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Gangotri Glacier (Sanskrit, Nepali and (ヒンディー語:गंगोत्री)) is located in Uttarkashi District, Uttarakhand, India in a region bordering China. This glacier, one of the primary sources of the Ganges, is one of the largest in the Himalayas with an estimated volume of over 27 cubic kilometers. The glacier is about 30 kilometres (19 miles) long and 2 to 4 km (1 to 2 mi) wide. Around the glacier are the peaks of the Gangotri Group, including several peaks notable for extremely challenging climbing routes, such as Shivling, Thalay Sagar, Meru, and Bhagirathi III. It flows roughly northwest, originating in a cirque below Chaukhamba, the highest peak of the group. The terminus of the Gangotri Glacier is said to resemble a cow's mouth, and the place is called Gomukh or Gaumukh (''gou'', cow + ''mukh'', face). Gomukh, which is about from the town of Gangotri, is the precise source of the Bhagirathi river, an important tributary of the Ganges. Gomukh is situated near the base of Shivling; in between lies the Tapovan meadow. The Gangotri glacier is a traditional Hindu pilgrimage site. Devout Hindus consider bathing in the icy waters near Gangotri town to be a holy ritual, and many made the trek to Gomukh, with a few continuing on to Tapovan. One needs to trek from Gangotri till Gaumukh, passing Devgadh, Chirbhasa, Bhojwasa en route. Currently accommodation is available only at Bhojwasa, although forest check posts are present at both Chirbhasa and Bhowasa. The 2013 North Indian Floods destroyed much of this trail, and access is now a little difficult beyond Chirbhasa due to trail deterioration and a 2 km wide rockfall site. ==Geology== It is a valley-type glacier, situated in the Uttarkashi district of Garhwal Himalaya, Uttarakhand(Figure 1) and it flows to NW direction. This glacier is bound between 30°43'22"–30°55'49" (lat.) and 79°4'41"–79°16'34" (long.), extending in height from 4120 to 7000 m.a.s.l. This area is situated north of the Main Central Thrust (MCT) and is made up of bedrocks of granites, garnet mica schist, quartz biotite schist, kyanite schist, augen gneiss and banded augen gneiss.〔Metcalfe, R. P., Geol. Soc. London, 1993, 74, 495–509.〕 the glacier is composed of a variety of depositional features such as talus cones, snow-avalanche fans, snow-bridges, and dead ice mounds, and erosional features like pyramidal and conical peaks, serrated ridge crests, glacial troughs, smooth rock walls, crags and tails, waterfalls, rock basins, gullies and glacial lakes. All along the Gangotri glacier, several longitudinal and transverse crevasses are formed along which ice blocks have broken down. The ablation zone of the Gangotri glacier is covered by a thick pile of supraglacial moraines and is characterized by several ice sections, melting into pools of supraglacial lakes. Because of subsidence and the fast degenerating nature of the glacier, its centre is full of supraglacial lakes. In this part of higher Himalaya, glacial melt-water dominates the fluvial system. The total ice cover is approximately 200 km² and has about 20 km³ of ice in volume.〔Vohra, C. P., in The Himalayas: Aspects of Change (eds Lall, J. S. and Moddie, A. D.), Oxford University Press, New Delhi, 1981, pp 138–151.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gangotri Glacier」の詳細全文を読む スポンサード リンク
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