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Challenges in applying REE-based thermobarometers: Insights from mafic-ultramafic granulites in Indian southern granulite terrain

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Science China Earth Sciences 2024年第11期67卷 3448-3464页

作者： Xiaofei XU Longlong GOU Chengli ZHANG Junsheng LU Yan ZHAO Wenhao AO Yuhua HU feng ZHOU Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China

High-temperature diffusion of major elements may obscure the records of early and peak metamorphic stages in granulites,while trace elements are more likely to preserve these records due to their lower diffusion ***,using calibrated REE-based thermobarometers has proved essential for reconstructing these key stages,drawing considerable attention and application from ***,the precision of these thermobarometers depends on including both major and trace elements from coexisting minerals to define the correlation coefficients(A,B,and D) among mineral pairs,indicating that the elemental composition of these pairs can affect the *** study examines the mafic-ultramafic granulites in the southern granulite terrain,India,employing integrated methods such as petrography,mineral chemistry,phase equilibrium modeling,and REE-based *** aim to determine their metamorphic conditions and evolutionary history and to identify potential challenges in using REE-based *** garnet,clinopyroxene,and orthopyroxene in the mafic-ultramafic granulite samples display homogeneous compositional profiles,with pronounced fe-mg diffusion zones at the interfaces between garnet and ***,the profiles of trace elements within garnet and clinopyroxene are better *** into fe-mg exchange and randomly selected mineral pairs significantly influence the accuracy of REE-based ***-mg exchange can increase in coefficient A,while decreasing coefficient B for light rare earth elements(LREEs) and increasing it for heavy rare earth elements(HREEs),ultimately resulting in overestimations when calculating REE-based *** example,selecting major compositions with an Ex(=(X_(mg)^(C)-X_(mg)^(0))/X_(mg)^(0)×100%;where X_(mg)^(C) is the value after fe-mg exchange,X_(mg)^(0) is the value before fe-mg exchange;X_(mg)=mg/(fe^(2+)+mg)) value of ~10 for calculation using the REE-in-Grt-Cpx thermoba

关键词： Granulites REE-based thermobarometer fe-mg exchange Randomly selected mineral pairs

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