Yudoma-Maya Highlands

The Yudoma-Maya Highlands (Russian: Юдомо-Майское нагорье, tr. Yudomo-Maiskoye Nagorye[1] are a mountainous area in the Sakha Republic and Khabarovsk Krai, Far Eastern Federal District, Russia.

Yudoma-Maya Highlands
Юдомо-Майское нагорье
View of the Maya River in mid October
Highest point
Peak	Shpil Tarbagannakh
Elevation	2,213 m (7,260 ft)
Coordinates	61°09′18″N 138°27′04″E
Dimensions
Length	500 km (310 mi)
Width	200 km (120 mi)
Geography
Location in the Far Eastern Federal District, Russia
Country	Russia
Federal subject	Sakha Republic Khabarovsk Krai
Range coordinates	59°0′N 136°0′E
Parent range	South Siberian System
Geology
Age of rock	Late Ordovician
Type of rock	Sandstone, clay, shale

The settlement of Allakh-Yun is located in the area of the highlands on the right bank of the Allakh-Yun River.

History

The area of the Yudoma-Maya and the Aldan highlands, between the basins of the Aldan River and the Yudoma, was uncharted territory well until the 1930s. It was first surveyed in 1934 by geologist Yuri Bilibin (1901—1952) together with mining engineer Evgeny Bobin (1897—1941) in the course of an expedition sent by the government of the USSR. Bilibin and Bobin made a thorough topographic survey of the mountainous regions leading separate research parties. They described the highlands as "a disordered jumble of round hills with soft outlines".[2]

Geography

The Yudoma-Maya Highlands are located in the upper basin of the Maya River, a tributary of the Aldan River, at the southern end of the Sakha Republic and the western limits of Khabarovsk Krai.[3] They are bound to the west by the Skalisty Range and the Sette-Daban subranges of the Verkhoyansk Range, and to the north by the Suntar-Khayata Range. The highlands reach the valley of the Okhota River to the east, and to the south they are limited by the northern end of the Dzhugdzhur Range. The average heights range between 800 metres (2,600 ft) and 1,200 metres (3,900 ft).[4]

The highest point is 2,213 meters (7,260 ft) high Shpil Tarbagannakh (Шпиль-Тарбаганнах). Other summits are 2,167 meters (7,110 ft) high Tarbaganakhskі Goltsi (Тарбаганахські Гольцы), 2,132 meters (6,995 ft) high Uemlyakhskі Goltsi (Уемляхські Гольцы) and 1,510 meters (4,950 ft) high Chelat (Челат).[5]

Climate

The highlands have a harsh continental climate. January temperatures range from −34 °C (−29 °F) to −43 °C (−45 °F). The coldest temperatures recorded reach between −58 °C (−72 °F) and −62 °C (−80 °F). In summer the average July temperature in the valleys does not exceed 18 °C (64 °F). Precipitation is between 250 millimeters (9.8 in) and 800 millimeters (31 in) per year. Most of the yearly precipitation falls in the second half of summer in the form of rain.

Flora

Large swathes of the highlands are covered by taiga up to elevations between 1,100 metres (3,600 ft) and 1,300 metres (4,300 ft). The areas adjacent to the valleys are covered with larch and pine forests, especially in the southern region. Above 500 metres (1,600 ft) there is spruce and birch taiga up to a height of 1,000 metres (3,300 ft). In the northern parts of the highlands there are thickets of dwarf cedar and mountain tundra above 1,200 metres (3,900 ft).[4]

References

1. Геоморфология России (Geomorphology of Russia)
2. Essays on the History of Geographical Discoveries (in Russian)
3. Google Earth
4. Юдомо-Майское нагорье / Great Soviet Encyclopedia; in 35 vol.] / Ch. ed. Yu.S. Osipov . - M .: Great Russian Encyclopedia, 2004—2017.
5. Atlas of Russia - Oymyakon Highlands sheet

External links

• First Sm-Nd data on Late Ordovician age of granitoids of the Verkhnyaya Maya Uplift, Okhotsk Massif