Geochronology and geochemistry of the Essimingor volcano: Melting of metasomatized lithospheric mantle beneath the North Tanzanian Divergence zone (East African Rift)

Mana, Sara; Furman, Tanya; Carr, Michael J.; Mollel, Godwin F.; Mortlock, Richard A.; Feigenson, Mark D.; Turrin, B. D.; Swisher, Carl C.

doi:10.1016/j.lithos.2012.09.009

Cited by 48 publications

(47 citation statements)

References 85 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In this context, we focus on the Northern Tanzanian section of the eastern branch of the EARS, the so-called Gregory Rift. As already stated by Leakey (1979) and numerous other authors, Tanzania is well known for prehistoric specimens of early hominids found, for example, in Olduvai Gorge, at Lake Masek or at Laetoli ( Fig. 8.2).…”

Section: Introduction and Study Areasupporting

confidence: 56%

“…Most SAR systems are active remote sensing systems, which operate in the microwave electromagnetic spectrum. SAR systems transmit energy pulses and record the backscattered energy of objects (Lillesand et al 2004). The backscattered signal is influenced mainly by the physical properties of a surface.…”

Section: 4mentioning

confidence: 99%

“…Keller and colleagues collected Pleistocene faunal material and Middle Stone Age (MSA) lithics and published several stratigraphic sections (Keller et al 1975). Recent studies investigated the geology, paleontology, and archeology of the Lake Manyara Beds, e.g., Kaiser et al (1995Kaiser et al ( , 2010, Kaiser (2000), Ring et al (2005a), Frost et al (2012), Schwartz et al (2012), Mana et al (2012), and Giemsch (2015).…”

Section: Introduction and Study Areamentioning

confidence: 99%

See 2 more Smart Citations

Paleoenvironmental Research in the Semiarid Lake Manyara Area, Northern Tanzania: A Synopsis

Bachofer

Quénéhervé

Hertler

et al. 2017

Natural Science in Archaeology

View full text Add to dashboard Cite

The Lake Manyara area is the focus of several paleo-archeological investigations. The Manyara basin is located approximately 70 km east of Olduvai Gorge, where important paleoanthropological artifacts are traced back to Homo habilis. In the Manyara basin itself, two hominin-bearing sites (0.78-0.633 Ma) and plenty of vertebrate bones and teeth as well as stone artifacts from different periods were discovered, especially close to the Makuyuni River. Different methodological approaches with a main emphasis on remote sensing were utilized to contribute to the understanding of the paleo-landscape development. In order to investigate the morphotectonic evolution of the study area, lineaments were detected from Synthetic Aperture Radar satellite scenes. The complex lacustrine development of the Lake Manyara and its paleo-stages was investigated by delineating the extent of paleo-lake sediments (older than 0.633 Ma) with multispectral ASTER data. In addition, lake terraces and shorelines on different levels (up to 80 m above today's lake level) and an outlet to the neighboring Engaruka basin were detected by analyzing the backscattered intensity of TerraSAR-X data. The distribution of topsoils, identified from multisensory remote sensing datasets, indicates soil formation as well as erosional and depositional processes. The fossils and artifacts were then

show abstract

Section: Introduction and Study Areasupporting

confidence: 56%

Section: 4mentioning

confidence: 99%

Section: Introduction and Study Areamentioning

confidence: 99%

See 1 more Smart Citation

Paleoenvironmental Research in the Semiarid Lake Manyara Area, Northern Tanzania: A Synopsis

Bachofer

Quénéhervé

Hertler

et al. 2017

Natural Science in Archaeology

View full text Add to dashboard Cite

show abstract

“…Rifting initiated at ca. 25 My in the Turkana region, but faulting and magmatism in the Magadi-Natron-Manyara area initiated less than 7 My ago (Baker 1986;Mana et al 2012), where they appear to have been co-eval Le Gall et al 2008). Rifting initiated in Pan-African lithospheric domains which imparted a strong N-S fabric to crustal rocks (Smith & Mosley 1993;Le Gall et al 2008).…”

Section: G E O L O G I C a L S E T T I N Gmentioning

confidence: 99%

Lithospheric low-velocity zones associated with a magmatic segment of the Tanzanian Rift, East Africa

Plasman¹,

Tiberi

Ebinger

et al. 2017

Geophysical Journal International

View full text Add to dashboard Cite

“…In the East branch, volcanism began at 30 Ma in the North Kenya, at 15 Ma in Central Kenya and at 6 Ma in the Northern Tanzania (Essimingor volcano; Mana et al 2012Mana et al , 2015. The axial valley is narrow (50 km) in the central Kenyan rift and expands over 200 km to the South, forming the NTD, with many volcanic complexes (e.g.…”

Section: Geological Settingmentioning

confidence: 99%

Nephelinite lavas at early stage of rift initiation (Hanang volcano, North Tanzanian Divergence)

Baudouin

Parat

Denis

et al. 2016

Contrib Mineral Petrol

View full text Add to dashboard Cite

International audienceNorth Tanzanian Divergence is the first stage of continental break-up of East African Rift (<6 Ma) and is one of the most concentrated areas of carbonatite magmatism on Earth, with singular Oldoinyo Lengai and Kerimasi volcanoes. Hanang volcano is the southernmost volcano in the North Tanzanian Divergence and the earliest stage of rift initiation. Hanang volcano erupted silica-undersaturated alkaline lavas with zoned clinopyroxene, nepheline, andradite-schorlomite, titanite, apatite, and pyrrhotite. Lavas are low MgO-nephelinite with low Mg# and high silica content (Mg# = 22.4–35.2, SiO2 = 44.2–46.7 wt%, respectively), high incompatible element concentrations (e.g. REE, Ba, Sr) and display Nb–Ta fractionation (Nb/Ta = 36–61). Major elements of whole rock are consistent with magmatic differentiation by fractional crystallization from a parental melt with melilititic composition. Although fractional crystallization occurred at 9–12 km and can be considered as an important process leading to nephelinite magma, the complex zonation of cpx (e.g. abrupt change of Mg#, Nb/Ta, and H2O) and trace element patterns of nephelinites recorded magmatic differentiation involving open system with carbonate–silicate immiscibility and primary melilititic melt replenishment. The low water content of clinopyroxene (3–25 ppm wt. H2O) indicates that at least 0.3 wt% H2O was present at depth during carbonate-rich nephelinite crystallization at 340–640 MPa and 1050–1100 °C. Mg-poor nephelinites from Hanang represent an early stage of the evolution path towards carbonatitic magmatism as observed in Oldoinyo Lengai. Paragenesis and geochemistry of Hanang nephelinites require the presence of CO2-rich melilititic liquid in the southern part of North Tanzanian Divergence and carbonate-rich melt percolations after deep partial melting of CO2-rich oxidized mantle source

show abstract

Geochronology and geochemistry of the Essimingor volcano: Melting of metasomatized lithospheric mantle beneath the North Tanzanian Divergence zone (East African Rift)

Cited by 48 publications

References 85 publications

Paleoenvironmental Research in the Semiarid Lake Manyara Area, Northern Tanzania: A Synopsis

Paleoenvironmental Research in the Semiarid Lake Manyara Area, Northern Tanzania: A Synopsis

Lithospheric low-velocity zones associated with a magmatic segment of the Tanzanian Rift, East Africa

Nephelinite lavas at early stage of rift initiation (Hanang volcano, North Tanzanian Divergence)

Contact Info

Product

Resources

About