globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2019.115975
论文题名:
A comparison between zircons from the Acasta Gneiss Complex and the Jack Hills region
作者: Reimink J.R.; Davies J.H.F.L.; Bauer A.M.; Chacko T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 531
语种: 英语
中文关键词: Acasta Gneiss Complex ; crustal evolution ; Hf-isotope ; Jack Hills ; trace elements ; zircon
英文关键词: Isotopes ; Melting ; Silicate minerals ; Trace elements ; Zircon deposits ; Continental crusts ; Crustal evolution ; Detrital zircon grains ; Gneiss complexes ; Hf isotope ; Jack hills ; Trace element composition ; Western Australia ; Zircon ; Acasta
英文摘要: The composition and origin of the earliest continental crust is intensely debated. The understanding of its composition relies heavily on the oldest vestiges of continental crust, which includes detrital zircon grains that are up to 4.36 billion-years-old (Ga) and <4.03 Ga zircon-bearing rocks. However, the interpretation of these two sample suites has thus far remained largely separate. Here, we demonstrate that the trace-element compositions of magmatic zircons from the Acasta Gneiss Complex compare favorably with those of ancient detrital zircons from western Australia. We combine these new data with existing oxygen and hafnium isotope datasets to show that the petrological processes that formed the Acasta Gneiss Complex, namely partial melting of mafic crust at various depths, are an appropriate analogue for the formation of the Hadean crust parental to the Jack Hills zircon grains. We also suggest that a transition from shallow-, to deep-crustal melting occurred in the JH source region ca. 3.8 Ga. © 2019 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165229
Appears in Collections:气候变化与战略

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作者单位: Department of Terrestrial Magnetism, Carnegie Institution for Science, Washington, DC 20015, United States; Department of Geosciences, The Pennsylvania State University, University Park, PA 16803, United States; Département des Sciences de la Terre et de l'Atmosphère, Université du Québec à Montréal, Montréal, QC H2X3Y7, Canada; Department of Geology and Geophysics, Yale University, New Haven, CT 06511, United States; Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, United States; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G2E3, Canada

Recommended Citation:
Reimink J.R.,Davies J.H.F.L.,Bauer A.M.,et al. A comparison between zircons from the Acasta Gneiss Complex and the Jack Hills region[J]. Earth and Planetary Science Letters,2020-01-01,531
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