期刊
GEOPHYSICAL RESEARCH LETTERS
卷 48, 期 5, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL091074
关键词
-
资金
- U.S. National Science Foundation [EAR-1736167, EAR-1930014]
A high-resolution shear velocity model of eastern North America was constructed using full-wave ambient noise simulation and inversion integrating onshore and offshore seismic datasets, revealing large lateral variations of lithosphere thickness, strong low-velocity anomalies underneath the thinner lithosphere, and multiple low-velocity layers within the continental lithosphere. The results suggest that multiple tectonic processes and metasomatism have played significant roles in the formation and modification of the present mantle lithosphere beneath eastern North America.
Lithospheric layering contains critical information about continental formation and evolution. However, discrepancies on the depth distributions of lithospheric layers have significantly limited our understanding of possible tectonic connections among the layers. Here, we construct a high-resolution shear velocity model of eastern North America using full-wave ambient noise simulation and inversion by integrating onshore and offshore seismic datasets. Our new model reveals large lateral variations of lithosphere thickness approximately across the major tectonic boundaries, strong low-velocity anomalies underlying the thinner lithosphere, and multiple low-velocity layers within the continental lithosphere. We suggest that the present mantle lithosphere beneath eastern North America was formed and modified through multiple stages of tectonic processes, among which metasomatism may have significantly contributed to the observed intralithospheric low-velocity layers. The sharp thickness variation of lithosphere promoted edge-driven mantle convection, which has been consequently modifying the overlying mantle lithosphere and further sharpening the gradient of lithosphere thickness
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据