Elastic Geobarometry for Anisotropic Inclusions in Anisotropic Host Minerals: Quartz‐in‐Zircon
Elastic Geobarometry for Anisotropic Inclusions in Anisotropic Host Minerals: Quartz‐in‐Zircon
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各向异性宿主矿物中各向异性包裹体的弹性地压测量：石英、锆石
DOI：
10.1029/2021jb022080
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Alvaro, Matteo
中科院分区：
文献类型：
--
作者：
Gonzalez, Joseph P.;Mazzucchelli, Mattia L.;Angel, Ross J.;Alvaro, Matteo
目前的弹性地球压力测量模型是基于宿主和/或包裹体矿物是弹性各向同性的假设而发展起来的。这一假设限制了弹性温压法对立方准各向同性寄主矿物(如石榴石)中矿物包裹体的应用。在这里，我们报告了一个新的弹性模型，该模型考虑了主体-包裹体系统的各向异性弹性性质和相对结晶取向(RCO)，其中两种矿物都是非立方体的。在已知基质和包裹体的RCO和弹性性质的情况下，该各向异性弹性模型可用于基质-包裹体弹性温压计算。然后，我们用这个各向异性弹性模型数值地评估了弹性各向异性和RCO对包裹在锆石中的石英包裹体从已知的包裹体P-T条件到房间P-T条件剥离后产生的应变和应力的影响。我们认为，各向异性石英-锆石弹性模型适用于弹性温压测量，可广泛应用于地壳岩石。我们的结果表明，各向同性弹性模型不能用来确定包含在弹性各向异性寄主矿物中的弹性各向异性包裹体的整个应变状态，因此可能导致对残余包裹体压力的估计误差。
Current models for elastic geobarometry have been developed with the assumption that the host and/or inclusion minerals are elastically isotropic. This assumption has limited applications of elastic thermobarometry to mineral inclusions contained in cubic quasi‐isotropic host minerals (e.g., garnet). Here, we report a new elastic model that takes into account the anisotropic elastic properties and relative crystallographic orientation (RCO) of a host‐inclusion system where both minerals are noncubic. This anisotropic elastic model can be used for host‐inclusion elastic thermobarometric calculations provided that the RCO and elastic properties of both the host and inclusion are known. We then used this anisotropic elastic model to numerically evaluate the effects of elastic anisotropy and RCO on the strains and stresses developed in a quartz inclusion entrapped in a zircon host after exhumation from known entrapmentP‐Tconditions to roomP‐Tconditions. We conclude that the anisotropic quartz‐in‐zircon elastic model is suitable for elastic thermobarometry and may be widely applicable to crustal rocks. Our results demonstrate that isotropic elastic models cannot be used to determine the entire strain state of an elastically anisotropic inclusion contained in an elastically anisotropic host mineral, and therefore may lead to errors on estimated remnant inclusion pressures.
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