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Multi-stage subduction-related metasomatism recorded in whiteschists from the Dora-Maira Massif, Western Alps (2023)
Journal Article
Harris, B. J. R., De Hoog, J. C. M., Halama, R., Schertl, H., & Chen, Y. (2023). Multi-stage subduction-related metasomatism recorded in whiteschists from the Dora-Maira Massif, Western Alps. Contributions to Mineralogy and Petrology, 178(11), Article 76. https://doi.org/10.1007/s00410-023-02058-0

Whiteschists from the Dora-Maira massif (Western Alps, Italy) are Mg and K-rich metasomatised granites which experienced ultra-high pressure metamorphism and fluid-rock interaction during Alpine continental subduction. The sources and timing of fluid... Read More about Multi-stage subduction-related metasomatism recorded in whiteschists from the Dora-Maira Massif, Western Alps.

Discrimination of thermodynamic and kinetic contributions to the heavy rare earth element patterns in metamorphic garnet (2022)
Journal Article
Konrad‐Schmolke, M., Halama, R., Chew, D., Heuzé, C., De Hoog, J., & Ditterova, H. (2022). Discrimination of thermodynamic and kinetic contributions to the heavy rare earth element patterns in metamorphic garnet. Journal of Metamorphic Geology, 41(4), 465-490. https://doi.org/10.1111/jmg.12703

Variations of rare earth element (REE) concentrations in metamorphic garnet are an important source of information of geodynamic and geochemical processes in the deeper Earth. In order to extract this information, the thermodynamic equilibrium and ki... Read More about Discrimination of thermodynamic and kinetic contributions to the heavy rare earth element patterns in metamorphic garnet.

The behaviour of nitrogen during subduction of oceanic crust: insights from in situ SIMS analyses of high-pressure rocks (2022)
Journal Article
Halama, R., Harris, B., & De Hoog, J. (2022). The behaviour of nitrogen during subduction of oceanic crust: insights from in situ SIMS analyses of high-pressure rocks. Geochimica et Cosmochimica Acta, 16-34. https://doi.org/10.1016/j.gca.2022.01.018

Understanding the Earth’s geological nitrogen (N) cycle requires an understanding of how N behaves during dehydration of subducted crust. We present the first in situ measurements of N in silicate minerals by secondary ion mass spectrometry, focusing... Read More about The behaviour of nitrogen during subduction of oceanic crust: insights from in situ SIMS analyses of high-pressure rocks.

Nitrogen loss and isotopic fractionation during granulite-facies metamorphism in the lower crust (Ivrea Zone, NW Italy) (2021)
Journal Article
Halama, R., Bebout, G., & Bea, F. (2021). Nitrogen loss and isotopic fractionation during granulite-facies metamorphism in the lower crust (Ivrea Zone, NW Italy). Chemical Geology, 120475 - 120475. https://doi.org/10.1016/j.chemgeo.2021.120475

The Ivrea Zone, exposed in the Southern Alps, affords an examination of nitrogen mobilization and storage in deep continental crust, in rocks spanning the amphibolite to granulite facies transition and that experienced multiple devolatilization react... Read More about Nitrogen loss and isotopic fractionation during granulite-facies metamorphism in the lower crust (Ivrea Zone, NW Italy).

Earth’s Nitrogen and Carbon Cycles (2021)
Journal Article
Halama, R., Bebout, . G., & Bebout, G. (2021). Earth’s Nitrogen and Carbon Cycles. Space Science Reviews, 217, Article 45. https://doi.org/10.1007/s11214-021-00826-7

Understanding the Earth’s geological nitrogen (N) and carbon (C) cycles is fundamental for assessing the distribution of these volatiles between solid Earth (core, mantle and crust), oceans and atmosphere. This Special Communication about the Earth’s... Read More about Earth’s Nitrogen and Carbon Cycles.

Tourmaline reference materials for the in situ analysis of oxygen and lithium isotope ratio compositions (2020)
Journal Article
Wiedenbeck, M., Trumbull, R., Rosner, M., Boyce, A., Fournelle, J., Franchi, I., …Wilke, F. (2020). Tourmaline reference materials for the in situ analysis of oxygen and lithium isotope ratio compositions. Geostandards and Geoanalytical Research, https://doi.org/10.1111/ggr.12362

Three tourmaline reference materials sourced from the Harvard Mineralogical and Geological Museum (schorl 112566, dravite 108796 and elbaite 98144), which are already widely used for the calibration of in situ boron isotope measurements, are characte... Read More about Tourmaline reference materials for the in situ analysis of oxygen and lithium isotope ratio compositions.

Deciphering the Jurassic–Cretaceous evolution of the Hamadan metamorphic complex during Neotethys subduction, western Iran (2020)
Journal Article
Halama. (2020). Deciphering the Jurassic–Cretaceous evolution of the Hamadan metamorphic complex during Neotethys subduction, western Iran. International Journal of Earth Sciences, https://doi.org/10.1007/s00531-020-01893-x

The Hamadan high-grade metapelites in the northwestern part of the Sanandaj–Sirjan zone, Iran, show a polymetamorphic evolution with relics of a garnet-bearing metamorphic mineral assemblage (M1), a contact metamorphic overprint (M2) related to the e... Read More about Deciphering the Jurassic–Cretaceous evolution of the Hamadan metamorphic complex during Neotethys subduction, western Iran.

Pinched between the plates: Armenia's voluminous record of volcanic activity (2020)
Journal Article
Halama, R., Meliksetian, K., Savov, I., Sugden, P., & Sokół, K. (2020). Pinched between the plates: Armenia's voluminous record of volcanic activity. Geology Today, 101 - 108. https://doi.org/10.1111/gto.12309

Located in the heart of the Lesser Caucasus mountains, where the Arabian and Eurasian tectonic plates collide, Armenia occupies an exceptional geological position shaped through millions of years of subduction and collision. It is a unique place on t... Read More about Pinched between the plates: Armenia's voluminous record of volcanic activity.

Barium isotopic composition of the mantle: Constraints from carbonatites (2020)
Journal Article
Li, W., Yu, H., Xu, J., Halama, R., Bell, K., Nan, X., & Huang, F. (2020). Barium isotopic composition of the mantle: Constraints from carbonatites. Geochimica et Cosmochimica Acta, 235-243. https://doi.org/10.1016/j.gca.2019.06.041

To investigate the behaviour of Ba isotopes during carbonatite petrogenesis and to explore the possibility of using carbonatites to constrain the Ba isotopic composition of the mantle, we report high-precision Ba isotopic analyses of: (1) carbonatite... Read More about Barium isotopic composition of the mantle: Constraints from carbonatites.

Insights into the magma plumbing system of La Fossa di Vulcano (Aeolian Islands, Italy) using oxygen isotopes and clinopyroxene crystal structure (2020)
Journal Article
Wiltshire, R., Halama, R., Boyce, A., Petrone, C., Nazzareni, S., Gertisser, R., …Lucchi, F. (2020). Insights into the magma plumbing system of La Fossa di Vulcano (Aeolian Islands, Italy) using oxygen isotopes and clinopyroxene crystal structure. https://doi.org/10.5194/egusphere-egu2020-13433

<p>The presently active La Fossa cone, Vulcano, widely considered the most hazardous volcano in the Aeolian Islands, is characterised by alternating periods of Vulcanian to subplinian explosive events and lava flow effusion. It has for... Read More about Insights into the magma plumbing system of La Fossa di Vulcano (Aeolian Islands, Italy) using oxygen isotopes and clinopyroxene crystal structure.

Magmatic and metasomatic effects of magma-carbonate interaction recorded in calc-silicate xenoliths from Merapi volcano (Indonesia) (2020)
Journal Article
Halama, R., Gertisser, R., Whitley, S., Preece, K., Deegan, F., & Troll, V. (2020). Magmatic and metasomatic effects of magma-carbonate interaction recorded in calc-silicate xenoliths from Merapi volcano (Indonesia). Journal of Petrology, https://doi.org/10.1093/petrology/egaa048

Magma-carbonate interaction is an increasingly recognised process occurring at active volcanoes worldwide, with implications for the magmatic evolution of the host volcanic systems, their eruptive behaviour, volcanic CO2 budgets, and economic mineral... Read More about Magmatic and metasomatic effects of magma-carbonate interaction recorded in calc-silicate xenoliths from Merapi volcano (Indonesia).

Boron isotope insights into the origin of subduction signatures in continent-continent collision zone volcanism (2020)
Journal Article
Sugden, P., Savov, I., Agostini, S., Wilson, M., Halama, R., & Meliksetian, K. (2020). Boron isotope insights into the origin of subduction signatures in continent-continent collision zone volcanism. Earth and Planetary Science Letters, https://doi.org/10.1016/j.epsl.2020.116207

We present the first boron abundance and delta B-11 data for young (1.5-0 Ma) volcanic rocks formed in an active continent-continent collision zone. The delta B-11 of post-collisional volcanic rocks (-5 to +2 parts per thousand) from the Armenian sec... Read More about Boron isotope insights into the origin of subduction signatures in continent-continent collision zone volcanism.

Boron isotope record of peak metamorphic ultrahigh-pressure and retrograde fluid-rock interaction in white mica (Lago di Cignana, Western Alps) (2020)
Journal Article
Halama, Konrad-Schmolke, M., & De Hoog, J. (2020). Boron isotope record of peak metamorphic ultrahigh-pressure and retrograde fluid-rock interaction in white mica (Lago di Cignana, Western Alps). Contributions to Mineralogy and Petrology, https://doi.org/10.1007/s00410-020-1661-8

This study presents boron (B) concentration and isotope data for white mica from (ultra)high-pressure (UHP), subduction-related metamorphic rocks from Lago di Cignana (Western Alps, Italy). These rocks are of specific geological interest, because the... Read More about Boron isotope record of peak metamorphic ultrahigh-pressure and retrograde fluid-rock interaction in white mica (Lago di Cignana, Western Alps).

Crustal CO2 contribution to subduction zone degassing recorded through calc-silicate xenoliths in arc lavas (2019)
Journal Article
Whitley, S., Gertisser, R., Halama, R., Preece, K., R. Troll, V., & M. Deegan, F. (2019). Crustal CO2 contribution to subduction zone degassing recorded through calc-silicate xenoliths in arc lavas. Scientific reports, https://doi.org/10.1038/s41598-019-44929-2

Interaction between magma and crustal carbonate at active arc volcanoes has recently been proposed as a source of atmospheric CO2, in addition to CO2 released from the mantle and subducted oceanic crust. However, quantitative constraints on efciency... Read More about Crustal CO2 contribution to subduction zone degassing recorded through calc-silicate xenoliths in arc lavas.

The Thickness of the Mantle Lithosphere and Collision-related Volcanism in the Lesser Caucasus (2019)
Journal Article
Sugden, P., Savov, I., Wilson, M., Meliksetian, K., Navasardyan, G., & Halama, R. (2019). The Thickness of the Mantle Lithosphere and Collision-related Volcanism in the Lesser Caucasus. Journal of Petrology, 199-230. https://doi.org/10.1093/petrology/egy111

The Lesser Caucasus mountains sit on a transition within the Arabia-Eurasia collision zone between very thin lithosphere (< 100?km) to the west, under Eastern Anatolia, and a very thick lithospheric root (up to 200?km) in the east, under western Iran... Read More about The Thickness of the Mantle Lithosphere and Collision-related Volcanism in the Lesser Caucasus.

Alkaline magmas in zones of continental convergence: The Tezhsar volcano-intrusive ring complex, Armenia (2018)
Journal Article
Sokol, K., Halama, R., Meliksetian, K., Savov, I., Navasardyan, G., & Sudo, M. (2018). Alkaline magmas in zones of continental convergence: The Tezhsar volcano-intrusive ring complex, Armenia. Lithos, 172-191. https://doi.org/10.1016/j.lithos.2018.08.028

Alkaline igneous rocks are relatively rare in settings of tectonic convergence and little is known about their petrogenesis in these settings. This study aims to contribute to a better understanding of the formation of alkaline igneous rocks by an in... Read More about Alkaline magmas in zones of continental convergence: The Tezhsar volcano-intrusive ring complex, Armenia.

Rb-Sr and in situ 40Ar/39Ar dating of exhumation-related shearing and fluid-induced recrystallization in the Sesia zone (Western Alps, Italy) (2018)
Journal Article
Konrad-Schmolke, M., Sudo, M., Halama, R., & Glodny, J. (2018). Rb-Sr and in situ 40Ar/39Ar dating of exhumation-related shearing and fluid-induced recrystallization in the Sesia zone (Western Alps, Italy). Geosphere, 1425-1450. https://doi.org/10.1130/GES01521.1

The Sesia zone in the Italian Western Alps is a piece of continental crust that has been subducted to eclogite-facies conditions and records a complex metamorphic history. The exact timing of events and the significance of geochronological informatio... Read More about Rb-Sr and in situ 40Ar/39Ar dating of exhumation-related shearing and fluid-induced recrystallization in the Sesia zone (Western Alps, Italy).

Mineral dissolution and reprecipitation mediated by an amorphous phase (2018)
Journal Article
Schreiber, A., Wilke, F., Klitscher, N., Morales, L., Wirth, R., Thomen, A., …Halama, R. (2018). Mineral dissolution and reprecipitation mediated by an amorphous phase. Nature communications, 1637 -1637. https://doi.org/10.1038/s41467-018-03944-z

Fluid-mediated mineral dissolution and reprecipitation processes are the most common mineral reaction mechanism in the solid Earth and are fundamental for the Earth’s internal dynamics. Element exchange during such mineral reactions is commonly thoug... Read More about Mineral dissolution and reprecipitation mediated by an amorphous phase.

Fluid-induced breakdown of white mica controls nitrogen transfer during fluid-rock interaction in subduction zones (2016)
Journal Article
Halama, R., Bebout, G., Marschall, H., & John, T. (2016). Fluid-induced breakdown of white mica controls nitrogen transfer during fluid-rock interaction in subduction zones. International Geology Review, 702-720. https://doi.org/10.1080/00206814.2016.1233834

In order to determine the effects of fluid–rock interaction on nitrogen elemental and isotopic systematics in high-pressure metamorphic rocks, we investigated three different profiles representing three distinct scenarios of metasomatic overprinting.... Read More about Fluid-induced breakdown of white mica controls nitrogen transfer during fluid-rock interaction in subduction zones.