Differential stress magnitude is a fundamental parameter in the study of geodynamic processes in the continental lithosphere, and is typically estimated in quartz- and olivine-dominated lithologies using recrystallized grain size piezometers. Here we evaluate the piezometric relationships in natural mylonites with mineral pairs of quartz–feldspar and olivine–orthopyroxene, which commonly coexist in deformed crustal and mantle rocks, respectively. To analyze mineral pairs, we measured dynamically recrystallized grain sizes in both phases that deformed under approximately isoviscous conditions. Using the experimentally calibrated piezometers for quartz and olivine, we develop piezometric relationships for feldspar and orthopyroxene. These new feldspar and orthopyroxene piezometers reasonably predict grain size relationships observed for mineral pairs from naturally deformed lithospheric shear zones. Combining our naturally constrained datasets with the existing experimental datasets for feldspar and orthopyroxene, we also derive piezometers that are consistent with the wattmeter model and with observations from other studies of mylonitic rocks. Our results provide an alternative for estimating stress in rocks such as granulites and pyroxenites, for which the quartz and olivine piezometers are unsuitable.

差分应力大小是大陆岩石圈地球动力学过程研究的基本参数，通常使用重结晶粒度测压计在石英和橄榄石为主的岩性中进行估计。在这里，我们评估了天然糜棱岩与石英-长石和橄榄石-斜方辉石矿物对的测压关系，它们通常分别共存于变形的地壳和地幔岩石中。为了分析矿物对，我们测量了在近似等粘性条件下变形的两个相中的动态再结晶晶粒尺寸。使用石英和橄榄石的实验校准压力计，我们开发了长石和斜方辉石的压力关系。这些新的长石和斜方辉石压力计可以合理地预测从自然变形的岩石圈剪切带中观察到的矿物对的粒度关系。将我们的自然约束数据集与现有的长石和斜方辉石实验数据集相结合，我们还推导出了与瓦特计模型和糜棱岩其他研究的观察结果一致的压力计。我们的结果为估计麻粒岩和辉石岩等岩石中的应力提供了一种替代方法，石英和橄榄石压力计不适合这些岩石。我们还推导出与瓦特计模型和糜棱岩其他研究结果一致的压力计。我们的结果为估计麻粒岩和辉石岩等岩石中的应力提供了一种替代方法，石英和橄榄石压力计不适合这些岩石。我们还推导出与瓦特计模型和糜棱岩其他研究结果一致的压力计。我们的结果为估计麻粒岩和辉石岩等岩石中的应力提供了一种替代方法，石英和橄榄石压力计不适合这些岩石。