QuIB Calc: A MATLAB® script for geobarometry based on Raman spectroscopy and elastic modeling of quartz inclusions in garnet

被引:20
作者
Ashley, Kyle T. [1 ]
Steele-MacInnis, Matthew [1 ]
Caddick, Mark J. [1 ]
机构
[1] Virginia Tech, Dept Geosci, Blacksburg, VA 24061 USA
关键词
Mineral inclusions; P-V-T relations; Metamorphic rocks; Pressure evolution; Elastic model; RESIDUAL PRESSURE; SUBDUCTION ZONES; EQUILIBRIA; MINERALS; EQUATION; SPECTRA; STATE;
D O I
10.1016/j.cageo.2014.01.005
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
Quartz inclusion thermobarometry utilizes the pressure- and temperature-sensitive Raman peak shifts of quartz inclusions in garnet to determine formation pressure and temperature (PT) conditions. The measured Raman shift indicates the pressure currently retained in the inclusions at ambient external conditions, such that entrapment PT conditions (i.e., P and T of garnet growth) can be determined by elastic modeling. Most generally, trapping P is obtained with this method, based on an independent estimate of T. Here we describe QuIB Calc, a MATLAB((R)) program that iteratively solves for garnet growth conditions using the pressure retained in quartz inclusions (as revealed by Raman peak shifts). The program explicitly accounts for the anomalous effects of the quartz lambda transition on the thermal expansivity, and utilizes a mixing subroutine to account for the physical properties of garnet solid solutions. QuIB Calc thus facilitates sophisticated PT calculations using quartz inclusions, and is particularly effective for geobarometry in high pressure terranes. Published by Elsevier Ltd.
引用
收藏
页码:155 / 157
页数:3
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