DOI: 10.1016/j.epsl.2020.116654
论文题名: Global zircon analysis records a gradual rise of continental crust throughout the Neoarchean
作者: Reimink J.R. ; Davies J.H.F.L. ; Ielpi A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 554 语种: 英语
中文关键词: Archean Earth
; continental crust
; continental emergence
; continental freeboard
; detrital zircon
英文关键词: Atmospheric chemistry
; Distributed database systems
; Sea level
; Silicate minerals
; Age distribution
; Continental crusts
; Crustal recycling
; Detrital zircon
; Earth surface process
; Geochemical proxies
; Secular changes
; Sedimentary systems
; Zircon
; Archean
; bioavailability
; continental crust
; crustal evolution
; crustal recycling
; crustal structure
; detrital deposit
; hypothesis testing
; plate tectonics
; zircon
英文摘要: Determining when continental masses emerged above the global ocean is crucial to understanding secular changes in crustal and Earth-surface processes. The emergence of continents above sea level provided important sinks for atmospheric CO2, a source of bioavailable P2O5, and initiated the erosional component of the rock cycle. Previous estimates for continental emergence vary widely and depend on complex geochemical proxies. Here, we formulate a testable hypothesis for the behavior of sedimentary systems in a world with flooded vs. emergent continents and employ a simple sample-based analysis of the global detrital-zircon record. Our analysis filters the total detrital zircon database from >600,000 analyses to ∼450,000 analyses, then calculates age distribution metrics for each rock sample containing >40 individual zircon analyses. We show that watersheds with inferred sizes, relative to their host continents, similar to modern ones became common ∼2.8 billion years ago, and that consistent crustal recycling occurred at least since the Neoarchean. In light of the extant geologic record, this analysis suggests that widespread continental emergence began at the end of the Mesoarchean and progressed throughout the Neoarchean. Our analysis therefore provides a novel chronometer to track the emergence of continental-crust throughout Earth's history. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165641
Appears in Collections: 气候变化与战略
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作者单位: Department of Geosciences, The Pennsylvania State University, University Park, PA, United States; Département des sciences de la Terre et de l'atmosphère, Université du Québec à Montréal, Montreal, QC, Canada; Harquail School of Earth Sciences, Laurentian University, Sudbury, ON P3E 2C6, Canada; School of the Environment, Laurentian University, Sudbury, ON P3E 2C6, Canada
Recommended Citation:
Reimink J.R.,Davies J.H.F.L.,Ielpi A.. Global zircon analysis records a gradual rise of continental crust throughout the Neoarchean[J]. Earth and Planetary Science Letters,2021-01-01,554