Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL074518 |
How Sharp Is the Cratonic Lithosphere-Asthenosphere Transition? | |
Mancinelli, Nicholas J.; Fischer, Karen M.; Dalton, Colleen A. | |
2017-10-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:20 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Earth's cratonic mantle lithosphere is distinguished by high seismic wave velocities that extend to depths greater than 200 km, but recent studies disagree on the magnitude and depth extent of the velocity gradient at their lower boundary. Here we analyze and model the frequency dependence of Sp waves to constrain the lithosphere-asthenosphere velocity gradient at long-lived stations on cratons in North America, Africa, Australia, and Eurasia. Beneath 33 of 44 stations, negative velocity gradients at depths greater than 150 km are less than a 2-3% velocity drop distributed over more than 80 km. In these regions the base of the typical cratonic lithosphere is gradual enough to be explained by a thermal transition. Vertically sharper lithosphere-asthenosphere transitions are permitted beneath 11 stations, but these zones are spatially intermittent. These results demonstrate that lithosphere-asthenosphere viscosity contrasts and coupling fundamentally differ between cratons and younger continents. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416761600013 |
WOS关键词 | S-RECEIVER FUNCTIONS ; SHEAR-VELOCITY MODEL ; UPPER-MANTLE ; UNITED-STATES ; MIDLITHOSPHERIC DISCONTINUITIES ; ELECTRICAL-RESISTIVITY ; MAGNETOTELLURIC DATA ; CONTINENTAL MANTLE ; KALAHARI CRATON ; FREE-SURFACE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25865 |
专题 | 气候变化 |
作者单位 | Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA |
推荐引用方式 GB/T 7714 | Mancinelli, Nicholas J.,Fischer, Karen M.,Dalton, Colleen A.. How Sharp Is the Cratonic Lithosphere-Asthenosphere Transition?[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(20). |
APA | Mancinelli, Nicholas J.,Fischer, Karen M.,&Dalton, Colleen A..(2017).How Sharp Is the Cratonic Lithosphere-Asthenosphere Transition?.GEOPHYSICAL RESEARCH LETTERS,44(20). |
MLA | Mancinelli, Nicholas J.,et al."How Sharp Is the Cratonic Lithosphere-Asthenosphere Transition?".GEOPHYSICAL RESEARCH LETTERS 44.20(2017). |
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