Ethiopia-Yemen Continental Flood Basalts

Shibam-Kawkaban ignimbrite, Yemen, part of the Ethiopia-Yemen CFB

The Ethiopia-Yemen Continental Flood Basalts were erupted during the Oligocene. They cover an area of about 600,000 km2 in Yemen and Ethiopia, with an estimated volume of greater than 350,000 km3.[1] They are associated with the Afar Plume and the initiation of rifting in the southern Red Sea and Gulf of Aden.[2]

Composition

The lavas of the Ethopia-Yemen CFB show systematic variations in composition both vertically and laterally. Most of the lavas are basalts, but those closest to the Afar Triangle being very high Titanium transitional basalts and picrites, passing outwards into high-Ti tholeiitic basalts and finally into low-Ti tholeiitic basalts. The sequence is also an example of bimodal volcanism and the uppermost part typically contains significant amounts of rhyolitic lavas.[2]

References

  1. ↑ Ukstins I.A., Renne P.R., Wolfenden E., Baker J., Ayalew D. & Menzies M. (2002). "Matching conjugate volcanic rifted margins: 40Ar/39Ar chrono-stratigraphy of pre- and syn-rift bimodal flood volcanism in Ethiopia and Yemen" (PDF). Earth and Planetary Science Letters 198 (3-4): 289–386. doi:10.1016/S0012-821X(02)00525-3.
  2. 1 2 Natali C., Beccaluva L., Bianchini G. & Siena F. (2011). "Rhyolites associated to Ethiopian CFB: Clues for initial rifting at the Afar plume axis". Earth and Planetary Science Letters 312 (1-2): 59–68. doi:10.1016/j.epsl.2011.09.059.
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