[LPT] Diffusion Chronometry Geospeedometry


EN | Diffusion chronometry, also known as geospeedometry, is a technique that can be used to constrain the duration of thermal pulses of a geological event, for example, by modeling the diffusion of element profiles in minerals. The technique involves measuring the diffusive loss of an element during the heating and/or cooling history of a rock, giving information about the time-integrated thermal response of geological events coupled with an excellent time resolution (<10 Mry). Check out our #learningpetrotools to learn more about its premises and applications.


PT | A cronometria de difusão, também conhecida como geospeedometria, é uma técnica usada para determinar a duração dos pulsos térmicos de um evento geológico, por exemplo, por meio da modelagem de difusão de perfis de elementos nos minerais. A técnica envolve a medição da perda difusiva de um elemento durante a história de aquecimento e/ou resfriamento de uma rocha. Com sua aplicação, são obtidas informações sobre a resposta térmica (de minerais?) integrada no tempo de eventos geológicos, com ótima resolução temporal (<10 Mry). Confira as nossas #learningpetrotools para saber mais sobre suas premissas e aplicações.


Author: Lucas Tesser

References

  • Lasaga, A. C. (1983). Geospeedometry: an extension of geothermometry. In Kinetics and equilibrium in mineral reactions (pp. 81–114). Springer.
  • Thigpen, J. R., Ashley, K. T., Mako, C., Law, R. D., & Spencer, B. (2021). Interplay Between Crustal‐Scale Thrusting, High Metamorphic Heating Rates, and the Development of Inverted Thermal‐Metamorphic Gradients: Numerical Models and Examples From the Caledonides of Northern Scotland. Tectonics, 40(11).
  • Viete, D. R., Hermann, J., Lister, G. S., & Stenhouse, I. R. (2011). The nature and origin of the Barrovian metamorphism, Scotland: diffusion length scales in garnet and inferred thermal time scales. Journal of the Geological Society, 168(1), 115–132.

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