WinGrt, a Windows program for garnet supergroup minerals

[摘要] A Microsoft® Visual Basic software, called WinGrt, has been developed to calculate and classify wet-chemical andelectron-microprobe garnet supergroup mineral analyses. The program evaluates 33 approved species that belong to thetetragonal henritermierite and isometric bitikleite, schorlomite, garnet and berzeliite groups based on the Commissionon New Minerals and Mineral Names (CNMMN) of the International Mineralogical Association (IMA–13) nomenclature scheme. WinGrt also evaluates thirty geothermometers using the Fe2+–Mg exchange reactions for garnet–biotite,garnet–clinopyroxene and garnet–orthopyroxene pairs within the application range of greenschist-, amphibolite-, granulite- and eclogite-facies metamorphic rocks. As naturally occurring garnet is potentially a useful provenance indicator,the program calculates end-member molecules from chemical compositions on the basis of different approaches andyields pyrope, almandine, spessartine, grossular, andradite and schorlomite phase on various ternary discriminationdiagrams used in provenance studies. The ferric and ferrous iron contents from total FeO (wt. %) amount are estimatedby stoichiometric constraints. The program allows the users to enter 30 input variables including Sample No, SiO2,TiO2, ZrO2, HfO2, Th2O, SnO2, Al2O3, Cr2O3, V2O3, Fe2O3, Mn2O3, Sc2O3, Y2O3 + REE2O3, FeO, MgO, MnO, ZnO, CaO,Na2O, Li2O, P2O5, V2O5, Sb2O5, As2O5, Nb2O5, UO3, Te2O3, F and H2O (wt. %). WinGrt also enables the user to enter thetotal REE2O3 (wt. %) as input values from La2O3 to Lu2O3 (wt. %) of garnet supergroup mineral analyses in program’sdata edit section. WinGrt enables the user to type or load multiple garnet compositions in the data entry section, to editand load Microsoft® Excel files in calculating, classifying and naming the garnet species, and to store all the calculatedparameters in the Microsoft® Excel file for further evaluation.

[学科分类] 自动化工程

[关键词] garnet;geothermometer;biotite;pyroxene;provenance;software