We consider here the validity, accuracy, and precision of rhyolite-MELTS modelling in inferring the pre-eruptive magma storage conditions for the caldera-forming 25.5 ka Oruanui and 232 CE (1.72 ka) Taupō eruptions at Taupō volcano, New Zealand as proposed by Pamukçu et al. (2020: Contrib Mineral Petrol 175: 48). There are four major issues with the modelling as used. First, the model is inappropriately applied for the Taupō event as this magma does not contain phenocrystic quartz. Second, the products of both eruptions, as is typical for virtually all Taupō Volcanic Zone rhyolites, contain plagioclase but lack sanidine, leading to increased model errors beyond those stated. Third, temperatures utilised for modelling crystallisation histories for both magmas are in conflict with independent measures of magmatic temperatures for these rocks. Fourth, glass compositions for each of these eruptions individually fall within analytical uncertainty yet yield model pressures that vary over hundreds of MPa, in part due to contrasting analytical protocols. We conclude that rhyolite-MELTS is too imprecise (errors of ± ~ 100 MPa or more for the methods applied) for quartz + 1 feldspar systems like at Taupō volcano specifically and the Taupō Volcanic Zone in general to be applied with confidence to deriving relative or absolute depths of magma storage.

我们在此考虑流纹岩-MELTS 建模在推断新西兰陶波火山形成的 25.5 ka Oruanui 和 232 CE (1.72 ka) Taupō 火山喷发的喷发前岩浆储存条件时的有效性、准确性和精确度。帕穆克丘等人。（2020 年：Contrib Mineral Petrol 175：48）。所使用的建模有四个主要问题。首先，该模型不适用于陶波事件，因为该岩浆不含斑晶石英。其次，两次喷发的产物，正如几乎所有陶波火山带流纹岩的典型特征一样，都含有斜长石但缺乏闪长石，导致模型误差增加，超出所述误差。第三，用于模拟两种岩浆结晶历史的温度与这些岩石的岩浆温度的独立测量值相冲突。第四，这些喷发中的每一个的玻璃成分都属于分析不确定性，但产生的模型压力变化超过数百 MPa，部分原因是对比分析协议。我们得出的结论是，流纹岩-熔体太不精确（所应用方法的误差为 ± ~ 100 MPa 或更多）对于石英 + 1 长石系统，如陶波火山和一般陶波火山带，无法自信地应用于推导相对或岩浆储存的绝对深度。