globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2020.228457
论文题名:
The bent prolongation of the 85°E Ridge south of 5°N – Fact or fiction?
作者: Altenbernd T.; Jokat W.; Geissler W.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 785
语种: 英语
中文关键词: 85°E ridge ; Bay of Bengal ; Gravity data ; Indian Ocean ; P-wave velocity model ; Refraction seismic data
英文关键词: Seismic waves ; Seismology ; Wave propagation ; Crustal structure ; Crustal thickenings ; Flexural basins ; Gravity anomalies ; Lithospheric deformation ; P-wave velocity ; Reflection seismic ; Refraction seismics ; Submarine geology ; crustal structure ; crustal thickening ; deformation ; gravity anomaly ; hot spot ; Indian plate ; mantle plume ; underplating ; volcanism ; Afanasy Nikitin Seamount ; Bay of Bengal ; Indian Ocean
英文摘要: The enigmatic 85°E Ridge crosses the Bay of Bengal from north to south. Its strong gravity anomaly low is associated with Cretaceous hotspot volcanism. South of 5°N, the gravity low bends into a SW-NE orientation and continues as far SW as the Afanasy Nikitin Seamounts. This change has been interpreted to represent a bent hotspot track. We report new constraints on the crustal structure and genesis beneath the SW-trending gravity low based on new refraction seismic, reflection seismic, and shipborne gravity data. Our findings show that the crustal structure across the gravity low does not differ significantly from the adjacent, 4.5 to 7 km thick oceanic crust. No basement ridge, significant crustal thickening, or magmatic underplating were identified. We found no evidence for a southern prolongation of the 85°E Ridge. Instead, our P-wave velocity and density models reveal the gravity low to express a flexural basin, which is a result of widespread mid-Miocene to recent lithospheric deformation in the Indian Ocean. The ~25 mGal negative gravity anomaly is therefore not related to the passage of the Indian plate over a mantle plume, casting doubt on the possibility that volcanism at the Afanasy Nikitin Seamounts might be related to the same plume as the northern 85°E Ridge. The northern 85°E Ridge may have been generated at the northern prolongation of the 86°E Fracture Zone. © 2020 Elsevier B.V.
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被引频次[WOS]:12   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170537
Appears in Collections:气候变化与战略

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作者单位: Alfred-Wegener-Institut für Polar-und Meeresforschung, Am Handelshafen 12, Bremerhaven, 27570, Germany

Recommended Citation:
Altenbernd T.,Jokat W.,Geissler W.. The bent prolongation of the 85°E Ridge south of 5°N – Fact or fiction?[J]. Tectonophysics,2020-01-01,785
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