We have published in collaboration with Erik Duesterhoeft from the CAU University Kiel a paper in the Journal of Metamorphic Geology describing a new hybrid modelling strategy for thermobarometry applicable to metamorphic rocks. This contribution describes a mutually consistent strategy based on quantitative compositional mapping and the software solution Bingo-Antidote integrated in XMapTools.

Bingo-Antidote can be used for thermodynamic calculations at equilibrium based on iterative thermodynamic models (image from Duesterhoeft & Lanari, 2020). (a) An area-of-interest is defined and combined with quantitative compositional maps for extracting a local bulk composition along with the mineral assemblage, modes and compositions. (b) Iterative thermodynamic modelling combining a forward model (blue arrow) and an inversion (red arrow).

The technique relies on quantitative compositional maps acquired by electron probe micro-analyser for obtaining a mutually consistent set of observed data such as bulk rock and mineral compositions. It allows metamorphic conditions—pressure and temperature conditions of mineral formation—to be quantified from the investigation of local domains in compositional maps.

Determination of ‘Optimal’ P–T conditions using Bingo-Antidote (image from Duesterhoeft & Lanari, 2020). (a) Mineral distribution map showing the area-of-interest used to determine the local bulk composition. (b) Results of iterative thermodynamic modelling. Observed/modelled mineral modes and quality factors for the optimal solution of 671°C and 0.64 GPa obtained with recipe #1 of Antidote. (c, d) P–T maps of quality factor Qvol and Qtotal1.

Bingo-Antidote is integrated in the mapping software XMapTools via the add-on XThermoTools.

Find out more

Duesterhoeft, E. & Lanari, P. (2020). Iterative thermodynamic modelling – Part 1: A theoretical scoring technique and a computer program (BINGO-ANTIDOTE). Journal of Metamorphic Geology, 38, 527-551. Download pdf | Visit the journal webpage

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