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| DOI | 10.1016/j.tecto.2021.228810 |
| The silent bending of the oceanic Nazca Plate at the Peruvian Trench | |
| Contreras-Reyes E.; Cortés-Rivas V.; Manríquez P.; Maksymowicz A. | |
| 发表日期 | 2021 |
| ISSN | 00401951 |
| 卷号 | 807 |
| 英文摘要 | We predict the shape of the outer rise along the Peruvian Trench (6°-21°S) using flexural and gravity modelling in order to study the elastic properties of the subducting/oceanic Nazca Plate (NP). We include in our modelling the hotspot swell topography of the Nazca Ridge (NR) in the ridge-trench collision zone (~15°S). Results show an anomalous overthickening of the oceanic crust beneath the NR (from ~6 to 20 km), which is capable to produce most of the swell topography (500–700 km wide and up to 2.2 km high). The swell was formed likely under isostatic conditions (Te ~ 0 km) by the interaction of the NP with a hotspot-spreading center system. Despite the high buoyancy forces of the NR (0.5–4.0 × 1013 N/m) associated to the anomalous thick crust, the 45–50 Ma oceanic NP approaching the Peruvian Trench presents a well pronounced fore-bulge morphology with similar elastic thicknesses (Te = 35 ± 5 km) to those found for cold and old oceanic plate in the western Pacific. Consistently, our results do not show evidence for plate weakening (reduced Te values) in the NR-trench collision zone. We obtain similar results (Te = 40 ± 10 km) north of the NR implying that the oceanic NP is strong prior to subduction along most of the Peruvian convergent margin. This is consistent with the lack of great outer rise events (Mw ≥ 6) and the absence of reduced uppermost mantle velocities offshore Peru suggesting the presence of a poorly hydrated and rigid lithospheric mantle. © 2021 Elsevier B.V. |
| 关键词 | BendingElastic thicknessHotspotOuter risePeruSwell |
| 英文关键词 | Offshore oil well production; Planetary surface analysis; Buoyancy forces; Convergent margin; Elastic properties; Gravity modelling; Lithospheric mantle; Swell topography; Uppermost mantle; Western Pacific; Topography; mantle structure; Nazca plate; plate motion; plate tectonics; seafloor spreading; spreading center; subduction zone; Ica; Nazca; Peru |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207959 |
| 作者单位 | Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile; Centro Sismológico Nacional, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile |
| 推荐引用方式 GB/T 7714 | Contreras-Reyes E.,Cortés-Rivas V.,Manríquez P.,et al. The silent bending of the oceanic Nazca Plate at the Peruvian Trench[J],2021,807. |
| APA | Contreras-Reyes E.,Cortés-Rivas V.,Manríquez P.,&Maksymowicz A..(2021).The silent bending of the oceanic Nazca Plate at the Peruvian Trench.Tectonophysics,807. |
| MLA | Contreras-Reyes E.,et al."The silent bending of the oceanic Nazca Plate at the Peruvian Trench".Tectonophysics 807(2021). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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