The systematics of Ar release during in vacuo stepwise heating of hydrous minerals is examined. By means of common-denominator three-isotope correlation diagrams, in use for 60 years, it is possible to recognize the presence of polymineralic mixtures in a step-heated mineral separate and characterize their components. These correlation diagrams, when applied to literature studies proposing Fick's Law diffusion during in vacuo stepwise heating, show that in actual fact these studies were based on partly retrogressed micas that were intergrown with their alteration products, probably at a scale < 20 μm so as to escape recognition during handpicking. The degassing of hydrous minerals in vacuo does not follow Fick's Law in an inert, homogeneous matrix, and instead proceeds from the structural collapse during dehydration. An alternative presentation discussed here quantifies the differential release of the Ar isotopes. Their release follows the structural collapse of their host phases and gives rise to remarkably well resolved patterns even in polymineralic samples.

检查了在真空逐步加热含水矿物过程中释放Ar的系统性。通过使用共分母三同位素相关图，使用了60年，就有可能认识到分步加热的矿物中多矿物混合物的存在并对其成分进行表征。这些相关图在应用于建议在真空逐步加热过程中的菲克定律扩散的文献研究时显示，实际上，这些研究基于部分倒退的云母，这些云母与它们的蚀变产物共生，规模可能小于20μm，从而在选择过程中无法识别。真空中对含水矿物的脱气不遵循费克定律在惰性，均匀的基质中进行，而是从脱水过程中的结构塌陷中进行。本文讨论的另一种表示方法量化了Ar同位素的差异释放。它们的释放遵循其宿主相的结构崩溃，即使在多矿物样品中也产生了非常好的分辨模式。