New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave Attenuation
Abstract Teleseismic body‐wave attenuation provides an independent constraint on the architecture of the lithosphere‐asthenosphere system. We obtain the first map of teleseismic attenuation across South China, which correlates well with previous estimates of lithospheric thickness. The weakest atten...
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Wiley
2021-03-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2020GL091654 |
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| author | Yangfan Deng Joseph S. Byrnes Maximiliano Bezada |
| author_facet | Yangfan Deng Joseph S. Byrnes Maximiliano Bezada |
| author_sort | Yangfan Deng |
| collection | DOAJ |
| description | Abstract Teleseismic body‐wave attenuation provides an independent constraint on the architecture of the lithosphere‐asthenosphere system. We obtain the first map of teleseismic attenuation across South China, which correlates well with previous estimates of lithospheric thickness. The weakest attenuation occurs in the Sichuan Basin, where continental lithosphere is thick, and in the adjacent Chuandian region, which we attribute to delaminated lithosphere, or lithosphere strengthened by an ancient plume based on comparison with previous studies. Smaller batches of remnant or delaminated lithosphere may cause local minima along the eastern coast. Pronounced negative anomalies occur in the Hengyang, Jianghan and Nanchang basins, motivating the hypothesis that the basins occur where locally strong blocks within the lithosphere resisted the pervasive deformation of South China. The strongest attenuation occurs in a broad region in the vicinity of the Hainan plume, which is consistent with high temperatures and possibly partial melt in the upper mantle. |
| format | Article |
| id | doaj-art-d837a5a89a0a4b1ca439ad49ff88341e |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2021-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-d837a5a89a0a4b1ca439ad49ff88341e2025-08-20T02:11:09ZengWileyGeophysical Research Letters0094-82761944-80072021-03-01486n/an/a10.1029/2020GL091654New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave AttenuationYangfan Deng0Joseph S. Byrnes1Maximiliano Bezada2State Key Laboratory of Isotope Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou ChinaDepartment of Earth & Environmental Sciences University of Minnesota Twin Cities MN USADepartment of Earth & Environmental Sciences University of Minnesota Twin Cities MN USAAbstract Teleseismic body‐wave attenuation provides an independent constraint on the architecture of the lithosphere‐asthenosphere system. We obtain the first map of teleseismic attenuation across South China, which correlates well with previous estimates of lithospheric thickness. The weakest attenuation occurs in the Sichuan Basin, where continental lithosphere is thick, and in the adjacent Chuandian region, which we attribute to delaminated lithosphere, or lithosphere strengthened by an ancient plume based on comparison with previous studies. Smaller batches of remnant or delaminated lithosphere may cause local minima along the eastern coast. Pronounced negative anomalies occur in the Hengyang, Jianghan and Nanchang basins, motivating the hypothesis that the basins occur where locally strong blocks within the lithosphere resisted the pervasive deformation of South China. The strongest attenuation occurs in a broad region in the vicinity of the Hainan plume, which is consistent with high temperatures and possibly partial melt in the upper mantle.https://doi.org/10.1029/2020GL091654attenuationdelaminationHainan plumelithospheric thickness |
| spellingShingle | Yangfan Deng Joseph S. Byrnes Maximiliano Bezada New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave Attenuation Geophysical Research Letters attenuation delamination Hainan plume lithospheric thickness |
| title | New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave Attenuation |
| title_full | New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave Attenuation |
| title_fullStr | New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave Attenuation |
| title_full_unstemmed | New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave Attenuation |
| title_short | New Insights Into the Heterogeneity of the Lithosphere‐Asthenosphere System Beneath South China From Teleseismic Body‐Wave Attenuation |
| title_sort | new insights into the heterogeneity of the lithosphere asthenosphere system beneath south china from teleseismic body wave attenuation |
| topic | attenuation delamination Hainan plume lithospheric thickness |
| url | https://doi.org/10.1029/2020GL091654 |
| work_keys_str_mv | AT yangfandeng newinsightsintotheheterogeneityofthelithosphereasthenospheresystembeneathsouthchinafromteleseismicbodywaveattenuation AT josephsbyrnes newinsightsintotheheterogeneityofthelithosphereasthenospheresystembeneathsouthchinafromteleseismicbodywaveattenuation AT maximilianobezada newinsightsintotheheterogeneityofthelithosphereasthenospheresystembeneathsouthchinafromteleseismicbodywaveattenuation |