青藏高原班公湖-怒江缝合带中部的Moho错断
查看参考文献24篇
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文摘
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通过分析横跨班公湖-怒江缝合带中部的Hi-Climb剖面的53个宽频带台站记录的196个远震事件,总共获得了4764个接收函数.利用接收函数包含的Moho的Ps和PpPs的走时信息,获取了每个台站下方的地壳厚度和泊松比.接收函数CCP时深偏移的方法也被用来研究地壳和上地幔间断面的横向变化.研究结果显示:(1)拉萨地体和羌塘地体的Moho在班公湖-怒江缝合带附近叠置和存在约10km的错断,其构造的几何形态表现为拉萨地体的Moho向北抬升,而羌塘地体的Moho具有向南加深的趋势,推断和新生代以来班公湖-怒江缝合带构造活动的重新活跃有关;(2)泊松比沿整个剖面的变化为0.237~0.280,表明地壳物质主要为中酸性岩石.获得的所有台站的地壳厚度和泊松比呈现反相关关系,意味着羌塘地体南部地壳的增厚和拉萨地体的中酸性岩石逆冲插入羌塘地体有关;(3)地幔过渡带的厚度沿剖面维持在255km左右,说明印度板块和欧亚板块的碰撞所引起的构造活动局限在410km深度范围内 |
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来源
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科学通报
,2010,55(1):80-86 【核心库】
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关键词
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接收函数
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Moho错断
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CCP时深偏移
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上地幔间断面
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班公湖-怒江缝合带
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地址
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中国科学院青藏高原研究所, 北京, 100085
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0023-074X |
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学科
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地球物理学 |
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基金
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国家973计划
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文献收藏号
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CSCD:4018570
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