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Puruogangri Ice Field 普若岗日冰原

The Puruogangri, the largest modern ice field in the Tibetan Plateau with an area of over 400 km2 in total.在青藏高原中央、普若岗日冰原西侧流石坡地带山麓面上,分布有约100 km2的由戈壁与沙丘组成的地貌,这是世界罕见的、也是我国发现的首例中纬度、高海拔地区冰前沙漠沉积.野外地貌、地层测量和室内样品的粒度、矿物、 14C测年分析等结果表明,其形成时代约为16 ka BP以来;沉积特征在沙丘沉积序列中表现为风成砂夹零星腐殖质层,在戈壁中表现为砾石表面具次生方解石或碳酸钙沉淀层;演化模式为冷直线式;形成条件为以下伏冰碛物为主要砂源,以行星西风环流和高原冬季风引起的地面西风为主要动力,以持续的寒冷半干旱为气候背景;成因主要与冰原西缘冰川作用形成丰富的冰碛物砂源有关;因此,这类沙漠与一般冰缘沙漠以河湖相砂为源具有显著区别,可称为"冰川型沙漠".由于其形成兼与冰原、气候和环流的变化密切相关,所以它是高原腹地全新世气候环境变化的重要记录.

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changturtle (updated 15 years ago)

lat: 33.9068946838, long: 89.12109375

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