TY - JOUR
T1 - A comparison between zircons from the Acasta Gneiss Complex and the Jack Hills region
AU - Reimink, Jesse R.
AU - Davies, Joshua H.F.L.
AU - Bauer, Ann M.
AU - Chacko, Thomas
N1 - Funding Information:
The authors acknowledge the late Erik Hauri for his expert aid during operation, analysis, and data reduction on the Cameca 6f ion microprobe at the Carnegie Institution of Washington. JRR acknowledges funding from the Carnegie Fellowship Fund, while samples were collected with funds from an NSERC Discovery grant to TC during the JRR's PhD project. Drs. Michael Ackerson and Jonathan Tucker are thanked for fruitful discussions during the preparation of this manuscript. Drs. Elizabeth Bell and Andreas Petersson are thanked for insightful reviews that improved the manuscript.
Funding Information:
The authors acknowledge the late Erik Hauri for his expert aid during operation, analysis, and data reduction on the Cameca 6f ion microprobe at the Carnegie Institution of Washington. JRR acknowledges funding from the Carnegie Fellowship Fund , while samples were collected with funds from an NSERC Discovery grant to TC during the JRR's PhD project. Drs. Michael Ackerson and Jonathan Tucker are thanked for fruitful discussions during the preparation of this manuscript. Drs. Elizabeth Bell and Andreas Petersson are thanked for insightful reviews that improved the manuscript. Appendix A
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/2/1
Y1 - 2020/2/1
N2 - 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.
AB - 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.
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U2 - 10.1016/j.epsl.2019.115975
DO - 10.1016/j.epsl.2019.115975
M3 - Article
AN - SCOPUS:85076253834
VL - 531
JO - Earth and Planetary Science Letters
JF - Earth and Planetary Science Letters
SN - 0012-821X
M1 - 115975
ER -