Dr. Maria Isabel Varas-Reus

Research interests

My research interests are mainly focused on the origin and evolution of the Earth's upper mantle and its interaction with the crust. Currently, my research involves the study of non-traditional stable selenium isotopes in mantle peridotites and sulfides to provide new insights into the Earth’s upper mantle chalcophile and volatile record.

Short CV

Publications

• Wagner LJ, Kleinhanns IC, Varas-Reus MI, Rosca C, König S, Bach W & Schoenberg R (2023): Light stable Cr isotope compositions of mid-ocean ridge basalts: Implications for mantle source composition. Geochimica et Cosmochimica Acta; https://doi.org/10.1016/j.gca.2023.04.028
• Rahmani F, Vara-Reus MI, Marchesi C, Noghreyan M, Mackizadeh MA, Garrido CJ (2023): Petrological and geochemical evidence for partial melting and melt-rock interaction in mantle rocks from the eastern part of the Sabzevar ophiolite, NE Iran. International Geology Review 1-24, https://doi.org/10.1080/00206814.2023.2188492
• Ossa Ossa FG, Spangenberg JE, Bekker A, König S, Stüeken EE, Hofmann A, Poulton SW, Yierpan A, Varas-Reus MI. Eickmann B, Andersen MB & Schoenberg R (2022): Moderate levels of oxygenation during the late stage of Earth's Great Oxidation Event. Earth and Planetary Science Letters 594: 117716, https://doi.org/10.1016/j.epsl.2022.117716
• Rosca C, Vlastelic I, Varas-Reus M, König S. (2022). Isotopic constraints on selenium degassing from basaltic magma and near-surface capture by fumarolic deposits: Implications for Se redistribution onto the Earth's surface. Chemical Geology 596, 120796, https://doi.org/10.1016/j.chemgeo.2022.120796
• König S, Rosca C, Kurzawa T, Varas-Reus M-I, Dragovic B, Schoenberg R, John T (2021): Selenium isotope evidence for pulsed flow of oxidative slab fluids. Geochemical Perspectives Letters 17, 27-32. https://doi: 10.7185/geochemlet.2110
• Cabral A, König S, Eickmann B, Brauns M, Tupinambá M, Lehmann B, Varas-Reus MI (2021): Extreme fractionation of selenium isotopes and possible deep biospheric origin of platinum nuggets from Minas Gerais, Brazil. Geology 49, https://doi.org/10.1130/G49088.1
• Varas-Reus MI, König S, Yierpan A, Lorand JP, Schoenberg R (2019): Selenium isotopes as tracers of a late volatile contribution to Earth from the outer Solar System. Nature Geoscience, doi:10.1038/s41561-019-0414-7 (2019).
• Varas-Reus MI, Garrido C J, Marchesi C, Bosch D, Hidas K (2018): Genesis of ultra-high pressure garnet pyroxenites in orogenic peridotites and its bearing on the compositional heterogeneity of the Earth’s mantle. Geochimica et Cosmochimica Acta 232, 303-328.
• Varas-Reus MI, Garrido CJ, Marchesi C, Bosch D, Acosta-Vigil A, Hidas K, Barich A, and Booth-Rea G (2017): Sr-Nd-Pb isotopic systematics of crustal rocks from the western Betics (S. Spain): Implications for crustal recycling in the lithospheric mantle beneath the westernmost Mediterranean. Lithos 276, 45-61.
• Marchesi C, Konc Z, Garrido CJ, Bosch D, Hidas K, Varas-Reus MI, and Acosta-Vigil A (2017): Multi-stage evolution of the lithospheric mantle beneath the westernmost Mediterranean: Geochemical constraints from peridotite xenoliths in the eastern Betic Cordillera (SE Spain). Lithos 276, 75-89.
• Varas-Reus MI, Garrido CJ, Marchesi C, Bodinier J-L, Frets E, Bosch D, Tommasi A, Hidas K, and Targuisti K (2016): Refertilization Processes in the Subcontinental Lithospheric Mantle: the Record of the Beni Bousera Orogenic Peridotite (Rif Belt, Northern Morocco). Journal of Petrology 57, 2251-2270.
• Hidas K, Konc Z, Garrido CJ, Tommasi A, Vauchez A, Padrón-Navarta JA, Marchesi C, Booth-Rea G, Acosta-Vigil A, Szabó C, Varas-Reus MI, and Gervilla F (2016): Flow in the western Mediterranean shallow mantle: insights from xenoliths in Pliocene alkali basalts from SE Iberia (eastern Betic Cordillera, Spain). Tectonics 35, 2657-2676.
• Marchesi C, Garrido CJ, Proenza JA, Hidas K, Varas-Reus MI, Butjosa L, and Lewis JF (2016): Geochemical record of subduction initiation in the sub-arc mantle: Insights from the Loma Caribe peridotite (Dominican Republic). Lithos 252-253, 1-15.
• Hidas K, Varas-Reus MI, Garrido CJ, Marchesi C, Acosta-Vigil A, Padrón-Navarta JA, Targuisti K, and Konc Z (2015): Hyperextension of continental to oceanic-like lithosphere: The record of late gabbros in the shallow subcontinental lithospheric mantle of the westernmost Mediterranean. Tectonophysics 650, 65-79.