Development of geothermometer suitable for estimating the formation temperature of trioctahedral chlorite and its application

绿泥石是一种常见的造岩矿物，存在于各种地质环境中，包括成岩、低到高变质和热液蚀变岩石中，具有不同的岩石组成。它显示出广泛的非化学计量成分变化，这取决于岩石组成和地层中普遍存在的物理化学条件。因此，绿泥石化学成分的变化对获取地层物理化学条件的信息是有用的；利用绿泥石组成估算地层温度称为化学绿泥石地温法。我们开发了一种适用于低温绿泥石的简易地温计，并在本研究的多个领域进行了应用，验证了其有效性。

Chlorite is a common rock-forming mineral that is found in a variety of geologic environments including diagenetic, low- to high-grade metamorphic, and hydrothermally altered rocks with different bulk rock compositions. It displays a wide range of non-stoichiometric compositional variations depending on bulk rock composition and physicochemical conditions prevailed at the formation. The variation of chemical composition in chlorite, therefore, is useful to take off the information on the physicochemical conditions of the formation ; the use of chlorite composition for estimating the formation temperature is called chemical chlorite geothermometry. We developed a convenient geothermometer applicable to low-temperature chlorites and also verified the validity by applying it to several fields in the present study.