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地理学报  2003 

西藏枪勇冰川冰下富碎屑化学沉淀特征与冰下过程

DOI: 10.11821/xb200305015, PP. 757-764

Keywords: 西藏枪勇冰川,冰下化学沉淀,冰下过程,大陆性冰川

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Abstract:

西藏枪勇冰川是我国现代大陆性冰川之一,在其外缘冰床背冰面的基岩表面和节理裂隙中发现了富碎屑化学沉淀,为研究冰岩界面的物理、化学过程提供了良好载体。对该区富碎屑化学沉淀理化特征的研究表明枪勇冰川冰下存在压力融水,冰下碎屑,特别是陆源气溶胶粉尘来源的碎屑,能与融水及其中溶解的CO2发生化学反应,释放出Ca++;Ca++随融水向下游方向迁移,在冰床背冰面,由于上覆压力减小,融水中的CO2逸出并发生复冰作用,使融水中的Ca++重新富集,形成CaCO3沉淀,并将融水中的粉砂粘粒碎屑胶结,形成富碎屑化学沉淀;枪勇冰川冰下融水的存在,证明其冰下存在温度接近融点的融区,有类似于温性冰川的滑动过程。

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