Synthesizing EarthScope data to constrain the thermal evolution of the continental U.S. lithosphere
Synthesizing EarthScope data to constrain the thermal evolution of the continental U.S. lithosphere
复制标题
综合 EarthScope 数据来约束美国大陆岩石圈的热演化
DOI：
10.1130/ges02000.1
复制
发表时间：
2019
期刊：
影响因子：
2.5
通讯作者：
S. Whitmeyer
中科院分区：
文献类型：
--
作者：
R. Porter;S. Lee;S. Whitmeyer
在这项工作中，我们编译了几个地震速度模型公开提供的公司地震研究所（IRIS）地球模型合作（EMC）和比较地壳下地幔速度的模型，彼此和整个大陆的构造运动的时间。这项工作使我们能够评估的时间之间的关系，因为最近的热构造事件和上地幔温度。我们应用矿物和物理为基础的模型的速度-温度关系来计算上地幔温度，以确定下地壳和上地幔热构造活动后的冷却速率。结果表明，大部分的冷却发生在奥陶纪之后的300-500万年。这项工作总结了目前估计的上地幔剪切速度，并提供了见解大陆岩石圈的热稳定通过时间。
In this work, we compile several seismic velocity models publicly available from the Incorporated Research Institute for Seismology (IRIS) Earth Model Collaboration (EMC) and compare subcrustal mantle velocities in the models to each other and to the timing of tectonism across the continent. This work allows us to assess the relationship between the time elapsed since the most recent thermotectonic event and uppermost mantle temperatures. We apply mineral- and physics-based models of velocity-temperature relationships to calculate upper-mantle temperatures in order to determine cooling rates for the lower-crust and uppermost mantle following thermotectonic activity. Results show that most of the cooling occurs in the ∼300–500 million years following orogeny. This work summarizes current estimates of upper-mantle shear velocities and provides insights on the thermal stabilization of continental lithosphere through time.