Danakil Depression

Coordinates: 14°14′30″N 40°18′00″E / 14.2417°N 40.3°E / 14.2417; 40.3
Source: Wikipedia, the free encyclopedia.

Erta Ale erupting within the Danakil Depression
Mount Ayalu
, the westernmost and older of two volcanoes at the southern end of the Danakil Depression

The Danakil Depression is the northern part of the

depression that has resulted from the divergence of three tectonic plates in the Horn of Africa
. It is the third lowest lying location on the continent of Africa.

Geology

The Danakil Depression lies at the

tectonic plates and has a complex geological history. It has developed as a result of Africa and Asia moving apart, causing rifting and volcanic activity. Erosion, inundation by the sea, the rising and falling of the ground have all played their part in the formation of this depression. Sedimentary rocks such as sandstone and limestone are unconformably overlain by basalt which resulted from extensive lava flows.[3]

IUGS geological heritage site

In respect of it demonstrating 'the ongoing birth of an ocean witnessed through tectonics and volcanism in an extreme evaporite arid environment', the International Union of Geological Sciences (IUGS) included 'The Danakil Rift depression and its volcanism' in its assemblage of 100 'geological heritage sites' around the world in a listing published in October 2022. The organisation defines an IUGS Geological Heritage Site as 'a key place with geological elements and/or processes of international scientific relevance, used as a reference, and/or with a substantial contribution to the development of geological sciences through history.'[4]

Location

The Danakil

Depression is a plain approximately 200 by 50 km (124 by 31 mi), lying in the north of the Afar Region of Ethiopia, near the border with Eritrea. It is about 125 m (410 ft) below sea level and is bordered to the west by the Ethiopian Plateau and to the east by the Danakil Alps, beyond which is the Red Sea.[5]

The area is often referred to as the cradle of

palaeontologists
to propose that this area is where the human species first evolved.

Features

microbes.[2]

The Danakil Depression is the hottest place on Earth in terms of year-round average temperatures. It is also one of the lowest places on the planet at 100 metres (330 ft) below sea level,[7] and without rain for most of the year. Here, the Awash River dries up in a chain of salt lakes such as Lake Afrera, never reaching the Indian Ocean.[8]

lifeforms, including extreme forms of archaea microorganisms, were not found to exist in the very hot, acidic and salty conditions present in some parts of the Danakil Depression.[9][10]

Hot springs

Among the geological points of interest to tourists are the

hydrothermal system of Dallol[11] and the Yellow Lake.[12]

Further information: Gaet'ale Pond

Gaet'ale Pond is a small hypersaline lake located over a tectonic hot spring in the Danakil Depression (Afar, Ethiopia). With a salinity of 43%, Gaet'ale Pond is the saltiest water body on Earth.[13] The pond was created in January 2005 following an earthquake, according to residents of the Ahmed'ela village, which reactivated the hot spring.[14]

See also

References

  1. doi:10.1016/j.jafrearsci.2005.03.003
    .
  2. ^ a b c d Yee, Amy (30 January 2017). "Gazing Into Danakil Depression's Mirror, and Seeing Mars Stare Back". The New York Times. Retrieved 31 January 2017.
  3. ISBN 978-3-540-76373-4
    .
  4. ^ "The First 100 IUGS Geological Heritage Sites" (PDF). IUGS International Commission on Geoheritage. IUGS. Retrieved 13 November 2022.
  5. ISBN 978-0-08-086964-3
    .
  6. ISBN 9780684810232
    .
  7. ^ a b c "Hydrothermal Systems Show Spectrum of Extreme Life on Earth". Europlanet. Astrobiology Web. 26 April 2016. Retrieved 1 May 2016.
  8. ^ "Africa's Danakil Desert – National Geographic Magazine". Ngm.nationalgeographic.com. Archived from the original on 16 April 2010. Retrieved 10 December 2013.
  9. PMID 31666740
    .
  10. ^ Andrews, Robin George (1 November 2019). "They Didn't Find Life in a Hopeless Place - In some of the world's wettest, most acidic bodies of superheated water, even the most extreme forms of archaea couldn't survive". The New York Times. Retrieved 4 November 2019.
  11. PMID 30801049
    .
  12. ^ "Yellow lake is located in the Danakil Depression". Independent Travellers. independent-travellers.com. Retrieved 13 June 2017.
  13. S2CID 132715553
    .
  14. doi:10.1186/s13617-015-0042-x
    .

External links
Wikivoyage has a travel guide for Danakil Depression.

14°14′30″N 40°18′00″E / 14.2417°N 40.3°E / 14.2417; 40.3

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