DOCSLIB.ORG

U. S. Geological Survey. REPORTS-OPEN FILE SERIES, No

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
U. S. Geological Survey. REPORTS-OPEN FILE SERIES, No U. S. Geological Survey . REPORTS -OPEN FILE SERIES , no. 1582 : 1971. (?-oo) May 1971 ~21~ JU;. ; _st-:<_ u.{.~~· c4""'~ - ~--ft. -~; Jw. /S6'z: I 17 ;J A List of References on Lead Isotope Geochemistry 1967-1969 (with an Addendum to the List through 1966) by Bruce R. Doe I ' 1 U. S. Geological Survey Denver, Colorado (Compiled primarily from Chemical Abstracts, Geophysical Abstrac ts , Mass Spectrometry Bulletin, and personal r eprint files) This bibliography was constructed to be as complete as possible for terminal papers containing new data relative to the geochemical applications of: Common lead U-Th-Pb isotopic dating Pb-a Pb210, Pb212, Pb214 No effort was made for completeness of: Annual reports, Yearbooks, etc. Review papers although many are included. Abstracts and theses are omitted. Wel.cl - Int. 2905 .,., U.S. Gmi.OGICAL SURVEY ( WASHIHGroN, D. C. ) -· 20242 For rel.eaee Jl!lE 2.3, 1971' The U.S. Geol.Qgioal S\U"VeY ia releasing in open file the fol.lmring reports. Copiee are a"f8.ilable for inspection in the Geological Survey Libraries, 1033 GS Bldg., Waahingt'on, D.C. 20242; Bldg. 25, Fed.eral Center, Denver, Colo. 80225; and 345 Middlefield Rd. , Menlo Park, Ca.li.t. 94025. Copies are al8o available !or inspection at other offices as listed: 1. Geologic map o! the Indian Hills quadrangle, J~ferson County, Colo­ rado, by Bruce Bryant, Robert D. Mil.ler, and Glenn R. Scott. 59 p. , 2 pl., 1 fig. (Scale 1:24,000). 1012 Federal Bldg., Denver, Colo. 80202; 8102 Federal Office Bldg., Salt Lake City, Utah 84lll; Colorado Geol. Survey, 254 Columbine Bldg. , 1845 Sherman St. , Denver, Colo. 802()3. bfaterial from which copy can be made at private expense is available at 1012 Federal Bldg., "DertnJr.J 2 A list of references on lead isotope geochemistry, l'j_67-1969 (with an addendum to the list through 1966), ~ Bruce R. Doe. 28 p. LMaterial tram which copy can be made at private expense is available in the Library, USGS, Bldg. 25, Federal Center, DerrverJ I 3. Geology of the Sargent fault zone in tho vicinity of Mount Madonna, Santa Clara County, california, by Robert J. McLaughlin. 1 map, scale 1:12,000, explanation, cross-sections (3 sheets in all). 504 Custom House, San Francisco, Calif. 94lll; 7638 Federal Bldg., Los Angeles, calif. 90012; California Div. Mines and Geology Library, Ferry Bldg., San Francisco, Calif. 94lllj,~and State Office Bldg., 107 So. Broadway, Los Angeles, Calif. 90012. LMterial from which copy can be made at private expense is available in the San Fran- .f cisco and Loe Angeles offices of the USGS listed above, and in the Library,.. reGS, 345 Middlefield Rd. , Menlo Park, Calif. 94025J Correction to address of depositery: On June 3, 1971, the following was placed in open file, with one of the depositories listed ae Woods Hole Oceanog. Inst: Fol.lowi.ng is the correct listing for the depository in Woods Hole: Western Gulf of Maine and the southeastern Massachusetts offshore area: sec:Umenta.ry framework, by R. N. Old.ale, Elaza.r Uohupi, and K. E. Prada. USGS, Albatross St., Woods Hole, Mass. 02543. Lead Isotope References 1969 Allegre, Claude J. Portioning of the U-Th -Pb system in the upper mantle and its evolution model through geological time: Earth Planet. Sci. Lett. 2, 261 -269, 1969. Armstrong, Richard Lee . Correction I to "A model for the evolution of strontium and lead isotopes in a dynamic earth," 1968]: Rev. Geophysics, v. 7, no. 3, p. 665, 1969. Arnaudov, V.; Amov, Bl.; Pavlova, M. Absolute geological age of some southern Bulgarian pegmatites: Izv. Geol. Inst., Bulg. Akad. Nauk., Ser. Geokhim., Mineral. Petrogr., 18, 19-27, 1969. Assaf, G. Emanated products as a probe of atmospheric transport: Tellus, v. 21, no. 6, p. 820-828, 1969. Banks, Philip 0 .; Cain, J. Allen. Zircon ages of Precambrian granitic rocks, northeastern Wis consin: Jour. Geology, v. 77, no. 2, p. 208 -220 , 1969. Banks, Philip o.; Shimizu, Nobumichi . Isotopic measurements on zircons from Japanese granitic rocks: Geochem. Jour., v. 3, no. 1, p. 25 -34, 1969. Banks, P. 0.; Rebello, D. P. Zircon age of a Precambrian rhyolite, northeastern Wisconsin: Geol. Soc. America Bull., v. 80, no. 5, p. 907-910, 1969. Bartnitskiy, Ye. N.; Yeliseyeva, G. D.; Shcherbak, N. P. Isotopic composition of lead in granites from the western part of the Ukrainian shield (in Russian with English summ.): Geokhimiya, no. 8, p. 991-996, 1969. ' Beasley, T. M., Lead-210 produc~ion by nuclear devices: 1946-1958 : Nature, v. 224, no. 5219, p. 573, 1969. Beasley, Thomas M.; Osterberg, Charles L. Spontaneous deposition of lead on silver and nickel from inorganic and organic digests: Anal . Chern ., v . 41, no. 3, p. 541-543 , 1969. Birkenfeld, H. ; Haase, G.; Zahn, H. Mass spectrometric isotope analysis (German): Book. Phys.-Chem. Trenn und Messmethoden. Veb Deutscher Verlag der Wissenschaften Berlin, v. 5, 323 p., 1969. Bonnyman, J.; Malina-Ramos, J. Concentrations of lead-210 in rain water in Australia during the years 1964 -1967: Commonwealth X-ray Radium Lab ., Rep. 1969, CXRL-10, 11 p., 1969. Brookins, D. G.; Fairbairn, H. W.; Hurley, P.M.; Pinson, W. H. A Rb-Sr geochronologic study of the pegmatites of the Middletown area, Connecticut: Contr. Mineralogy and Petrology, v. 22, no. 2 , p . 157-168, 1969 . 1 Burger, A. J. ; Oosthuyzen, E. J.; Van Niekirk, C. B. New lead isotopic ages for minerals from granitic rocks, Northern and Central Transvaal: Rep. Suid-Africa Dept. Mynwese, Geol. Opname, Ann. Geol.-Opname, 1967, v. 6, p. 85-89, 1969. Burwash, R. A. Comparative Precambrian geochronology of the North American, European, and Siberian shields: Canadian Jour. Earth Sci., v. 6, no. 3 , p. 357-365, 1969. Cameron, A. E.; Smith, D. H.; Walker, R. L. Mass spectrometry of nano-gram-size samples of lead: Anal. Chern., v. 41, no. 3, p. 525-525, 1969. Cannon, RalphS., J r .; Pierce, Arthur P. Lead isotope guides for Mississippi Valley lead-zinc exploration: u. S. Geol. Survey Bull. 1312-G, p. Gl-G20, 1969. Cassedanne, Jacques P. Linear distribution of lead and zinc deposits of Brazil (with English and Portuguese abs.): Chronique Mines et Recherche Miniere, v. 37, no. 382, p. 119-124, 1969. Cassedanne, J.; Lasserre, M. Geologic study and isotopic analysis, by the lead method, of some galenas of Brazil (with English abs.): [ France l Bur. Recherches Geol. et Minieres Bull., 2d ser., sec. 4, Geologie Generale et Divers, no. 1, p. 71-87, 1969. Chow, Tsaihwa J. Lead isotopes of the Red Sea region: Earth and Planetary Sc. Letters, v. 4, no. 3, p. 143-147, 1969. Compston, W.; Oversby, V. M. Lead isotopic analysis using a double spike: J. Geophys. Res., v. 74, no. 17, p. 4338-4348, 1969. Cooper, J. A.; Green, D. H. Lead isotope measurements on lherzolite inclusions and host basanites from western Victoria, Australia: Earth and Planetary Sci. Letters, v. 6, no. 1, p. 69-76, 1969. Cooper, J. A.; Reynolds, P. H.; Richards, J. R. Double-spike calibration of the Broken Hill standard lead: Earth and Planetary Sci. Letters, v . 6, no . 6, p. 467-478, 1969. Coo per, John A.; Richards, John R. Lead isotope measurements on volcanics and associated galenas from the Coromandel-Te Aroha region, New Zealand: Geochem. Jour., v. 3, no. 1, p. 1-14, 1969. Cooper, J. A.; Ric hards, J. R. Lead isotope measurements on sediments from Atlantis II and Discovery Deep areas, in Hot brines and recent heavy metal deposits in the Red Sea-cE. T. Degens; D. A. Ross, editors): New York, Springer-Verlag, p. 499-511, 1969. 2 Coppens, R.; Kosztonalyi, Ch.; Dottin, H. Geochronologic study of the Brugeaud mine, in La geologie de l'uranium dans le Massif granitique de Saint-Sylvestre (Limousin- Massif Central francais) : Sci . Terr. Mem . , no . 15, p. 195-213, 1969. Cumming, G. L.; Rob e rtson, D. K. Isotopic composition of lead from the Pine Point deposit: Econ . Geology, v . 64, no. 7, p. 731-732, 1969 . Danilov, L. T.; Keshishyan, G. 0.; Burgov, N. M. Mobility of lead isotopes in rocks (with English summ . ): Geokhimiya, no. 5, p . 582-588, 1969. Delhal, J.; Ledent, D.; Cordani, U. Pb:U, Rb:Sr and K:Ar ages of metamorphic formations and granites of southeastern Brazil (States of Rio de Janeiro and Minas Gerais (with English abs.): Soc. Geol. Belgique Annales, v . 92 , no. 2, p . 271-283, 1969 . DeVilliers, J.; Burger, A. J. The minimum age of certain granites from the Richtersveld area: Rep. Suid-Afrika Dept. Mynwese, Geol. Opname, Ann. Geol. Opname, 1967, v. 6, p . 83-84, 1969. Doe, B. R. ; Lipman, P . W.; Hedge, C. E. Radiogenic tracers and the source of contine ntal andesites: a beginning at the San Juan Volca nic Field, Colorado: Proceedings of the Conference on Andesites: Int . Upper Mantle Sci . Rpt . 16: State Oregon Dept . Geo. Mineral. Industries Bull . 65, p . 143- 149 , 1969 . Doe, Bruce R.; Lipman, Peter W.; Hedge, Carl E . ; Kurasawa, Hajime Primitive and contaminated basalts from the Southern Rocky Mountains, U.S.A.: Contrib . Mineral. Petrol.~' 142-156, 1969. Doe, Bruce R. ; Pearson, Robert C. U- Th-Pb chronology of zircons from the St. Kevin Granite, northern Sawatch Range, Colorado: Geol . Soc. America Bull., v. 80, no. 12, p. 2495-2502, 1969. Fisher, H. L. Model f or estimating the inhalation exposure to radon- 222 and daughter products from the accumulated lead-210 body burden: Health Phys., v . 16, no. 5, p. 597-616, 1969. Franke, H. W. Methods of geochronology: Heidelberg, Springer Verlag, 132 p . , 1969 .
Load more

Recommended publications
  • Geochronology Database for Central Colorado
    Geochronology Database for Central Colorado Data Series 489 U.S. Department of the Interior U.S. Geological Survey Geochronology Database for Central Colorado By T.L. Klein, K.V. Evans, and E.H. DeWitt Data Series 489 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director U.S. Geological Survey, Reston, Virginia: 2010 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: T.L. Klein, K.V. Evans, and E.H. DeWitt, 2009, Geochronology database for central Colorado: U.S. Geological Survey Data Series 489, 13 p. iii Contents Abstract ...........................................................................................................................................................1 Introduction.....................................................................................................................................................1
    [Show full text]
  • A Late Glacial and Holocene Chronology of the Castner Glacier, Delta River Valley, Alaska Michael W
    View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by UNH Scholars' Repository University of New Hampshire University of New Hampshire Scholars' Repository Master's Theses and Capstones Student Scholarship Winter 2008 A late glacial and holocene chronology of the Castner Glacier, Delta River Valley, Alaska Michael W. Howley University of New Hampshire, Durham Follow this and additional works at: https://scholars.unh.edu/thesis Recommended Citation Howley, Michael W., "A late glacial and holocene chronology of the Castner Glacier, Delta River Valley, Alaska" (2008). Master's Theses and Capstones. 421. https://scholars.unh.edu/thesis/421 This Thesis is brought to you for free and open access by the Student Scholarship at University of New Hampshire Scholars' Repository. It has been accepted for inclusion in Master's Theses and Capstones by an authorized administrator of University of New Hampshire Scholars' Repository. For more information, please contact [email protected]. A LATE GLACIAL AND HOLOCENE CHRONOLOGY OF THE CASTNER GLACIER, DELTA RIVER VALLEY, ALASKA BY MICHAEL W. HOWLEY B.S., University of New Hampshire, 2006 THESIS Submitted to the University of New Hampshire in Partial Fulfillment of the Requirements for the Degree of Master of Science in Earth Sciences: Geology December, 2008 UMI Number: 1463225 INFORMATION TO USERS The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleed-through, substandard margins, and improper alignment can adversely affect reproduction. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted.
    [Show full text]
  • It's About Time: Opportunities & Challenges for U.S
    I t’s About Time: Opportunities & Challenges for U.S. Geochronology About Time: Opportunities & Challenges for t’s It’s About Time: Opportunities & Challenges for U.S. Geochronology 222508_Cover_r1.indd 1 2/23/15 6:11 PM A view of the Bowen River valley, demonstrating the dramatic scenery and glacial imprint found in Fiordland National Park, New Zealand. Recent innovations in geochronology have quantified how such landscapes developed through time; Shuster et al., 2011. Photo taken Cover photo: The Grand Canyon, recording nearly two billion years of Earth history (photo courtesy of Dr. Scott Chandler) from near the summit of Sheerdown Peak (looking north); by J. Sanders. 222508_Cover.indd 2 2/21/15 8:41 AM DEEP TIME is what separates geology from all other sciences. This report presents recommendations for improving how we measure time (geochronometry) and use it to understand a broad range of Earth processes (geochronology). 222508_Text.indd 3 2/21/15 8:42 AM FRONT MATTER Written by: T. M. Harrison, S. L. Baldwin, M. Caffee, G. E. Gehrels, B. Schoene, D. L. Shuster, and B. S. Singer Reviews and other commentary provided by: S. A. Bowring, P. Copeland, R. L. Edwards, K. A. Farley, and K. V. Hodges This report is drawn from the presentations and discussions held at a workshop prior to the V.M. Goldschmidt in Sacramento, California (June 7, 2014), a discussion at the 14th International Thermochronology Conference in Chamonix, France (September 9, 2014), and a Town Hall meeting at the Geological Society of America Annual Meeting in Vancouver, Canada (October 21, 2014) This report was provided to representatives of the National Science Foundation, the U.S.
    [Show full text]
  • Dicionarioct.Pdf
    McGraw-Hill Dictionary of Earth Science Second Edition McGraw-Hill New York Chicago San Francisco Lisbon London Madrid Mexico City Milan New Delhi San Juan Seoul Singapore Sydney Toronto Copyright © 2003 by The McGraw-Hill Companies, Inc. All rights reserved. Manufactured in the United States of America. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be repro- duced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. 0-07-141798-2 The material in this eBook also appears in the print version of this title: 0-07-141045-7 All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. Where such designations appear in this book, they have been printed with initial caps. McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs. For more information, please contact George Hoare, Special Sales, at [email protected] or (212) 904-4069. TERMS OF USE This is a copyrighted work and The McGraw-Hill Companies, Inc. (“McGraw- Hill”) and its licensors reserve all rights in and to the work. Use of this work is subject to these terms. Except as permitted under the Copyright Act of 1976 and the right to store and retrieve one copy of the work, you may not decom- pile, disassemble, reverse engineer, reproduce, modify, create derivative works based upon, transmit, distribute, disseminate, sell, publish or sublicense the work or any part of it without McGraw-Hill’s prior consent.
    [Show full text]
  • Us Department of the Interior Us Geological Survey
    U.S. DEPARTMENT OF THE INTERIOR U.S. GEOLOGICAL SURVEY QUATERNARY GEOLOGY OF THE GRANITE PARK AREA, GRAND CANYON, ARIZONA: AGGRADATION-DOWNCUTTING CYCLES, CALIBRATION OF SOILS STAGES, AND RESPONSE OF FLUVIAL SYSTEM TO VOLCANIC ACTIVITY By Ivo Lucchitta1 , G.H. Curtis2, M.E. Davis3, S.W. Davis3, and Brent Turrin4. With an Appendix by Christopher Coder, Grand Canyon National Park, Grand Canyon, AZ 86040 Open-file Report 95-591 This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. J U.S. Geological Survey, Flagstaff, AZ 86001 2 Berkeley Geochronology Center, Berkeley, CA 94709 3 Davis2, Georgetown, CA 95634 4 U.S. Geological Survey, MenLo Park, CA 94025 nr ivv ^^^^t^^^^^'^S:^ ';;.; ;.:;. .../r. - '.''^.^.v*'' ^.vj v'""/^"i"%- 'JW" A- - - - -- - * GLEN CANYON ENVIRONMENTAL STUDIES QUATERNARY GEOLOGY-GEOMORPHOLOGY PROGRAM REPORT 2 QUATERNARY GEOLOGY OF THE GRANITE PARK AREA, GRAND CANYON, ARIZONA: DOWNCUTTING- AGGRADATION CYCLES, CALIBRATION OF SOIL STAGES, AND RESPONSE OF FLUVIAL SYSTEM TO VOLCANIC ACTIVITY CONTENTS ABSTRACT INTRODUCTION PURPOSE METHODS RESULTS Geology and geomorphology Soils Geo chronology SUMMARY AND CONCLUSIONS Geochronology Geology and geomorphology Soils Soil-stage calibration Processes REFERENCES ACKOWLEDGMENTS APPENDICES A Synopsis of Granite Park Archeology B Representative Soil Profile Descriptions C Step-heating spectra, isochrons and sampling comments for 39Ar-40Ar age determinations on Black Ledge basalt flow, Granite Park area, Grand Canyon FIGURES PLATES AND FIGURES Plate 1. View at mile 207.5 Plate 2. View of section at mile 208.9 Figure 1.
    [Show full text]
  • © Copyright 2019 Sean R. Lahusen
    © Copyright 2019 Sean R. LaHusen Landslides in Cascadia: Using geochronometry and spatial analysis to understand the timing, triggering and spatial distribution of slope failures in the Pacific Northwest United States Sean R. LaHusen A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy University of Washington 2019 Reading Committee: Alison R. Duvall, Chair David R. Montgomery Joseph Wartman Program Authorized to Offer Degree: Earth and Space Sciences University of Washington Abstract Landslides in Cascadia: Using geochronometry and spatial analysis to understand the timing, triggering and spatial distribution of slope failures in the Pacific Northwest United States Sean R. LaHusen Chair of the Supervisory Committee: Dr. Alison R. Duvall Earth and Space Sciences Landslides kill hundreds to thousands of people every year, cause billions of dollars in infrastructure damage, and act as important drivers of landscape evolution. In the Pacific Northwest USA, landslides routinely block roads and railways and periodically destroy homes, as recently evinced by the catastrophic 2014 Oso Landslide, which killed 43 people. Ongoing mapping efforts, aided by the ever-growing availability of bare-earth lidar elevation data, have identified tens of thousands of landslides in Washington and Oregon States. Little is known about the timing of these slope failures, and without age constraints, it is impossible to assess recurrence frequency or understand past landslide triggers. In Chapter 2, I address this problem by developing a landslide dating technique which uses surface roughness measured from lidar data as a proxy for landslide age. Unlike other landslide dating methods such as radiocarbon, exposure dating, or dendrochronology, the surface-roughness dating technique can be practically applied on a regional scale and offers an important tool for estimating landslide recurrence interval and assessing changes in landslide frequency across space.
    [Show full text]
  • Geochronological Applications
    Paleomagnetism: Chapter 9 159 GEOCHRONOLOGICAL APPLICATIONS As discussed in Chapter 1, geomagnetic secular variation exhibits periodicities between 1 yr and 105 yr. We learn in this chapter that geomagnetic polarity intervals have a range of durations from 104 to 108 yr. In the next chapter, we shall see that apparent polar wander paths represent motions of lithospheric plates over time scales extending to >109 yr. As viewed from a particular location, the time intervals of magnetic field changes thus range from decades to billions of years. Accordingly, the time scales of potential geochrono- logic applications of paleomagnetism range from detailed dating within the Quaternary to rough estimations of magnetization ages of Precambrian rocks. Geomagnetic field directional changes due to secular variation have been successfully used to date Quaternary deposits and archeological artifacts. Because the patterns of secular variation are specific to subcontinental regions, these Quaternary geochronologic applications require the initial determination of the secular variation pattern in the region of interest (e.g., Figure 1.8). Once this regional pattern of swings in declination and inclination has been established and calibrated in absolute age, patterns from other Quaternary deposits can be matched to the calibrated pattern to date those deposits. This method has been developed and applied in western Europe, North America, and Australia. The books by Thompson and Oldfield (1986) and Creer et al. (1983) present detailed developments. Accordingly, this topic will not be developed here. This chapter will concentrate on the most broadly applied of geochronologic applications of paleomag- netism: magnetic polarity stratigraphy. This technique has been applied to stratigraphic correlation and geochronologic calibration of rock sequences ranging in age from Pleistocene to Precambrian.
    [Show full text]
  • North American Stratigraphic Code1
    NORTH AMERICAN STRATIGRAPHIC CODE1 North American Commission on Stratigraphic Nomenclature FOREWORD TO THE REVISED EDITION FOREWORD TO THE 1983 CODE By design, the North American Stratigraphic Code is The 1983 Code of recommended procedures for clas- meant to be an evolving document, one that requires change sifying and naming stratigraphic and related units was pre- as the field of earth science evolves. The revisions to the pared during a four-year period, by and for North American Code that are included in this 2005 edition encompass a earth scientists, under the auspices of the North American broad spectrum of changes, ranging from a complete revision Commission on Stratigraphic Nomenclature. It represents of the section on Biostratigraphic Units (Articles 48 to 54), the thought and work of scores of persons, and thousands of several wording changes to Article 58 and its remarks con- hours of writing and editing. Opportunities to participate in cerning Allostratigraphic Units, updating of Article 4 to in- and review the work have been provided throughout its corporate changes in publishing methods over the last two development, as cited in the Preamble, to a degree unprece- decades, and a variety of minor wording changes to improve dented during preparation of earlier codes. clarity and self-consistency between different sections of the Publication of the International Stratigraphic Guide in Code. In addition, Figures 1, 4, 5, and 6, as well as Tables 1 1976 made evident some insufficiencies of the American and Tables 2 have been modified. Most of the changes Stratigraphic Codes of 1961 and 1970. The Commission adopted in this revision arose from Notes 60, 63, and 64 of considered whether to discard our codes, patch them over, the Commission, all of which were published in the AAPG or rewrite them fully, and chose the last.
    [Show full text]
  • Skeletracks: Automatic Separation of Overlapping Fission Tracks in Apatite and Muscovite Using Image Processing
    skeletracks: automatic separation of overlapping fission tracks in apatite and muscovite using image processing Alexandre Fioravante de Siqueira1, 2, Wagner Massayuki Nakasuga1, and Sandro Guedes1 1Departamento de Raios Cosmicos´ e Cronologia, IFGW, University of Campinas, Brazil 2Institut f ¨urGeologie, TU Bergakademie Freiberg, Germany Corresponding author: Alexandre Fioravante de Siqueira1 Email address: [email protected] ABSTRACT One of the major difficulties of automatic track counting using photomicrographs is separating overlapped tracks. We address this issue combining image processing algorithms such as skeletonization, and we test our algorithm with several binarization techniques. The counting algorithm was successfully applied to determine the efficiency factor GQR, necessary for standardless fission-track dating, involving counting induced tracks in apatite and muscovite with superficial densities of about 6 × 105 tracks/cm2. INTRODUCTION The fission track dating (FTD) is based on the spontaneous fission of 238U, an impurity in natural minerals such as apatite and zircon (Wagner and Van den Haute, 1992). The fission process releases two fragments. They trigger the displacement of atoms, leading to structural net alterations called latent tracks. After convenient etching, channels are formed along the latent track trajectory and become visible under an optical microscope. These channels are referred to as tracks, and their number is used to calculate the fission-track age. Tracks are counted at the microscope or in photomicrographs captured using a camera coupled to a microscope, in a time expensive process. Besides, track counting efficiency is observer dependent; to keep it constant, a trained observer must keep full attention during the several hours taken to analyze a sample for fission-track dating.
    [Show full text]
  • Geology and Geochronometry of the Cogburn Creek-Settler Creek Area, Northeast of Harrison Lake, B.C
    GEOLOGY AND GEOCHRONOMETRY OF THE COGBURN CREEK-SETTLER CREEK AREA, NORTHEAST OF HARRISON LAKE, B.C. by JANET ELIZABETH GABITES B.Sc, Victoria University Of Wellington, New Zealand, 1973, B.Sc.(Honours), Victoria University Of Wellington, New Zealand, 1975 A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE STUDIES Department Of Geological Sciences We accept this thesis as conforming to the required standard THE UNIVERSITY OF BRITISH COLUMBIA September 1985 © Janet Elizabeth Gabites, 1985 in presenting this thesis in partial fulfilment of the requirements for an advanced degree at the University of British Columbia, I agree that the Library shall make it freely available for reference and study. I further agree that permission for extensive copying of this thesis for scholarly purposes may be granted by the head of my department or by his or her representatives. It is understood that copying or publication of this thesis for financial gain shall not be allowed without my written permission. Department of Geological Sciences The University of British Columbia 1956 Main Mall Vancouver, Canada V6T 1Y3 n.t„ 8 October 1985 DE-6(3/81) ii Abstract Metamorphic supracrustal rocks in the Cogburn Creek area belong to the Cogburn Creek Group and the Settler Schist. These are separated by a melange zone, which has been correlated with the Shuksan thrust zone and contains Baird Metadiorite and ultramafic rocks, and intruded by the Spuzzum batholith and minor younger granodiorite. Three phases of folding are recognised in the schist units: fi is associated with contact metamorphism that preceded regional metamorphism, f2 produced pervasive mica foliation and tight folds, and kinks and broad warps are associated with f3, which was locally pervasive approaching pluton margins.
    [Show full text]
  • Selected Papers on the Geology of Washington
    SELECTED PAPERS ON THE GEOLOGY OF WASHINGTON J. ERIC SCHUSTER, Editor WASHINGTON DIVISION OF GEOLOGY AND EARTH RESOURCES BULLETIN 77 1987 •• WASHINGTON STATE DEPARTMENT OF =~;;;arf;t Natural Resources Brian Boyle • Commlnloner ol Public Land> Art Sleoms · Supervisor Division ol Geology and Earth Resources Raymond Lamianis. Stale Geologist This report is for sale by: Publications Washington Deparbnent of Natural Resources Division of Geology and Earth Resources Mail Stop PY-12 Olympia, WA 98504 Price $ 14.84 Tax 1.16 Total $ 16.00 Mail orders must be prepaid; please add $1.00 to each order for postage and handling. Make checks payable to the Department of Natural Resources. This book is printed on acid-free paper. Printed in the United States of America. ii This volume is in memory of Randall L. Gresens (1935-1982) E. Bates McKee, Jr. (1934-1982) and in honor of Julian D. Barksdale (1904-1983) Howard A. Coombs Peter Misch A. Lincoln Washburn and Harry E. Wheeler (1907-1987) for their service to the University of Washington, Department of Geological Sciences, and their contributions to the geological sciences. iii iv CONTENTS page Preface J. Eric Schuster and Eric S. Cheney vii A tectonic and geochronologic overview of the Priest River crystalline complex, northeastern Washington and northern Idaho William A. Rehrig, Stephen J. Reynolds, and Richard L. Armstrong ......................... I Rb-Sr and U-Pb geochronometry of the Priest River metamorphic complex­ Precambrian X basement and its Mesozoic-Cenozoic plutonic-metamorphic overprint, northeastern Washington and northern Idaho Richard Lee Armstrong, Randall R. Parrish, Peter van der Heyden, Stephen J.
    [Show full text]
  • Stratigraphy: a Modern Synthesis Andrew D
    Stratigraphy: A Modern Synthesis Andrew D. Miall Stratigraphy: A Modern Synthesis 123 Andrew D. Miall Department of Geology University of Toronto Toronto, ON Canada ISBN 978-3-319-24302-3 ISBN 978-3-319-24304-7 (eBook) DOI 10.1007/978-3-319-24304-7 Library of Congress Control Number: 2015952024 Springer Cham Heidelberg New York Dordrecht London © Springer International Publishing Switzerland 2016 This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, express or implied, with respect to the material contained herein or for any errors or omissions that may have been made. Printed on acid-free paper Springer International Publishing AG Switzerland is part of Springer Science+Business Media (www.springer.com) “For Meredith, Henry and Owen” Preface The stratigraphic record is the major repository of information about the geological history of Earth, a record stretching back for nearly 4 billion years.
    [Show full text]