Antarctica is renowned for its ancient cratons, difficult-to-observe sutures and active continental rifts. Detailed lithospheric structure and strength estimates are crucial for understanding the potential distribution, long-term geological evolution, and deformation patterns of this continent. The lithospheric structure of the Antarctic continent is investigated based on joint modeling of elevation and geoid data with the incorporation of seismic data and thermal constraints. Moreover, these results are used to infer the yield strength envelopes across Antarctica. The laterally variable lithospheric strength is finally generated by vertically integrating the above envelopes. Our results show that the variations in the depth of the lithosphere-asthenosphere boundary (LAB) are analogous to the variations in the integrated lithospheric strength; these parameters vary from 60 to 220 km and from 0.5 × 10¹³ Pa m to 4.5 × 10¹³ Pa m, respectively. Several regions of East Antarctica exhibit thick and strong lithospheric mantle, suggesting the presence of scattered cratonic blocks. In contrast, a thin and weak lithosphere is observed in the tectonically active West Antarctica and East Antarctic orogenic belts. Generally, our new LAB model correlates well with previous estimates, but there is a significant inconsistency beneath the Gamburtsev Subglacial Mountains, where a shallow LAB (∼120 km), high Moho temperature, and low strength (<1.0 × 10¹³ Pa m) are estimated. We speculate that this anomaly may be similar to the thinned lithosphere in Dronning Maud Land and reflects the removal of the mantle lithosphere during or after the orogenesis associated with the assembly of the Gondwana supercontinent.

中文翻译：

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来自高程、大地水准面和地震数据的联合建模的南极洲岩石圈结构和强度变化


南极洲以其古老的克拉通、难以观察的缝合线和活跃的大陆裂谷而闻名。详细的岩石圈结构和强度估计对于了解该大陆的潜在分布、长期地质演变和变形模式至关重要。南极大陆的岩石圈结构基于高程和大地水准面数据的联合建模，并结合了地震数据和热约束。此外，这些结果用于推断整个南极洲的屈服强度包络线。横向可变的岩石圈强度最终通过垂直整合上述包络线来产生。我们的结果表明，岩石圈-软流圈边界 （LAB） 深度的变化类似于综合岩石圈强度的变化;这些参数分别从 60 到 220 公里和 0.5 × 10¹³ Pa m 到 4.5 ×^{10 13} Pa m 不等。东南极洲的几个地区表现出厚而强的岩石圈地幔，表明存在分散的克拉通块。相比之下，在构造活跃的南极洲西部和南极东部造山带中观察到薄而弱的岩石圈。总的来说，我们的新 LAB 模型与以前的估计值具有良好的相关性，但在 Gamburtsev 冰下山脉下存在显着的不一致，其中估计的 LAB 较浅（∼120 公里）、莫霍温度高、强度低（x3C1.0 × 10¹³ Pa m）。我们推测，这种异常可能类似于 Dronning Maud Land 中变薄的岩石圈，反映了在与冈瓦纳超大陆组装相关的造山作用期间或之后地幔岩石圈的移除。