Ashangi Basalts
| Ashangi Basalts | |
|---|---|
| Stratigraphic range: | |
Lake Hashenge | |
| Named by | William Thomas Blanford |
  Ashangi Basalts (Ethiopia) | |
The Ashangi Basalts are the earliest
phenocrysts that developed before the magma reached the earth surface. These basalts are weathered, partially eroded and have a sub-horizontal stratification, particularly at the lower part. This series was created during the first period of the flood basalt eruptions in north Ethiopia, in the Oligocene.[1][2][3]
Name and definition
The name was coined by geologist
Lake Hashenge in Tigray, which is surrounded by large outcrops of the formation. So far the nomenclature has not been proposed for recognition to the International Commission on Stratigraphy
.
Stratigraphic context
The formation covers Mesozoic sedimentary rocks, particularly Amba Aradam Formation and Adigrat Sandstone. In many places, on its upper side, deposits of intra-volcanic sedimentary rock occur.
Environment
These volcanic rocks formed through melting of
hexagonal shape (in plan view).[2]
Dogu’a Tembien (Ethiopia
) is located on the Ashangi Basalts, as can be seen from the typical building materials of houses and fencesLithology
The Ashangi Basalts are made of coarse-grained plagioclase minerals, surrounded by a matrix of fine-grained plagioclases and pyroxenes; some iron oxides are also present.[2]
Mashih
Geographical extent
The Ashangi formation occurs widely in
References
- ^ Justin-Visentin, E. (1974). "Petrografia, chimismo e petrogenesi dei corpi subvulcanici di Macallè (Tigrai Etiopia)". Memorie dell'Istituto di Geologia e Mineralogia, Universita di Padova. 31: 1–33.
- ^ ISBN 978-3-030-04954-6.
- ^ doi:10.1038/39853.
- ^ Blanford, W.T. (1870). Observations on the geology and zoology of Abyssinia, made during the progress of the British expedition to that country in 1867-68. London: Macmillan and Co.