2009
DOI: 10.4314/mejs.v1i1.46039
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Compositional Differences between Felsic Volcanic rocks from the Margin and Center of the Northern Main Ethiopian Rift

Abstract: Pliocene felsic rift margin and Quaternary rift center volcanic rocks from the northern Main Ethiopian Rift (MER) exhibit contrasts in major and trace element contents and Sr-Nd isotopic ratios. Quaternary rift center felsic volcanic rocks are mainly peralkaline trachytes and rhyolites, whereas Pliocene felsic rift margin volcanic rocks are represented by benmoreites, weakly peralkaline trachytes and rare rhyolites.Most of the felsic rift margin volcanic rocks have greater Al 2 O 3 , K 2 O, Nb, Zr, Rb, and Sr,… Show more

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Cited by 5 publications
(4 citation statements)
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“…The associated minerals, quartz, montmorillonite, albite and hematite reported in Saudi Arabia and Nigeria clays is similar to the clays of the study area but the relatively high content of the quartz and calcite in some clay samples affects the kaolinite contents and makes it impure (Tables 1 & 3 (Mohsen and El-maghraby, 2010;Aref and Rong, 2009;Ehinola et al, 2009) (Table 3). The in clays are similar to that of the basaltic rocks and felsic rocks in the region (Kabeto et al, 2009;Kabeto, 2010). Plots shown in figure 7, further suggest two distinct groups in the Ashenge clays, Fig.…”
Section: Mineralogy and Chemistry Of The Clays And Associated Lake Sesupporting
confidence: 70%
See 1 more Smart Citation
“…The associated minerals, quartz, montmorillonite, albite and hematite reported in Saudi Arabia and Nigeria clays is similar to the clays of the study area but the relatively high content of the quartz and calcite in some clay samples affects the kaolinite contents and makes it impure (Tables 1 & 3 (Mohsen and El-maghraby, 2010;Aref and Rong, 2009;Ehinola et al, 2009) (Table 3). The in clays are similar to that of the basaltic rocks and felsic rocks in the region (Kabeto et al, 2009;Kabeto, 2010). Plots shown in figure 7, further suggest two distinct groups in the Ashenge clays, Fig.…”
Section: Mineralogy and Chemistry Of The Clays And Associated Lake Sesupporting
confidence: 70%
“…Figure 7. Plots of major elemental data of Ashenge clays compared with basalt, basanite and rhyolitic rocks in the area (Kabeto, 2010;Kabeto et al, 2009).…”
Section: Mineralogy and Chemistry Of The Clays And Associated Lake Sementioning
confidence: 99%
“…In comparison with the above classification, based on geochemistry, the Ethiopian flood basalts are also divided into low-Ti basalts (LT), high-Ti1 basalts (HT1), and high-Ti2 basalts (HT2) magma types (Pik et al 1998(Pik et al , 1999. Inter fingering with these flood basalt, mainly at upper stratigraphic levels, felsic lavas, and pyroclastic rocks of rhyolitic and trachytic compositions are dominated (Ayalew et al 1999;Kabeto et al 2009). The trachytes occur as plugs (steep-sided and conical hills) and domes lie within an E-W belt extending from the eastern margin of the Ethiopian plateau (Kabeto et al 2009).…”
Section: Regional Geologymentioning
confidence: 99%
“…Inter fingering with these flood basalt, mainly at upper stratigraphic levels, felsic lavas, and pyroclastic rocks of rhyolitic and trachytic compositions are dominated (Ayalew et al 1999; Kabeto et al 2009). The trachytes occur as plugs (steep-sided and conical hills) and domes lie within an E–W belt extending from the eastern margin of the Ethiopian plateau (Kabeto et al 2009). Because of the weathering and erosion effect, the felsic rocks tend to form clay deposits (Bedassa et al 2019).…”
Section: Regional Geologymentioning
confidence: 99%