低温高压榴辉岩锆石Ti温度计的有效性

蔺梦; 张贵宾; 宋述光; 李慧娟; 张丽娟

doi:10.3799/dqkx.2019.268

低温高压榴辉岩锆石Ti温度计的有效性

doi: 10.3799/dqkx.2019.268

北京大学地球与空间科学学院, 造山带与地壳演化重点实验室, 北京 100871

基金项目:

国家“973”计划项目 2015CB56105

国家自然科学基金项目 41972056

国家自然科学基金项目 41622202

国家自然科学基金项目 91755206

国家重点研发计划项目 2017YFC0601302

详细信息

作者简介:
蔺梦(1994-), 女, 博士, 主要从事变质岩和地球化学研究

中图分类号: P595
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- 被引次数: 0
出版历程
- 收稿日期: 2019-09-02
- 刊出日期: 2019-12-15

The Validity of Ti-in-Zircon Thermometry in Low-Temperature/High-Pressure Eclogites

Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Science, Peking University, Beijing 100871, China

摘要

摘要: 为了探讨锆石的Ti温度计对于低温高压（超高压）榴辉岩的适用性，利用前人版本的温度计对北祁连和西天山4个典型低温高压（超高压）榴辉岩中的锆石进行了温度计算.结合其他地区高压/超高压榴辉岩锆石文献数据，发现对于低温变质锆石，Ti温度计得到的结果普遍高于其他温度计算方法，最高可达到58%.虽然温度是控制锆石中Ti含量的主要因素，但是其他因素（例如压力、SiO₂和TiO₂的活度，锆石中的晶格缺陷、其他微量元素替代、锆石的不平衡生长和变质流体活动）也会影响锆石Ti温度计的计算结果.研究认为，在锆石重结晶和再生长过程中，流体活动可能是造成锆石Ti温度计计算结果偏高的主要原因.
- 锆石 /
- 锆石Ti温度计 /
- 低温高压(超高压)榴辉岩 /
- 变质流体 /
- 岩石学
Abstract: In order to investigate the applicability of Ti-in-zircon thermometry to low temperature and high pressure eclogites,we used the calibration of other scholars to estimate the metamorphic temperatures for four typical low-temperature and high (ultrahigh)-pressure eclogites from North Qilian and western Tianshan,China. Compiled different HP/UHP eclogite samples from the literature,the Ti-in-zircon temperatures are generally higher than the estimations by other thermometers (up to 58%),especially for low-temperature metamorphic zircon. Although temperature exerts the dominant control on Ti content in zircon,other factors (e.g. pressure,TiO₂ and SiO₂ activity,lattice defect,other trace element substitutions,disequilibrium zircon growth and metamorphic fluids) also influence the calculated temperature results. This study proposes the metamorphic fluids may have contributed to the overestimated Ti-in-zircon temperatures.
- zircon /
- Ti-in-zircon thermometer /
- low-temperature/high (ultrahigh)-pressure eclogite /
- metamorphic fluids /
- petrology

HTML全文

图 1 锆石阴极发光图像和Ti、U元素含量

温度数据根据Ferry and Watson(2007)提出的锆石Ti温度计计算，空心圆圈代表激光剥蚀点.a和b.样品QS45；c.样品2Q27；d.样品15BJS；e~h.样品HB121;Ti, U的单位为10^-6

Fig. 1. Cathodoluminescene images of zircon samples with Ti and U contents

下载: 全尺寸图片幻灯片

图 2 不同地区榴辉岩样品的锆石Ti温度计和其他温度计温度结果对比

a.大别-苏鲁造山带；b.红安、桐柏和北山造山带；c.柴北缘和北祁连造山带；d.西南天山、阿尔卑斯造山带、弗朗西斯科杂岩、希腊蒂诺斯岛和罗多彼杂岩

Fig. 2. Plots of the Ti-in-zircon temperatures vs. estimations by other thermometers for eclogite samples

下载: 全尺寸图片幻灯片

图 3 相同地区同岩性样品的锆石Ti温度计和其他温度计温度结果对比

a.石榴石-单斜辉石Fe-Mg交换温度计和其他矿物对温度计；b.金红石Zr温度计，石英-矿物氧同位素温度计和相平衡模拟

Fig. 3. Plots of the Ti-in-zircon temperatures for all samples compiled vs. the results from other thermometers

下载: 全尺寸图片幻灯片

图 4 锆石Ti-U相关性对比

a.大洋型榴辉岩样品；b.大陆型榴辉岩样品

Fig. 4. Plots of Ti vs. U contents in zircon

下载: 全尺寸图片幻灯片

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