Abstract Raman elastic geobarometry has increasingly been used complementary to metamorphic phase equilibria to estimate the conditions of recrystallization in metamorphic rocks. The procedure of applying Raman elastic barometry to host-inclusion mineral systems requires several steps that involve various assumptions. One of the most essential assumptions is that the mineral host-inclusion system behaves in an elastic and reversible manner. We discuss the discrepant results obtained by different authors employing different analytical solutions for elasticity and explore the assumptions lying behind each method. Furthermore, we evaluate numerically linear and non-linear elastic solutions and show their discrepancies. Both formulations are tested against recently published experiments on quartz inclusions in garnet (QuiG) at pressures up to 3 GPa, and we find a very good agreement between calculated and experimental pressure values (within 10% relative error). We subsequently apply our new elastic geobarometer to a calc-silicate gneiss from the Rhodope Metamorphic Province (N. Greece). The results of Raman elastic barometry combined with garnet-clinopyroxene geothermometry yield eclogite-facies conditions (~720 ± 40 °C, ~1.5 ± 0.2 GPa). These results are comparable to a high-temperature metamorphic overprint deduced from phase equilibria modeling in surrounding lithologies (730 ± 40 °C, ~1.2 ± 0.1 GPa). Our findings indicate that the estimated pressure from Raman elastic barometry is consistent with a significant viscous relaxation at high temperatures. We conclude that although Raman elastic barometry is a powerful tool for pressure estimation in metamorphic rocks, its pressure estimates do not necessarily correspond to entrapment conditions. Our results are consequential for the estimates of reaction overstepping in high-grade metamorphic rocks.

中文翻译：

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用弹性地理气压计计算压力：不同弹性解法在罗多彼变质区钙硅酸盐片麻岩中的应用比较

摘要 拉曼弹性地球气压测量法越来越多地用于补充变质相平衡，以估计变质岩中的再结晶条件。将拉曼弹性气压测量法应用于宿主包裹体矿物系统的过程需要涉及各种假设的几个步骤。最重要的假设之一是矿物宿主包裹体系统以弹性和可逆的方式表现。我们讨论了不同作者使用不同弹性解析解获得的不同结果，并探讨了每种方法背后的假设。此外，我们评估数值线性和非线性弹性解决方案并显示它们的差异。两种配方都根据最近发表的关于石榴石 (QuiG) 中石英夹杂物的实验进行了测试，压力高达 3 GPa，我们发现计算压力值和实验压力值之间非常吻合（相对误差在 10% 以内）。随后，我们将新的弹性地球气压计应用于来自罗多彼变质省（希腊北部）的硅酸钙片麻岩。拉曼弹性气压测量法结合石榴石-斜辉石地温测量法得出榴辉岩相条件（~720 ± 40 °C，~1.5 ± 0.2 GPa）。这些结果与从周围岩性 (730 ± 40 °C, ~1.2 ± 0.1 GPa) 中的相平衡建模推导出的高温变质叠印相当。我们的研究结果表明，拉曼弹性气压计的估计压力与高温下的显着粘性松弛一致。我们得出的结论是，虽然拉曼弹性气压测量法是变质岩中压力估计的有力工具，它的压力估计不一定对应于诱捕条件。我们的结果对于高品位变质岩中反应越过的估计具有重要意义。