Lithospheric records of orogeny within the continental U.S.
Lithospheric records of orogeny within the continental U.S.
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DOI：
10.1002/2015gl066950
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发表时间：
2016-01
影响因子：
5.2
通讯作者：
R. Porter;Yuanyuan Liu;W. Holt
中科院分区：
文献类型：
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作者：
R. Porter;Yuanyuan Liu;W. Holt
为了更好地了解北美大陆的构造演化，我们利用EarthScope Transportable Array网络的数据来计算美国大陆的三维剪切速度模型。该模型是通过使用环境噪声层析成像和波梯度测量法计算的瑞利波相速度的反演产生的，该方法允许对宽深度范围的灵敏度。该模型中的剪切速度突出了造山和造山后事件对岩石圈演化的影响。最值得注意的是相对较慢的北美西部和相对较快的北美东部之间的地壳和上地幔结构的对比。这些差异不太可能仅仅源于岩石圈内的热变化，并突出了美国大陆岩石圈结构的复杂性以及造山带对地壳和上地幔的不同影响。
In order to better understand the tectonic evolution of the North American continent, we utilize data from the EarthScope Transportable Array network to calculate a three‐dimensional shear velocity model for the continental United States. This model was produced through the inversion of Rayleigh wave phase velocities calculated using ambient noise tomography and wave gradiometry, which allows for sensitivity to a broad depth range. Shear velocities within this model highlight the influence of orogenic and postorogenic events on the evolution of the lithosphere. Most notable is the contrast in crustal and upper mantle structure between the relatively slow western and relatively fast eastern North America. These differences are unlikely to stem solely from thermal variations within the lithosphere and highlight both the complexities in lithospheric structure across the continental U.S. and the varying impacts that orogeny can have on the crust and upper mantle.