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首页> 外文期刊>Geophysical Research Letters >Lithospheric velocity model of Texas and implications for the Ouachita orogeny and the opening of the Gulf of Mexico
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Lithospheric velocity model of Texas and implications for the Ouachita orogeny and the opening of the Gulf of Mexico

机译：德克萨斯州的岩石圈速度模型及其对沃希塔造山带和墨西哥湾开放的影响

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摘要

A 3-D shear wave velocity model of Texas has been developed from Rayleigh wave phase velocities by using ambient noise data recorded at the USArray stations. In the upper crust, the Ouachita front separates high velocity in the Laurentia to its west from low velocity in the east and south Texas basins. The Ouachita belt is characterized as a high-velocity zone with local maximums coinciding with known uplifts, which we interpret as accreted island arcs during the Ouachita orogeny. Our model evidences a strong Ouachita lithosphere that helped to buffer crust thinning from the Mesozoic rifting. A significantly low-velocity anomaly is present in southeast Texas in the lower crust and upper mantle. We associate this anomaly with a past asthenosphere upwelling that likely originated from the edge of the subducted slab during the Ouachita collision and was potentially responsible for the opening of the Gulf of Mexico.
机译：通过使用在USArray站记录的环境噪声数据，根据瑞利波的相速度开发了Texas的3-D剪切波速度模型。在上地壳中，瓦希托锋将Laurentia西部的高速与德克萨斯州东部和南部盆地的低速分开。沃希托带的特征是高速度带，其局部最大值与已知的隆升相吻合，我们将其解释为沃希托造山过程中的增生的岛弧。我们的模型证明了强大的瓦希塔岩石圈有助于缓冲中生代裂谷引起的地壳变薄。在得克萨斯州东南部的下地壳和上地幔中存在明显的低速异常。我们将此异常与过去的软流层上升相关联，该上升流可能源于Ouachita碰撞时俯冲板块的边缘，可能是墨西哥湾开放的原因。

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