|Barberton greenstone belt|
|Elevation||1,800 m (5,900 ft)|
|Countries||South Africa and Swaziland|
|Range coordinates||Coordinates: |
|Official name||Barberton Makhonjwa Mountains|
|State Party||South Africa|
The Makhonjwa Mountains, also known as the Barberton Greenstone Belt or Barberton Mountain Land, is a range of small mountains and hills that covers an area of 120 by 60 kilometres (75 by 37 mi), about 80% in Mpumalanga, a province of South Africa, and the remainder in neighbouring Eswatini.
The area ranges in altitude from 600 to 1,800 metres (2,000 to 5,900 ft) above mean sea level. It has a number of rocky hills, with moist grassy uplands and forested valleys. The region lies within the Barberton centre of endemism. The mean annual precipitation is 600–1,150 millimetres (24–45 in), with wet summers and dry winters.
The mountains lie on the eastern edge of the Kaapvaal Craton. The range is best known for having some of the oldest exposed rocks on Earth, estimated to be between 3.2 and 3.6 billion years (Ga) old, dating from the Paleoarchean. The mountain range's extreme age and exceptional preservation have yielded some of the oldest undisputed signs of life on Earth and provide insight into the hostile nature of the Precambrian environment under which this life evolved. This has led to the area being otherwise known as the "Genesis of life".
In April 2014, scientists reported finding evidence of the largest terrestrial meteor impact event to date near the area. They estimated the impact occurred about 3.26 billion years ago and that the impactor was approximately between 37 and 58 kilometers (23 to 36 miles) wide. The crater from this event, if it still exists, has not yet been found. In May 2019, extraterrestrial organic materials in 3.3-billion-year-old volcanic rocks was found at Makhonjwa Mountains.
Swazis and other pastoral peoples probably grazed their livestock there, but not in large numbers, until the arrival of European settlers in the 1860s. Gold was discovered near Kaapsehoop in 1875, but it was the find by George Barber and his cousins Fred and Harry Barber that triggered a gold rush in 1884, leading to the founding of the town of Barberton. It was later overshadowed by the 1886 Witwatersrand Gold Rush.
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- Williamson, S. D.; Balkwill, K. (March 2015). "Plant census and floristic analysis of selected serpentine outcrops of the Barberton Greenstone Belt, Mpumalanga, South Africa". South African Journal of Botany.
- de Wit, Maarten (2010). "The deep-time treasure chest of the Makhonjwa Mountains" (PDF). South African journal of Science. Archived from the original (PDF) on 4 March 2016. Retrieved 10 December 2014.
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- Gill, Robin (15 February 2010). Igneous Rocks and Processes: A Practical Guide. John Wiley & Sons. p. 150. ISBN 9781444330656.
- "Scientists reconstruct ancient impact that dwarfs dinosaur-extinction blast". American Geophysical Union. April 9, 2014.
- Mandelbaum, Ryan F. (24 May 2019). "Extraterrestrial Organic Matter Found in 3.3-Billion-Year-Old Volcanic Rock". Gizmodo.
- "Barberton Makhonjwa Mountains". UNESCO.