气候变化领域集成服务门户(CCPortal): Geodynamic Modeling of Lithospheric Removal and Surface Deformation: Application to Intraplate Uplift in Central Mongolia

CCPortal

DOI	10.1029/2020JB021304
	Geodynamic Modeling of Lithospheric Removal and Surface Deformation: Application to Intraplate Uplift in Central Mongolia
	Comeau M.J.; Stein C.; Becken M.; Hansen U.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Intraplate surface deformation is enigmatic and the underlying mechanisms responsible are not fully understood. We use thermo-mechanical numerical modeling to explore the conditions under which lithospheric removal processes can occur and investigate the timing and amplitude of consequent surface deformation. We allow lithospheric removal to develop dynamically and self-consistently by applying a phase transition and density jump that is hypothesized to be a consequence of metamorphic eclogitization in a thickened crust, rather than simply imposing an initial dense block. By systematically varying parameters, we test their influence and control on lithospheric removal. We confirm that a weak and dense lower crust, a hot crust-mantle boundary, and a convergent regime are critical requirements for delamination-style removal. We apply these results to central Mongolia, which is an ideal natural laboratory for studying intraplate surface uplift because of its high topography and location in the continental interior. We determine that the physical parameters and structure inferred in this region match the conditions for delamination. Thus, model outputs are evaluated against the available observational evidence. We find that the removal of the lithosphere by delamination can explain: the dome-shaped topographic pattern and elevated surface; the thin lithosphere and its structure; the elevated temperature at the crust-mantle boundary. Additionally, it is hypothesized that delamination leads to magmatism due to mantle decompression melting, consistent with intraplate volcanism. Ultimately, the results suggest that lithospheric removal by delamination is a physically plausible mechanism and a potential explanation for intraplate uplift. © 2021. The Authors.
英文关键词	delamination; Hangai Mongolia; intraplate uplift; lithosphere removal; Rayleigh-Taylor instability; thermo-mechanical numerical modeling
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187099
作者单位	Institut für Geophysik, Universität Münster, Münster, Germany
推荐引用方式 GB/T 7714	Comeau M.J.,Stein C.,Becken M.,et al. Geodynamic Modeling of Lithospheric Removal and Surface Deformation: Application to Intraplate Uplift in Central Mongolia[J],2021,126(5).
APA	Comeau M.J.,Stein C.,Becken M.,&Hansen U..(2021).Geodynamic Modeling of Lithospheric Removal and Surface Deformation: Application to Intraplate Uplift in Central Mongolia.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Comeau M.J.,et al."Geodynamic Modeling of Lithospheric Removal and Surface Deformation: Application to Intraplate Uplift in Central Mongolia".Journal of Geophysical Research: Solid Earth 126.5(2021).