DOI: 10.1038/ngeo2904
论文题名: Record of modern-style plate tectonics in the Palaeoproterozoic Trans-Hudson orogen
作者: Weller O.M. ; St-Onge M.R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 4 起始页码: 305
结束页码: 311
语种: 英语
Scopus关键词: deformation
; eclogite
; facies
; Himalayan orogeny
; Hudsonian orogeny
; magmatism
; metamorphic rock
; monazite
; overprinting
; plate tectonics
; Proterozoic
; subduction
; Himalayas
; North America
英文摘要: The Trans-Hudson orogen of North America is a circa 1,800 million year old, middle Palaeoproterozoic continental collisional belt. The orogen may represent an ancient analogue to the Himalayan orogen, which began forming 50 million years ago and remains active today. Both mountain belts exhibit similar length scales of deformation and timescales of magmatism and metamorphism. A notable divergence in this correlation has been the absence of high-pressure, low-temperature metamorphic rocks in the Trans-Hudson compared with the Himalaya. It has been debated whether this absence reflects a secular tectonic change, with the requisite cool thermal gradients precluded by warmer ambient mantle temperatures during the Palaeoproterozoic, or a lack of preservation. Here we identify eclogite rocks within the Trans-Hudson orogen. These rocks, which typically form at high pressures and cool temperatures during subduction, fill the gap in the comparative geologic record between the Trans-Hudson and Himalayan orogens. Through the application of phase equilibria modelling and in situ U-Pb monazite dating we show that the pressure-temperature conditions and relative timing of eclogite-facies metamorphism are comparable in both orogenies. The results imply that modern-day plate tectonic processes featuring deep continental subduction occurred at least 1,830 million years ago. This study highlights that the global metamorphic rock record (particularly in older terrains) is skewed by overprinting and erosion. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105803
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Geological Survey of Canada, 601 Booth Street, Ottawa, ON, Canada; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, United Kingdom
Recommended Citation:
Weller O.M.,St-Onge M.R.. Record of modern-style plate tectonics in the Palaeoproterozoic Trans-Hudson orogen[J]. Nature Geoscience,2017-01-01,10(4)