All Title Author
Keywords Abstract

Publish in OALib Journal
ISSN: 2333-9721
APC: Only $99


Relative Articles

Mantle lithosphere control of crustal tectonics and magmatism of the western Oh e (Eger) Rift

Structural Controls on the Geochemistry and Output of the Wells in the Olkaria Geothermal Field of the Kenyan Rift Valley

Geochronology, geochemistry and geological significance of Late Triassic magmatism in Qingchengzi orefield, Liaoning

Petrology and Geochemistry of lavas from Sal Island: Implications for the variability of the Cape Verde magmatism

A reappraaisal of the geology, geochemistry, structures and tectonics of the Mozambique belt in Kenya, east of the rift system

Jurassic to Early Cretaceous subduction-related magmatism in the Coastal Cordillera of northern Chile (18°30'-24°S): geochemistry and petrogenesis

Geochemistry and Geochronology of Peraluminous High-K Granitic Leucosomes of Yaoundé Series (Cameroon): Evidence for a Unique Pan-African Magmatism and Melting Event in North Equatorial Fold Belt

Petrology and geochemistry of Hulanhoboke volcano in Baikal rift, Russia

Evaluating earthquake disaster risk management in schools in Rungwe Volcanic Province in Tanzania

Petrografía y geoquímica del magmatIsmo cretácico superior-eoceno en el área de PichaIhue, provincia de Neuquén Petrography and geochemistry of Upper Cretaceous-Eocene magmatism in the Pichaihue area, Neuquén Province


Trace element and Sr-Nd-Pb isotope geochemistry of Rungwe Volcanic Province, Tanzania: implications for a Superplume source for East Africa Rift magmatism

DOI: 10.3389/feart.2014.00021

Keywords: Rungwe volcanic province, East African Rift system, African Superplume, high 3He/4He lavas, carbonatite metasomatism, Afar plume, Main Ethiopian Rift, Kenyan Rift

Full-Text   Cite this paper   Add to My Lib


The recently-discovered high, plume-like 3He/4He ratios at Rungwe Volcanic Province (RVP) in southern Tanzania, similar to those at the Main Ethiopian Rift in Ethiopia, strongly suggest that magmatism associated with continental rifting along the entire East African Rift System (EARS) has a deep mantle contribution (Hilton et al., 2011). New trace element and Sr-Nd-Pb isotopic data for high 3He/4He lavas and tephras from RVP can be explained by binary mixing relationships involving Early Proterozoic (±Archaean) lithospheric mantle, present beneath the southern EARS, and a volatile-rich carbonatitic plume with a limited range of compositions and best represented by recent Nyiragongo lavas from the Virunga Volcanic Province also in the Western Rift. Other lavas from the Western Rift and from the southern Kenyan Rift can also be explained through mixing between the same endmember components. In contrast, lavas from the northern Kenyan and Main Ethiopian rifts can be explained through variable mixing between the same mantle plume material and Middle to Late Proterozoic lithospheric mantle, present beneath the northern EARS. Thus, we propose that the bulk of EARS magmatism is sourced from mixing among three endmember sources: Early Proterozoic (±Archaean) lithospheric mantle, Middle to Late Proterozoic lithospheric mantle and a volatile-rich carbonatitic plume with a limited range of compositions. We propose further that the African Superplume, a large, seismically anomalous feature originating in the lower mantle beneath southern Africa, influences magmatism throughout eastern Africa with magmatism at RVP and the Main Ethiopian Rift representing two different heads of a single mantle plume source. This is consistent with a single mantle plume origin of the coupled He-Ne isotopic signatures of mantle-derived xenoliths and/or lavas from all segments of the EARS (Halldórsson et al., 2014).


comments powered by Disqus