| 金红石Zr和锆石Ti含量地质温度计 |
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| 引用本文： | 高晓英,郑永飞.金红石Zr和锆石Ti含量地质温度计[J].岩石学报,2011,27(2):417-432. |
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| 作者姓名： | 高晓英 郑永飞 |
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| 作者单位： | 中国科学院壳幔物质与环境重点实验室,中国科学技术大学地球和空间科学学院,合肥,230026 |
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| 基金项目： | 本文受国家自然科学基金项目(40903015、40921002)、中国博士后科学基金(20090450803)和教育部留学回国人员科研启动基金联合资助. |
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| 摘 要： | 作为近年来新提出的两种单矿物微量元素温度计(金红石Zr含量温度计和锆石Ti含量温度计),由于其简单实用,一经提出便引起了广泛注意,许多研究者尝试将温度计应用于各种不同类型的岩石中。到目前为止每种温度计都存在几个不同的计算公式、这些公式的适用范围和适用的地质情况目前已有统一认识,但是对于所测定温度的地质意义还存在争议。在对变质岩中金红石Zr含量温度计的应用研究中,一部分研究者发现这个温度计所得到的温度与造岩矿物阳离子配分温度计相吻合,因此可以指示峰期变质温度。然而,在对大别-苏鲁造山带超高压变质岩的研究中发现,金红石Zr含量温度计得到的温度比峰期变质温度明显偏低。通过对比国内外的研究分析,认识到不仅压力、活度、元素扩散、流体作用的参与导致的退变反应可能致使微量元素温度计所记录的温度偏低,而且矿物的不同生长世代或生长介质的不同都可能致使微量元素温度偏低。因此,在应用地质温度计时,要结合样品的岩相学、矿物包裹体和微量元素、U-Pb体系定年等方面予以综合考虑,并对矿物的形成环境和形成世代加以限定,从而为合理解释矿物中微量元素的分配及其记录的温度信息提供有效制约。
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| 关 键 词： | 金红石Zr温度计 锆石Ti温度计 俯冲带变质 榴辉岩 退变质 |
| 收稿时间： | 2010/10/20 0:00:00 |
| 修稿时间： | 2010/12/30 0:00:00 |
On the Zr-in-rutile and Ti-in-zircon geothermometers |
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| GAO XiaoYing and ZHENG YongFei.On the Zr-in-rutile and Ti-in-zircon geothermometers[J].Acta Petrologica Sinica,2011,27(2):417-432. |
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| Authors: | GAO XiaoYing and ZHENG YongFei |
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| Institution: | 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 |
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| Abstract: | The advents of Zr-in-rutile thermometer and Ti-in-zircon thermometer have prompted wide applications to petrological problems as well as ongoing tests of its validity. The thermometers have gained much attention and wide application to different types of high-grade metamorphic rocks due to their simplicity and validity. There are several different calibrations for each thermometer. However, the applicability of those calibrations is still ambiguous with hot debates on interpretation of thermometric data. So far, the studies of all thermometers are only limited to single component thermometer. Some studies have demonstrated that the metamorphic temperatures measured by the Zr-in-rutile thermometer are in good agreement with the results obtained by cation partition thermometers, suggesting that the Zr-in-rutile thermometers is capable of providing the peak metamorphic temperatures. On the other hand, Zr-in-rutile temperatures for Dabie-Sulu UHP metamorphic rocks were remarkably lower than those obtained by the other thermometers. By comparison of the different studies, it is realized that the lower temperatures from the Zr-in-rutile thermometry is possibly caused not only by the variations of TiO2 or SiO2 activity, pressure correction, element diffusivity and retrograde reaction in the presence of fluid, but also by different stages of mineral growth. Therefore, the petrographic paragenesis, mineral inclusions and trace elements, and U-Pb ages should be taken into account when applying the all thermometers to continental subduction-zone UHP metamorphic rocks. On this basis we are in a position to estimate the generations of minerals and conditions of their growth and thus to place reasonable constraints on the interpretation of thermometric data. |
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| Keywords: | Zr-in-rutile thermometer Ti-in-zircon thermometer Metamorphism in the subduction Eclogite Retrograde |
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