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First evaluation of stiff-in-soft host–inclusion systems: experimental synthesis of zircon inclusions in quartz crystals
Contributions to Mineralogy and Petrology ( IF 3.5 ) Pub Date : 2024-01-27 , DOI: 10.1007/s00410-023-02081-1
Joseph P. Gonzalez , Jay B. Thomas , Mattia L. Mazzucchelli , Ross J. Angel , Matteo Alvaro

Quartz crystals with zircon inclusions were synthesized using a piston-cylinder apparatus to experimentally evaluate the use of inclusions in “soft” host minerals for elastic thermobarometry. Synthesized zircon inclusion strains and, therefore, pressures (Pinc) were measured using Raman spectroscopy and then compared with the expected inclusion strains and pressures calculated from elastic models. Measured inclusion strains and inclusion pressures are systematically more tensile than the expected values and, thus, re-calculated entrapment pressures are overestimated. These discrepancies are not caused by analytical biases or assumptions in the elastic models and strain calculations. Analysis shows that inclusion strain discrepancies progressively decrease with decreasing experimental temperature in the α-quartz field. This behavior is consistent with inelastic deformation of the host–inclusion pairs induced by the development of large differential stresses during experimental cooling. Therefore, inclusion strains are more reliable for inclusions trapped at lower temperature conditions in the α-quartz field where there is less inelastic deformation of the host–inclusion systems. On the other hand, entrapment isomekes of zircon inclusions entrapped in the β-quartz stability field plot along the α–β quartz phase boundary, suggesting that the inclusion strains were mechanically reset at the phase boundary during experimental cooling and decompression. Therefore, inclusions contained in soft host minerals can be used for elastic thermobarometry and inclusions contained in β-quartz may provide constraints on the PT at which the host–inclusion system crossed the phase boundary during exhumation.



中文翻译:

软硬主体-夹杂物系统的首次评估:石英晶体中锆石夹杂物的实验合成

使用活塞缸装置合成了带有锆石夹杂物的石英晶体,以实验评估夹杂物在“软”基质矿物中用于弹性温压测量的用途。使用拉曼光谱测量合成的锆石夹杂物应变和压力 ( P inc ),然后与根据弹性模型计算的预期夹杂物应变和压力进行比较。测量的夹杂物应变和夹杂物压力系统地比预期值更具张力,因此,重新计算的截留压力被高估。这些差异不是由弹性模型和应变计算中的分析偏差或假设引起的。分析表明,随着α-石英场中实验温度的降低,夹杂物应变差异逐渐减小。这种行为与实验冷却过程中大差异应力的发展引起的主体-夹杂物对的非弹性变形一致。因此,对于在 α-石英场中较低温度条件下捕获的夹杂物来说,夹杂物应变更可靠,其中主体-夹杂物系统的非弹性变形较小。另一方面,β-石英稳定性场图中沿着α-β石英相界捕获的锆石包裹体的包裹等分线表明,在实验冷却和减压过程中,夹杂物应变在相界处被机械重置。因此,软基质矿物中所含的包裹体可用于弹性温压测定,β-石英中所含的包裹体可对折返过程中基质-包裹体系统穿过相界的PT提供限制。

更新日期:2024-01-28
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