Inland extent of the Weddell Sea Rift imaged by new aerogeophysical data

Inland extent of the Weddell Sea Rift imaged by new aerogeophysical data
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通过新的航空地球物理数据成像的威德尔裂谷的内陆范围

DOI:
10.1016/j.tecto.2012.09.010
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发表时间:
2013
期刊:
影响因子:
2.9
通讯作者:
Jordan T
Jordan T
中科院分区:
地球科学2区
文献类型:
--
作者:
Jordan T

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威德尔海裂谷是冈瓦纳分裂早期侏罗纪伸展和岩浆活动的主要焦点,位于威德尔海海湾之下,将东南极洲与西南极洲的地壳块体拼贴分开。在研究所和穆勒冰流集水区新收集的航空地球物理数据揭示了威德尔海裂谷对埃尔斯沃-惠特莫尔块的内陆范围,以及东南极洲和西南极洲之间迄今未知的主要左横向走滑边界。航磁和重力异常确定了元古代基底、中寒武世裂谷相关火山岩、侏罗纪侵入体和推断的后侏罗纪沉积岩的区域冰下范围。2D和3D磁源深度估计用于帮助约束该区域的联合磁和重力模型。模型显示,元古宙地壳类似于暴露在哈格冰原岛峰,延伸到沿海盆地边缘的埃尔斯沃思山脉东南部。厚花岗质侏罗纪侵入体被模拟在埃尔斯沃-惠特莫尔块体和威德尔海裂谷的较薄地壳之间的过渡处,并位于帕加诺剪切带内。威德尔海裂谷内陆延伸部分下方的地壳被模拟为比相邻的埃尔斯沃-惠特莫尔块体薄约4公里,或者被厚达8公里的镁铁质底板覆盖。
The Weddell Sea Rift was a major focus for Jurassic extension and magmatism during the early stages of Gondwana break-up and underlies the Weddell Sea Embayment, which separates East Antarctica from a collage of crustal blocks in West Antarctica. Newly-collected aerogeophysical data over the catchments of Institute and Möller ice streams reveal the inland extent of the Weddell Sea Rift against the Ellsworth-Whitmore block and a hitherto unknown major left-lateral strike slip boundary between East and West Antarctica. Aeromagnetic and gravity anomalies define the regional subglacial extent of Proterozoic basement, Middle Cambrian rift-related volcanic rocks, Jurassic intrusions and sedimentary rocks of inferred post-Jurassic age. 2D and 3D magnetic depth-to-source estimates were used to help constrain joint magnetic and gravity models for the region. The models reveal that Proterozoic crust similar to that exposed at Haag Nunataks, extends southeast of the Ellsworth Mountains to the margin of the Coastal Basins. Thick granitic Jurassic intrusions are modelled at the transition between the Ellsworth-Whitmore block and the thinner crust of the Weddell Sea Rift and within the Pagano Shear Zone. The crust beneath the inland extension of the Weddell Sea Rift is modelled as being either ~4km thinner compared to the adjacent Ellsworth-Whitmore block or as underlain by an up to 8km thick mafic underplate.
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