The diamictite occupays 82% of the rocks in the profile of Nantuo For- mation, of which the gravel composition is complicated, including sandstone, slate, marble, granite etc. Glacial striae and polished surfaces can be found in the large gravels.
The erosion altitude 9 cm was determined by the glacial rock surface under big stone and surround rock surface. The erosion rate of granite can be calculated : 6. 42*10 cm/a( through samples: X8 X9) .
Based on investigations and studies of modern and ancient glaciers around the Tanggula Pass,dating of cosmogenic radionuclide 10Be exposure age of the last glacial moraine bounders(or striated outcrops) of this region,four data,i. e. ,(16.1±1.7) ka BP,(31.9±3.4) ka BP,(41.4±4.3) ka BP and(66.8±4.3) ka BP,were gained.
在野外综合考察的基础上,对唐古拉山垭口地区末次冰期的冰碛漂砾(或有冰川擦痕的露头)进行了宇生核素10Be暴露年龄的测定,得到(16.1±1.7)ka BP、(31.9±3.4)ka BP、(41.4±4.3)kaBP和(66.8±4.3)ka BP 4个测年数据.
The striation density in 10 μm showed a marked tendency to increase with the decrease of the valve length in both raphe and rapheless valves, and this tendency did not vary with locality or environmental condition.