Near‐axis crustal structure and thickness of the Endeavour Segment, Juan de Fuca Ridge
Abstract A model of crustal thickness and lower crustal velocities is obtained for crustal ages of 0.1–1.2 Ma on the Endeavour Segment of the Juan de Fuca Ridge by inverting travel times of crustal paths and non‐ridge‐crossing wide‐angle Moho reflections obtained from a three‐dimensional tomographic...
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| Format: | Article |
| Language: | English |
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Wiley
2016-06-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1002/2016GL068182 |
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| author | Dax Soule William S. D. Wilcock Douglas R. Toomey Emilie E. E. Hooft Robert T. Weekly |
| author_facet | Dax Soule William S. D. Wilcock Douglas R. Toomey Emilie E. E. Hooft Robert T. Weekly |
| author_sort | Dax Soule |
| collection | DOAJ |
| description | Abstract A model of crustal thickness and lower crustal velocities is obtained for crustal ages of 0.1–1.2 Ma on the Endeavour Segment of the Juan de Fuca Ridge by inverting travel times of crustal paths and non‐ridge‐crossing wide‐angle Moho reflections obtained from a three‐dimensional tomographic experiment. The crust is thicker by 0.5–1 km beneath a 200 m high plateau that extends across the segment center. This feature is consistent with the influence of the proposed Heckle melt anomaly on the spreading center. The history of ridge propagation on the Cobb overlapping spreading center may also have influenced the formation of the plateau. The sharp boundaries of the plateau and crustal thickness anomaly suggest that melt transport is predominantly upward in the crust. Lower crustal velocities are lower at the ends of the segment, likely due to increased hydrothermal alteration in regions influenced by overlapping spreading centers, and possibly increased magmatic differentiation. |
| format | Article |
| id | doaj-art-8a4efd07aa05430da77fad419b96d397 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2016-06-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-8a4efd07aa05430da77fad419b96d3972025-08-20T02:31:41ZengWileyGeophysical Research Letters0094-82761944-80072016-06-0143115688569510.1002/2016GL068182Near‐axis crustal structure and thickness of the Endeavour Segment, Juan de Fuca RidgeDax Soule0William S. D. Wilcock1Douglas R. Toomey2Emilie E. E. Hooft3Robert T. Weekly4School of Oceanography University of Washington Seattle Washington USASchool of Oceanography University of Washington Seattle Washington USADepartment of Geological Sciences University of Oregon Eugene Oregon USADepartment of Geological Sciences University of Oregon Eugene Oregon USASchool of Oceanography University of Washington Seattle Washington USAAbstract A model of crustal thickness and lower crustal velocities is obtained for crustal ages of 0.1–1.2 Ma on the Endeavour Segment of the Juan de Fuca Ridge by inverting travel times of crustal paths and non‐ridge‐crossing wide‐angle Moho reflections obtained from a three‐dimensional tomographic experiment. The crust is thicker by 0.5–1 km beneath a 200 m high plateau that extends across the segment center. This feature is consistent with the influence of the proposed Heckle melt anomaly on the spreading center. The history of ridge propagation on the Cobb overlapping spreading center may also have influenced the formation of the plateau. The sharp boundaries of the plateau and crustal thickness anomaly suggest that melt transport is predominantly upward in the crust. Lower crustal velocities are lower at the ends of the segment, likely due to increased hydrothermal alteration in regions influenced by overlapping spreading centers, and possibly increased magmatic differentiation.https://doi.org/10.1002/2016GL068182Juan de Fuca Ridgeocean spreading centercrustal thicknessseismic tomography |
| spellingShingle | Dax Soule William S. D. Wilcock Douglas R. Toomey Emilie E. E. Hooft Robert T. Weekly Near‐axis crustal structure and thickness of the Endeavour Segment, Juan de Fuca Ridge Geophysical Research Letters Juan de Fuca Ridge ocean spreading center crustal thickness seismic tomography |
| title | Near‐axis crustal structure and thickness of the Endeavour Segment, Juan de Fuca Ridge |
| title_full | Near‐axis crustal structure and thickness of the Endeavour Segment, Juan de Fuca Ridge |
| title_fullStr | Near‐axis crustal structure and thickness of the Endeavour Segment, Juan de Fuca Ridge |
| title_full_unstemmed | Near‐axis crustal structure and thickness of the Endeavour Segment, Juan de Fuca Ridge |
| title_short | Near‐axis crustal structure and thickness of the Endeavour Segment, Juan de Fuca Ridge |
| title_sort | near axis crustal structure and thickness of the endeavour segment juan de fuca ridge |
| topic | Juan de Fuca Ridge ocean spreading center crustal thickness seismic tomography |
| url | https://doi.org/10.1002/2016GL068182 |
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