Helen M. Williams

Geothermometry calculations for pyroxenite and chromitite samples from MG1 chromitite layer from the Bushveld Complex, South Africa (v2)

Capucine Albert, Felix Kaufmann, Lutz Hecht, Katrina Nilsson-Kerr et autres

Equilibration temperatures calculated from olivine-spinel equilibria (Ballhaus et al., 1991). Temperatures for opx-spinel equilibria (Liermann & Ganguly, 2003) and opx-cpx equilibria (Brey & Kohler, 1990) were added to the v2 of this dataset. P = 0.3 GPa was used as estimated pressure …

Giant iceberg behaviour impacts regional biogeochemical cycling in the Southern Ocean

L Taylor, Helena Pryer, Katharine Hendry, Rachael Sanders et autres

Giant Antarctic iceberg calving is projected to increase with climate change, affecting ocean circulation, nutrient supply, and carbon cycling. These icebergs can stimulate primary production and influence Southern Ocean carbon fluxes through modification of upper ocean physics and biogeochemistry, yet the underlying …

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Provenance and distribution of zinc in terrestrial planets

Rayssa Martins, Elin M. Morton, Yihang Huang, Helen M. Williams et autres

The nucleosynthetic Zn isotope compositions of planetary materials shed light on the sources of Zn and other similarly volatile elements during terrestrial planet formation. Previous results for Earth revealed that it acquired its Zn inventory primarily from primitive, undifferentiated bodies originating from …

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Rare earth element nucleosynthetic anomalies and dust transport in the protoplanetary disk

Justin Y. Hu, François Tissot, R. T. C. Marquez, Oliver Shorttle et autres

The size, density, and chemical characteristics of solar system bodies have been shaped by material transport during the protoplanetary disk stage. This includes transport from the inner to outer solar system of refractory dust grains that carry nucleosynthetic anomalies. Here, we show …

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Evaluating the Effects of Thermal Processing on Nucleosynthetic Zinc Isotope Variations: Insights from Carbonaceous Chondrites Leachates

Rayssa Martins, Elin M. Morton, Alessandro Bragagni, Helen M. Williams et autres

Abstract Variations in the nucleosynthetic isotope compositions of meteorites have been suggested to result from variable destruction of some presolar grains through thermal processing. This mechanism has furthermore been linked to volatile depletion in chondritic meteorites. As a moderately volatile element with …

Provenance and distribution of zinc in terrestrial planets

Rayssa Martins, Elin M. Morton, Yihang Huang, Helen M. Williams et autres

gb (code pays fourni par la source)

Flood Resilience Through Impervious Area Reduction Strategies: Mapping Knowledge, Trends, and Structure Through Bibliometric Analysis

Funmilayo Ebun Rotimi, Roohollah Kalatehjari, Helen M. Williams, George Okyere Dokyi et autres

nz (code pays fourni par la source)

Diverse petrogenesis of Neoarchean TTGs revealed by titanium stable isotopes

Laura Spencer, Helen M. Williams, Oliver Nebel, I. J. Parkinson et autres

Probing Melt Transport Processes with Heavy Stable Isotopes

Sara Crozier, Helen M. Williams, Oliver Shorttle, Simon Matthews

Exploring the Isotopic Variation of Germanium in Earth’s mantle

Qasid Ahmad, Béatrice Luais, Damien Cividini, Caroline Soderman et autres

International audience

Iron Isotopes reveal volcanogenic input during Oceanic Anoxic Event 2 (OAE 2 ∼ 94 Ma)

Lucien Nana Yobo, Helen M. Williams, A. D. Brandon, Chris Holmden et autres

Anomalously high metal concentrations including iron enrichments are recorded in marine carbonates deposited during Ocean Anoxic Event 2 (OAE 2). These metal enrichments have been attributed to massive submarine eruptions during the formation of one or more large igneous provinces, the proposed …

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Tracing hydrous eclogite melts in the source of sanukitoids

Laura Spencer, Capucine Albert, Helen M. Williams, Oliver Nebel et autres

International audience

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