DOI: 10.1016/j.epsl.2020.116465
论文题名: Thermo-compositional structure of the north-eastern Canadian Shield from Rayleigh wave dispersion analysis as a record of its tectonic history
作者: Altoe I. ; Eeken T. ; Goes S. ; Foster A. ; Darbyshire F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 547 语种: 英语
中文关键词: geotherm
; Grenville
; lithosphere
; metasomatic alteration
; Mid-Continent Rift
; Superior Craton
英文关键词: Belts
; Cluster analysis
; Geodynamics
; Rayleigh waves
; Seismic waves
; Seismology
; Structural geology
; Compositional heterogeneity
; Compositional structure
; Geodynamic process
; Lateral variations
; Lithospheric temperatures
; Rayleigh-wave dispersion
; Seismic velocities
; Thermodynamic methods
; Dispersion (waves)
; cluster analysis
; craton
; crustal structure
; geodynamics
; numerical model
; Rayleigh wave
; tectonic evolution
; tectonic setting
; wave dispersion
; Canadian Shield
英文摘要: The thermal and compositional structure of lithospheric keels underlying cratons, which are stable continental cores formed during the Precambrian, is still an enigma. Mapping lithospheric temperatures and compositional heterogeneities is essential to better understand geodynamic processes that control craton formation and evolution. Here we investigate the northeastern part of North America which comprises the Superior Craton, the largest Archean craton in the world, and surrounding Proterozoic belts. We model Rayleigh-wave dispersion curves from a previous study, which were regionalised based on cluster analysis. Next, we perform a grid search for sub-crustal thermal and compositional structures that are consistent with the average dispersion curve for each cluster. We apply constraints on crustal structure and use thermodynamic methods to map thermo-compositional structures into seismic velocity. In agreement with previous studies, most regions require concentrations of metasomatic minerals over certain depth intervals to fit the seismic profiles. Our results further require vertical as well as lateral variations in compositional and thermal structures, which appear to reflect different stages of formation and modification of the lithosphere below the region, with distinct structures found under Archean cores, Archean/Paleoproterozoic collision belts, mid-late Proterozoic collision belts, and zones affected by rifting. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164848
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth Science and Engineering, Imperial College, London, United Kingdom; School of Earth Science Energy and Environment, Yachay Tech University, Urcuquí, Ecuador; Centre de recherche GEOTOP, Université du Québec à Montréal, Montreal, QC, Canada
Recommended Citation:
Altoe I.,Eeken T.,Goes S.,et al. Thermo-compositional structure of the north-eastern Canadian Shield from Rayleigh wave dispersion analysis as a record of its tectonic history[J]. Earth and Planetary Science Letters,2020-01-01,547