On the Zr-in-rutile and Ti-in-zircon geothermometers
On the Zr-in-rutile and Ti-in-zircon geothermometers
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关于金红石中锆和锆石中钛地温计
DOI：
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发表时间：
2011
影响因子：
1.8
通讯作者：
Zheng YongFei
中科院分区：
文献类型：
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作者：
Gao XiaoYing;Zheng YongFei
金红石中锆温度计和锆石中钛温度计的出现，促进了它们在岩石学问题中的广泛应用，并对其有效性进行了不断的检验。这两种温度计因其简单有效而受到广泛关注，并广泛应用于不同类型的高级变质岩中。每种温度计都有几种不同的刻度。然而，这些校准的适用性仍然是模糊的，关于温度数据的解释存在激烈的争论。所有温度计的研究都仅限于单组分温度计，一些研究表明，用Zr-in-ZrO_2测量的变质温度，结果表明，金红石相温度计与阳离子配分温度计的结果基本一致，表明金红石相温度计能够提供峰变质温度，而大别-苏鲁超高压变质岩石的金红石相温度明显低于其它温度计的温度，通过比较，认为金红石中Zr测温的低温不仅可能是由于TiO_2或SiO_2活度、压力校正、元素扩散率和流体存在时的退变反应的变化，而且可能是由于矿物生长的不同阶段造成的，因此，在对大陆俯冲带超高压变质岩应用各种温度计时，应考虑U-Pb年龄，在此基础上估计矿物的世代和生长条件，从而对温度计数据的解释提出合理的约束。
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.