In modern volcanology the knowledge in detail of magma plumbing systems beneath active volcanoes is an important piece of information in volcanic risk managment. In this regard, I use glass and mineral chemical data to unravel timescales, dynamics and magma storage conditions related to different eruptions in the Canary Islands  (Tenerife and La Palma), though the application of well-known thermobarometric calibrations and experimental diffusion data. I am particularly interested in eruption deposits showing evidence of interaction of different magmas (e.g. banded pumices), before or during the eruptive event.

Under this research line, we recently investigated filamentary strucutres present in tephra from the first days of the recent Cumbre Vieja 2021 eruption at La Palma. We modelled diffusion timescaels in electron microprobe transects to infer survival timescales in the order of tens of seconds to minutes, suggesting their origin in the shallow coinduit. 

• González-Garcia, D., Petrelli, M., Perugini, D., Giordano, D., Vasseur, J., Paredes-Mariño, J., Marti, J., Dingwell, D.B. (2022). Pre-eruptive conditions and dynamics recorded in banded pumices from the El Abrigo caldera-forming eruption (Tenerife, Canary Islands). Journal of Petrology 63 (3), egac009. doi: 10.1093/petrology/egac009

• González-García, D., Boulesteix, T., Klügel, A., Holtz; F. (2023). Bubble-enhanced basanite-tephrite mixing in the early stages of the Cumbre Vieja 2021 eruption, La Palma, Canary Islands. Scientific Reports 13, 14839. doi: 10.1038/s41598-023-41595-3

My experimental research is centred in diffusion in silicate melts at high pressure and high temperature, mainly involving melts of contrasting compositions relevant of some selected volcanic systems. Diffusion is a key phenomenon for understanding kinetic processes happening in natural magmas under active volcanoes, such as crystal growth and dissolution or magma mixing and has wide applications to understand timescales of pre-eruptive processes and ascent rates.

• González-García, D., Vetere, F., Behrens, H., Petrelli, M., Morgavi, D., & Perugini, D. (2019). Interdiffusion of major elements at 1 atmosphere between natural shoshonitic and rhyolitic melts. American Mineralogist 104 (10), 1444-1454. doi: 10.2138/am-2019-6997

• González-García, D., Petrelli, M., Behrens, H., Vetere, F., Fischer, L.A., Morgavi, D., & Perugini, D. (2018). Diffusive exchange of trace elements between alkaline melts: implications for element fractionation and timescale estimations during magma mixing. Geochimica et Cosmochimica Acta 233, 95-114. doi: 10.1016/j.gca.2018.05.003

• González-García, D., Behrens, H., Petrelli, M., Vetere, F., Morgavi, D., Zhang, C., Perugini, D. (2017).  Water-enhanced interdiffusion of major elements between natural shoshonite and high-K rhyolite melts. Chemical Geology 466, 86-101. doi: 10.1016/j.chemgeo.2017.05.023 

Raman spctroscopy is a rapidly growing analytical technique among the Earth and planetary science community. Because its ease of use and the availavility of portable devices, it allows a rapid characterization of many geologic materials, even in the field. My focus is the application of Raman spectrsocpy to silicate glasses to characterize compostional and structural parameters (e.g. water contents, compositions), and its application to particular natural case studies.

• González-Garcia, D., Giordano., D., Russell, J.K., Dingwell, D.B. (2020). A Raman spectroscopic tool to estimate chemical composition of natural volcanic glasses. Chemical Geology 556, 119819. doi: 10.1016/j.chemgeo.2020.119819

• González-García, D., Giordano, D., Allabar, A., Andrade, F.R.D., Polo, L.A., Janasi, V.A., Lucchetti, A.C.F., Hess K-U., De Campos C., Dingwell D.B.  (2020). Retrieving dissolved water content from micro-Raman spectroscopy on nanolitized silicic glasses: application to volcanic products of the Parana-Etendeka Magmatic Province, Brazil. Chemical Geology 567, 120058. doi: 10.1016/j.chemgeo.2021.120058