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Monday, April 27, 2020 | History

2 edition of Mapping of the major structures of the African rift system found in the catalog.

Mapping of the major structures of the African rift system

Paul A. Mohr

Mapping of the major structures of the African rift system

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  • 5 Currently reading

Published by Smithsonian Institution, Astrophysical Observatory in Cambridge, Mass .
Written in English

    Places:
  • Great Rift Valley.,
  • Africa, Eastern.
    • Subjects:
    • Geological mapping -- Africa, Eastern.,
    • Rifts (Geology),
    • Geology -- Africa, Eastern.,
    • Great Rift Valley.

    • Edition Notes

      StatementP. A. Mohr.
      SeriesSAO special report ;, no. 361
      Classifications
      LC ClassificationsTL796.A1 S6 no. 361, QE36 S6 no. 361
      The Physical Object
      Paginationix, 70 p., [8] leaves of plates :
      Number of Pages70
      ID Numbers
      Open LibraryOL4952821M
      LC Control Number76381042

      The next time you teach plate tectonics, consider a draw-with-me presentation that will engage your students and help them understand the spatial and movement aspects of plate boundary environments. The process of drawing a picture involves students much more deeply than reading or discussion. This. rift. These calderas are located along the Wonji Fault Belt (WFB), a zone of Quaternary NNVSSW normal faults and extensional fractures. The three calderas show E—W elongation and major E—W vent alignments, oblique with regard to the mean NW—SE extension direction. No significant evidence of E—W tectonic structures has been found.


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Mapping of the major structures of the African rift system by Paul A. Mohr Download PDF EPUB FB2

Ix mapping of the major structures of the african rift system p. mohr 1. INTRODUCTION This report deals in outline with the results of the author's mapping of African Mapping of the major structures of the African rift system book structures from ERTS-1.

This book presents a variety of mapping and cross section techniques. It covers mapping techniques for four major petroleum tectonic settings: extensional, compressional wrench, and diapiric : Duncan Macgregor.

structures in the African rifts is seen to have been exaggerated. INTRODUCTION Unified mapping of regional structures of the African rift system (Figure 1) on a scale of 1:l nrillion has been completed except for a few persistently cloud-covered areas. The mapping has been done by direct tracing from cm square black-and-whlte prints.

The location of the East African rift system was influenced by the preexisting lithospheric structure (e.g., McConnell, ). The Western, Eastern, and Main Ethiopian, and Afar rifts developed in Archaean to late Proterozoic continental lithosphere, and largely within the Pan-African orogenic belt (Fig.

The age and structure of crystalline basement beneath the Ethiopian, southern Red Sea, Mapping of the major structures of the African rift system book western. The East African rift system is a continental active rift system spanning the boundary between the diverging Nubian and Somali plates.

It is made up of a series of graben basins, which are connected by transform fault zones. It is composed of a Western and Eastern branch, which split off from the Afar Triple Junction in the north. The East African Rift System (‘EARS’) represents the world’s best example of an active rift system, although its deep origins remain poorly understood.

The objective of this review paper is therefore to integrate the voluminous literature on the EARS with partially released subsurface well data, in order to compile a series of mapsFile Size: 6MB.

Sedimentation in the African Rifts EDITED BY GROVE, A.T. Geomorphology of the African Rift System. African Rift Basin Development FAIRHEAD, J.D. Geophysical controls on sedimentation within the African Rift Systems.

The main aim of the meeting and of this book is to provide an opportunity for the presentation of. The East African Rift System, with Mapping of the major structures of the African rift system book length of about 4, miles (6, km) and with an average width of 30–40 miles (48–64 km), is one of the most far-reaching rifts in the world.

It runs from the Middle Eastern country of Jordan in the north and heads south through eastern Africa before ending in the southeastern African county of. UNESCO – EOLSS SAMPLE CHAPTERS GEOLOGY – Vol. IV – The Geological Evolution of Africa - Paul H.G.M.

Dirks, Tom G. Blenkinsop and Dr. Hielke A. Jelsma ©Encyclopedia of Life Support Systems (EOLSS) The West Africa Craton Mapping of the major structures of the African rift system book West Africa Craton ( million km2 Archean; million km2 Paleoproterozoic) in NW Africa consists of the Reguibat and (Leo-) Man Shields in the N and S of theFile Size: KB.

Start studying GSP Learn vocabulary, terms, and more with flashcards, games, and other study tools. The East African Rift System was formed through which of the following geologic activities. The Aryan social structure consisted of what three major groups. Priests, Warriors and Herders.

The author’s thesis, that Africa is experiencing (or will have) a rift – by which he means a break with its past into freedom, is presented in a narrative that is part travelogue, war correspondence, history and political and social commentary.

Alex Perry, in covering so many countries in so many aspects, /5. East African Rift System The major active aulacogen (that is, the failed spur of a triple junction found in a tectonic rifting area) of the East African Rift System, which extends from the Red Sea south to Lake Nyasa.

Major structural features and lakes of East African Rift System. White lines represent the generalised locations of the main bounding faults of the rift grabens. NE-SW trending Karoo grabens represent the Early Permian to Early Jurassic phase of rifting, such as the Luangwa Valley and Ruhuhu Graben.

The MER, at the northern end of the East African Rift System, accommodates 4–6 mm/yr, N°E oriented extension between the major Nubia and Somalia Plates (e.g., Saria et al., ). This rift is traditionally subdivided into three main sectors, the Southern, Central, and Northern MER (SMER, CMER, and NMER,Cited by: Under the Turkana region in the northern part of the rift, a greater amount of extension (35–40 km) has taken place and the crustal thickness is small (20 km), although the depth to the onset of melting under the northern part of the rift is, if anything, greater than under the southern part of the by: Figure 5: Map of the East Africa Rift system in green, showing the main fault patterns and ages of rift initiation.

Older basins are shown in orange. (Source: GEO International) Figure 6: Earth quake occurrences and magnitudes - (Source: GEO International/USGS) Figure 7: Holocene volcanism along the EARS.

The West and Central African rift systems: Foreword J.D. Fairhead many to be typical of the type of structures asso-ciated with the initial fragmentation of conti-nents. The role and relation between uplift, mag- Central African Rift System: a model of continental dis. East African Rift System - Primary Site (Replaced ; revised Decem ) Overview of the East African Rift System The EARS exhibits a wide variety of rift processes and characteristics, making it an ideal target for GeoPRISMS goals.

Aspects of all of the four key rift initiation and evolution (RIE) questions. 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 Edition: 1. Lithospheric structure of the West and Central African Rift System from regional three-dimensional gravity modelling Article (PDF Available) in South African Journal of Geology (3) The Ethiopian rift valley: geography and morphology.

The Ethiopian sector of the East African Rift system extends for more than km in a NE-SW to N-S direction from the Afar depression, at Red Sea-Gulf of Aden junction, southwards to the Turkana southern boundary may be traced at latitude ~5°N, south of the area where the rift is divided into two branches (Chamo basin to.

The Benue Trough is a major geological structure underlying a large part of Nigeria and extending about 1, km northeast from the Bight of Benin to Lake is part of the broader West and Central African Rift System.

a continent scale rift system that reaches from the Dead Sea to Mozambique. This lead to the popularization of the term “Afro-Arabian rift system” by geologists mapping its dif-ferent segments (Baker ; Khan ; Kazmin ). It was suggested that the Red Sea, and similarly the Gulf of Aden, were oceanic rifts at divergent plate File Size: 3MB.

The East African Rift System comprises a series of individual graben (rift valleys) that link-up to form the Western and Eas-tern Branch. The localities of Figs 2, 3, 4 and 5 are shown. (b) Tectonic overview map of southeast Africa showing schematically various mobile belts on which the East African Rift has been superimposed.

The third arm of the Afar triple junction is the East African rift system. This extends through Ethiopia and Kenya and branches round the Tanzanian Craton before dying out in Mozambique Figure 7. The northernmost part of the East African rift system is the Main Ethiopian Rift which opens out into the Afar Depression.

s no published maps of the Kenya Rift system during that period showed the existence of the Lokichar Fault. Yet this fault is possibly the largest fault in the Kenya Rift and Introduction to the East African Rift System 3 Figure 2.

Distribution of topographic domes with rela-tion to rift structure in East Africa (after Ebinger et al. The Mesozoic West and Central African Rift System: Qualitative Evaluation* James D. Fairhead1, 2 Search and Discovery Article # () Posted Ap *Adapted from oral presentation at AAPG International Conference and Exhibition, Cape Town, South Africa, October1GETECH, Leeds, United Kingdom.

generated the structures of the Red Sea, Gulf of Aden and East African Rift System (Fig. lc; Rosendahl et aI.,this volume).

These three periods of rifting and breakup of Gondwana illustrate an intimate relationship be-tween the plate tectonic evolution of the oceanic basins and continental tectonics, with a major.

East African Rift System which comprises a se- ries of rift zones which extend over a distance of approximately km from the Afar triple junc- tion at the Red Sea-Gulf of Aden intersection to the Zambesi River in southern Africa.

This rift system bifurcates around the Archean Nyanza. The Great Rift Valley is a series of contiguous geographic trenches, approximately 6, kilometres (3, mi) in total length, that runs from the Beqaa Valley in Lebanon which is in Asia to Mozambique in Southeast Africa.

While the name continues in some usages, it is rarely used in geology as it is considered an imprecise merging of separate though related rift and fault systems. The East African Rift System (EARS) started in Late Oligocene to Early Miocene time and gradually propagated southwards from the Afar Depression, beginning in the Middle Miocene.

The hot, low-density mantle material of the Afar Plume heated the overlying lithosphere, causing thinning, regional doming, and the earliest basaltic volcanism in Cited by: 5.

The offshore East African Rift System: Structural framework at the toe of a juvenile rift Dieter Franke1, Wilfried Jokat2, Stefan Ladage1, Harald Stollhofen3, Jennifer Klimke1, Ruediger Lutz1, Estevão Stefane Mahanjane4, Axel Ehrhardt1, and Bernd Schreckenberger1 1Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover, Germany, 2Alfred-Wegener-Institut, Helmholtz-ZentrumCited by: The results are presented in seismic hazard maps in terms of peak ground acceleration (PGA) for the mean and the 85th percentile.

The distribution of PGA values indicate relatively high hazard along the East African Rift system. In the northern segments of the rift system, they exceed gals for 10% probability of exceedence in 50 years. Transfer Zones and Hydrocarbon Accumulation in the Albertine Graben of the East African Rift System* In the Albertine Graben major structures have been formed in transfer zones along major faults.

Some of these structures have been drilled and found to have significant amounts of hydrocarbons. Recently published review articles from Journal of African Earth Sciences Review Articles. current in determining mantle electrical-depth conductivity structure – A review.

February History of the development of the East African Rift System: A series of interpreted maps through time. January Find local businesses, view maps and get driving directions in Google Maps.

When you have eliminated the JavaScript, whatever remains must be an empty page. Enable JavaScript to see Google Maps. South of the Red Sea Rift lies the massive, complex East African Rift.

This system of rift valleys is usually what people think of as the "Great Rift Valley." Throughout the East African Rift, the African plate is splitting in two.

The Nubian plate carries most of the continent, while the smaller Somali plate carries Horn of Size: KB. The East African Rift System is composed of two main segments: the eastern branch that passes through Ethiopia and Kenya, and a western branch that forms a.

The structural pattern of the Afro-AIrabian rift system suggests the influence of transcurrent faulting in the development of the main branches of the system, particularly along the Dead Sea rift, the Gulf of Suez and Red Sea, and the eastern rift of Africa.

Geophysical evidence indicates that the Red Sea and Gulf of Aden formed as a result of. The Great Rift Valley provides evidence of a split in the African Plate, dividing it into two smaller tectonic plates: the Somalian Plate and the Nubian Plate.

The Great Rift Valley in East Africa is divided into the Western Rift and the Eastern Rift. The Western Rift runs along the border with the Congo. “The Lake Pdf major discovery is also a major indicator,” he says. “But one [problem] with the East African Rift is the presence of abundant volcanism in the basins, particularly in the Kenya Rift.” Moreover, surveys are limited by the largely unknown geology of EARS; it is still relatively understudied.Episode 2: Along the African Rift Unit Overview Activity – The Download pdf Triangle: Where Volcanoes, Early Humans and a Young Ocean Meet Activity – Birth of the Nile and the Rise of a Stone Culture in Egypt Activity – The Dead Sea Rift and Clues to Ancient Earthquakes Episode 3: The Pacific Rim: Americas   Corti G () Continental rift evolution: from rift initiation to incipient ebook in the ebook Ethiopian Rift, East Africa.

Earth Sci Rev –53 Google Scholar Coulié E, Quideleur X, Gillot PY, Courtillot V, Lefevre JC, Chiesa S () Comparative K–Ar and Ar/Ar dating of Ethiopian and Yemenite Oligocene volcanism: implications for Cited by: