| DOI: | 10.1016/j.gloplacha.2014.08.002
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| 论文题名: | Plate convergence west of Patagonia and the Antarctic Peninsula since 61Ma |
| 作者: | Eagles G.; Scott B.G.C.
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| ISSN: | 0921-8400
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| 出版年: | 2014
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| 卷: | 123 | | 起始页码: | 189
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| 结束页码: | 198
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| 语种: | 英语
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| 英文关键词: | Antarctica
; Fracture zones
; Pacific Ocean
; Plate motion
; Seafloor spreading
; Subduction
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| Scopus关键词: | Kinematics
; Oceanography
; Antarctica
; Fracture zone
; Pacific ocean
; Plate motions
; Seafloor spreading
; Subduction
; Tectonics
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| 英文摘要: | A new plate kinematic model portrays plate motions immediately west and south of Drake Passage in the southeast Pacific Ocean. Overall intermediate-to-slow rate spreading generated oceanic lithosphere as the Phoenix plate diverged from the Antarctic plate. The model shows a history of Phoenix plate motion that is interpretable as having been affected by a northeast-increasing gradient in the slab pull force since chron 18 (39. Ma), during which time newer, less dense lithosphere was subducting in the southwest than in the northeast. The model allows first calculations of Phoenix-Farallon (Nazca) plate motion parameters in the south Pacific plate circuit. Using these parameters, it is possible to show that the simplest assumptions about the ridge's segmentation, length and migration are consistent with existing suggestions of its location from consideration of slab window-related volcanism at sites in South America around 50 and 20. Ma. The parameters thus define ridge locations that can be used to define which plates were subducting beneath South America and the Magallanes and Antarctic plates, and when. We consider the relationships between the plate convergence rate, obliquity and the history of magmatism on the Antarctic Peninsula and at the North Patagonian batholith, showing that magmatic pulses can be related to accelerations in the plate convergence rate. Between these settings, Phoenix-South American plate motion was almost parallel to the Fuegian trench. Here, magmatism in Paleocene to early Miocene times must be related to the presence of a slab subducted beneath the region by the less oblique collision further north. Later magmatism can be related to migration of the Phoenix-Farallon ridge and Phoenix-Farallon-Antarctic triple junction into the area south of the Fuegian margin, which brought it into slow low-obliquity convergence with first Farallon and then Antarctic plate lithosphere. © 2014 Elsevier B.V. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921280061&doi=10.1016%2fj.gloplacha.2014.08.002&partnerID=40&md5=43db674e355b7e3dac4d15b54e5a831c
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/11306
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| Appears in Collections: | 全球变化的国际研究计划
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作者单位: | Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven, Germany
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| Recommended Citation: | |
Eagles G.,Scott B.G.C.. Plate convergence west of Patagonia and the Antarctic Peninsula since 61Ma[J],2014-01-01,123.
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