青藏高原东边缘地壳“管流”层的电磁探测证据
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摘要
通过对青藏高原东边缘及其附近地区石棉-乐山剖面大地电磁资料的研究发现,青藏高原东边缘带和四川地块的电性结构有明显差别,东部的四川地块地壳总体电阻率大,西部的青藏高原东边缘带地壳总体电阻率小.西部地壳分为上中下3层,中地壳为厚约10～15km的低阻层,电阻率最小达3～10Ωm,推测它含有较低黏滞度的部分熔融和(或)含盐流体,易于变形和流动,是青藏高原东边缘带向东南方向挤出作用下形成的"管流"层.它使上地壳和下地壳解耦,上地壳高阻的脆性层以左旋走滑和逆冲的断层运动为主,地表抬升,地震主要发生在上地壳内.低阻层把鲜水河-安宁河深大断裂带截成上下两段.地壳上、中、下层各自厚度的横向变化,综合产生了青藏高原东边缘带地壳厚度西部厚、东部薄、地形西部高、东部低的过渡带.
引文
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