globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116925
论文题名:
Controls by rheological structure of the lithosphere on the temporal evolution of continental magmatism: Inferences from the Pannonian Basin system
作者: Koptev A.; Cloetingh S.; Kovács I.J.; Gerya T.; Ehlers T.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 565
语种: 英语
中文关键词: alkali basalts ; continental magmatism ; lithosphere rheology ; melting ; Pannonian Basin system ; thermo-kinematic modelling
英文关键词: Alkalinity ; Basalt ; Elasticity ; Geodynamics ; Kinematics ; Rheology ; Tectonics ; Viscosity ; Alkali basalt ; Basaltic melts ; Continental magmatism ; Crustals ; Lithosphere rheology ; Low viscosity ; Magmatisms ; Pannonian basin ; Pannonian basin system ; Thermo-kinematic modeling ; Melting ; alkali basalt ; continental lithosphere ; emplacement ; lithospheric structure ; magma ; magmatism ; melting ; rheology ; temporal evolution ; Pannonian Basin
英文摘要: Physical-chemical controls of continental magmatism evolution remain enigmatic. Of prime and controversial nature is the temporal transition from calc-alkaline magmas to alkali basalts, correlated with a switch in tectonic regime from extension to compression. We perform 1D thermo-kinematic modelling to analyze the evolution of the thermo-rheological structure of the lithosphere in such settings using the Northwestern Pannonian Basin as a test-bed. Given well-known evidence for major reduction of brittle deformation parameters due to melt-related softening, we use a relatively low internal angle of friction. We demonstrate that at the termination of extension, the presence of intra-crustal low-viscosity layers in the lithosphere provides optimal condition for emplacement and differentiation of intermediate crustal magmatic chambers along the pathway of deep-sourced basaltic melts. In contrast, subsequent lithosphere cooling after the end of extension combined with tectonic and magmatic thickening lead to a disappearance of the low-viscosity layers and formation of lithospheric-scale faults. The latter serve as conduits for rapid ascent of uncontaminated alkali basaltic melts from the mantle to the surface. These findings shed new light on the geodynamic controls of magmatism in extensional settings. © 2021 The Authors
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165549
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作者单位: University of Tübingen, Department of Geosciences, Tübingen, Germany; Utrecht University, Tectonics Research Group, Utrecht, Netherlands; MTA EK Lendület Pannon LitH2Oscope Research Group, Budapest, Hungary; CSFK Geodetic and Geophysical Institute, Sopron, Hungary; Centre for Energy Research, Institute for Energy Security and Environmental Safety, Budapest, Hungary; Institute of Geophysics, Department of Earth Sciences, ETH-Zurich, Zurich, Switzerland

Recommended Citation:
Koptev A.,Cloetingh S.,Kovács I.J.,et al. Controls by rheological structure of the lithosphere on the temporal evolution of continental magmatism: Inferences from the Pannonian Basin system[J]. Earth and Planetary Science Letters,2021-01-01,565
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