • North Carolina Obituaries Courier Tribune Name Date of Paper Page # Date of Death Abbott, Blannie Allen 7-Aug-84 7A 6-Aug-84
    North Carolina Obituaries Courier Tribune Name Date of Paper Page # Date of Death Abbott, Blannie Allen 7-Aug-84 7A 6-Aug-84 Abbott, Douglas L. 1-Sep-82 12A 30-Aug-82 Abbott, Helen Hartsook 3-Dec-82 9A 2-Dec-82 Abbott, Molly Jeane 3-Nov-81 8A 31-Oct-81 Abbott, Nora Johnson Mitchell 14-Oct-83 12A 13-Oct-83 Abbott, Roger 1-Aug-84 6A 31-Jul-84 Abercrombie, Dodd 5-Oct-80 6A 3-Oct-80 Abernathy, Ray Paul 29-Jun-80 8A 28-Jun-80 Abernathy, Shaun Travis 24-May-83 8A 24-May-83 Abrams, Reagan Vincent 28-Sep-80 6A 26-Sep-80 Abston, Thomas Earl 30-Dec-82 10A 29-Dec-82 Ackerman, Elsie K. 20-Apr-82 8A 19-Apr-82 Acree, Una Mae Phillips 6-Jul-81 6A 5-Jul-81 Adams, Anna Threadgill 9-Dec-85 9A 8-Dec-85 Adams, Annie Vaughn 12-Mar-85 6A 11-Mar-85 Adams, Bernice Hooper 6-Jul-82 8A 5-Jul-82 Adams, Dora Carrick 13-Jun-80 10A 12-Jun-80 Adams, Edward Vance 23-May-83 6A 23-May-83 Adams, Herman Hugh Sr. 29-Oct-81 8A 27-Oct-81 Adams, James Clifton 18-Sep-84 9A 17-Sep-84 Adams, John Edwin 1-Mar-84 10A 29-Feb-84 Adams, T.B. 15-Oct-82 10A 14-Oct-82 Adams, Velma D. 11-Aug-81 8A 10-Aug-81 Adcock, Plackard C. 6-Jul-82 8A 5-Jul-82 Aderholt, Daniel H. 17-May-85 10A 13-May-85 Adkins, Clarence Odell 1-Jan-85 7A 1-Jan-85 Adkins, E.G.
    [Show full text]
  • GSA TODAY Conference, P
    Vol. 10, No. 2 February 2000 INSIDE • GSA and Subaru, p. 10 • Terrane Accretion Penrose GSA TODAY Conference, p. 11 A Publication of the Geological Society of America • 1999 Presidential Address, p. 24 Continental Growth, Preservation, and Modification in Southern Africa R. W. Carlson, F. R. Boyd, S. B. Shirey, P. E. Janney, Carnegie Institution of Washington, 5241 Broad Branch Road, N.W., Washington, D.C. 20015, USA, [email protected] T. L. Grove, S. A. Bowring, M. D. Schmitz, J. C. Dann, Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA D. R. Bell, J. J. Gurney, S. H. Richardson, M. Tredoux, A. H. Menzies, Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa D. G. Pearson, Department of Geological Sciences, Durham University, South Road, Durham, DH1 3LE, UK R. J. Hart, Schonland Research Center, University of Witwater- srand, P.O. Box 3, Wits 2050, South Africa A. H. Wilson, Department of Geology, University of Natal, Durban, South Africa D. Moser, Geology and Geophysics Department, University of Utah, Salt Lake City, UT 84112-0111, USA ABSTRACT To understand the origin, modification, and preserva- tion of continents on Earth, a multidisciplinary study is examining the crust and upper mantle of southern Africa. Xenoliths of the mantle brought to the surface by kimber- lites show that the mantle beneath the Archean Kaapvaal Figure 2. Bouguer gravity image (courtesy of South African Council for Geosciences) craton is mostly melt-depleted peridotite with melt extrac- across Vredefort impact structure, South Africa. Color scale is in relative units repre- senting total gravity variation of 90 mgal across area of figure.
    [Show full text]
  • Lick Observatory Records: Photographs UA.036.Ser.07
    http://oac.cdlib.org/findaid/ark:/13030/c81z4932 Online items available Lick Observatory Records: Photographs UA.036.Ser.07 Kate Dundon, Alix Norton, Maureen Carey, Christine Turk, Alex Moore University of California, Santa Cruz 2016 1156 High Street Santa Cruz 95064 [email protected] URL: http://guides.library.ucsc.edu/speccoll Lick Observatory Records: UA.036.Ser.07 1 Photographs UA.036.Ser.07 Contributing Institution: University of California, Santa Cruz Title: Lick Observatory Records: Photographs Creator: Lick Observatory Identifier/Call Number: UA.036.Ser.07 Physical Description: 101.62 Linear Feet127 boxes Date (inclusive): circa 1870-2002 Language of Material: English . https://n2t.net/ark:/38305/f19c6wg4 Conditions Governing Access Collection is open for research. Conditions Governing Use Property rights for this collection reside with the University of California. Literary rights, including copyright, are retained by the creators and their heirs. The publication or use of any work protected by copyright beyond that allowed by fair use for research or educational purposes requires written permission from the copyright owner. Responsibility for obtaining permissions, and for any use rests exclusively with the user. Preferred Citation Lick Observatory Records: Photographs. UA36 Ser.7. Special Collections and Archives, University Library, University of California, Santa Cruz. Alternative Format Available Images from this collection are available through UCSC Library Digital Collections. Historical note These photographs were produced or collected by Lick observatory staff and faculty, as well as UCSC Library personnel. Many of the early photographs of the major instruments and Observatory buildings were taken by Henry E. Matthews, who served as secretary to the Lick Trust during the planning and construction of the Observatory.
    [Show full text]
  • 0 Lunar and Planetary Institute Provided by the NASA Astrophysics Data System Mare Sereni Tatis Young, R.A
    EVIDENCE FOR A SHALLOW REGIONAL SUBSURFACE DISCOt4TIN- UITY IN SOUTHERN MARE SERENITATIS. R.A. Young, Department of Geological Sciences, SUNY, Geneseo, N.Y. 14454. Several characteristics of south-central Mare Sereni tatis are unique to this basin and indicate that an unusual history may be recorded in the basin fill. Geologic evidence strongly supports a regional discontinuity beginning at depths greater than 40 m below the surface and extending to 250 m depths in some places. The following observations concerning the basin are pertinent to the discussion which follows: 1) The central porti on of Sereni tatis (brownish gray 1avas) represents much younger flooding than that which produced the older flows which ring the basin and form the highly cratered darker annulus of bluish gray lavas and mantling materials. A1 though the brownish gray lavas are approximately equivalent in age to large portions of the Imbrium basin surface (crater counts), most of the mare ridges in Sereni tatis experienced much 1ater growth and deforma- tion as demonstrated by their very sharp morphology and the un- usually large number of postmare craters filled by flows along the ridge flanks. 2) Despite the obvious 2-stage flooding of the basin there are few remnants of old flooded craters or ring structures, indicating either that the late stage filling was relatively deep or that some other deposit covered the surface before the most recent flooding. 3) The overturned strata in the rim flap of Bessel have exposed the bluish gray lavas found beneath the younger brownish gray surface rocks (1). The low depth/diameter ratio for Bessel (0.11) indicates that the con- tact zone must lie at a depth considerably shallower than the 1000 m depth of the crater floor below the surrounding surface.
    [Show full text]
  • Ammolite: Iridescent Fossil Ammonite from Southern Alberta, Canada
    SPRING 2001 VOLUME 37, NO. 1 EDITORIAL 1 The Dr. Edward J. Gübelin Most Valuable Article Award Alice S. Keller FEATURE ARTICLES pg. 5 4 Ammolite: Iridescent Fossilized Ammonite from Southern Alberta, Canada Keith A. Mychaluk, Alfred A. Levinson, and Russell L. Hall pg. 27 A comprehensive report on the history, occurrence, and properties of this vividly iridescent gem material, which is mined from just one area in Canada. 26 Discovery and Mining of the Argyle Diamond Deposit, Australia James E. Shigley, John Chapman, and Robyn K. Ellison Learn about the development of Australia’s first major diamond mine, the world’s largest source of diamonds by volume. 42 Hydrothermal Synthetic Red Beryl from the Institute of Crystallography, Moscow James E. Shigley, Shane F. McClure, Jo Ellen Cole, John I. Koivula, Taijin Lu, Shane Elen, and Ludmila N. Demianets pg. 43 Grown to mimic the beautiful red beryl from Utah, this synthetic can be identified by its internal growth zoning, chemistry, and spectral features. REGULAR FEATURES 56 Gem Trade Lab Notes • Unusual andradite garnet • Synthetic apatite • Beryl-and-glass triplet imitating emerald • Diamond with hidden cloud • Diamond with pseudo- dichroism • Surface features of synthetic diamond • Musgravite • Five- strand natural pastel pearl necklace • Dyed quartzite imitation of jadeite 64 Gem News International • White House conference on “conflict” diamonds • Tucson 2000: GIA’s diamond cut research • California cultured abalone pearls • Benitoite mine sold • Emeralds from Laghman, Afghanistan • Emeralds from Piteiras, Brazil • Educational iolite • “Hte Long Sein” jadeite • Kunzite from Nigeria • “Rainbow” obsidian • New production of Indonesian opal • Australian prehnite • “Yosemite” topaz • Tourmaline from northern Pakistan • A 23.23 ct tsavorite • TGMS highlights • Vesuvianite from California • Opal imitations • Green flame-fusion synthetic sapphire • Platinum coating of drusy materials • Gem display • Micromosaics 79 2001 Gems & Gemology Challenge 81 Book Reviews 83 Gemological Abstracts pg.
    [Show full text]
  • Water in Evolved Lunar Rocks a Dissertation Submitted To
    WATER IN EVOLVED LUNAR ROCKS A DISSERTATION SUBMITTED TO THE GRADUATE DIVISION OF THE UNIVERSITY OF HAWAIʻI AT MĀNOA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY IN GEOLOGY AND GEOPHYSICS MAY 2015 By Katharine Lynn Robinson Dissertation Committee: G. Jeffrey Taylor, Chairperson Gary R. Huss Kazuhide Nagashima Eric Hellebrand Michael J. Mottl Keywords: Moon; Lunar water; Evolved rocks; Hydrogen isotopes; Felsites; Lunar evolution ACKNOWLEDGEMENTS This research was supported by the National Aeronautics and Space Administration through the NASA Astrobiology Institute under Cooperative Agreement No. NNA09DA77A issued through the Office of Space Science, and by NASA Lunar Advanced Science and Exploration Research Grants NNX11AE85G and NNX08AY88G to G. Jeffrey Taylor. I also received funding from the Fred M. Bullard Graduate Fellowship and Subagreement No. 02235-03 on Award number NNA14AB07A (NASA SSERVI). On a more personal note, I would like to thank my advisor, Jeff Taylor, for being an amazing boss, teacher, and co-author for the past four-odd years. None of this work would have been possible without Jeff, and only Jeff could have made it so much fun. I also thank my past advisors, Albert Colman and Allan Treiman, for teaching me the fundamentals of research and helping me get my foot in the planetary geology door. The Grad Family at large is too numerous to thank individually, but thanks, everyone, for being my surrogate island family. Special thanks to Sarah Crites, Sarah Maher, and Lydia Baker for all the fun, beach days, hugs, and hand- holding through all the usual grad student milestones: quals, comps, conference presentations, and finally, the dissertation defense.
    [Show full text]
  • Worlds Apart: How the Distance Between Science and Journalism Threatens America's Future
    Worlds Apart Worlds Apart HOW THE DISTANCE BETWEEN SCIENCE AND JOURNALISM THREATENS AMERICA’S FUTURE JIM HARTZ AND RICK CHAPPELL, PH.D. iv Worlds Apart: How the Distance Between Science and Journalism Threatens America’s Future By Jim Hartz and Rick Chappell, Ph.D. ©1997 First Amendment Center 1207 18th Avenue South Nashville, TN 37212 (615) 321-9588 www.freedomforum.org Editor: Natilee Duning Designer: David Smith Publication: #98-F02 To order: 1-800-830-3733 Contents Foreword vii Scientists Needn’t Take Themselves Seriously To Do Serious Science 39 Introduction ix Concise writing 40 Talk to the customers 41 Overview xi An end to infighting 42 The incremental nature of science 43 The Unscientific Americans 1 Scientific Publishing 44 Serious omissions 2 Science and the Fourth Estate 47 The U.S. science establishment 4 Public disillusionment 48 Looking ahead at falling behind 5 Spreading tabloidization 48 Out of sight, out of money 7 v Is anybody there? 8 Unprepared but interested 50 The regional press 50 The 7 Percent Solution 10 The good science reporter 51 Common Denominators 13 Hooked on science 52 Gauging the Importance of Science 53 Unfriendly assessments 13 When tortoise meets hare 14 Media Gatekeepers 55 Language barriers 15 Margin of error 16 The current agenda 55 Objective vs. subjective 17 Not enough interest 57 Gatekeepers as obstacles 58 Changing times, concurrent threats 17 What does the public want? 19 Nothing Succeeds Like Substance 60 A new interest in interaction 20 Running Scared 61 Dams, Diversions & Bottlenecks 21 Meanwhile,
    [Show full text]
  • Spring 1991 Gems & Gemology
    VOLUMEGEMS&GEMOLOGY XXVll SPRING 1991 SPRING 1991 Volume 27 No. 1 TABLE OF CONTENTS 1 The International Gemological Symposium: Facing the Future with GIA William E. Boyajian 2 Age, Origin, and Emplacement of Diamonds: Scientific Advances in the Last Decade Melissa B. IZirlzley, Iohn I. Gzlrney, and Alfred A. Levinson 26 Emeralds of the Panjshir Valley, Afghanistan Gary Bowersox, Lawrence W Snee, Eugene E. Foord, and Robert R. Seal II REGULARFEATURES 40 Gem Trade Lab Notes 46 Gem News 57 The Most Valuable Article Award and a New Look for Gems & Gemology I 59 Gems & Gemology Challenge - 61 Gemological Abstracts SPECIALSECTION: THE INTERNATIONAL GEMOLOGICALSYMPOSIUM Introduction 1 Abstracts of Feature Presentations 15 Panels and Panelists 17 Poster Session-A Marketplace of New Ideas ABOUT THE COVER: Diamonds are the heart of the jewelry industry Of critical importance is the continued supply of fine diamonds from the mines into the n~arlzetplace.The article on recenl research into the age, origin, and emplacement - of diamonds featured ~n this issue reviews new developments thul will be useful in the exploration and mining of diamonds for yeors to come. It cojncjdes with 1 the celebration of CIA'S diamond anniversary-60 years of service to the jewelry indrrstry In fi~tingtribute, this 89.01-ct D-internally flawless modified shield cut- the Guinea Star-sits above a group of fine rough diamonds that range from 0.74-12.76 ct. The faceted diamond is courtesy of William Goldberg Diamond Corp., New York; the other dicrmonds are courtesy of Cora Dinmond Corp., New York. Photo by Shone McClure.
    [Show full text]
  • Instituto De Astrofísica De Andalucía IAA-CSIC
    Cover Picture. First image of the Shadow of the Supermassive Black Hole in M87 obtained with the Event Horizon Telescope (EHT) Credit: The Astrophysical Journal Letters, 875:L1 (17pp), 2019 April 10 index 1 Foreword 3 Research Activity 24 Gender Actions 26 SCI Publications 27 Awards 31 Education 34 Internationalization 41 Workshops and Meetings 43 Staff 47 Public Outreach 53 Funding 59 Annex – List of Publications Foreword coordinated at the IAA. This project, designed to study the central region of the Milky Way with an This Report comes later than usual because of the unprecedented resolution, unravels the history of Covid-Sars2 pandemia. Let us use these first lines star formation in the galactic center, showing that to remember those who died on the occasion of it has not been continuous. In fact, an intense Covid19 and to all those affected personally. We episode of star formation that occurred about a thank all the people, especially in the health sector, billion years ago was detected, where stars with a who worked hard for the good of our society. combined mass of several tens of millions of suns were formed in less than 100 million years. After having received the Severo Ochoa Excellence award in June 2018, 2019 was the first year to be Many other interesting results were published by fully dedicated to our highly competitive strategic IAA researchers in more that 250 publications in research programme. Already the first week of refereed journals, a number of those reflecting our April 2019 was a very special one for the IAA life.
    [Show full text]
  • Nature. Vol. VI, No. 139 June 27, 1872
    Nature. Vol. VI, No. 139 June 27, 1872 London: Macmillan Journals, June 27, 1872 https://digital.library.wisc.edu/1711.dl/LBXITYVRTMAPI83 Based on date of publication, this material is presumed to be in the public domain. For information on re-use, see: http://digital.library.wisc.edu/1711.dl/Copyright The libraries provide public access to a wide range of material, including online exhibits, digitized collections, archival finding aids, our catalog, online articles, and a growing range of materials in many media. When possible, we provide rights information in catalog records, finding aids, and other metadata that accompanies collections or items. However, it is always the user's obligation to evaluate copyright and rights issues in light of their own use. 728 State Street | Madison, Wisconsin 53706 | library.wisc.edu NATURE — 157 The Committee has made three reports, namely, in THURSDAY, JUNE 27, 1872 1868, 1870, and 1871, the two first prepared by Sir W. Thomson, and the third by Mr. E. Roberts of the Nauti- | cal Alliance Office, under whose able superintendence the computations and deductions were placed. The ; three reports have been published zz eafenso by the THE TIDES AND THE TREASURY British Association in the volumes of the above-mentioned UR readers may have heard that England is a “sea- | years. They bring fully under view the theoretical basis O girt isle,” and that we are a maritime nation, pos- | of the investigation, an account of observations made by sessing a very powerful navy and an extensive commerce, | the Committee and by the authorities, some of the con- They also know that the ocean to which we owe these | clusions deduced therefrom, and a statement of the mea- peculiarities is a very restless fluid, its surface being ruffled | sures recommended in order to extend and perfect our by the wind, and its entire mass uplifted and depressed knowledge of the subject.
    [Show full text]
  • A Personal History of H.M
    A PERSONAL HISTORY OF H.M. NAUTICAL ALMANAC OFFICE 30 October 1930 - 18 February 1972 By Donald H. Sadler Edited by George A. Wilkins SIDFORD, DEVON, 2008 2 DONALD H. SADLER © Copyright United Kingdom Hydrographic Office, 2008 A Personal History of H. M. Nautical Almanac Office by Dr. Donald H. Sadler, Superintendent of HMNAO 1936-1970, is a personal memoir; it does not represent the views of, and is not endorsed by, HMNAO or the United Kingdom Hydrographic Office. The United Kingdom Hydrographic Office grants permission to reproduce the document, in whole or in part, provided that it is reproduced unchanged and with the copyright notice intact. The photograph of Sadler taken when President, is reproduced by kind permission of the Royal Astronomical Society (RAS). If you wish to reproduce this picture, please contact the Librarian, Royal Astronomical Society, Burlington House, Piccadilly, London, W1J 0BQ, United Kingdom. This work may be downloaded from HMNAO’s website at http://www.hmnao.com/history PERSONAL HISTORY OF H.M. NAUTICAL ALMANAC OFFICE, 1930-1972 3 SUMMARY OF CONTENTS Preface 10 Forewords by Donald H. Sadler 13 Prologue 15 Part 1: At Greenwich: 1930–1936 17 1. First impressions 17 2. Mainly about the work of the Office 22 3. Mainly about L. J. Comrie and his work 30 Part 2: At Greenwich: 1936–1939 39 4. Change and expansion 39 5. New developments 46 6. Procedures and moves 53 Part 3: At Bath: 1939–1949 57 7. Early days at Bath (before the move to Ensleigh) 57 8. From the move to Ensleigh to the end of the war 67 9.
    [Show full text]