Thermochemical imaging of the lithosphere and upper mantle from geophysical observations

what can we really see?

Walid Ben Mansour, Juan Carlos Afonso, Nicole Januszczak , Andrew Macdonald, Guust Nolet, Yosuke Aoki, Farshad Salajegheh

    Research output: Contribution to conferenceAbstract

    Abstract

    Estimates of the temperature and compositional structures of the lithosphere are important for exploration workflows, for understanding the evolution of topography, for interpreting geophysical anomalies, and for deciphering the physiochemical interactions between the lithosphere and the underlying convecting mantle. However, obtaining this type of information from geophysical observations is notoriously challenging mainly due to the non-uniqueness of the problem and the poor sensitivity of the data to the thermochemical structure. In the past 20 years, a number of approaches emerged that combine seismological observations, geodynamic modelling and potential field data. Some also include thermodynamic modelling within the inverse problem. In particular, Multi-observable Thermochemical Tomography (MTT) offers a general framework to image the physical state of the lithosphere and sublithospheric mantle by making use of different datasets with complementary sensitivities to different aspects of the problem [e.g. 1]. However, unsolved challenges remain, foremost among these are the multi-resolution nature of the problem as result of using different datasets and the computational cost involved in the probabilistic approach. Here we will show and discuss the latest results of a Multi-observable Thermochemical Tomography (MTT) in a number of different geodynamic setting (e.g. Western US, Africa, Galapagos and Island mantle plumes, Japan). Lastly, we will discuss some new potential applications of MTT to image the spatial and temporal variations of the subsurface’s physical state within the context of volcanoes, seismic cycle (inter-seismic and post-seismic phase) and post-glacial rebound.
    Original languageEnglish
    Publication statusPublished - 2019
    EventAGU Fall Meeting 2019 - San Francisco, United States
    Duration: 9 Dec 201913 Dec 2019
    https://agu.confex.com/agu/fm19/prelim.cgi/Home/0

    Conference

    ConferenceAGU Fall Meeting 2019
    CountryUnited States
    CitySan Francisco
    Period9/12/1913/12/19
    Internet address

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  • Cite this

    Ben Mansour, W., Afonso, J. C., Januszczak , N., Macdonald, A., Nolet, G., Aoki, Y., & Salajegheh, F. (2019). Thermochemical imaging of the lithosphere and upper mantle from geophysical observations: what can we really see?. Abstract from AGU Fall Meeting 2019, San Francisco, United States.