Lithospheric Structure and Strength Variations in Antarctica From Joint Modeling of Elevation, Geoid and Seismic Data

IF 3.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Fei Ji, Mingju Xu, Qiao Zhang, Xiaochun Liu, Xin Zhou
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Abstract

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.

从高程、大地水准面和地震数据的联合建模看南极洲岩石圈结构和强度变化
南极洲以其古老的火山口、难以观测的缝合线和活跃的大陆裂缝而闻名于世。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。南极大陆岩石圈结构的研究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条件。此外,还利用这些结果推断了整个南极洲的屈服强度包络线。通过对上述包络线进行垂直整合,最终得出横向可变岩石圈强度。我们的结果表明,岩石圈-岩石圈边界(LAB)深度的变化与岩石圈综合强度的变化类似;这些参数的变化范围分别为 60 至 220 千米和 0.5 × 1013 Pa m 至 4.5 × 1013 Pa m。南极洲东部的几个区域显示出厚而强的岩石圈地幔,表明存在分散的板块。相反,在构造活跃的南极洲西部和南极洲东部造山带则观察到薄而弱的岩石圈。总体而言,我们的新岩石圈模型与之前的估计结果吻合,但在甘布尔采夫亚冰川山下存在明显的不一致性,那里的岩石圈较浅(∼120 km),莫霍温较高,强度较低(1.0 × 1013 Pa m)。我们推测,这种异常可能与德龙宁毛德地岩石圈变薄的情况类似,反映了冈瓦纳超大陆形成过程中或形成之后地幔岩石圈的移除。
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来源期刊
Journal of Geophysical Research: Solid Earth
Journal of Geophysical Research: Solid Earth Earth and Planetary Sciences-Geophysics
CiteScore
7.50
自引率
15.40%
发文量
559
期刊介绍: The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology. JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields. JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.
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