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  • 1
    Online Resource
    Online Resource
    Amsterdam :Elsevier,
    Keywords: Rifts (Geology) -- Africa, East -- Congresses. ; Electronic books.
    Description / Table of Contents: Developments in Geotectonics, 7: East African Rifts focuses on the movements, structure, and behavior of the East African rift system. The selection first offers information on the surface structure and plate tectonics of Afar; tectonic and magmatic significance of volcanism in the Afar depression; and preliminary interpretation of the gravity field of Afar, northeast Ethiopia. Discussions focus on crustal models of Afar based on gravity and seismic data, tectonics, volcanism, geological setting, and crustal extension. The text also elaborates on the gravity survey of the central part of the Ethiopian Rift Valley and an aeromagnetic survey of the Afar triangle of Ethiopia. The book examines the arrangement and development of continental rift zones, East African rift development, and the seismicity of the East African rift system. Topics include earthquake mechanisms, seismicity, and the main categories of rift zones. The manuscript is a dependable reference for readers interested in the East African rifts.
    Type of Medium: Online Resource
    Pages: 1 online resource (187 pages)
    Edition: 1st ed.
    ISBN: 9781483257150
    DDC: 551.87
    Language: English
    Note: Front Cover -- East African Rifts -- Copyright Page -- Table of Contents -- LIST OF AUTHORS -- FOREWORD -- CHAPTER 1. SURFACE STRUCTURE AND PLATE TECTONICS OF AFAR -- ABSTRACT -- INTRODUCTION -- GEOLOGICAL SETTING -- STRUCTURE -- CRUSTAL EXTENSION IN AFAR -- AFAR AND PLATE TECTONICS -- REFERENCES -- CHAPTER 2. VOLCANISM IN THE AFAR DEPRESSION: ITS TECTONIC AND MAGMATIC SIGNIFICANCE -- ABSTRACT -- TECTONICS -- VOLCANISM -- CONCLUSIONS -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 3. A PRELIMINARY INTERPRETATION OF THE GRAVITY FIELD OF AFAR, NORTHEAST ETHIOPIA -- ABSTRACT -- INTRODUCTION -- COMPILATION OF THE BOUGUER MAP -- A QUANTITATIVE INTERPRETATION OF THE BOUGUER MAP -- CRUSTAL MODELS OF AFAR BASED ON GRAVITY AND SEISMIC DATA -- CONCLUSIONS -- ACKNOWLEDGMENTS -- REFERENCES -- CHAPTER 4. A GRAVITY SURVEY OF THE CENTRAL PART OF THE ETHIOPIAN RIFT VALLEY -- ABSTRACT -- SUMMARY -- INTRODUCTION -- DATA -- INTERPRETATION -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 5. AN AEROMAGNETIC SURVEY OF THE AFAR TRIANGLE OF ETHIOPIA -- ABSTRACT -- REFERENCES -- CHAPTER 6. LOCAL EARTHQUAKE PHASES OBSERVED AT ADDIS ABABA, ETHIOPIA -- ABSTRACT -- SUMMARY -- REFERENCES -- CHAPTER 7. SEISMIC PROFILES IN THE DJIBOUTI AREA -- ABSTRACT -- INTRODUCTION -- DESCRIPTION OF THE EXPERIMENT -- RESULTS -- INTERPRETATION -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 8. CONTINENTAL RIFT ZONES: THEIR ARRANGEMENT AND DEVELOPMENT -- ABSTRACT -- INTRODUCTION -- MAIN CATEGORIES OF RIFT ZONES -- MAIN TYPES OF CONTINENTAL RIFT ZONES -- RIFTS AND RIFT LIKE BELTS -- INTERRELATIONS BETWEEN GEOSYNCLINAL-OROGENIC BELTS AND RIFT BELTS -- PRE-CENOZOIC RIFT ZONES AND BELTS -- REFERENCES -- CHAPTER 9. EAST AFRICAN RIFT DEVELOPMENT -- ABSTRACT -- INTRODUCTION -- THE GREGORY RIFT -- THE WESTERN RIFT -- CONCLUSION -- ACKNOWLEDGEMENTS -- REFERENCES. , CHAPTER 10. THE KENYA RIFT VOLCANICS: A NOTE ON VOLUMES AND CHEMICAL COMPOSITION -- ABSTRACT -- INTRODUCTION -- DISTRIBUTION AND VOLUMES -- CHEMICAL COMPOSITIONS -- SUMMARY AND CONCLUSIONS -- REFERENCES -- CHAPTER 11. A GEOCHEMICAL STUDY OF SILALI VOLCANO, KENYA, WITH SPECIAL REFERENCE TO THE ORIGIN OF THE INTERMEDIATE ACID ERUPTIVES OF THE CENTRAL RIFT VALLEY -- ABSTRACT -- INTRODUCTION -- THE ERUPTIVITY OF THE CENTRAL GREGORY RIFT VALLEY -- SUMMARY OF THE GEOLOGY OF SILALI -- GEOCHEMISTRY -- DISCUSSION -- CONCLUSIONS -- ACKNOWLEDGEMENT -- REFERENCES -- CHAPTER 12. THE SEISMICITY OF THE EAST AFRICAN RIFT SYSTEM -- ABSTRACT -- INTRODUCTION -- SEISMICITY -- EARTHQUAKE MECHANISMS -- TRAVEL-TIME DELAYS -- TRAVEL TIME DELAYS AND GRAVITY ANOMALIES -- REFERENCES -- CHAPTER 13. STUDY OF MICROEARTHQUAKES IN THE RIFT ZONES OF EAST AFRICA -- ABSTRACT -- INTRODUCTION -- LOCATIONS AND TECHNIQUES -- RESULTS -- CONCLUSIONS -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 14. GRAVITY AND MAGNETIC SURVEYS IN NORTHERN TANZANIA AND SOUTHERN KENYA -- ABSTRACT -- INTRODUCTION -- THE GRAVITY SURVEY -- INTERPRETATION OF THE GRAVITY ANOMALIES -- CONCLUSIONS -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 15. REPORT ON AIRMAGNETIC SURVEYS OF TWO AREAS IN THE KENYA RIFT VALLEY -- ABSTRACT -- INTRODUCTION -- PLANNING OF THE AIRMAGNETIC SURVEY -- AIRMAGNETIC SURVEY OF THE LAKE MAGADI AREA -- AIRMAGNETIC SURVEY OF THE LAKE HANNINGTON AREA -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 16. SOME COMMENTS ON THE RESULTS OF A SEISMIC REFRACTION EXPERIMENT IN THE KENYA RIFT -- ABSTRACT -- STRUCTURE -- SEISMIC REFRACTION EXPERIMENTS -- INTERPRETATION -- CONCLUSION -- REFERENCES -- CHAPTER 17. RAYLEIGH WAVE PHASE VELOCITIES FOR THE PATH ADDIS ABABA-NAIROBI -- ABSTRACT -- INTRODUCTION -- ANALYSIS AND INTERPRETATION -- REFERENCES. , CHAPTER 18. THE STRUCTURE OF EAST AFRICA USING SURFACE WAVE DISPERSION AND DURHAM SEISMIC ARRAY DATA -- ABSTRACT -- INTRODUCTION -- THE GENERAL STRUCTURE OF EAST AFRICA -- SEISMIC ARRAY DATA -- CONCLUSIONS -- ACKNOWLEDGEMENTS -- REFERENCES -- CHAPTER 19. HEAT FLOW MEASUREMENTS IN EAST AFRICA -- ABSTRACT -- REFERENCES -- INTERNATIONAL UPPER MANTLE COMMITTEE -- UPPER MANTLE PROJECT - REPORTS -- SCIENTIFIC REPORTS -- REPORTS OF THE INTERNATIONAL UPPER MANTLE COMMITTEE.
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  • 2
    Type of Medium: Book
    Pages: Seite 1-417, Seite Tafel 1-4, 6-7, 9-14, 17-18, Blatt Tafel 5, 8, 15-16, 19-20, 2 ungezählte gefaltete Seiten , Illustrationen, Diagramme, Karten , 6 gefaltete Karten
    Series Statement: Philosophical transactions of the Royal Society of London number 1181 = volume 267 (1970)
    Language: English
    Note: Umschlagtitel
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  • 3
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    Unknown
    PANGAEA
    Publication Date: 2023-05-12
    Keywords: Area/locality; Conductivity, average; Depth, bottom/max; Depth, top/min; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Number of temperature data; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 74 data points
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  • 4
    Publication Date: 2023-05-12
    Keywords: Conductivity, average; Depth, bottom/max; Depth, top/min; ELEVATION; Heat flow; LATITUDE; LONGITUDE; Method comment; Number; Number of conductivity measurements; Number of temperature data; Sample, optional label/labor no; Temperature gradient
    Type: Dataset
    Format: text/tab-separated-values, 39 data points
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  • 5
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Whitmarsh, Robert B; Weser, Oscar E; Ross, David A; Syed, A; Boudreaux, J E; Coleman, R G; Fleisher, R L; Girdler, R W; Jipa, D; Kidd, Robert B; Mallik, Tapas Kumar; Manheim, Frank T; Matter, A; Nigrini, Catherine A; Siddiquie, H N; Stoffers, Peter; Supko, Peter R (1974): Site 221. In: Whitmarsh, R.B.; Weser, O.E.; Ross, D.A.; et al., Initial Reports of the Deep Sea Drilling Project, Initial Reports of the Deep Sea Drilling Project, U.S. Government Printing Office, XXIII, 167-210, https://doi.org/10.2973/dsdp.proc.23.105.1974
    Publication Date: 2023-08-28
    Description: Located on the Arabian Abyssal Plain near its southernmost termination, this site recorded continuous Middle Eocene through Pleistocene deep-water sedimentation above oceanic basalt. A chert layer is developed at the base of the Eocene strata. The Eocene through Miocene sequence shows the transition from biogenic ooze to brown clay sedimentation which typifies depositional sites as they move from a ridge crest to a deep-ridge flank position. Above this sequence is an undifferentiated Pliocene-Miocene through Pleistocene interval of terrigenous and calcareous turbidites. The former were derived from the Indus Canyon, and the latter from elsewhere.
    Keywords: 23-221; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Indian Ocean/Arabian Sea/PLAIN; Leg23; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 6
    Publication Date: 2023-08-28
    Keywords: 23-221; Comment; Deep Sea Drilling Project; Deposit type; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Identification; Indian Ocean/Arabian Sea/PLAIN; Leg23; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Quantity of deposit; Sample code/label; Sediment type; Visual description
    Type: Dataset
    Format: text/tab-separated-values, 16 data points
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  • 7
    Publication Date: 2023-08-28
    Keywords: 23-221; Chromium; Copper; Deep Sea Drilling Project; DEPTH, sediment/rock; Description; DRILL; Drilling/drill rig; DSDP; Glomar Challenger; Identification; Indian Ocean/Arabian Sea/PLAIN; Iron; Leg23; Manganese; Nickel; NOAA and MMS Marine Minerals Geochemical Database; NOAA-MMS; Position; Sample code/label; Vanadium; Visual description; Wet chemistry
    Type: Dataset
    Format: text/tab-separated-values, 20 data points
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 198 (1963), S. 1037-1039 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a recent article1, Prof. Tuzo Wilson uses the geographical distribution of the world rift system in reaching the conclusion that one long, cylindrical convection cell "twisted about the Earth" exists in the mantle. Earlier2, I used the distribution of the world rift system as observational ...
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 540-541 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The results are especially interesting as the sands which are exposed in various localities extending from the Dorset coast to the Cotswold Hills are all litho-logically similar, and Boswell directed attention to the remarkable constancy of their mineral content and fine grade. In view of this and ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 521-524 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING the past few years, geophysicists have revived interest in the possibility that the continents may have drifted relative to the poles and relative to one another. The revival of interest is largely due to the results of work on palseomagnet-ism1'2; but it is significant that contributions ...
    Type of Medium: Electronic Resource
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