globalchange  > 气候变化与战略
DOI: 10.1016/j.tecto.2021.228744
论文题名:
Structure of the crust and upper mantle beneath the Bransfield Strait (Antarctica) using P receiver functions
作者: Parera-Portell J.A.; Mancilla F.D.L.; Morales J.; Almendros J.; Jiménez-Morales V.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 802
语种: 英语
中文关键词: Antarctic Peninsula ; Bransfield Strait ; Crustal and lithospheric structure ; Receiver functions
英文关键词: Seismic waves ; Antarctic Peninsula ; Continental crusts ; Crustal thickness ; Low velocity zones ; Mantle transition zone ; Receiver functions ; Spatial variability ; Upper mantle structure ; Structural geology ; crustal thickness ; lithospheric structure ; Moho ; partial melting ; seismic wave ; upper mantle ; volcanism ; Antarctic Peninsula ; Antarctica ; West Antarctica ; Phoenix
英文摘要: The Bransfield Strait is a tectonically active back-arc rift basin located between the South Shetland archipelago (SSI) and the Antarctic Peninsula (AP). We use teleseismic P-wave receiver functions from twelve seismic stations in order to improve the current understanding of the crustal and upper mantle structure of the region. We calculate the thickness and average Vp/Vs ratio of the crust, the thickness of the Mantle Transition Zone (MTZ) and their spatial variability along the study area. Our analysis reveals a homogeneous crustal thickness in the AP, averaging 33.5 ± 1.2 km. The VP/VS ratio increases from east to west, with an average of 1.78 ± 0.04 typical of continental crust. In the SSI results are highly heterogeneous. The minimum crustal thickness is observed in Deception Island (~15 km), near the rift axis, while the crust thickens towards the edges of the basin to ~30 km. High crustal VP/VS ratios (>1.95) in the archipelago correlate with a shallow Moho and may be linked to the presence of melts in the crust, in accordance with the active volcanism in the region. We detected an underplating layer and the Moho of the Phoenix slab beneath the SSI. There is evidence of a low velocity zone (LVZ) in the mantle wedge under the SSI and also under the AP, suggesting there is widespread partial melting of the upper mantle. We infer that the Phoenix slab dips steeply, as we observe a thickened MTZ under the AP. © 2021 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170882
Appears in Collections:气候变化与战略

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作者单位: Instituto Andaluz de Geofísica, Universidad de Granada, Campus de Cartuja, c/Prof. Clavera n° 12, Granada, 18071, Spain; Departamento de F´ ısica Teórica y del Cosmos, Facultad de Ciencias, Universidad de Granada, Campus de Fuente Nueva, Granada, 18071, Spain

Recommended Citation:
Parera-Portell J.A.,Mancilla F.D.L.,Morales J.,et al. Structure of the crust and upper mantle beneath the Bransfield Strait (Antarctica) using P receiver functions[J]. Tectonophysics,2021-01-01,802
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