利用接收函数研究青藏高原东南缘的地壳上地幔结构

被引：33

作者：

徐强 ^{[1
]}

赵俊猛 ^{[1
]}

崔仲雄 ^{[1
]}

刘明乾 ^{[2
]}

机构：

[1] 中国科学院青藏高原研究所

[2] 东方地球物理公司研究院长庆分院

来源：

地球物理学报 | 2009年 / 52卷 / 12期

关键词：

P波接收函数; S波接收函数; 地幔过渡带; 泊松比;

D O I：

暂无

中图分类号：

P315 [地震学];

学科分类号：

摘要：

本文使用位于青藏高原东南缘的25个地震台站的远震数据,采用P波和S波接收函数的方法研究了台站下方的Moho深度、泊松比以及地幔过渡带的厚度.计算结果表明:①青藏高原东南缘的地壳厚度由松潘—甘孜地体和羌塘地体的约60km,向邻区的印支地体以及扬子板块分别减薄为约38km和约42km;②羌塘地体的泊松比主要集中范围为0.25～0.28,地壳物质组分主要为中基性岩石,推测与下地壳镁铁质成分的增加有关.松潘—甘孜块体、印支块体和扬子板块的泊松比为0.25～0.26,主要为中酸性岩石组分.缺乏高的泊松比(≥0.30)分布表明青藏高原东南缘的地壳不存在广泛的部分熔融,但是不排除局部部分熔融的存在;③青藏高原东南缘的羌塘地体内存在一个比较明显的、异常变化范围为10～26km的地幔过渡带增厚区域,其对应着地幔过渡带内100℃～260℃的温度降低,可以推断与此异常区域的地幔过渡带内存在俯冲的板块有关.

引用

页码：3001 / 3008

页数：8

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