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地质学报  2005 

藏南上地壳低速高导层的性质与分布:来自热水流体活动的证据

, PP. 68-77

Keywords: 藏南,部分熔融层,热水流体,He同位素

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Abstract:

沿亚东―谷露裂谷带实施的一系列地球物理探测发现了一组地震亮点。结合其他地球物理探测剖面的资料,认为藏南上地壳中存在一个低速高导层,这些地震亮点处于这个低速高导层中。人们对这些亮点和低速高导层有两种不同的解释和认识:一种认为是含盐的超临界流体;而另一种认为是地壳中的部分熔融层。由于目前缺少有效的手段和方法,对这个低速高导层的性质和分布范围仍只是推测。本文从藏南强烈活动的热水流体系统着手,尝试从另一个角度探讨这些地震亮点和低速高导层的性质。通过对热泉气体的He同位素组成和热水的地球化学特征研究以及前人对温度场的模拟表明,该低速高导层的性质为硅酸盐岩浆熔体,不是以水为主的流体,这就为部分熔融层的存在提供了佐证。本文进一步讨论了该部分熔融层对热泉流体系统的驱动热机作用,并根据热泉流体的温度场限定了此部分熔融层的空间分布范围。

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