Article (Scientific journals)
A zircon petrochronologic view on granitoids and continental evolution
Balica, C.; Ducea, M. N.; Gehrels, G. E. et al.
2020In Earth and Planetary Science Letters, 531 (February), p. 116005
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Keywords :
Binary alloys; Feldspar; Gallium; Geochronology; Igneous rocks; Lead alloys; Reservoirs (water); Structural geology; Thermometers; Trace elements; Uranium alloys; Continental crusts; Crustal evolution; Crustal thickness; Detrital zircon; Element chemistry; Magmatic temperatures; Metasedimentary rocks; Trace element geochemistry; Zircon
Abstract :
[en] Temporal trends in granitoid chemistry and thermometry constrain major global changes in magmatism, tectonism or crustal thickness in the continents. Our study relies on zircon geochronology and trace element geochemistry on four new detrital rocks (two modern sediments and two Archean metasedimentary rocks) and a global compilation of published single zircon detrital chronology and trace chemistry data acquired on 5587 individual grains. Zircons of all ages from 4.4 Ga to present exist in this archive. Ti-in-zircon thermometry indicates that more than 98% of the grains with concordant U-Pb ages formed at temperatures exceeding 650 °C. The great majority of these zircons formed in the 650–850 °C range consistent with growth in intermediate to silicic magmas. Magmatic temperatures increased over time for the first 1.2 Ga of Earth's history after which they stayed constant before decreasing during the more recent past. U/Th<5 values in the overwhelming majority of grains are consistent with a magmatic origin. La/Yb, Sm/Yb and Eu/Eu* values are relatively constant throughout the history of the Earth suggesting that most granitoids formed at, or evolved from magmatic reservoirs located at depths of 35–45 km in the presence of amphibole, garnet and limited plagioclase. Such reservoirs are common today in hot deep crustal environments beneath some of the thicker island arcs and all continental arcs along subduction zones. Processes other than modern day style subduction may have contributed to the formation of granitoids in the early Earth but temperatures, depths and the presence of water arbitrated by the presence of amphibole were similar. These results also suggest that the thickness of continental crust in areas that produced granitoids was similar to today's global average throughout the 4.4 Ga time period covered by the zircon archive. There is no correlation between zircon chemistry over time and the assembly of supercontinents. © 2019 Elsevier B.V.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Balica, C.;  Faculty of Biology and Geology, Babes-Bolyai University, Cluj Napoca, Romania
Ducea, M. N.;  University of Arizona, Department of Geosciences, Tucson, AZ, United States, Faculty of Geology and Geophysics, University of Bucharest, Bucharest, Romania
Gehrels, G. E.;  University of Arizona, Department of Geosciences, Tucson, AZ, United States
Kirk, J.;  University of Arizona, Department of Geosciences, Tucson, AZ, United States
Roban, R. D.;  Faculty of Geology and Geophysics, University of Bucharest, Bucharest, Romania
Luffi, P.;  Geodynamics Institute of the Romanian Academy, Bucharest, Romania, Geological Institute of Romania, Bucharest, Romania
Chapman, J. B.;  Department of Geology and Geophysics, University of Wyoming, Laramie, WY, United States
Triantafyllou, Antoine ;  Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Guo, J.;  State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, China
Stoica, A. M.;  University of Arizona, Department of Geosciences, Tucson, AZ, United States
Ruiz, J.;  University of Arizona, Department of Geosciences, Tucson, AZ, United States
Balintoni, I.;  Faculty of Biology and Geology, Babes-Bolyai University, Cluj Napoca, Romania
Profeta, L.;  University of Arizona, Department of Geosciences, Tucson, AZ, United States
Hoffman, D.;  University of Arizona, Department of Geosciences, Tucson, AZ, United States
Petrescu, L.;  Faculty of Geology and Geophysics, University of Bucharest, Bucharest, Romania
More authors (5 more) Less
Language :
English
Title :
A zircon petrochronologic view on granitoids and continental evolution
Publication date :
2020
Journal title :
Earth and Planetary Science Letters
ISSN :
0012-821X
eISSN :
1385-013X
Publisher :
Elsevier, Netherlands
Volume :
531
Issue :
February
Pages :
116005
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
PN-III-P4-ID-PCCF-2016-0014EAR 1725002
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