东天山庙儿沟平顶冰川冰组构和微构造的特征分析

在德国Alfred-Wegener极地与海洋研究所用自动组构分析仪G50测试了东天山庙儿沟冰芯(43°03'19″N,94°19'21″E,4 512 m a.s.l.;2005年钻取,长58.7 m)冰微构造和组构,分析其特征并解释其所蕴含的意义。冰微构造和组构随深度的演变总体相似于其他中国山地冰川冰的观测结果,同时展示了其季节性特征。部分样品的测试结果有所波动,可能是样品在运输和存储过程中的热力学性质发生改变所致。组构型反应的力场较为简单,主要为中下部的单轴压应力作用。正常晶粒生长、多边形化作用和应变导致的边界迁移再结晶不能解释其在某一深段占据主导,而可能是三者共同作用于所有冰芯深部。

Analyzing characteristically on ice fabric and microstructure of Miaoergou glacier top-flatted,East Tianshan

In 2015,ice microstructure and fabric of Miaoergou ice core (43 03′19″ N,94 19′21″ E,4 512 m a.s.1.;extracted in 2005,the length is 58.7 m),East Tianshan were measured by Auto Fabric Analyzer G50 at Alfred-Wegener Institute for Polar and Marine,and then collected with the relevant characteristics to analyze and explain their implications.Both fabric and microstructure changes with depth show overall similar characteristics to other mountain glaciers,China,meanwhile they exhibit seasonal features.Certain fluctuations from parts of samples may be related to the change of thermal-dynamics during periods in which samples were transported and stored.The mechanical fields inferred using fabrics are quite simple and the uni-axis compression may dominate in the middle-low portions of this core.The normal grain growth,the rotation recrystallization or the straininduced boundary migration recrystallization is not suitable to be used to address which one dominates in some depth.So,it is possible that three processes co-operate in all depth.