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The EAST AFRICAN RIFT (EAR) is an active continental rift zone in East Africa . The EAR began developing around the onset of the Miocene , 22–25 million years ago. In the past, it was considered to be part of a larger Great Rift Valley that extended north to Asia Minor .

The rift is a narrow zone that is a developing divergent tectonic plate boundary , in which the African Plate is in the process of splitting into two tectonic plates , called the Somali Plate and the Nubian Plate , at a rate of 6–7 mm annually. As extension continues, lithospheric rupture will occur within 10 million years, the Somalian plate will break off, and a new ocean basin will form.

CONTENTS

* 1 Extent * 2 Competing theories on geologic evolution * 3 Geologic evolution * 4 Petrology * 5 Volcanism and seismicity * 6 Discoveries in human evolution * 7 See also * 8 References

EXTENT

A series of distinct rift basins, the East African Rift System extends over thousands of kilometers. The EAR consists of two main branches. The Eastern Rift Valley (also known as Gregory Rift ) includes the Main Ethiopian Rift , running eastward from the Afar Triple Junction , which continues south as the Kenyan Rift Valley. The Western Rift Valley includes the Albertine Rift , and farther south, the valley of Lake Malawi . To the north of the Afar Triple Junction, the rift follows one of two paths: west to the Red Sea Rift or east to the Aden Ridge in the Gulf of Aden .

The EAR runs from the Afar Triple Junction in the Afar Triangle of Ethiopia through eastern Africa, terminating in Mozambique. The EAR transects through Ethiopia , Kenya , Uganda , Rwanda , Burundi , Zambia , Tanzania , Malawi and Mozambique . It also runs offshore of the coast of Mozambique along the Kerimba and Lacerda grabens , which are joined by the Davie Ridge, a 2200 km-long relic fracture zone that cuts across the West Somali basin, straddling the boundary between Tanzania and Mozambique. The Davie Ridge ranges between 30–120 km wide, with a west facing scarp (east-plunging arch) along the southern half of its length that rises up to 2300 m above the sea floor. Its movement is concurrent with the EAR.

COMPETING THEORIES ON GEOLOGIC EVOLUTION

Over time, many theories have tried to clarify the evolution of the East African Rift. In 1972 it was proposed that the EAR was not caused by tectonic activity, but rather by differences in crustal density. Others proposed an African superplume causing mantle deformation. However, the varying geochemical signatures of a suite of Ethiopian lavas suggest multiple plume sources: at least one of deep mantle origin, and one from within the subcontinental lithosphere. Additionally, the subject of deep-rooted mantle plumes is still a matter of controversy, and therefore cannot be confirmed.

The most recent and accepted view is the theory put forth in 2009: that magmatism and plate tectonics have a feedback with one another, controlled by oblique rifting conditions. At that time it was suggested that lithospheric thinning generated volcanic activity, further increasing the magmatic processes at play such as intrusions and numerous small plumes. These processes further thin the lithosphere in saturated areas, forcing the thinning lithosphere to behave like a mid-ocean ridge .

GEOLOGIC EVOLUTION

Prior to rifting, enormous continental flood basalts erupted on the surface and uplift of the Ethiopian , Somalian, and East African plateaus occurred. The first stage of rifting of the EAR is characterized by rift localization and magmatism along the entire rift zone. Periods of extension alternated with times of relative inactivity. There was also the reactivation of a pre-Cambrian weakness in the crust, a suture zone of multiple cratons , displacement along large boundary faults, and the development of deep asymmetric basins. The second stage of rifting is characterized by the deactivation of large boundary faults, the development of internal fault segments, and the concentration of magmatic activity towards the rifts.

Today, the narrow rift segments of the East African Rift system form zones of localized strain. These rifts are the result of the actions of numerous normal faults which are typical of all tectonic rift zones. As aforementioned, voluminous magmatism and continental flood basalts characterize some of the rift segments, while other segments, such as the Western branch, have only very small volumes of volcanic rock.

PETROLOGY

An artificial rendering of the Albertine Rift , which forms the western branch of the East African Rift. Visible features include (from background to foreground): Lake Albert , the Rwenzori Mountains , Lake Edward , the volcanic Virunga Mountains , Lake Kivu , and the northern part of Lake Tanganyika

The African continental crust is generally cool and strong. Many cratons are found throughout the EAR, such as the Tanzania and Kaapvaal cratons . The cratons are thick, and have survived for billions of years with little tectonic activity. They are characterized by greenstone belts , tonalites , and other high-grade metamorphic lithologies. The cratons are of significant importance in terms of mineral resources , with major deposits of gold, antimony, iron, chromium and nickel.

A large volume of continental flood basalts erupted during the Oligocene , with the majority of the volcanism coinciding with the opening of the Red Sea and the Gulf of Aden approximately 30 Ma. The composition of the volcanics are a continuum of ultra-alkaline to tholeiitic and felsic rocks. It has been suggested that the diversity of the compositions could be partially explained by different mantle source regions. The EAR also cuts through old sedimentary rocks deposited in ancient basins.

VOLCANISM AND SEISMICITY

The East African Rift Zone includes a number of active as well as dormant volcanoes, among them: Mount Kilimanjaro , Mount Kenya , Mount Longonot , Menengai Crater, Mount Karisimbi , Mount Nyiragongo , Mount Meru and Mount Elgon , as well as the Crater Highlands in Tanzania. Although most of these mountains lie outside of the rift valley, the EAR created them.

Active volcanos include Erta Ale , DallaFilla, and Ol Doinyo Lengai , the former of which is a continuously active basaltic shield volcano in the Afar Region of northeastern Ethiopia. When DallaFilla erupted in 2008 it was the largest volcanic eruption in Ethiopia in recorded history. The Ol Doinyo Lengai volcano is currently the only active natrocarbonatite volcano in the world. The magma contains almost no silica, making the flow viscosity extremely low. “Its lava fountains crystallize in midair then shatter like glass” according to the National Geographic. Approximately 50 volcanic structures in Ethiopia alone have documented activity since the onset of the Holocene .

The EAR is the largest seismically active rift system on Earth today. The majority of earthquakes occur near the Afar Depression, with the largest earthquakes typically occurring along or near major border faults. Seismic events in the past century are estimated to have reached a maximum moment magnitude of 7.0. The seismicity trends parallel to the rift system, with a shallow focal depth of 12–15 km beneath the rift axis. Further away from the rift axis, focal depths can reach depths of over 30 km. Focal mechanism solutions strike NE and frequently demonstrate normal dip-slip faults, although left-lateral motion is also observed.

DISCOVERIES IN HUMAN EVOLUTION

Main articles: Human evolution and Timeline of human evolution

The Rift Valley in East Africa has been a rich source of hominid fossils that allow the study of human evolution. The rapidly eroding highlands quickly filled the valley with sediments, creating a favorable environment for the preservation of remains. The bones of several hominid ancestors of modern humans have been found here, including those of "Lucy ", a partial australopithecine skeleton discovered by anthropologist Donald Johanson dating back over 3 million years. Richard and Mary Leakey have done significant work in this region also. More recently, two other hominid ancestors have been discovered here: a 10-million-year-old ape called _ Chororapithecus abyssinicus _, found in the Afar rift in eastern Ethiopia, and _ Nakalipithecus nakayamai _, which is also 10 million years old.

SEE ALSO

* Baikal Rift Zone * Lake Victoria * Northern Cordilleran Volcanic Province * West Antarctic Rift * West and Central African Rift System

REFERENCES

* ^ Ebinger, C.J. (2005). "Continental break-up: the East African perspective.". _Astron. Geophys_. 46: 216–21. * ^ Fernandes, R.M.S.; Ambrosius, B.A.C.; Noomen, R.; Bastos, L.; Combrinck, L.; Miranda, J.M.; Spakman, W. (2004). "Angular velocities of Nubia and Somalia from continuous GPS data: implications on present-day relative kinematics.". _Earth Planet. Sci. Lett_. 222: 197–208. Bibcode :2004E&PSL.222..197F. doi :10.1016/j.epsl.2004.02.008 . * ^ _A_ _B_ _C_ _D_ _E_ Corti, G. "The Ethiopian Rift Valley". National Research Council of Italy, Institute of Geosciences and Earth Resources. Retrieved March 19, 2014. * ^ _A_ _B_ _C_ Moungenot, D.; Recq, M.; Virlogeux, P.; Lepvrier, C. (1986). "Seaward extension of the East African Rift". _Letters to Nature_. * ^ Chorowicz, Jean (2005). "The East African rift system". _Journal of African Earth Sciences_. 43 (1): 379–410. Bibcode :2005JAfES..43..379C. doi :10.1016/j.jafrearsci.2005.07.019 . * ^ Mascle, J; Moungenot, D.; Blarez, E.; Marinho, M.; Virlogeux, P. "African transform continental margins: examples from Guinea, the Ivory Coast and Mozambique". _Geological journal_. 2. 22: 537–561. doi :10.1002/gj.3350220632 . * ^ Scrutton, R.A. (1978). "David fracture zone and the movement of Madagascar". _Earth and Planetary Science Letters_. 39 (1): 84–88. Bibcode :1978E&PSL..39...84S. doi :10.1016/0012-821x(78)90143-7 . * ^ Logatchev, N.A.; Beloussov, V.V.; Milanovsky, E.E. (1972). "East African rift development". _Tectonophysics_. 15 (1): 71–81. Bibcode :1972Tectp..15...71L. doi :10.1016/0040-1951(72)90053-4 . * ^ _A_ _B_ Ebinger, C.J.; Sleep, N.H. (1998). "Cenozoic magmatism throughout east Africa resulting from impact of a single plume". _Nature_. 395: 788–791. Bibcode :1998Natur.395..788E. doi :10.1038/27417 . * ^ _A_ _B_ Corti, G (2009). "Continental rift evolution: from rift initiation to incipient break-up in the Main Ethiopian Rift, East Africa". _Earth-Science Reviews_. 96 (1): 1–53. Bibcode :2009ESRv...96....1C. doi :10.1016/j.earscirev.2009.06.005 . * ^ _A_ _B_ _C_ _D_ _E_ Kearey, P; Klepeis, K.A.; Vine, F.J. (2009). _Global Tectonics_. John Wiley & Sons. * ^ Taylor, C.D.; Schulz, K.J.; Doebrich, J.L.; Orris, G.J.; Denning, P.D.; Kirschbaum, M.J. "Geology and Nonfuel Mineral Deposits of Africa and Middle East". US Department of the Interior, US Geological Survey. * ^ _A_ _B_ Saemundsson, K (2009). "East African Rift System-An Overview". _Reykjavik: United Nations University, Iceland GeoSurvey_. * ^ Siebert, L.; Simkin, T.; Kimberly, P. (2010). _Volcanoes of the World_. University of California Press. * ^ "Great Rift Valley Ecosystem – UNESCO World Heritage Centre". UNESCO. Retrieved March 14, 2008. * ^ Gibbons, A. (2002). "Profile: Michel Brunet: One Scientist's Quest for the Origin of Our Species". _Science_. 298 (5599): 1708–1711. PMID 12459568 . doi :10.1126/science.298.5599.1708 . * ^ Seward, Liz (2007). "Fossils belong to new great ape". _BBC News London_. Retrieved March 14, 2008.

* v * t * e

Major African geological formations

PLATES

* African Plate * Somali Plate * Madagascar Plate * Seychelles Plate

CRATONS AND SHIELDS

* Arabian-Nubian Shield * Congo Craton * Kaapvaal Craton * Kalahari Craton * Saharan Metacraton * Tanzania Craton * Tuareg Shield * West African Craton * Zimbabwe Craton

SHEAR ZONES

* Aswa Dislocation * Broodkop Shear Zone * Central African Shear Zone * Chuan Shear Zones * Foumban Shear Zone * Mwembeshi Shear Zone * Todi Shear Zone * Western Meseta Shear Zone

OROGENS

* Alpide Orogen * Cape Fold Belt * Damara Orogen * East African Orogen * Eburnean Orogen * Gondwanide Orogen * Kuunga Orogen * Mauritanide Belt * Pan-African orogens * Terra Australis Orogen

RIFTS

* Afar Triangle * Anza trough * Bahr el Arab rift * Benue Trough * Blue Nile rift * East African Rift * Gulf of Suez Rift * Lamu Embayment * Melut Basin * Muglad Basin * Red Sea Rift * Sangha Aulacogen * Atbara rift * White Nile rift

SEDIMENTARY BASINS

* Angola Basin * Aoukar * Blue Nile Basin * Chad Basin * Congo Basin * Douala Basin * El Djouf * Foreland Karoo Basin * Gabon Basin * Iullemmeden Basin * Kufra Basin * Murzuq Basin * Niger Delta Basin * Ogaden Basin * Orange River basin * Ouled Abdoun Basin * Owambo Basin * Reggane Basin * Rio del Rey Basin * Sirte Basin * Somali Coastal Basin * Taoudeni basin * Tanzania Coastal Basin * Tindouf Basin * Turkana Basin

MOUNTAIN RANGES

* Aïr Mountains * Atlas Mountains * Aurès Mountains * Bambouk Mountains * Blue Mountains * Cameroon line * Central Pangean Mountains * Chaillu Mountains * Drakensberg * Ethiopian Highlands * East African mountains * Great Escarpment * Great Karas Mountains * Guinée forestière * Imatong Mountains * Jebel Uweinat * Loma Mountains * Mandara Mountains * Marrah Mountains * Mitumba Mountains * Nuba Mountains * Rif Mountains * Rwenzori Mountains * Sankwala Mountains * Serra da Leba * Serra da Chela * Teffedest Mountains * Tibesti Mountains

AUTHORITY CONTROL

* WorldCat Identities * VIAF : 246083336 * GND : 4043997-5

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