DOI: 10.1016/j.tecto.2020.228701
论文题名: Precambrian lithosphere beneath Hudson Bay: A new geological model based on the Hudson Bay Lithospheric Experiment (HuBLE), Canadian Shield
作者: Mints M.V. ; Dokukina K.A. ; Afonina T.B.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 799 语种: 英语
中文关键词: Archaean
; HuBLE
; Hudson Bay
; Lithospheric keel
; Mantle-plume model
; North America
; Proterozoic
; Sedimentary basin
; Subcontinental lithosphere
; Surface wave tomography
英文关键词: Sedimentology
; Seismology
; Geological interpretation
; Geological structures
; Lithospheric process
; North American cratons
; Sedimentary fillings
; Sedimentary sequence
; Sub-continental lithospheric mantles
; Thermomechanical model
; Igneous rocks
; data interpretation
; lithospheric structure
; mantle plume
; passive margin
; Precambrian
; seismic tomography
; surface wave
; Canada
; Canadian Shield
; Hudson Bay
英文摘要: The oval-shaped basin of Hudson Bay occurs near the center of the round-oval Archaean crustal domain of the North American continent. This paper presents models of the geological structure and evolution of the subcontinental lithospheric mantle underlying Hudson Bay and surrounding tectonic provinces based on geological interpretations of regional geological and geophysical data and results of seismic tomography investigations that have been conducted under the Hudson Bay Lithospheric Experiment. The experiment was aimed at lithospheric processes directly related to the origin of the North American craton and the Hudson Bay basin. Hudson Bay is located directly above the lithospheric keel of North America. The geological history demonstrates systematic “renovation” of the basin: (1) origin and evolution of the Neoarchaean Lake Minto basin (~2.75 Ga); (2) accumulation of the Palaeoproterozoic volcanic–sedimentary filling of the epicontinental basin, relics of which is preserved on its passive margins (2.03–1.87 Ga); (3) origin of Ordovician–Late Devonian sedimentary sequence whose maximum thickness reaches 2.5 km; and (4) the development of Late Jurassic–Miocene sediment-filled ring-shaped trough immediately above the lithospheric keel. The Hudson Bay basin occurs above the lithospheric keel in compliance with thermomechanical model of ascending plume. Tomography studies have not detected evidence of either production or transformation of the lithosphere in the Palaeoproterozoic, which are implied by the model of the United Plates of America. Interpretations of tomography data reveal a vertical axial zone in the lithosphere beneath Hudson Bay, which extends from the lithosphere–asthenosphere boundary to the base of the crust or, perhaps, even to the present day surface. The zone is made up of relatively light low-velocity igneous rocks, probably a swarm of kimberlite dikes or pipes. At 2.75 Ga, the North American continent was a single continental mass with Hudson Bay at its center. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170862
Appears in Collections: 气候变化与战略
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作者单位: Geological Institute, Russian Academy of Sciences, Moscow, Russian Federation
Recommended Citation:
Mints M.V.,Dokukina K.A.,Afonina T.B.. Precambrian lithosphere beneath Hudson Bay: A new geological model based on the Hudson Bay Lithospheric Experiment (HuBLE), Canadian Shield[J]. Tectonophysics,2021-01-01,799