The subglacial geology of Wilkes Land, East Antarctica
The subglacial geology of Wilkes Land, East Antarctica
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DOI：
10.1002/2014gl059405
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发表时间：
2014-04-16
影响因子：
5.2
通讯作者：
Siegert, M. J.
中科院分区：
文献类型：
--
作者：
Aitken, A. R. A.;Young, D. A.;Siegert, M. J.
威尔克斯地是研究冈瓦纳大陆构造以及了解构造边界条件对东南极冰盖（EAIS）行为影响的关键区域。尽管它很重要，但这里仍然是地球上我们对其地质情况缺乏基本了解的最大区域之一。新的磁力、重力和冰下地形数据使我们能够对该地区进行首次全面的地质解释。我们绘制了岩石圈区域及其边界断层图，包括印度 - 南极洲和澳大利亚 - 南极洲之间的缝合带。此外，我们绘制了冰下沉积盆地的图像，包括奥罗拉和诺克斯冰下盆地以及之前未知的塞布丽娜冰下盆地。磁力、重力和地形数据在结构上的共性表明，东南极冰盖形成前的构造特征是对冰下地形的主要控制因素。冰川作用后这种关系的保留表明，这些构造特征提供了地形和基底边界条件，对东南极冰盖的结构和演化产生了重大影响。
Wilkes Land is a key region for studying the configuration of Gondwana and for appreciating the role of tectonic boundary conditions on East Antarctic Ice Sheet (EAIS) behavior. Despite this importance, it remains one of the largest regions on Earth where we lack a basic knowledge of geology. New magnetic, gravity, and subglacial topography data allow the region's first comprehensive geological interpretation. We map lithospheric domains and their bounding faults, including the suture between Indo-Antarctica and Australo-Antarctica. Furthermore, we image subglacial sedimentary basins, including the Aurora and Knox Subglacial Basins and the previously unknown Sabrina Subglacial Basin. Commonality of structure in magnetic, gravity, and topography data suggest that pre-EAIS tectonic features are a primary control on subglacial topography. The preservation of this relationship after glaciation suggests that these tectonic features provide topographic and basal boundary conditions that have strongly influenced the structure and evolution of the EAIS.