Search Results - "Marschall, Horst"

Arc magmas sourced from mélange diapirs in subduction zones by Marschall, Horst R., Schumacher, John C.

“…At subduction zones, crustal material enters the mantle. Some of this material, however, is returned to the overriding plate through volcanic and plutonic…”
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Hygrochronometry of punctuated metasomatic events during exhumation of the Cycladic blueschist unit (Syros, Greece) by Gyomlai, Thomas, Agard, Philippe, Marschall, Horst R., Jolivet, Laurent

“…The spatiotemporal scales at which fluid flow events occur along the subduction interface remain poorly constrained. This study illustrates the benefit of…”
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Geochemical evidence for mélange melting in global arcs by Nielsen, Sune G, Marschall, Horst R

“…In subduction zones, sediments and hydrothermally altered oceanic crust, which together form part of the subducting slab, contribute to the chemical…”
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Diffusion-induced fractionation of niobium and tantalum during continental crust formation by Marschall, Horst R., Dohmen, Ralf, Ludwig, Thomas

“…Differentiation of the Earth into its major spheres – crust, mantle and core – has proceeded dominantly through magmatic processes involving melting and melt…”
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Early accretion of water in the inner solar system from a carbonaceous chondrite–like source by Sarafian, Adam R., Nielsen, Sune G., Marschall, Horst R., McCubbin, Francis M., Monteleone, Brian D.

“…Determining the origin of water and the timing of its accretion within the inner solar system is important for understanding the dynamics of planet formation…”
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Variations of Li and Mg isotope ratios in bulk chondrites and mantle xenoliths by Pogge von Strandmann, Philip A.E., Elliott, Tim, Marschall, Horst R., Coath, Chris, Lai, Yi-Jen, Jeffcoate, Alistair B., Ionov, Dmitri A.

“…We present whole rock Li and Mg isotope analyses of 33 ultramafic xenoliths from the terrestrial mantle, which we compare with analyses of 30 (mostly…”
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The Age of Granulite-Facies Metamorphism in the Ivrea–Verbano Zone (NW Italy) Determined Through In Situ U–Pb Dating of Garnet by Bartoli, Omar, Millonig, Leo J, Carvalho, Bruna B, Marschall, Horst R, Gerdes, Axel

“…Abstract Rates of melt production, extraction and crystallization, as well as scales of melt transfer and interaction with their residuum change continuously…”
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Diffusion of Zr, Hf, Nb and Ta in rutile: effects of temperature, oxygen fugacity, and doping level, and relation to rutile point defect chemistry by Dohmen, Ralf, Marschall, Horst R., Ludwig, Thomas, Polednia, Joana

“…We performed experiments with thin film diffusion couples to simultaneously measure diffusion coefficients of Zr, Hf, Nb and Ta parallel to the a- and c-axes…”
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Prolonged Ediacaran–Cambrian Metamorphic History and Short-lived High-pressure Granulite-facies Metamorphism in the H.U. Sverdrupfjella, Dronning Maud Land (East Antarctica): Evidence for Continental Collision during Gondwana Assembly by Pauly, Jim, Marschall, Horst R, Meyer, Hans-Peter, Chatterjee, Nilanjan, Monteleone, Brian

“…The H.U. Sverdrupfjella is part of the high-grade Maud Belt in Dronning Maud Land (East Antarctica), which was located in a central position of the Gondwana…”
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Early accretion of water and volatile elements to the inner Solar System: evidence from angrites by Sarafian, Adam R., Hauri, Erik H., McCubbin, Francis M., Lapen, Thomas J., Berger, Eve L., Nielsen, Sune G., Marschall, Horst R., Gaetani, Glenn A., Righter, Kevin, Sarafian, Emily

“…Inner Solar System bodies are depleted in volatile elements relative to chondrite meteorites, yet the source(s) and mechanism(s) of volatile-element depletion…”
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Questioning Fe isotopes as a provenance tool: Insights from bog iron ores and alternative applications in archeometry by Rose, Thomas, Télouk, Philippe, Klein, Sabine, Marschall, Horst R.

“…Provenancing metal artifacts with scientific methods is an established tool in archeometry to identify the metal deposits, which were exploited for the…”
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Mid-ocean Ridge Serpentinite in the Puerto Rico Trench: from Seafloor Spreading to Subduction by Klein, Frieder, Marschall, Horst R, Bowring, Samuel A, Humphris, Susan E, Horning, Gregory

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Assessment of Chalk as an Archive for the Lithium Isotope Composition of Seawater by Huber, Sandra J., Schlidt, Vanessa, Seitz, H.‐Michael, Kniest, Jorit F., Raddatz, Jacek, Marschall, Horst R., Voigt, Silke

“…The understanding of silicate weathering and its role as a sink for atmospheric CO2 is important to get a better insight into how the Earth shifts from warm to…”
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Tourmaline; an ideal indicator of its host environment by van Hinsberg, Vincent J, Henry, Darrell J, Marschall, Horst R

“…Tourmaline-supergroup minerals are ubiquitous accessory minerals in rocks of the Earth's crust. They can adjust their composition to suit a wide variety of…”
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Young magmatism and Si‐rich melts on Mars as documented in the enriched gabbroic shergottite NWA 6963 by Lindner, Miles, Hezel, Dominik C., Gerdes, Axel, Marschall, Horst R., Brenker, Frank E.

“…Enriched shergottites contain interstitial Si‐rich mesostasis; however, it is unclear whether such mesostasis is formed by impact or magmatic processes. We use…”
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Trace element systematics of tourmaline in pegmatitic and hydrothermal systems from the Variscan Schwarzwald (Germany): The importance of major element composition, sector zoning, and fluid or melt composition by Marks, Michael A.W., Marschall, Horst R., Schühle, Philipp, Guth, Anna, Wenzel, Thomas, Jacob, Dorrit E., Barth, Matthias, Markl, Gregor

“…An extensive data set on the compositional variation of tourmaline from granitic pegmatites, from migmatitic gneisses and from various types of hydrothermal…”
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Fluid-induced breakdown of white mica controls nitrogen transfer during fluid-rock interaction in subduction zones by Halama, Ralf, Bebout, Gray E., Marschall, Horst R., John, Timm

“…In order to determine the effects of fluid-rock interaction on nitrogen elemental and isotopic systematics in high-pressure metamorphic rocks, we investigated…”
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Boron Isotope Analysis of Silicate Glass with Very Low Boron Concentrations by Secondary Ion Mass Spectrometry by Marschall, Horst R., Monteleone, Brian D.

“…We present an improved method for the determination of the boron isotopic composition of volcanic glasses with boron concentrations of as low as 0.4–2.5 μg…”
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Experimental boron isotope fractionation between tourmaline and fluid: confirmation from in situ analyses by secondary ion mass spectrometry and from Rayleigh fractionation modelling by Marschall, Horst R., Meyer, Christian, Wunder, Bernd, Ludwig, Thomas, Heinrich, Wilhelm

“…Tourmaline synthesised in an experiment with low boron excess was analysed in situ by secondary ion mass spectrometry. It revealed significant B isotope…”
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The boron and lithium isotopic composition of mid-ocean ridge basalts and the mantle by Marschall, Horst R., Wanless, V. Dorsey, Shimizu, Nobumichi, Pogge von Strandmann, Philip A.E., Elliott, Tim, Monteleone, Brian D.

“…A global selection of 56 mid-ocean ridge basalt (MORB) glasses were analysed for Li and B abundances and isotopic compositions. Analytical accuracy and…”
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