乌鲁木齐河源1号冰川积累区透底冰芯地层及冰结构分析

Stratigraphic and Structural Analysis on An Ice Core to the Bedrock in the Accumulation Area of Glacier No 1 at the Headwaters of Urumqi River

对乌鲁木齐河源１号冰川积累区一支深达９１．６４ｍ的透底冰芯进行了详细的层位及冰结构分析，结果表明，在２０ｍ深度以内，很好地保存了原始沉积的特征，但在７０～８０ｍ深处还发现小密度的乳白色冰占优势的冰层，可能形成于小冰期，中层具有动力变质及再结晶作用共存及反复消长的结构特征（冰晶尺寸、气泡），未见单极大型组构，但出现弱竖环形组构。

An ice core 91.64 m in Length, to the bedrock extracted from the accumulation area of the Glacier No 1 at the headwater of the Urumqi River was analysed for its stratigraphy and structure in detail The original depositional features are well preserved within the top 20 m, but milk-like white ice with lower density is discovered in the depth of 70～80 m It is suggested that the ice at this depth was deposited in the Little Ice Age The ice at the middle part of the core is characterized by dynamic metamorphism and recrystallization, displaying repeatedly reducing-growing features in crystal size and air bubble No single-maximum fabric can be seen but a weak vertical circle fabric is observed Weak diamond-like multiple maximum fabric appears only in the bottom part