DOI: 10.1016/j.epsl.2019.116005
论文题名: A zircon petrochronologic view on granitoids and continental evolution
作者: Balica C. ; Ducea M.N. ; Gehrels G.E. ; Kirk J. ; Roban R.D. ; Luffi P. ; Chapman J.B. ; Triantafyllou A. ; Guo J. ; Stoica A.M. ; Ruiz J. ; Balintoni I. ; Profeta L. ; Hoffman D. ; Petrescu L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 531 语种: 英语
英文关键词: continental crust
; crustal evolution
; detrital zircon
; geochronology
; trace element chemistry
Scopus关键词: 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
; continental crust
; crustal evolution
; geochronology
; granitoid
; magma
; subduction zone
; trace element
; zircon
英文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159783
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Faculty of Biology and Geology, Babes-Bolyai University, Cluj Napoca, Romania; University of Arizona, Department of Geosciences, Tucson, AZ, United States; Faculty of Geology and Geophysics, University of Bucharest, Bucharest, Romania; Geodynamics Institute of the Romanian Academy, Bucharest, Romania; Department of Geology and Geophysics, University of Wyoming, Laramie, WY, United States; State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, China; Department of Geology, University of Liège, Sart Tilman, Liège, Belgium; Geological Institute of Romania, Bucharest, Romania
Recommended Citation:
Balica C.,Ducea M.N.,Gehrels G.E.,et al. A zircon petrochronologic view on granitoids and continental evolution[J]. Earth and Planetary Science Letters,2020-01-01,531