De Hoÿm de Marien, L., Janoušek, V., Schulmann, K., Hanžl, P., Míková, J., Hora, J., Racek, M., Lexa, O., Sukhbaatar, T., Burianek, D. and 2025. Middle Devonian–Carboniferous crustal differentiation promoted by hydrous plume-related magmatism along the Paleo-Pacific active margin: A case study of the Gashun Nuur Complex in the Mongolian Altai Gondwana Research.
DOI Google ScholarCLR person interests, research and publications
Researcher
About me
I completed my Master degree and my PhD at the University of Rennes 1 in France. My Master and PhD research focused on the metamorphic evolution of the Variscan belt in France (Pyrenees and Massif Central) by combining petrology and geochronology.
During my post-doc at the Center of Lithospheric Research (started in June 2021) I will pursue my research in metamorphic petrology and the study of the Variscan belt. In the meantime, I will broaden my interest by carrying geochemical investigation and working in the Central Asian Orogenic Belt of Mongolia.
Research interest
- Petrology and thermodynamic modelling of metamorphic rocks.
- Effect of metamorphism on geochronometers.
Research projects
Campaign-style geochronology of pre- to syn-collisional Devonian basins of the Variscan Orogenic Belt
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The Variscan Orogenic Belt developed in response to Devonian-Carboniferous collision between Laurussia and Gondwana and closure of the early Paleozoic Rheic Ocean. Although there is little dispute regarding these large-scale paleogeographic elements a long-lasting and persistent controversy exists regarding the existence, provenance and pre-orogenic distribution of smaller terranes and oceanic basins that occupy the collision zone. Owing to the relatively small size of these elements, their existence cannot be tested by paleomagnetic or paleontological methods.
Principal mechanisms of peripheral continental growth during supercontinent cycle
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The growth of eastern Pangea involves three contrasting orogenic cycles: 1) Baikalian cycle (570-540 Ma) consists of accretion of peri-Rodinian continental, Mirovoi and Panthalassan oceanic fragments to the Siberian margin followed by extensional HT reworking, the growth of magmatic arc, giant accretionary wedge and intraoceanic basin. 2) Altai cycle is typified by crustal thickening followed by syn-extensional melting of the accretionary wedge (420-380 Ma) and the opening of Mongol-Okhotsk ocean.
Pairing extreme metamorphism – A Tale of East Pangea supercontinent assembly
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The construction of East Pangea resulted from amalgamation of the Tarim-North China collage (TNCC), Mongolian collage (MC) and Kazakhstan collage (KC). In the late Paleozoic, the TNCC recorded the interior-type collision between Tarim and the KC and Carboniferous UHP metamorphism in the South Tianshan. Meanwhile, to the north, the Altai orogenic belt (MC) recorded UHT metamorphism associated to back-arc opening between the KC and the MC. However, the corresponding deformational, metamorphic and temporal relationships remain unresolved.
Decoding the lithospheric structure of Central Asia through cluster analysis and geophysical modelling
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This project investigates the lithospheric structure of the Mongolian collage part of the Central Asian Orogenic Belt, shaped by multiple accretion and collision processes. To decode this orogen, we will combine cluster analysis with geophysical inverse and forward modelling to address the occurrence of a felsic relaminant and its extent, and to examine the suture zones and subductions involved in the Mongolian oroclinal bending.
Publications
De Hoÿm de Marien, L., Pitra, P., Poujol, M., Cogné, N., Cagnard, F. and Le Bayon, B. 2023. Complex geochronological record of an emblematic Variscan eclogite (Haut-Allier, French Massif Central) Journal of Metamorphic Geology.
DOI Google ScholarCollett, S., Schulmann, K., Deiller, P., Štípská, P., Peřestý, V., Ulrich, M., Jiang, Y., De Hoÿm de Marien, L. and Míková, J. 2022. Reconstruction of the mid-Devonian HP-HT metamorphic event in the Bohemian Massif (European Variscan belt) Geoscience Frontiers. 13, 101374.
DOI Google ScholarDe Hoÿm de Marien, L., Pitra, P., Cagnard, F. and Le Bayon, B. 2020. Prograde and retrograde P–T evolution of a Variscan high-temperature eclogite, French Massif Central, Haut-Allier BSGF - Earth Sciences Bulletin. 191, 14.
DOI Google ScholarDe Hoÿm de Marien, L., Le Bayon, B., Pitra, P., Van Den Driessche, J., Poujol, M. and Cagnard, F. 2019. Two-stage Variscan metamorphism in the Canigou massif: Evidence for crustal thickening in the Pyrenees Journal of Metamorphic Geology. 37, 863–888.
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