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首页> 外文期刊>Journal of Asian earth sciences >Zr-in-rutile thermometry of eclogite in the Dabie orogen: Constraints on rutile growth during continental subduction-zone metamorphism
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Zr-in-rutile thermometry of eclogite in the Dabie orogen: Constraints on rutile growth during continental subduction-zone metamorphism

机译：大别造山带榴辉岩中锆石的金红石型体温计：大陆俯冲带变质中金红石生长的限制

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摘要

The Zr content of rutile was analysed by both EMP and LA-ICPMS for low-T/UHP eclogite and enclosed kyanite-quartz veins in the Dabie orogen, China. Zr-in-rutile temperatures were calculated at different pressures and then compared with temperatures derived from Ti-in-zircon, mineral-reaction, quartz-mineral O-isotope and gamet-clinopyroxene Fe-Mg exchange thermometers. All thermometric data are interpreted within the framework of petrologically and geochronologically constrained P-T-t path. As a consequence, variable Zr-in-rutile temperatures for different occurrences of rutiles are used to indicate their growth in different stages during continental subduction-zone metamorphism. Thus, some rutiles would grow at the peak pressure, whereas other rutiles would either grow before the peak pressure during the subduction or grow at or after the peak temperature during exhumation. The mineral 0-isotope and Fe-Mg exchange thermometers also yield variably lower temperatures for the eclogite. The similar results were obtained for mid-T/UHP eclogites in the Dabie-Sulu orogenic belt. This is ascribed to the characteristic P-T-t path of UHP metamorphic rocks, in which metamorphic temperatures at peak pressures are lower than the peak temperatures at decreased pressures during exhumation. Thus, there is a contest between thermodynamics and kinetics during metamorphic reactions in response to P-T changes. Therefore, the reasonable interpretation of thermometric data requires comprehensive understanding of thermometric methodology from physicochemical principles to geological applicabilities.
机译：利用大功率造山带的低T / UHP榴辉岩和封闭的蓝晶石-石英脉管，通过EMP和LA-ICPMS分析了金红石的Zr含量。在不同压力下计算出金红石中的Zr温度，然后将其与源自锆石中的Ti，矿物反应，石英-矿物O同位素和配子-斜茂铁Fe-Mg交换温度计的温度进行比较。所有的测温数据都在岩石学和年代学上受约束的P-T-t路径的框架内进行解释。结果，在大陆俯冲带变质过程中，金红石在不同金红石温度下的不同发生率被用来指示它们在不同阶段的生长。因此，一些金红石将在峰值压力下生长，而其他金红石将在俯冲过程中在峰值压力之前生长，或者在掘尸期间在峰值温度或之后生长。矿物0同位素和Fe-Mg交换温度计也为榴辉石产生了较低的温度。大别苏鲁造山带中段T / UHP榴辉岩获得了相似的结果。这归因于UHP变质岩的特征性P-T-t路径，其中在挖掘过程中，峰值压力下的变质温度低于减压下的峰值温度。因此，在响应P-T变化的变质反应过程中，热力学和动力学之间存在竞争。因此，对测温数据的合理解释需要对从物理化学原理到地质适用性的测温方法的全面理解。

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  • 来源
    《Journal of Asian earth sciences》 |2011年第2期|p.427-451|共25页
  • 作者

    Yong-Fei Zheng; Xiao-Ying Gao; Ren-Xu Chen; Tianshan Gao;

  • 作者单位

    CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;

    CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China,State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Ceosciences, Wuhan 430074, China;

    CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;

    CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China,State Key Laboratory for Mineral Deposits, School of Earth Science and Engineering, Nanjing University, Nanjing 210093, China;

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  • 正文语种 eng
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  • 关键词

    eclogite; rutile; zircon; mineral growth time; metamorphic geothermometry; continental collision; subduction zone;

    机译：榴辉岩;金红石;锆石;矿物生长时间;变质地热法;陆相碰撞;俯冲带;

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