视剖面图地质温压计及其应用

Pseudosection thermobarometer and its application

视剖面图地质温压计是近年来发展迅速的一种地质温压计,在岩石学和成因矿物学研究中得到了非常广泛的应用。在视剖面图中,矿物组合稳定域、矿物含量和矿物成分等值线等方法均可用于估算岩石形成的温压条件。本文介绍了视剖面图地质温压计的基本原理,以实例探讨了这3种方法的优缺点,并分析了热力学相平衡模拟的影响因素,为该温压计的地质应用提供理论支持。结果表明,视剖面图地质温压计是目前估算岩石变质作用温压条件及p-t轨迹最好的地质温压计,其中矿物成分等值线是最为有效的方法。视剖面图地质温压计在未来具有广阔的应用前景。

Pseudosection geothermobarometer,a highly developed geothermobarometers in recent years,has had a wide application in the study of petrology and genetic mineralogy.Several approaches,such as p-t fields of mineral assemblages,isopleths of minerals components and mineral compositions in pseudosections,can be used to determine the p-t conditions of metamorphic rocks.The fundamental principles of the pseudosection geothermobarometer is introduced and the advantages and the disadvantages of the above three approaches are discussed with examples.Influencing factors of thermodynamic phase equilibrium simulation are analyzed in order to provide theory support for its geological application. It shows that the pseudosection geothermobarometer is the best geothermobarometer to estimate the temperature and pressure conditions and p-t trajectory of rock metamorphism.Of the 3 approaches,the mineral composition isopleths is the most effective method.There is no doubt that the pseudosection geothermobarometer has a broad application prospect in the future.