DOI: 10.1016/j.epsl.2021.117069
论文题名: Detrital rutile tracks the first appearance of subduction zone low T/P paired metamorphism in the Palaeoproterozoic
作者: Pereira I. ; Storey C.D. ; Darling J.R. ; Moreira H. ; Strachan R.A. ; Cawood P.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 570 语种: 英语
中文关键词: detrital rutile
; low T/P metamorphism
; metamorphic proxy
; paired metamorphism
; Palaeoproterozoic
; plate tectonics
英文关键词: Earth (planet)
; Metamorphic rocks
; Oxide minerals
; Tectonics
; Zircon
; Archaean
; Condition
; Detrital rutile
; Fully operational
; Low T/P metamorphism
; Metamorphic proxy
; Paired metamorphism
; Palaeoproterozoic
; Rock records
; Subduction zones
; Titanium dioxide
; detrital deposit
; metamorphism
; P-T conditions
; plate tectonics
; Proterozoic
; rutile
; subduction zone
英文摘要: Earth is unique in the Solar System as the only planet characterised by an active plate tectonic regime. However, there is still no consensus on whether this was fully operational in the Archaean or if it did not develop until the Proterozoic. The metamorphic record offers valuable insight into this debate, since paired, high and low T/P metamorphic conditions are a hallmark of modern plate tectonics. However, much of the metamorphic rock record has either been eroded or overprinted by subsequent tectonothermal events. To address this issue, we examine the detrital rock record and evaluate the potential of rutile, a mineral that forms during subduction and deep-crustal metamorphic processes, as a proxy to track the existence of low T/P and paired metamorphism. At temperatures of 550°C, rutile is mostly stable at pressures higher than ca. 13 kbar. We use this relationship and the Zr-in-rutile thermometer to determine peak metamorphic temperatures of detrital rutile grains to track the temporal distribution of low T/P metamorphism. We have compiled a dataset of detrital metamorphic rutile from Archaean to Permian age to trace the occurrence of low and high T/P metamorphism through time. The earliest evidence of low T/P from detrital rutile is at about 2.1 Ga. This agrees with the earliest evidence of eclogite facies conditions from the rock record and it also implies that these conditions must have been more prevalent than the present rock record seems to indicate. Together, our study confirms that subduction zone low T/P metamorphism has been fully operating since at least the late Palaeoproterozoic. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165628
Appears in Collections: 气候变化与战略
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作者单位: Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, Clermont-Ferrand, F-63000, France; School of the Environment, Geography and Geosciences, University of Portsmouth, Portsmouth, Hampshire PO1 3QL, United Kingdom; Géosciences Montpellier CNRS, Université de Montpellier, Montpellier, 34090, France; School of Earth, Atmosphere and Environment, Monash University, Wellington Rd, Clayton, VIC 3800, Australia
Recommended Citation:
Pereira I.,Storey C.D.,Darling J.R.,et al. Detrital rutile tracks the first appearance of subduction zone low T/P paired metamorphism in the Palaeoproterozoic[J]. Earth and Planetary Science Letters,2021-01-01,570