DOCSLIB.ORG

Project Report of the Aeromagnetic Survey for the Holitna Basin Area, Western Alaska

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Project Report of the Aeromagnetic Survey for the Holitna Basin Area, Western Alaska August 6,1998 Price: $23.70 Division of Geological & Geophysical Surveys PROJECT REPORT OF THE AEROMAGNETIC SURVEY FOR THE HOLITNA BASIN AREA, WESTERN ALASKA Sial Geosciences IncJ On-Line Exploration Services Inc. August 1998 THIS REPORT HAS NOT BEEN REVIEWED FOR TECHNICAL CONTENT (EXCEPT AS NOTED IN TEXT) OR FOR CONFORhIllY TO THE EDlTORIAL STANDARDS OF DGGS. Released by STATE OF ALASKA DEPARTMENT OF NATURAL RESOURCES Division of Geological & Geophysical Surveys 794 University Avenue. Suite 200 Fairbanks. Alaska 99709-3645 DEPARTMENT OF NATURAL RESOURCES DIVISION OF GEOLOGICAL & GEOPHYSICAL S STATE OF ALASKA I Contract 10-98-001 i PROJECT REPORT OF THE IAEROMAGNETIC SURVEY FOR THE HOLITNA BASIN PREA, WESTERN ALASKA ! 1 May 1998 DEPARTMENT OF NATURAL RESOURCES DIVISION OF GEOLOGICAL & GEOPHYSICAL SURVEYS STATEOFALASKA PROJECT REPORT OF THE AEROMAGNETIC SURVEY FOR THE HOLITNA BASIN AREA, WESTERN ALASKA Contract 10-98-001 Project 97-A03-36 SlAL GEOSCIENCES INC.1 ON-LINE EXPLORATION SERVICES INC. May 1998 TABLE OF CONTENTS Page 1.0 INTRODUCTION ...................................... 1 2.0 MANAGEMENT OF SURVEY ............................... 3 3.0 SURVEYAREA ........................................ 4 4.0 SURVEYEQUIPMENT .................................... 5 Aircraft ........................................ 5 Digital and Analog Acquisition System .................... 5 Airborne Magnetometer ............................ 6 Compensator .................................... 6 Radar altimeter .................................. 6 Barometric altimeter ............................... 6 Navigation and Flight Path Recovery Systems .............. 7 4.7.1 Video Camera .......................... 7 4.7.2 GPS ................................. 7 4.7.3 Pilot Guidance .......................... 7 Base stations .................................... 8 4.8.1 Main magnetic base station ................. 8 4.8.2 Remote magnetic base station ................ 8 4.8.3 GPS base station ......................... 10 Field Data Plotting and Verification System ............... I0 4.9.1 Hardware ............................. 10 4.9.2 Software .............................. 10 TABLE OF CONTENTS (cont'd) Page 5.0 OPERATIONS . FIELD PROCESSING .VERIFICATIONS ............. 11 5.1 Summary ...................................... 11 5.2 Quality control ................................... 12 5.2.1 Lag ................................. 12 5.2.2 Magnetic ..............................13 5.2.3 Altimeters ............................. 13 5.2.4 Magnetic base data ....................... 13 5.2.5 Differential GPS ......................... 14 5.3 Levelling ....................................... 14 5.4 Gridding and color plotting .......................... 15 6.0 OFFICE COMPILATION ................................. 15 6.1 Total field levelling and gridding ....................... 15 6.2 Altimeters ...................................... 16 7.0 DELIVERIES ......................................... 17 7.1 Maps ......................................... 17 7.2 Digital Data Recording .............................. 18 7.3 Miscellaneous Items ............................... 18 7.4 In-depth Analysis and Modelling ....................... 19 8.0 GEOLOGICALCONTEXT ................................. 19 TABLE OF CONTENTS (cont'd) Page 9.0 INTERPRETATION ..................................... 26 9.1 Magnetic Signatures from some Geological Features ......... 27 9.2 Analysis of the Total Field Magnetic Map ................. 39 9.3 Qualitative Interpretation ............................ 40 9.4 Spectral Analysis ................................. 41 9.5 2.54 Modelling .................................. 51 9.6 Euler Deconvolution ............................... 69 10.0 CONCLUSIONS .......................................75 SELECTEDREFERENCES ..................................... 76 LIST OF FIGURES Page Figure 1: Holitna basin survey area ........................ 2 Figure 2: Base station localization. Sleetmute ................. 9 Figure 3: Tectonic map of the survey area .................. 20 Figure 4: Generalized geologic map of Holitna basin showing gravity trends and surrounding upland terraces ................... 21 Figure 5: Magnetic anomaly shapes ....................... 28 Figure 6: Fault in the underlying rocks (1 ................... 29 Figure 7: Fault in the underlying rocks (2) ................... 30 Figure 8: Belt of volcanic rocks .......................... 31 Figure 9: Serpentinized peridotite sill ...................... 32 Figure 10 Gneissic terrain .............................. 33 Figure 11 Discordant intrusive ( 1) ......................... 34 Figure 12 Discordant intrusive (2) ......................... 35 Figure 13 Weakly magnetic metasediments .................. 36 Figure 14 a-b: Magnetic Mapping of an oil field ................... 37 Figure 14 c-d: Magnetic Mapping of an Oil Field .................. 38 Figure 15: he residual magnetic field . The survey area divided in six blocks ............... 44 Figure 16: Power Spectrum for the North-West part of the survey area 45 Figure 17: Power Spectrum for the North-Centre part of the survey area46 Figure 18: Power Spectrum for the North-East part of the survey area 47 Figure 19: Power Spectrum for the South-West part of the survey area 48 Figure 20: Power Spectrum for the South-Centre part of the survey area49 Figure 21: Power Spectrum for the South-East part of the survey area 50 Figure 22: Location of the 2.5.D modelled magnetic profiles ....... 52 Figure 23: 2.5.D modelled magnetic profile 1 ................. 53 Figure 24: 2.5.D modelled magnetic profile 2 ................. 54 Figure 25: 2.5.D modelled magnetic profile 3 ................. 55 Figure 26: 2.5.D modelled magnetic profile 4 ................. 56 Figure 27: 2.5.D modelled magnetic profile 5 ................. 57 Figure 28: 2.5.D modelled magnetic profile 6 ................. 58 Figure 29: 2.5.D modelled magnetic profile 7 ................. 59 Figure 30: 2.5.D modelled magnetic profile 8 ................. 60 Figure 31: 2.5.D modelled magnetic profile 9 ................. 61 Figure 32: 2.5.D modelled magnetic profile 10 ................ 62 Figure 33: 2.5.D modelled magnetic profile 11 ................ 63 Figure 34: 2.5.D modelled magnetic profile 12 ................ 64 Figure 35: 2.5.D modelled magnetic profile 13 ................ 65 Figure 36: 2.5.D modelled magnetic profile 14 ................ 66 Figure 37: 2.5.D modelled gravity profile A-A' ................. 67 LIST OF FIGURES (cont'd) Figure 38: 2.5.D modelled gravity profile 6-6' ................. 68 Figure 39: Magnetic field (flux lines) and fall-off rates for various geological models ............................. 71 Figure 40: Euler depth interpretation (dike model) .............. 72 Figure 41 : Euler depth interpretation (step model) .............. 73 Figure 42: Interpretation sketch map ....................... 74 FORWARD A contractor provided this report to us. Upon review, it became apparent that the geologic terminology used is no longer current. The geologic portion of this report (Section 8.0 Geologic Context) is based on data from Cady and others (1955) and a chapter from The Geology of North America (Volunle G-I, The Geology of Alaska, Chapter 14 - Interior Basins of Alaska, by C.E. Kirschner) that are no longer current. Consequently, some of the terminology is outdated and much of the geology of the survey area is not discussed. A brief discussion is included here, and the reader is referred to Decker and others (1994), and references included therein, for a more complete discussion of the regional geology. For exan~ple, Adrain and others (1995) recommended abandoning "Holitna Group" as a stratigraphic term. That term is used in this report. Recent improvements in the biostratigraphic zonation of rocks in the area have shown that several systems (spanning the early and middle Paleozoic) were included in the original definition by Cady and others (1955). The aeromagnetic survey described hcrein corresponds to a portion of the Farewell terrane bounded by the Denali-Farewell fault, the Kulukbuk thrust, and an unnamed northeast-trending fault located wcst of the Big River fault (Decker and others, 1994; see their fig. 1). They considered this part of the Fare\vell terrane as the Holitna basin. Decker and others (1994) describe the Holitna basin as including Proterozoic through Triassic age sedimentary rocks and minor Mesozoic age intrusive and extrusive igneous rocks. Additionally, we disagree with the conclusions reached in this report regarding oil and gas potential in the Holitna basin area. Section 8.0 of this report concludes with a valid statement regarding the petroleum potential of the Cretaceous and Tertiary strata in the vicinity of the Holitna basin. Past studies of the region have suggested poor to fair petroleum potential for Paleozoic strata. However, recently acquired conodont data from the northeastern part of the Holitna basin suggests that Middle to Upper Paleozoic rocks between the Gagaryah River and Lime Lakes region (Lime Hills quadrangle) were heated to maximum temperatures within the oil window (CAIs between 1.5 and 2.0). This suggests that the petroleum potential of Paleozoic rocks in the region llas not been adequately evaluated. Forward written by Dave LePain Works Cited: Adrain, J.M., Chatterton, B.D.E., and Blodgett, R.B., 1995. Silurian trilobites from southwestern Alaska. Journal of Paleontology, v. 69, p. 723-736. Cady, W.M., Wallace. R.E., Hoare, J.M., and Weber, F.R., 1955, The
Load more

Recommended publications
  • Guides to Understanding the Aeromagnetic Expression of Faults in Sedimentary Basins: Lessons Learned from the Central Rio Grande Rift, New Mexico
    Guides to understanding the aeromagnetic expression of faults in sedimentary basins: Lessons learned from the central Rio Grande rift, New Mexico V.J.S. Grauch U.S. Geological Survey, MS 964, Federal Center, Denver, Colorado 80225-0046, USA Mark R. Hudson U.S. Geological Survey, MS 980, Federal Center, Denver, Colorado 80225-0046, USA ABSTRACT cho, northwest of Albuquerque, New Mexico (Fig. 2). Linear anomalies are interpreted as faults that offset basin-fi ll sediments based on their High-resolution aeromagnetic data acquired over several basins in consistent correspondence to isolated exposures of mapped faults, follow- the central Rio Grande rift, north-central New Mexico, prominently up investigations at individual sites, and geophysical modeling (Grauch, display low-amplitude (5–15 nT) linear anomalies associated with 2001; Grauch et al., 2001, 2006). faults that offset basin-fi ll sediments. The linear anomalies give an As in many sedimentary basins, mapping faults in the central Rio unparalleled view of concealed faults within the basins that has sig- Grande rift is diffi cult because of the extensive alluvial cover. As a conse- nifi cant implications for future basin studies. These implications pro- quence, geologists have used the linear aeromagnetic anomalies to delin- vide the impetus for understanding the aeromagnetic expression of eate partially concealed faults and denote possible locations of totally faults in greater detail. Lessons learned from the central Rio Grande buried faults on geologic maps (e.g., Connell, 2006) and in fault compila- rift help to understand the utility of aeromagnetic data for examin- tions (Machette et al., 1998; Personius et al., 1999).
    [Show full text]
  • Magnetic Airborne Survey – Geophysical Flight
    Geosci. Instrum. Method. Data Syst., 5, 181–192, 2016 www.geosci-instrum-method-data-syst.net/5/181/2016/ doi:10.5194/gi-5-181-2016 © Author(s) 2016. CC Attribution 3.0 License. Magnetic airborne survey – geophysical flight Erick de Barros Camara1 and Suze Nei Pereira Guimarães2 1Brucelandair, Ontario, Canada 2Prospectors Aerolevantamentos e Sistemas Ltda, Rio de Janeiro, Brazil Correspondence to: Erick de Barros Camara ([email protected]) Received: 16 December 2015 – Published in Geosci. Instrum. Method. Data Syst. Discuss.: 2 February 2016 Revised: 9 May 2016 – Accepted: 19 May 2016 – Published: 6 June 2016 Abstract. This paper provides a technical review process in utilized both magnetic and radiometric methods. The fixed- the area of airborne acquisition of geophysical data, with em- wing aircraft PBY-5 (Catalina) was used in the survey. It was phasis for magnetometry. In summary, it addresses the cali- equipped with a Fluxgate magnetometer in the tail of the air- bration processes of geophysical equipment as well as the craft, which measured the total magnetic field (Hildebrand, aircraft to minimize possible errors in measurements. The 2004). The system was entirely analogue type, constructed corrections used in data processing and filtering are demon- using electromechanical units and an infinite series of valves. strated with the same results as well as the evolution of these All the data processing was done manually because, at that techniques in Brazil and worldwide. time, analogue data were recorded, tabulated, corrected, in- terpolated, and plotted on a cartographic base. The data were then presented in the form of a profile overlay on contour maps.
    [Show full text]
  • Application of Airborne Electromagnetics and Magnetics for Mineral Exploration in the Baishiquan–Hongliujing Area, Northwest China
    remote sensing Article Application of Airborne Electromagnetics and Magnetics for Mineral Exploration in the Baishiquan–Hongliujing Area, Northwest China Shengjun Liang 1, Siyuan Sun 1,2,* and Hongfei Lu 3 1 China Aero Geophysical Survey & Remote Sensing Center for Natural Resources, Beijing 100083, China; [email protected] 2 College of Geo-Exploration Sciences and Technology, Jilin University, Changchun 130026, China 3 Geological Team Six of Xinjiang Geological and Mineral Bureau, Hami 839000, China; [email protected] * Correspondence: [email protected]; Tel.: +86-010-6206-0135 Abstract: Airborne electromagnetics is an effective and efficient exploration tool in shallow mineral exploration for its high efficiency and low cost. In 2016, airborne electromagnetic and airborne magnetic surveys have been carried out at the border of Xinjiang Uygur Autonomous Region and Gansu Province, the Northwest China. With an integrated system, the airborne electromagnetics and airborne magnetic data were collected simultaneously by AreoTEM-IV system from Aeroquest International Limited in Vancouver, BC, Canada, and the CS3 Cesium Vapor magnetometer from Scintrex in Concord, ON, Canada. About 3149 line-km of both data with 250 m line space were acquired. After data processing, the comprehensive analysis and interpretation of resistivity and magnetic anomalies has been carried out to infer lithological structure and outline the potential ore Citation: Liang, S.; Sun, S.; Lu, H. deposits. Verified by the ground surveys, seven outlined anomalies are consistent with the known Application of Airborne ore sites, and one new gold deposit and several mineralization clues were found. The prospective Electromagnetics and Magnetics for reserves of gold are expected to exceed 10 tons.
    [Show full text]
  • Aeromagnetic Signature of the Geology and Mineral Resources Near the Pebble Porphyry Cu-Au-Mo Deposit, Southwest Alaska
    AEROMAGNETIC SIGNATURE OF THE GEOLOGY AND MINERAL RESOURCES NEAR THE PEBBLE PORPHYRY CU-AU-MO DEPOSIT, SOUTHWEST ALASKA by Eric D. Anderson A thesis submitted to the Faculty and the Board of Trustees of the Colorado School of Mines in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Geology). Golden, Colorado Date Signed: Eric D. Anderson Signed: Dr. Wei Zhou Thesis Advisor Golden, Colorado Date Signed: Dr. Paul Santi Professor and Interim Department Head of Geology and Geological Engineering ii ABSTRACT Aeromagnetic data are used to better understand the geology and mineral resources near the Late Cretaceous Pebble porphyry Cu-Au-Mo deposit in southwestern Alaska. The reduced-to-pole (RTP) transformation of regional-scale aeromagnetic data show that the Pebble deposit is within a cluster of magnetic anomaly highs. Similar to Pebble, the Iliamna, Kijik, and Neacola porphyry copper occurrences are in magnetic highs that trend northeast along the crustal-scale Lake Clark fault. A high-amplitude, short- to moderate-wavelength anomaly is centered over the Kemuk occurrence, an Alaska-type ultramafic complex. Similar anomalies are found west and north of Kemuk. A moderate-amplitude, moderate-wavelength magnetic low surrounded by a moderate-amplitude, short-wavelength magnetic high is associated with the gold-bearing Shotgun intrusive complex. The RTP transformation of the district-scale aeromagnetic data acquired over Pebble permits differentiation of a variety of Jurassic to Tertiary magmatic rock suites. Jura-Cretaceous basalt and gabbro units and Late Cretaceous biotite pyroxenite and granodiorite rocks produce magnetic highs. Tertiary basalt units also produce magnetic highs, but appear to be volumetrically minor.
    [Show full text]
  • Aeromagnetic Surveying with Unmanned Aircraft Systems
    Aeromagnetic surveying with unmanned aircraft systems by Michael Cunningham B.Sc. (Hons.) Physics, 2010 B.Sc. (Hons.) Earth Sciences, 2014 A thesis submitted to the Faculty of Graduate and Postdoctoral Affairs in partial fulfillment for the degree of Master of Science in Earth Sciences Carleton University Ottawa, Ontario ©2016 Michael Cunningham Abstract UASs have been under rapid development for applications in the mineral exploration industry, mainly for aeromagnetic surveying. They provide improved detection of smaller, deeper and weakly magnetic targets. A traditional system flying an altitude of 100m above ground level can detect a spherical ore body at a depth of 40m and magnetic susceptibility of 10-4, with a radius of ~16m. A UAS flying at 50m or 2m altitude AGL would require the radius to be 11m or 5m, respectively. Using the Venturer fixed-wing UAS and the SkyLance rotary-wing UAS, two aeromagnetic surveys were performed. The Venturer was stable in flight with a fourth difference noise level within industry standards of ±0.05nT. A magnetic map was produced showing local variations. The SkyLance flew over a zinc deposit with 3 magnetic anomalies. It produced repeatable data that compared well with upward continuation maps of ground magnetic data. ii Statement of Originality I certify that the material presented in this thesis is my own work. Chapter 3 - UAS Capabilities, is based on a paper submitted to Unmanned System Canada for their student papers competition (Cunningham and Samson, 2015). I am the first author of this paper which was later presented at the Unmanned Systems Canada Conference. The material within this chapter is fully my own work.
    [Show full text]
  • Use of Airborne, Surface, and Borehole Geophysical Techniques at Contaminated Sites
    United States Office of Research and EPA/625/R-92/007 Environmental Protection Development September 1993 Agency Washington DC 20460 EPA Use of Airborne, Surface, and Borehole Geophysical Techniques at Contaminated Sites A Reference Guide Technology Transfer EPA/625/R-92/O07 USE OF AIRBORNE, SURFACE, AND BOREHOLE GEOPHYSICAL TECHNIQUES AT CONTAMINATED SITES: A REFERENCE GUIDE September 1993 Prepared by: Eastern Research Group 110 Hartwell Avenue Lexington, MA 02173 FOr: Office of Science Planning and Regulatory Evaluation Center for Environmental Research Information U.S. Environmental Protection Agency 26 West Martin Luther King Drive Cincinnati, OH 45268 Printed on Recycled Paper Notice This document has been reviewed in accordance with the U.S. Environmental Protection Agency’s peer and administrative review policies and approved for publication. Mention of trade names or commercial products does not consitute endorsement or recommendation for use. TABLE OF CONTENTS PAGE List of Tables . .iv List of Figures . .vi Acknowledgments . .vii Glossary of Abbreviations . .viii Preface . .ix CHAPTER 1 OVERVIEW . .1-1 1.1 General Terminology . .1-1 1.2 Uses of Geophysical Methods . ..1-3 1.3 General Characteristics of Geophysical Methods . 1-4 1.3.1 Airborne, Surface, and Downhole Methods . .1-4 1.3.2 Natural versus Artificial Field Sources . .1-9 1.3.3 Measurement of Geophysical Properties . 1-9 1.4 Introduction to the Geophysical Literature . 1-14 1.4.1 General Geophysics . .1-14 1.4.2 Ground Water and Contaminated Sites . 1-14 1.4.3 Evaluation of Literature References . 1-23 1.4.4 Use of Reference Index Tables in This Guide .
    [Show full text]
  • Design and Development of a Magnetic Anomaly Detection Unmanned Aerial Vehicle
    Design and Development of a Magnetic Anomaly Detection Unmanned Aerial Vehicle Bruno Miguel Wong Luís Thesis to obtain the Master of Science Degree in Aerospace Engineering Supervisor: Prof. Afzal Suleman Examination Committee Chairperson: Prof. Fernando José Parracho Lau Supervisor: Prof. Afzal Suleman Member of the Committee: Dr. Frederico José Prata Rente Reis Afonso November 2019 ii Dedicated to my parents. This work was only made possible through their continued love and support, which made the distance between Canada, Portugal and China seem much smaller. iii iv Acknowledgments The completion of this work was accomplished with a large amount of support from individuals and organizations. First of all, I would like to thank my supervisor, Professor Afzal Suleman, for believing in me from the beginning and providing me the opportunity for growth and professional development throughout the project. I would also like to thank him for bringing me to Canada where I had the chance of getting to know a new culture and new people. On the Center for Aerospace Research design team, I’d like to thank everyone who helped me throughout my work. In particular, I would like to thank Dr. Jose´ Vale. His knowledge, experience, leadership and availability were of utmost importance for the completion of this work. I recall all the countless hours spent by him and all his patience trying to explain me the best way to tackle a certain problem. Furthermore, Dr. Max Rukosuvev and Sean Bazzocchi also supported me a lot during my thesis. Dr. Max Rukosuvev kindly clarified all my doubts about mechanical design and Sean Bazzocchi kindly clarified all my doubts about control and avionics.
    [Show full text]
  • Geologic Interpretation of an Aeromagnetic Survey of the Iron Springs District, Utah
    Geologic Interpretation ofan Aeromagnetic Survey of the Iron Springs District, Utah GEOLOGICAL SURVEY PROFESSIONAL PAPER 516-B Geologic Interpretation ofan Aeromagnetic Survey of the Iron Springs District, Utah By H. RICHARD BLANK, Jr., and J. HOOVER MACKIN G E 0 P H Y S I C A L F I E L D I NiVjEfS)T I G AT I 0 N S GEOLOGICAL SURVEY PRO.FE!SSIONAL PAPER 516-B UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1967 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 CONTENTS Page Page Abstract__________________________________________ _ B1 Interpretation of the aeromagnetic map-Continued Introduction--------------------------------------- 1 Three Peaks area-Continued General geology ___________________________________ _ 1 Local anomalies ___________________________ _ B10 Itock units ____________________________________ _ 1 Granite Mountain area ______ -------------- __ ---- 10 Ore deposits ___________________________________ _ 3 Geometry of the intrusion ______ -----_------- 10 Magnetic properties of the rocks _____________________ _ 3 Local anomalies ___________________________ _ 11 The aeromagnetic survey __ ------------- _______ ------ 4 Southwest termination ______ ----- _____ ------ 11 Interpretation of the aeromagnetic map ______________ _ 4 Iron Mountain area____________________________ _ 12 Three Peaks area ______________ ---------- ______ _ 6 Geometry of the intrusion___________________ _ 12 Outline of the intrusion_____________________ _ 6 Local anomalies ___________________________ _ 12 Thickness of the intrusive body-----_________ _ 6 Summary and Conclusions_--------------- __________ _ 13 Iteferences ________________________________________ _ East fault __________ ------------------------ 8 13 ILLUSTRATIONS PLATE 1. Aeromagnetic and generalized geologic map of the Iron Springs district, Utah---------------------------~ In pocket Page FIGURE 1.
    [Show full text]
  • Geophysical Methods for Evaluation of Plutonic Rocks
    AECL-8409 ATOMIC ENERGY L’ENERGIE ATOMIQUE OF CANADA LIMITED DU CANADA, LIMITEE GEOPHYSICAL METHODS FOR EVALUATION OF PLUTONIC ROCKS METHODES GEOPHYSIQUES POUR DEVALUATION DES ROCHES PLUTONIQUES compiled by / compilee par R. A. Gibb, J. S. Scott Whiteshell Nuclear Research Etablissement de recherches Establishment nucleaires de Whiteshell Pinawa, Manitoba ROE 1 LO April 1986 avril Copyright © Atomic Energy of Canada Limited, 1986 ATOMIC ENERGY OF CANADA LIMITED GEOPHYSICAL METHODS FOR EVALUATION OF PLUTONIC ROCKS Compiled by R.A. Gibb and J.S. Scott Whiteshell Nuclear Research Establishment Pinawa, Manitoba ROE 1L0 1986 April AECL-8409 METHODES GEOPHYSIQUES POUR L"EVALUATION DES ROCHES PLUTONIQUES Compile par R.A. Gibb et J.S. Scott RESUME On dScrit systSmatiquement des m€thodes gSophysiques salon le principe physique et le mode opiratoire de chaque mSthode, le type de reseignement produit, les limites de nature technique et/ou Sconomique et 1'applicabiliti de 1'Evaluation de la masse rocheuse dans les zones de recherches od ont lieu les travaux du Programme de Gestion des D€chets de Combustible Nucliaire. Les mSthodes gSophysiques se divisent en trois categories: (1) lev6s a€roport€s et autres lev6s d'exploration, (2) levSs (terrestres) precis ou superficiels et (3) lev&s en Bondages ou souterrains. On rSsume les rSles possibles de chaque m6thode dans les processus de selection et d'evaluation des sites conduisant au choix d’un site d'evacuation. L'Energie Atomique du Canada, Limit6e Etablissement de recherches nucleaires de Whiteshell Pinawa, Manitoba ROE 1L0 1986 avril AECL-8409 GEOPHYSICAL METHODS FOR EVALUATION OF PLUTONIC ROCKS Compiled by R.A.
    [Show full text]
  • AEROMAGNETIC, INTERPRETATION and MINERAL .INVESTIGATIONS in the EZINE, Ganakkale-KARABIGA, MARMARA, and KAPIDAG AREAS of NORTHWESTERN" "TURKEY
    ~ J Turkey Investigation Report (IR) TU-4 AEROMAGNETIC, INTERPRETATION AND MINERAL .INVESTIGATIONS IN THE EZINE, gANAKKALE-KARABIGA, MARMARA, AND KAPIDAG AREAS OF NORTHWESTERN" "TURKEY H* S. Jacobson U. S. Geological Survey and F. Ozelci, D. Yazgan, N. Hatay, and H. Karachacioglu Mineral Research and Exploration Institute of Turkey U. S. Geological Survey OPEN PILE REPORT This report is preliminary and has not been edited or reviewed for .conformity with. Geological Survey standards or nomenclature 1972 AEROMAGNETIC INTERPRETATION AND MINERAL INVESTIGATIONS IN THE EZINE, QANAKKALE-KARABiGA, MARMARA, AND KAPIDAG AREAS OF NORTHWESTERN TURKEY by H. S. Jacobson U. S. Geological Survey and F. Ozelci, D. Yazgan, N. Hatay, and H. Karachacxoglu Mineral Research and Exploration Institute of Turkey AEROMAGNETIC INTERPRETATION AND MINERAL INVESTIGATIONS IN THE EZINE, gANAKKALE-KARABIGA, MARMARA, AND KAPIDA& AREAS OF NORTHWESTERN TURKEY By H. S. Jacobson and F. Ozelci, D. Yazgan, N. Hatay, and H. Karachacioglu Mineral Research and Exploration Institute of Turkey ABSTRACT Aeromagnetic surveys and mineral investigations are planned or in progress in ten areas of northwestern Turkey (fig. 1). This report reviews results obtained from August 1967 to January 1, 1968, through aeromagnetic interpretation and field investigations in four of the areas (Areas 2,3,4 and 5). Aeromagnetic interpretation identified 27 prominent anomalies, 17 of which were checked in the field. The majority of these anomalies were found to be caused by minor amounts of magnetite in igneous rocks, including granite stocks, mafic flows, and mafic dikes. Other anomalies are caused by magnetite in metamorphic rocks or by topographic effects. However, massive magnetite boulders were observed in three adjoining localities (Anomalies E2, E3, and E4, fig.
    [Show full text]
  • The Estimation of Magnetite Prospective Resources Based on Aeromagnetic Data: a Case Study of Qihe Area, Shandong Province, China
    remote sensing Article The Estimation of Magnetite Prospective Resources Based on Aeromagnetic Data: A Case Study of Qihe Area, Shandong Province, China Xiuhe Gao 1,2,3, Shengqing Xiong 1,2,*, Changchun Yu 1,2, Dishuo Zhang 1,2 and Chengping Wu 1,2 1 China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China; [email protected] (X.G.); [email protected] (C.Y.); [email protected] (D.Z.); [email protected] (C.W.) 2 Key Laboratory of Airborne Geophysics and Remote Sensing Geology, Ministry of Natural Resources, Beijing 100083, China 3 School of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing 100029, China * Correspondence: [email protected]; Tel.: +86-010-6206-0135 Abstract: In the Qihe area, the magnetic anomalies caused by deep and concealed magnetite are weak and compared with ground surveys, airborne surveys further weaken the signals. Moreover, the magnetite in the Qihe area belongs to a contact-metasomatic deposit, and the magnetic anomalies caused by the magnetite and its mother rock overlap and interweave. Therefore, it is difficult to directly delineate the target areas of magnetite according to the measured aeromagnetic maps in Qihe or similar areas, let alone estimate prospective magnetite resources. This study tried to extract magnetite-caused anomalies from aeromagnetic data by using high-pass filtering. Then, a preliminary estimation of magnetite prospective resources was realized by the 3D inversion of the extracted anomalies. In order to improve the resolution and accuracy of the inversion results, a combined Citation: Gao, X.; Xiong, S.; Yu, C.; model-weighting function was proposed for the inversion.
    [Show full text]
  • Interpretation & Geodatabase of Dykes Using Aeromagnetic Data Of
    Interpretation & Geodatabase of Dykes Using Aeromagnetic Data of Zimbabwe and Mozambique Tesfaye Kassa Mekonnen March, 2004 Interpretation & Geodatabase of Dykes Using Aeromag- netic Data of Zimbabwe and Mozambique by Tesfaye Kassa Mekonnen Thesis submitted to the International Institute for Geo-information Science and Earth Observation in partial fulfilment of the requirements for the degree of Master of Science in Geo-information Science and Earth Observation, APPLIED GEOPHYSICS. Degree Assessment Board Dr. K. Hein External examiner(UU) Prof. Dr. F.D.van der Meer Chair, ESA, ITC Dr. Paul van Dijk Programme director, ESA, ITC Prof. Dr. C.V.Reeves 1st supervisor, ESA, ITC Dr. T. Woldai 2nd supervisor, ESA, ITC INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION ENSCHEDE, THE NETHERLANDS Interpretation & Geodatabase of Dykes Using Aeromagnetic Data of Zimbabwe and Mozambique Disclaimer This document describes work undertaken as part of a programme of study at the International Institute for Geo-information Science and Earth Observation. All views and opinions expressed therein remain the sole responsibility of the author, and do not necessarily represent those of the institute. 1 Interpretation & Geodatabase of Dykes Using Aeromagnetic Data of Zimbabwe and Mozambique Abstract The capability of modern aeromagnetic anomaly mapping becomes apparent in providing information about the geology especially where rock outcrop are scares or absent. Mafic dykes have significant expression on magnetic anomaly maps that covers now almost land area of the world. Storing the various trends of dyke in a relational geodatabase can help discover their implication for the tectonic events which still need to be answered by displaying on their age, strike direction, composition and by classifying them in swarms.
    [Show full text]