Upper mantle and lithospheric heterogeneities in central and eastern Europe as observed by teleseismic receiver functions
Upper mantle and lithospheric heterogeneities in central and eastern Europe as observed by teleseismic receiver functions
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DOI：
10.1111/j.1365-246x.2008.03767.x
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发表时间：
2008-07
影响因子：
2.8
通讯作者：
W. Geissler;R. Kind;X. Yuan
中科院分区：
文献类型：
--
作者：
W. Geissler;R. Kind;X. Yuan
使用Ps接收器函数分析了遍布中欧和东欧的90个永久性宽带站的概要数据，以研究向下至地幔过渡带的地壳和上地幔结构。接收器功能提供了关于结构特征的宝贵信息，这些信息对欧洲岩石圈动力学的分辨率很重要。莫霍面深度从中欧伸展地区的不到25公里到东欧(克拉通)和阿尔卑斯山-喀尔巴西亚带下方的站超过50公里不等。在上莱茵格拉本地区(约25公里)的观测站可以观测到很浅的莫霍面深度，而例如，波西米亚地块西南部的观测站在38公里深度处显示出明显更深的莫霍面。Vp/Vs比值在1.60~1.96之间变化，与主要构造单元没有明显的相关性，可能代表了地壳成分的局部变化。中欧许多台站观测到地幔过渡区转换相的延迟到达，而克拉通地区的台站与根据IASP91地球参考模型计算的结果相比，表现出较早的到达。P410S和P660S相之间的延迟时间差异表明，东部阿尔卑斯山、喀尔巴底山脉和巴尔干半岛北部之下存在增厚的地幔过渡带，而东欧和中欧的过渡带厚度与IASP91值一致。东部阿尔卑斯山和喀尔巴鄂山脉下方地幔过渡带的加厚可能是由冷的、深度俯冲的洋板造成的。
SUMMARY Data from 90 permanent broad-band stations spread over central and eastern Europe were analysed using Ps receiver functions to study the crustal and upper-mantle structure down to the mantle transition zone. Receiver functions provide valuable information on structural features, which are important for the resolution of European lithospheric dynamics. Moho depths vary from less than 25 km in extensional areas in central Europe to more than 50 km at stations in eastern Europe (Craton) and beneath the Alpine‐Carpathian belt. A very shallow Moho depth can be observed at stations in the Upper Rhine Graben area (ca. 25 km), whereas, for example, stations in the SW Bohemian Massif show a significantly deeper Moho interface at a depth of 38 km. Vp/Vs ratios vary between 1.60 and 1.96, and show no clear correlation to the major tectonic units, thus probably representing local variations in crustal composition. Delayed arrivals of converted phases from the mantle transition zone are observed at many stations in central Europe, whereas stations in the cratonic area show earlier arrivals compared with those calculated from the IASP91 Earth reference model. Differential delay times between the P410s and P660s phases indicate a thickened mantle transition zone beneath the eastern Alps, the Carpathians and the northern Balkan peninsula, whereas the transition zone thickness in eastern and central Europe agrees with the IASP91 value. The thickening of the mantle transition zone beneath the eastern Alps and the Carpathians could be caused by cold, deeply subducted oceanic slabs.