Calibration and Application of a Ti-in-Quartz Geothermometer

钛石英地温计的标定及应用

• 批准号: 0409622
• 负责人: David Wark
• 金额: --
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-06-01 至 2007-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0409622&HistoricalAwards=false
• 关键词: Calibration; Application; Ti; Quartz; Geothermometer

This award will support the development and application of a geothermometer based on the titanium-content of quartz. The thermometer will be calibrated by equilibrating quartz with rutile and fluid at a range of pressure and temperature conditions. Application of the thermometer will be tested by using it to characterize the thermal history of selected igneous and metamorphic rocks. Although the calibration assumes a TiO2 activity of one, it can be modified to apply to systems lacking a pure TiO2 phase if Ti activity can be estimated by some other means. Because quartz is one of the most abundant minerals in Earth's crust, this thermometer - which has a precision roughly an order of magnitude better than that of most geothermometers in application today - promises to shed new light on the thermal histories of many rock types. The thermometer should prove especially powerful when combined with imaging of cathodoluminescence intensity, which often reveals a detailed record of growth history, and which appears to be strongly correlated with the Ti content of quartz.

该奖项将支持基于石英钛含量的地质温度计的开发和应用。温度计将通过在一系列压力和温度条件下平衡石英与金红石和流体来校准。将通过使用温度计来表征选定的火成岩和变质岩的热历史来测试温度计的应用。虽然校准假设TiO 2活性为1，但如果Ti活性可以通过一些其他方法估计，则可以对其进行修改以适用于缺乏纯TiO 2相的系统。由于石英是地壳中最丰富的矿物之一，这种温度计的精度比目前应用的大多数地质温度计高出一个数量级，有望为许多岩石类型的热历史提供新的线索。当结合阴极发光强度成像时，温度计应该证明是特别强大的，阴极发光强度成像通常揭示了生长历史的详细记录，并且似乎与石英的Ti含量密切相关。