Jörg Hermann
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View article: Coupled fluorine and hydroxyl incorporation into forsterite
Coupled fluorine and hydroxyl incorporation into forsterite Open
The incorporation mechanism of F and OH in forsterite from a metasomatized marble was investigated by electron probe microanalyzer (EPMA) and Fourier transform infrared (FTIR) spectroscopy. The high-precision EPMA analyses show that the fo…
View article: Experimental hydrogenation of pure and Cr-doped rutile at variable temperature, pressure and oxygen fugacity
Experimental hydrogenation of pure and Cr-doped rutile at variable temperature, pressure and oxygen fugacity Open
Rutile is a nominally anhydrous mineral that can incorporate significant amounts of hydrogen through different trace element related H+-defects. The hydrogen content in rutile has been proposed to be pressure- and redox dependent. To evalu…
View article: Effects of melt depletion and metasomatism on the heat generation in the continental lithospheric mantle below Jagersfontein, South Africa
Effects of melt depletion and metasomatism on the heat generation in the continental lithospheric mantle below Jagersfontein, South Africa Open
Present-day continental lithospheric mantle (CLM) heat production estimates vary considerably and likely overestimate heat generation due to the infiltration of the host magma (i.e., kimberlite), mantle metasomatism or variable heat-produc…
View article: Carbon retention during subduction of ophicarbonate rocks from the Zermatt-Saas unit (Western Alps)
Carbon retention during subduction of ophicarbonate rocks from the Zermatt-Saas unit (Western Alps) Open
Serpentinite-hosted carbonate rocks (i.e., ophicarbonates) are an important rock type for the deep C cycle because they can occur either in the slab or in the mantle wedge. We present a case study of ophicarbonate rocks from the Zermatt-Sa…
View article: Redistribution of heat-producing elements during partial melting of felsic rocks of the lower continental crust, Ivrea Verbano Zone
Redistribution of heat-producing elements during partial melting of felsic rocks of the lower continental crust, Ivrea Verbano Zone Open
The geochemical differentiation of the Earth’s crust is influenced by high-temperature metamorphic processes. Partial melting of the lower continental crust leads to the redistribution of the heat-producing elements (HPEs), which are…
View article: Geochemical characteristics of lower continental crust metasediments: insights from the DIVE Project (5071_1_B, Val d’Ossola, Ivrea-Verbano Zone, Italy)
Geochemical characteristics of lower continental crust metasediments: insights from the DIVE Project (5071_1_B, Val d’Ossola, Ivrea-Verbano Zone, Italy) Open
Our understanding of the Earth's interior - its physical structure, geochemical composition, and dynamic evolution - largely relies on seismic observations, particularly seismic wave velocities. Evidence derived from seismic P-wave velocit…
View article: Carbon Storage and Isotopic Variability in the Deep Crust of the Ivrea-Verbano Zone
Carbon Storage and Isotopic Variability in the Deep Crust of the Ivrea-Verbano Zone Open
The lower continental crust is a critical component of the deep carbon cycle, serving as a long-term reservoir for carbon (C) in the form of residual carbonates and graphite. Yet, the extent of C storage remains poorly understood. The Ivre…
View article: The Archean geological water cycle 
The Archean geological water cycle  Open
The geological water cycle (or the deep water cycle) consists of water-rock interactions between the hydrosphere/atmosphere and lithosphere. This water plays a critical role in geological processes, for example, promoting melting and the f…
View article: High-T quenching microstructures in cauliflower garnet capture instantaneous post-seismic processes in a lower-crustal seismogenic fault
High-T quenching microstructures in cauliflower garnet capture instantaneous post-seismic processes in a lower-crustal seismogenic fault Open
Pristine microstructures preserved in a pseudotachylyte (coseismic-derived quenched frictional melt) are recordkeepers of the time-lapse processes associated with the dynamic rupture propagation and the earthquake slip. Unlocking these nea…
View article: Microscale oxygen isotope tracing of fluid production and circulation in subducted serpentinites 
Microscale oxygen isotope tracing of fluid production and circulation in subducted serpentinites  Open
Dehydration of serpentinites in subduction zones is a major process that releases water at mantle depth. Tracking the dynamics and composition of the fluid produced is a critical step in constructing robust models of subduction processes. …
View article: Hydrogen Zoning in Olivine from Kimberlites Based on Coupled FTIR and SIMS Analyses: Significance for H2O Distribution in the Lithospheric Mantle and H2O Concentrations in Kimberlite Melts
Hydrogen Zoning in Olivine from Kimberlites Based on Coupled FTIR and SIMS Analyses: Significance for H2O Distribution in the Lithospheric Mantle and H2O Concentrations in Kimberlite Melts Open
Kimberlite melts are widely considered to be enriched in volatiles, both CO2 and H2O. Yet, estimated H2O concentrations in primitive kimberlites vary between 3.0 and 12 wt %, and it is unclear whether these variations are a true reflection…
View article: Mechanisms of Aqueous Fluid Infiltration and Redistribution in a Lower‐Crustal Pseudotachylyte‐Bearing Fault
Mechanisms of Aqueous Fluid Infiltration and Redistribution in a Lower‐Crustal Pseudotachylyte‐Bearing Fault Open
Coseismic fracturing in the strong, dry, and metastable plagioclase‐rich lower‐crust is an effective mechanism for creating pathways for fluids to infiltrate the host rock, kick‐start metamorphism, and potentially lead to rheological weake…
View article: Chemical and Isotopic Exchanges in Serpentinites during Hydration and Dehydration Events in the Erro-Tobbio Massif (Italy): from Ocean to Subduction
Chemical and Isotopic Exchanges in Serpentinites during Hydration and Dehydration Events in the Erro-Tobbio Massif (Italy): from Ocean to Subduction Open
Subducted serpentinites are important for recycling water and fluid mobile elements into the deep Earth. Here we present a texturally controlled in situ oxygen and boron isotope and trace element study of the Erro-Tobbio ultramafic rocks (…
View article: Major-Element Geochemistry and Fe3+/ΣFe of Metabasites
Major-Element Geochemistry and Fe3+/ΣFe of Metabasites Open
Metabasites (metamorphosed mafic rocks) are crucial for understanding metamorphic and tectonic processes. Their preservation in exhumed orogenic belts from throughout Earth’s history and the diverse mineral assemblages they form under diff…
View article: A rapid transition from subduction to Barrovian metamorphism: geochronology of mafic–ultramafic relicts of oceanic crust in the Central Alps, Switzerland
A rapid transition from subduction to Barrovian metamorphism: geochronology of mafic–ultramafic relicts of oceanic crust in the Central Alps, Switzerland Open
Relicts of subducted oceanic lithosphere provide key information for the tectonic reconstructions of convergent margins. In the Central Alps, such relicts occur as isolated mafic–ultramafic lenses within the migmatites of the southern Adul…
View article: Experimental constraints on the nature of multiphase solid inclusions and their bearing on mantle wedge metasomatism, Bohemian Massif
Experimental constraints on the nature of multiphase solid inclusions and their bearing on mantle wedge metasomatism, Bohemian Massif Open
This study tests experimentally the hypothesis that calculated bulk compositions of multiphase solid inclusions present in minerals of ultrahigh pressure rocks, can be equated to the composition of the former trapped fluids. We investigate…
View article: Magmatic genesis, hydration, and subduction of the tholeiitic eclogite-facies Allalin gabbro (Western Alps, Switzerland)
Magmatic genesis, hydration, and subduction of the tholeiitic eclogite-facies Allalin gabbro (Western Alps, Switzerland) Open
The Allalin gabbro of the Zermatt-Saas meta-ophiolite consists of variably metamorphosed Mg- to Fe-Ti-gabbros, troctolites, and anorthosites, which are crosscut by basaltic dykes. Field relationships of the various rock types and petrograp…
View article: A workflow and software solution for spatially resolved spectroscopic and numerical data (SpecXY)
A workflow and software solution for spatially resolved spectroscopic and numerical data (SpecXY) Open
Spectroscopic analytical techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Raman or hyperspectral imaging are important in modern geosciences. In recent years there has been a shift from using exclusively single-spot analy…
View article: Variability of lower continental crust constrained by drill core data of the Ivrea Zone (DIVE project DT-1B, Ornavasso, Val d’Ossola, Italy)
Variability of lower continental crust constrained by drill core data of the Ivrea Zone (DIVE project DT-1B, Ornavasso, Val d’Ossola, Italy) Open
The estimates of the chemical composition of the lower continental crust ranges from predominantly mafic to felsic. The Ivrea Zone in the Southern European Alps provides insight into this variability, featuring a pre-Permian mostly felsic …
View article: Deformation and healing processes in the damage zone of a lower-crustal seismogenic fault
Deformation and healing processes in the damage zone of a lower-crustal seismogenic fault Open
In anhydrous, strong, and metastable lower-crustal rocks, coseismic fracturing is an effective mechanism for creating pathways for fluids to infiltrate and interact with the host rock, ultimately resulting in metamorphism and rheological w…
View article: Ophicarbonates transport carbon to the deep mantle: a case study from the Zermatt-Saas ophiolite
Ophicarbonates transport carbon to the deep mantle: a case study from the Zermatt-Saas ophiolite Open
A large body of work has challenged the paradigm of carbonate stability at the forearc and subarc (> 80 km) conditions in subducted slabs and revealed a variety of complex processes that play an important role in the so-called slow C cycle…
View article: The C, H2O and S budget of the deep crust (Ossola Valley, Ivrea-Verbano Zone)
The C, H2O and S budget of the deep crust (Ossola Valley, Ivrea-Verbano Zone) Open
The deep crust in the Ivrea-Verbano zone consists of underplated mafic and metasedimentary rocks. In the metasedimentary rocks, C in the form of residual carbonates and graphite, H2O in hydrous phases and S in sulphides can potentially be …
View article: Tracing modern-style cold subduction in the Proterozoic – evidence from H2O and trace elements in detrital rutile
Tracing modern-style cold subduction in the Proterozoic – evidence from H2O and trace elements in detrital rutile Open
To understand the onset and evolution of cold subduction on Earth, detrital sedimentary rocks of Precambrian age, potentially derived from exposed high-P low-T metamorphic rocks can be investigated. This requires the estimation of peak met…
View article: The geological record of H2 production in the Archean
The geological record of H2 production in the Archean Open
The oxidation of iron from rocks during subaqueous alteration is a key source of the molecular hydrogen (H2) used as an energy source by chemosynthetic organisms, which may represent some of the earliest forms of life on Earth. In the Arch…
View article: H2O-rich rutile as an indicator for modern-style cold subduction
H2O-rich rutile as an indicator for modern-style cold subduction Open
The trace-element and isotope geochemistry of rutile are robust tools to determine metamorphic temperatures, age, and host-/source lithologies. The use of rutile as single grain indicator for pressure, temperature, time and composition (P–…