Tim R. Elliott

A novel clustering of down syndrome and coeliac disease complicated by enteritis and small intestinal strictures: a case series

C. R. Kanagasundaram, Joanna Efklides, Elaine Koh, Sarah Ryan et autres

Down syndrome (DS) increases risk for autoimmune conditions, including coeliac disease (CeD). Here, we report five adults with DS and biopsy-proven CeD who developed enteritis and symptomatic small bowel stricturing, a clustering not previously described in this population. All five patients had …

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Controls on Mg isotopic fractionation between deep mantle phases and relict signatures of a terrestrial magma ocean

Andrew M. Walker, Remco C. Hin, Tim R. Elliott

We use density functional theory to investigate the fractionation of Mg isotopes between phases in the lower mantle. Our results support previous work and show that coordination number plays an important role in controlling isotopic fractionation, with bridgmanite (perovskite-structured MgSiO3) preferentially incorporating …

Coupled strontium-calcium isotopes in Archean anorthosites reveal a late start for mantle depletion

Matilda Boyce, Anthony I.S. Kemp, Christopher M. Fisher, Dan Bevan et autres

Abstract Voluminous felsic continental crust is, as far as we know, unique to Earth, yet the timescales of its earliest growth remain debated. Archean mantle evolution is complementary to crustal growth but is largely unconstrained for strontium isotopes due widespread Rb-Sr disturbance. …

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Si isotope composition of Earth’s mantle and oceanic basalts

Xiao-Ning Liu, Martijn Klaver, Remco C. Hin, Christopher D. Coath et autres

We have re-examined mass dependent silicon isotope variations in the terrestrial mantle by exploiting the capability of critical mixture double spiked analyses to measure Si isotope ratios with a reproducibility close to analytical precision (±0.03 ‰ on δ 30/28 Si). Our measurements …

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Assessing the timing of deep ocean oxygenation from uranium elemental and isotopic compositions of ophiolites

Joel B. Rodney, Morten B. Andersen, Daniel Stubbs, C. Johan Lissenberg et autres

The concentration of dissolved oxygen in the deep oceans has varied over Earth History, but the timing of the transition from anoxic to oxic deep oceans is debated. Under modern-day, oxic, deep ocean conditions, alteration of the upper sections of mafic oceanic …

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Constraints from uranium and molybdenum isotope ratios on the origin of enriched mid-ocean ridge basalts

Joel B. Rodney, Morten B. Andersen, Bramley J. Murton, Tim R. Elliott

Most mid-ocean ridge basalts (MORB) are depleted in highly incompatible elements relative to the primitive mantle and are termed normal (N)-MORB. Some MORB, erupted at ridge segments distal from mantle hot-spots, are enriched in incompatible elements. The origin of these enriched (E)-MORB …

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How to assess similarities and differences between mantle circulation models and Earth using disparate independent observations

J. H. Davies, James Panton, Isabella Altoe, Morten B. Andersen et autres

Mantle circulation in the Earth acts to remove heat from its interior and is thus a critical driver of our planet’s internal and surface evolution. Numerical mantle circulation models (MCMs) driven by plate motion history allow us to model relevant physical and …

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Ru and W isotope systematics in ocean island basalts reveals core leakage

Nils Meßling, Matthias Willbold, Leander Kallas, Tim R. Elliott et autres

Abstract The isotopic composition of lavas associated with mantle plumes has previously been interpreted in the light of core–mantle interaction, suggesting that mantle plumes may transport core material to Earth’s surface1–5. However, a definitive fingerprint of Earth’s core in the mantle remains …

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In situ analysis of titanium isotope ratios in stardust using LA-CC-MC-ICPMS/MS

Kathryn M. M. Shaw, Markus Pfeifer, Benjamin L. L. Coath, Jamie Lewis et autres

measurements we can detect the large isotopic excursions in presolar grains without the added impediment of non-solar interference corrections for isobaric interferences.

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Characterising Earth’s surface-to-mantle uranium flux from LA-ICP-MS imaging and bulk rock U isotope ratios of eclogites

Paul Béguelin, Morten B. Andersen, Joel B. Rodney, Tim R. Elliott et autres

Refining the record of terrestrial Pb isotope evolution using in-situ K-feldspar analyses

Nidha Eriyattukuzhiyil, Dan Bevan, Christopher D. Coath, Anthony I.S. Kemp et autres

Tectonic controls on porphyry copper formation in the southwest USA

H. F. Bain, Dan Bevan, Thomas N. Lamont, F. J. Cooper et autres