New Constraints on the Complex Subduction and Tearing Model of the Cocos Plate Using Anisotropic Pn Tomography
文献类型：期刊论文
| 作者 | Lue, Yan1,4; Li, Juan1,4; Zhao, Lian-Feng1,4; Zhang, Jinhai3,4; Chen, Ling2,4; Zhao, Liang2,4 |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2023-10-01 |
| 卷号 | 24期号:10页码:11 |
| 关键词 | uppermost mantle Pn wave tomography Cocos plate slab tearing anisotropy |
| DOI | 10.1029/2023GC011124 |
| 英文摘要 | To better understand the structure and process of the Cocos plate subduction, we obtained the first Pn velocity and anisotropy model of the uppermost mantle in southern Mexico using the Pn tomography method and new ISC-EHB data. This study confirms that the subducted Cocos oceanic plate exhibits mid-oceanic ridge-perpendicular anisotropy, and there is an arc-parallel anisotropic structure beneath the subduction arc. The variation of the Pn velocity and anisotropy structure at the east and west ends of the flat-slab subduction zone in the Guerrero area provide new and clear seismological images for a plate-tearing model which might be caused by the Orozco and O'Gorman fracture zones. The Pn low-velocity and trench-perpendicular anisotropic structure found north of the flat-slab subduction zone support the slab retreat model of the Central Cocos plate. The Pn structure supports the existence of tearing corresponding to Teuhantepec Ridge in the Cocos plate beneath the Isthmus of Tuxtlas. Our study provides a reliable tomography basis and new constraints for a complicated subduction dynamics process in the southern Mexico subduction zone. The collision and subduction of the Cocos and North American plates created a complex geological structure in southern Mexico. Although some scholars proposed that there are some tears in the subducted Cocos slab based on the research of seismic parameters, the support of seismic tomography research for tear models is insufficient. Here, we applied a unique Pn tomography method and obtained the first Pn velocity and anisotropy model of the uppermost mantle in southern Mexico. The study clarified the mid-oceanic ridge-perpendicular anisotropy of the Cocos oceanic plate and the trench-parallel anisotropy beneath the subduction arc. The spatial variations in Pn velocity and anisotropic structure in southern Mexico provide new seismological constraints on the tears of the subducted Cocos plate corresponding to fracture zones. The observed low Pn velocity beneath the Trans-Mexican Volcanic Belt and the northern area and the trench-perpendicular anisotropy support the retreat model of the Central Cocos plate. Our study provides a new and reliable tomography basis for a complicated subduction dynamics process in the southern Mexico subduction zone and provides new constraints for a slab-tearing model corresponding to the fracture zones and the slab retreat model of the Central Cocos plate. The first Pn velocity and anisotropy model of the uppermost mantle in southern Mexico was providedA new seismological basis for the tears of the subducted Cocos plate corresponding to intra-oceanic weak zones is providedLow Pn velocity and trench-perpendicular anisotropy structure in the north of the Central Cocos plate support the slab retreat model |
| WOS关键词 | SHEAR-WAVE ANISOTROPY ; MEXICAN VOLCANIC BELT ; UPPER-MANTLE ; UPPERMOST MANTLE ; SEISMIC ANISOTROPY ; SLAB ; BENEATH ; TEHUANTEPEC ; DYNAMICS ; INSIGHTS |
| 资助项目 | National Natural Science Foundation of China[42274074] ; National Natural Science Foundation of China[42288201] ; National Natural Science Foundation of China[41874066] ; Key Research Program of the Institute of Geology & Geophysics, CAS[IGGCAS-201904] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| 出版者 | AMER GEOPHYSICAL UNION |
| WOS记录号 | WOS:001073033700001 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS ; Key Research Program of the Institute of Geology & Geophysics, CAS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/110816]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 地质与地球物理研究所_岩石圈演化国家重点实验室 地质与地球物理研究所_深部资源勘探装备研发 |
| 通讯作者 | Lue, Yan |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, CAS Engn Lab Deep Resources Equipment & Technol, Beijing, Peoples R China 4.Univ Chinese Acad Sci, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lue, Yan,Li, Juan,Zhao, Lian-Feng,et al. New Constraints on the Complex Subduction and Tearing Model of the Cocos Plate Using Anisotropic Pn Tomography[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2023,24(10):11. |
| APA | Lue, Yan,Li, Juan,Zhao, Lian-Feng,Zhang, Jinhai,Chen, Ling,&Zhao, Liang.(2023).New Constraints on the Complex Subduction and Tearing Model of the Cocos Plate Using Anisotropic Pn Tomography.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,24(10),11. |
| MLA | Lue, Yan,et al."New Constraints on the Complex Subduction and Tearing Model of the Cocos Plate Using Anisotropic Pn Tomography".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 24.10(2023):11. |
入库方式： OAI收割
来源：地质与地球物理研究所
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