Friday, September 14, 2018

Maha Oya Thermal Springs

Mahaoya Thermal Springs, Sri Lanka
Maha Oya Thermal Springs (also called Maha Oya hot water springs or thermal cluster) are in Ampara District, Sri Lanka. The site is located about 2.5 km distance from the Maha Oya town.

Hot water springs
BubblesCommonly, thermal springs in the world are associated with volcanic terrain but the hot springs located in Sri Lanka are said to be not related to volcanic activities as the island is not in an active volcanic or tectonic region (Premasiri et al., 2006). The waters can get heat either from subsurface heat sources such as large bodies of hot rocks or through deep percolation under the geochemical gradient of the earth (Adikaram & Dharmagunawardhane, 2013). If these water find weak structural discontinuities leading upward it rises to the surface and emerge as naturally discharging hot water springs.

Maha Oya springs
The Maha Oya springs occur in the boundary between Highland Complex (HC) and Vijayan Complex (VC). The boundary is a sub-horizontal ductile thrust zone where a number of geologic features are identified. They include major mineralization occurrences such as magnetite, serpentinite, gold, corundum and calcite as well as formations of hot water springs (Widanagamage, 2011). There are seven out flowing hot water wells at the Maha Oya springs site. The average temperature of the hottest well is about 58 °C while the lowest is 38 °C (Adikaram & Dharmagunawardhane, 2013).
Hot water wells, Mahaoya, Sri Lanka Hot water wells, Mahaoya, Sri Lanka
References
1) Adikaram, A.M.N.M., Dharmagunawardhane, H.A., 2013. Diurnal temperature variations in thermal water springs: A case study at Mahaoya thermal spring cluster, Sri Lanka.
2) Premasiri, H.M.R., Wijeyesekera, D.S., Weerawarnakula, S. and Puswewala, U.G.A., 2006. Formation of Hot Water Springs in Sri Lanka. Engineer: Journal of the Institution of Engineers, Sri Lanka. p.7.
3) Widanagamage, I.H., 2011. EMPA dating of monazite from high grade metamorphic rocks along the Highland-Vijayan boundary zone, Sri Lanka. MSc thesis, Kent State University. pp.17-18

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