globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2019.115908
论文题名:
Concordant pulse in Mn, Y and HREEs concentrations during UHP eclogitic garnet growth: Transient rock dynamics along a cold subduction plate interface
作者: Tan Z.; Agard P.; Gao J.; Hong T.; Wan B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 530
语种: 英语
中文关键词: Chinese SW-Tianshan ; cold subduction regime ; diffusion modeling ; garnet zoning ; UHP oceanic eclogite ; Zr-in-rutile thermometry
英文关键词: Diffusion ; Garnets ; Oxide minerals ; Temperature ; Thermometers ; Titanium dioxide ; Zirconium compounds ; Zoning ; Cold subduction ; Diffusion model ; Eclogites ; Garnet zoning ; Tianshan ; Manganese compounds ; concentration (composition) ; Devonian-Carboniferous boundary ; eclogite ; garnet ; plate motion ; plate tectonics ; rare earth element ; subduction ; thermometry ; zircon ; Tien Shan
英文摘要: We herein report strikingly concordant Mn, Y, and HREE garnet zoning in ultrahigh-pressure low-temperature oceanic eclogites found in the fossil Devonian-Carboniferous subduction plate interface in SW-Tianshan. Zr-in-rutile thermometry, thermodynamic modeling and diffusion-controlled garnet growth modeling show that this type of zoning can be explained by a short-lived transient, most likely a ∼80 °C thermal pulse (from 490 to 570 °C). This event could be as transient as ∼300 Ka, assuming a prograde to peak burial duration of 5 Ma. Such garnet zoning is observed for grains sampled meters apart (Fig. 1d) and was detected in other eclogites in the region. This transient event could reflect the short-lived movement of UHP oceanic slices, once detached, towards the hotter mantle wedge, and/or deformation-induced remobilization of fluids enhancing diffusion-controlled garnet growth. © 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/165303
Appears in Collections:气候变化与战略

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作者单位: State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre de Paris, ISTeP UMR 7193, Paris, F-75005, France; Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

Recommended Citation:
Tan Z.,Agard P.,Gao J.,et al. Concordant pulse in Mn, Y and HREEs concentrations during UHP eclogitic garnet growth: Transient rock dynamics along a cold subduction plate interface[J]. Earth and Planetary Science Letters,2020-01-01,530
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