Variations of the effective elastic thickness reveal tectonic fragmentation of the Antarctic lithosphere
Variations of the effective elastic thickness reveal tectonic fragmentation of the Antarctic lithosphere
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有效弹性厚度的变化揭示了南极岩石圈的构造破碎
DOI：
10.1016/j.tecto.2017.06.012
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发表时间：
2017-06
期刊：
影响因子：
2.9
通讯作者：
Alexey G. Petrunin
中科院分区：
文献类型：
--
作者：
Bo Chen;Carina Haeger;Mikhail K. Kaban;Alexey G. Petrunin
到目前为止，人们对南极岩石圈的热和流变学性质知之甚少。我们推导出的有效弹性厚度Teas代理这些参数，通过使用冰的厚度，基岩地形和新的卫星和高分辨率的地面重力数据相结合。基于扇形小波技术的互谱分析，通过导纳和相干技术计算Tvariations。我们的研究结果证实了南极洲的一个明确的构造分区，主要是高值在东南极洲（EANT）（Te~ 60-80 km）和低值在西南极洲（WANT）（Te~ 5-20 km）。对于这些省份之间的横贯山脉，我们发现特多沿着整个链条沿着大约10公里，这与WANT相当。除了这种一般的划分，我们发现这些省的岩石圈的破碎。特别是EANT不代表一个单一的岩石圈块体，但显示出强烈的变化Te。最高值出现在极光冰下盆地周围（Te~ 90 km）和德龙宁毛德地（Te~ 80 km）。EANT内Te 2的最小值（~ 15 km）出现在Lambert地堑。如此低的值可能与二叠纪-三叠纪的活跃裂谷作用、强烈的局部侵蚀或新生代地幔柱的影响有关。根据相干计算，弱带延伸到Gamburtsev冰下山脉（GSM），显示出特多25-30公里的明显减少。因此，这个弱通道划分了前面提到的强块。然而，对于GSM，导纳分析给出了相对高的值（Te~ 70 km）。基于对波长依赖的导纳和相干结果以及几个主要位置的失配的分析，我们对基于相干的值给予了一些偏好。
To this day, little is known about thermal and rheological properties of the Antarctic lithosphere. We derive the effective elastic thickness Teas a proxy for these parameters by using ice thickness, bedrock topography and a combination of new satellite and high resolution terrestrial gravity data. Cross-spectral analysis based on the fan wavelet technique was employed to calculate Tevariations by means of admittance and coherence techniques. Our results confirm a clear tectonic division of Antarctica with predominantly high values in East Antarctica (EANT) (Te~ 60–80 km) and low values in West Antarctica (WANT) (Te~ 5–20 km). For the Transantarctic Mountains separating these provinces, we found Teto be around 10 km along the whole chain which is comparable to WANT. Apart from this general division, we found fragmentation of the lithosphere within these provinces. Especially EANT doesn't represent a single lithospheric block but shows strong variations of Te. The highest values are found around the Aurora Subglacial Basin (Te~ 90 km) and in Dronning Maud Land (Te~ 80 km). The minimum value of Tewithin EANT (~ 15 km) is found in the Lambert Graben. Such a low value can be associated with active rifting in the Permian-Triassic, strong localized erosion or possibly the effect of a Cenozoic mantle plume. According to the coherence calculations, the weak zone extends to the Gamburtsev Subglacial Mountains (GSM), showing a distinct decrease of Teto 25–30 km. Thus, this weak channel divides the previously mentioned strong blocks. However, the admittance analysis gives relatively high values (Te~ 70 km) for the GSM. Based on the analysis of the wavelength-dependent admittance and coherence results and misfits for several principal locations, we give some preference to the coherence based values.
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影响因子：
2.8
作者：
R. Banks;R. Parker;S. Huestis
通讯作者：
R. Banks;R. Parker;S. Huestis
影响因子：
3.7
作者：
M. Tesauro;P. Audet;M. Kaban;S. Cloetingh
通讯作者：
M. Tesauro;P. Audet;M. Kaban;S. Cloetingh
影响因子：
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作者：
M. Lythe;D. Vaughan
通讯作者：
M. Lythe;D. Vaughan
DOI：
10.1017/9781139027748
发表时间：
2001-10
期刊：
--
影响因子：
--
作者：
A. Watts
通讯作者：
A. Watts
影响因子：
64.8
作者：
Ferraccioli, Fausto;Finn, Carol A.;Damaske, Detlef
通讯作者：
Damaske, Detlef