globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.116763
论文题名:
Hidden intact coesite in deeply subducted rocks
作者: Taguchi T.; Kouketsu Y.; Igami Y.; Kobayashi T.; Miyake A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 558
语种: 英语
中文关键词: coesite ; phase transition ; quartz pseudomorph ; Raman spectroscopy ; transmission electron microscopy
英文关键词: Garnets ; Geology ; Nanotechnology ; Quartz ; Diagnostic indicators ; Geological process ; Integrated approach ; Knowledge gaps ; Subduction zones ; Typical structures ; Ultra-high pressure metamorphisms ; Ultra-high-pressure metamorphic rocks ; Metamorphic rocks ; coesite ; numerical model ; phase transition ; pseudomorph ; quartz ; Raman spectroscopy ; subduction ; transmission electron microscopy ; ultrahigh pressure metamorphism ; Alps ; Italy ; Western Alps ; Indicator indicator
英文摘要: The stabilization of coesite is a diagnostic indicator of ultrahigh-pressure metamorphism and in many cases it implies that a rock has been subducted to a minimum depth of 80 km. Coesite typically occurs as rare relicts in rigid host minerals, but most commonly transforms into α-quartz pseudomorphs during exhumation. The abundance of coesite-bearing rocks in orogens worldwide is a contentious issue in the petrological community, despite evidence from numerical modeling that suggests that coesite formation should be a common geological process during ultrahigh-pressure metamorphism. This knowledge gap must be addressed to improve the understanding of the geological aspects of subduction-zone geodynamics. Here we report that minuscule coesites (<20 μm) occur as abundant inclusions in garnet-rich layers from the Italian Western Alps. The discovery of such intact inclusions may fill the gaps in the predicted and observed abundances of coesite worldwide. Through integrated approaches with resolutions down to the nano-scale, we show that these garnet-hosted inclusions are composed entirely of coesite. Our results suggest that common coesite-derived quartz pseudomorphs are less typical structures in ultrahigh-pressure metamorphic rocks and the minuscule coesite in many rocks may be overlooked because of its size. These findings open up new research directions for constraining the extent of deeply subducted rocks and their rheology. © 2021 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/165681
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作者单位: Department of Geology and Mineralogy, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan; Department of Earth Sciences, Faculty of Education and Integrated Arts and Sciences, Waseda University, Tokyo, 169-8050, Japan; Department of Earth and Planetary Science, Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8601, Japan; Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, 464-8601, Japan; Faculty of Health and Sports, Nagoya Gakuin University, Aichi, 480-1298, Japan

Recommended Citation:
Taguchi T.,Kouketsu Y.,Igami Y.,et al. Hidden intact coesite in deeply subducted rocks[J]. Earth and Planetary Science Letters,2021-01-01,558
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