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  • Intergovernmental Oceanographic Commission technical series

    46

    Equatorial Segment of the Mid-Atlantic Ridge

    Initial Results of the Geological and Geophysical Investigations under the EQUARIDGE Program, Cruises of r/v ‘Akademik Nikolaj Strakhov’ in 1987, 1990, 1991

    Editor: G.B. Udintsev

    UNESCO 1996

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  • The designations employed and the presentation of the material in this publication do not imply the expression of any opinion whatsoever on the part of the Secretariats of UNESCO and IOC concerning the legal status of any country or territory, or its authorities, or concerning the delimitations of the frontiers of any country or territory.

    For bibliographic purposes, this document should be cited as follows: Equatorial Segment of the Mid-Atlantic Ridge IOC Technical Series No. 46, UNESCO 1996 (English)

    Published in 1996 by the United Nations Educational, Scientific and Cultural Orgarnization 7, place de Fontenoy, 75352 Paris 07 SP

    Printed in UNESCO’s Workshops

    © UNESCO 1996 Printed in France

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  • TABLE OF CONTENTS

    Abstract

    Acknowledgements

    Introduction

    Chapter 1-

    Chapter 2-

    Chapter 3-

    Chapter 4-

    Chapter 5-

    Chapter 6-

    Chapter 7-

    Chapter 8-

    Chapter 9-

    Chapter 10-

    chapter 11-

    Chapter 12-

    Chapter 13-

    Chapter 14-

    Chapter 15-

    Chapter 16-

    G.B. Udintsev, J. Makris

    Features of the Topography of the Ocean Floor in the Equatorial Atlantic. G.B. Udintsev

    Topography of the Equatorial Segment of the Mid-Atlantic Ridge After Multi-Beam Echo-sounding. G.B. Udintsev, J. Hall, V.G. Udintsev, A.B. Knjazev

    Topography of the Rift Zone and Some Parts of the Fracture Zones in the Equatorial Segment. G.V. Agapova

    The Structure of Sedimentary Cover from Single-Channel Seismic Profiling Data. V.N. Efimov, A.V. Koltsova, A.F. Beresnev, V.M. Golod, S. Yu. Sokolov, M. V. Sakharov

    Tectonics Deformations within the Mid-Atlantic Ridge and a model of their genesis. M.P. Antipov

    The Crustal Structure and Seismicity of the Equatorial Segment in the Strakhov and St. Peter Fracture Zones Area. M.V. Zakharov, B.N. Grinko, J. Makris, U. Vogt, T. Funk

    Structure of the Sierra Leone Rise on the Eastern Flank of the Equatorial Segment and Guinea Plateau of the Continental Margin of West Africa. A. Ju. Yunov et. al.

    Gravity Field of the Equatorial Segment. V.M. Golod

    Manifestation of Tectonic and Petrochemical Segmentation during the Development of the Equatorial Zone of the Mid-Atlantic Ridge. N.A. Sushchevskaja, L.P. Volokitina, M.M. Morozova, M.M. Fuguan

    Igneous Reeks from the Equatorial Atlantic. P.I. Fedorov, B.P. Zolotarev, V.A. Gutsaki

    Magmatic Basement of the Equatorial Segment. N.A. Kurentsova, V.M. Tchubarov

    Ultrabasic Mylonites of St. Paul Island. E. A. Denisova

    Native Metals in the San Paulo Fault Basalts of the Atlantic Ocean. L.E. Shterenberg et. al.

    New Data of Pleistocene Stratigraphy and Paleoceanology of the Equatorial Atlantic. N.S. Oskina, O.V. Dmitrenko

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    Reeks with Anomalous Age or Origin in the Equatorial Atlantic - Review. I. A. Basov 69

    Finds of Reeks of Continental Type and Sediments of Anomalous Age on the Equatorial Segment of the Mid-Atlantic Ridge (MAR). G.B. Udintsev, N.A. Kurentsova, N.V. Pronina, S.B. Smirnova, M.G. Ushakova 76

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  • Chapter 17-

    Chapter 18-

    Chapter 19-

    Chapter 20-

    Chapter 21-

    Chapter 22-

    Conclusion -

    References

    Appendices

    Plate

    1 2 3 4 5 6 ‘7 8 9 10

    11 12 13

    14

    15

    (ii)

    Phyllites of the Equatorial Segment of the Mid-Atlantic Ridge. A.N. Fenogenov

    Plutonic and Metamorphic Reeks in the Crestal Zone of the Mid-Atlantic Ridge: on the Problem of Composition and Age of the Lower Horizons of the Oceanic Crust. A.I. Trukhalev, Ju. E. Pogrebitskij, B.V. Belyatskij, N.A. Kurentsova, I.M. Vasilieva.

    The Structure and Composition of a Coal Shale Fragment from the Equatorial Atlantic. L.E. Shterenberg, R.N. Smirnov, A.P. Sokolova

    Relics of Continental Lithosphere in the Atlantic by Data of (Th/U)th, (Th/U)Pb, and K/Ti Systematics. N.A. Titayeva, Yu. V. Mironov

    Residual Peridotites from the 15-20 Mid-Atlantic Fracture Zone - A Possible Analogy of the Ancient Metasomotized Mantle below St. Paul Reeks. S.A. Silantyev, L.V. Dmitriev, B.A. Bazilev, L.K. Levsky, J.F. Casey, H. Bougault

    The Origin and the History of the Development of the Equatorial Segment of the Mid-Atlantic Ridge. G.B. Udintsev

    Segmentation of the Mid-oceanic Ridges and Heterogeneity of the Ocean Floor. G. B. Udinstev

    Contained in the Atlas “Equatorial Segment of the Mid-Atlantic Ridge, Maps and Profiles”

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    Introductory Section

    Topography of the Equatorial Segment of the Mid-Atlantic Ridge Contents and R/V “Akademik Nikolai Strakhov” Tracks of 7.11.12 Cruises General Scheme Equatorial Atlantic. Bathymetric Map (Fragments of GEBCO Sheets 5.08 and 5. 12). Tectonic Scheme Topography of the Equatorial Segment of the Mid-Atlantic Ridge Bottom Surface Inclination Bottom Topography. 12th Cruise of R/V “Akademik Nikolaj Strakhov”. Polygon Bottom Topography. 12th Cruise of R/V “Akademik Nikolaj Strakhov”. Polygon Map of the thickness of Sedimentray Cover. St. Paulo Fracture Zone Acrostic Basement Topography Acoustic Basement Morpho-structural Scheme Ocean Floor Morpho-structural Scheme Satellite Free Air Gravity Anomaly Map and Ship-Born Free Air Gravity Anomaly Map Mantle Bouger Gravity Anomaly. Bouger Gravity Anomaly Deep Seismic Profiling Reflection and Refraction. Position of Seismic Reflection and Refraction Profile in St, Peter Fracture Zone. Strakhov Fracture Zone Intersection with Southern Rift. 3D Simulation. Ocean Bottom Seismographs Reeds. Earthquake Epicenters in the Strakhov Fracture Zone Intersection with the Northern Rift. Hypocenter Depth and Earthquake. Magnitude in the Strakhov Fracture Zone Intersection with the Northern Rift. Earthquake Hypocenters and Magnitude on the Section along the Northern Rift Axes. Magnetic Survey

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  • (iii)

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    24-25 26 27 28

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    31 32 33

    Geological Stations 7, 11, 12 R/V “Akademik Nikolaj Strakhov-’ Bed Rocks and Sediments Rocks with Anomalous Age and Origin (Chapter 15) The Sierra Leone Rise (Chapter 7) The Guinea Plateau (Chapter 7). The Topography of the Rift Zone and Some Parts of the Fracture Zones in the Equatorial Segment (Chapter 3) Manifestation of Tectonic and Petrochemical Segmentation during the Development of the Equatorial Zone of the Mid-Atlantic Ridge (Chapter 9) Igneous Rocks from the Equatorial Atlantic (Chapter 10) Magmatic Basement of the Equatorial Segment (Chapter 11) Ultrabasic Mylonites of the St. Paul Island (Chapter 12) New Data on Pleistocene Stratigraphy and Paleontology of the Equatorial Atlantic (Chapter 14) Phyllites of the Equatorial Segment (Chapter 17) Plutonic and Metamorphic Rocks in the Crestal Zone (Chapter 18) The Structure and Composition of a Coaly Shale (Chapter 19) Relicts of Continental Lithosphere in the Atlantic by Data (Th/U)Th, (Th/U)Pb, and K/Ti Systematic Data (Chapter 20) Residual Peridotites from the 15-20°Fracture Zone. Central Atlantic - A possible Analogy of the Ancient Metasomatized Mantle Below St. Paul Rocks (Chapter 21 ). Underway Survey Tracks to Brazilian Ports (7, 12 Cruises) Polygons of 7, 11, 12 Cruises of R/V “Akademik Nikolaj Strakhov’. Seismic Sections R/V “Akademik Nikolaj Strakhov” Equatorial Segment. General Section The St. Paul Fracture Zone Inter-rift Part. Polygon Survey The Strakhov Fracture Zone. Polygon Survey Rift Zone Between Strakhov and St. Peter Fracture Zones and Plateau Western Flank. Polygon Survey The East Flank Plateau Between Strakhov and St. Paul Fracture Zones. Polygon Survey Eastern Part of the Strakhov Zone, Rift Zone and Eastern Part Flank Plateau to the South of the Strakhov Fracture Zone. Polygon Survey Rift Zone and Flank Plateau to the North of the Strakhov Fracture Zone. Polygon Survey Rift Zone. Flank Plateau Between St. Peter and St. Paul Fracture Zones. Polygon Survey General Section Across the Brazil Basin to Continental Margin of Brazil

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  • ABSTRACT

    The Equatorial Segment of the Mid-Atlantic Ridge is a part of t