Search Results - "Sonja Aulbach"

Evidence for oxygen-conserving diamond formation in redox-buffered subducted oceanic crust sampled as eclogite by Aulbach, Sonja, Stachel, Thomas

“…Cratonic eclogite is the product of oceanic crust subduction into the subcontinental lithospheric mantle, and it also is a fertile diamond source rock. In…”
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Major- and trace-elements in cratonic mantle eclogites and pyroxenites reveal heterogeneous sources and metamorphic processing of low-pressure protoliths by Aulbach, Sonja, Jacob, Dorrit E.

“…There is a growing body of evidence for the origin of cratonic mantle eclogite xenoliths by low-pressure formation in now-recycled ocean floors. Because they…”
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Origins of cratonic mantle discontinuities: A view from petrology, geochemistry and thermodynamic models by Aulbach, Sonja, Massuyeau, Malcolm, Gaillard, Fabrice

“…Geophysically detectible mid-lithospheric discontinuities (MLD) and lithosphere-asthenosphere boundaries (LAB) beneath cratons have received much attention…”
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Ultramafic Carbonated Melt‐ and Auto‐Metasomatism in Mantle Eclogites: Compositional Effects and Geophysical Consequences by Sonja Aulbach, Malcolm Massuyeau, Joshua M. Garber, Axel Gerdes, Larry M. Heaman, K.S. Viljoen

“…Abstract The mineralogy, chemical composition, and physical properties of cratonic mantle eclogites with oceanic crustal protoliths can be modified by…”
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Water in Omphacite and Garnet From Pristine Xenolithic Eclogite: T‐X‐fO2 Controls, Retentivity, and Implications for Electrical Conductivity and Deep H2O Recycling by Aulbach, Sonja, Stalder, Roland, Massuyeau, Malcolm, Stern, Richard A., Ionov, Dmitri A., Korsakov, Andrey V.

“…Kimberlite‐borne eclogite xenoliths having Precambrian oceanic crustal protoliths and entrained from ≥100 km depth can retain pristine geochemical features…”
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Evidence for a dominantly reducing Archaean ambient mantle from two redox proxies, and low oxygen fugacity of deeply subducted oceanic crust by Aulbach, Sonja, Woodland, Alan B., Stern, Richard A., Vasilyev, Prokopiy, Heaman, Larry M., Viljoen, K. S.

“…Oxygen fugacity (ƒO 2 ) is an intensive variable implicated in a range of processes that have shaped the Earth system, but there is controversy on the timing…”
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Cubic Fe-bearing majorite synthesized at 18–25 GPa and 1000 °C: implications for element transport, subducted slab rheology and diamond formation by Stagno, Vincenzo, Bindi, Luca, Bonechi, Barbara, Greaux, Steeve, Aulbach, Sonja, Irifune, Tetsuo, Lupi, Stefano, Marras, Giulia, McCammon, Catherine A., Nazzari, Manuela, Piccirilli, Federica, Poe, Brent, Romano, Claudia, Scarlato, Piergiorgio

“…The chemistry and mineralogy of slabs subducted into lower mantle control slab rheology and impact the deep volatile cycle. It is known that the metamorphism…”
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Origins of non-equilibrium lithium isotopic fractionation in xenolithic peridotite minerals: Examples from Tanzania by Aulbach, Sonja, Rudnick, Roberta L.

“…Olivine, clinopyroxene and orthopyroxene in variably metasomatised peridotite xenoliths from three lithospheric mantle sections beneath the East African Rift…”
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Lithospheric mantle refertilization by DMM-derived melts beneath the Cameroon Volcanic Line—a case study of the Befang xenolith suite (Oku Volcanic Group, Cameroon) by Tedonkenfack, Sylvin S. T., Puziewicz, Jacek, Aulbach, Sonja, Ntaflos, Theodoros, Kaczmarek, Mary-Alix, Matusiak-Małek, Magdalena, Kukuła, Anna, Ziobro, Małgorzata

“…The origin and evolution of subcontinental lithospheric mantle (SCLM) are important issues of Earth’s chemical and physical evolution. Here, we report detailed…”
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Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite by Denis Mikhailenko, Alexander Golovin, Andrey Korsakov, Sonja Aulbach, Axel Gerdes, Alexey Ragozin

“…A coesite-bearing diamondiferous eclogite from the Udachnaya kimberlite (Daldyn field, Siberian craton) has been studied to trace its complex evolution…”
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Origins of Xenolithic Eclogites and Pyroxenites from the Central Slave Craton, Canada by Aulbach, Sonja, Pearson, Norman J., O'Reilly, Suzanne Y., Doyle, Buddy J.

“…Major- and trace-element and Sr–Nd–Hf isotopic compositions of garnet and clinopyroxene in kimberlite-borne eclogite and pyroxenite xenoliths were used to…”
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Constraints from eclogite and MARID xenoliths on origins of mantle Zr/Hf–Nb/Ta variability by Aulbach, Sonja, O’Reilly, Suzanne Y., Pearson, Norman J.

“…New trace-element data of rutile in kimberlite-borne ~1.85 Ga eclogite and pyroxenite xenoliths from the central Slave craton, as well as ~110 Ma MARID…”
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Lithium isotope analysis of olivine by SIMS: Calibration of a matrix effect and application to magmatic phenocrysts by Bell, David R., Hervig, Richard L., Buseck, Peter R., Aulbach, Sonja

“…High-spatial resolution analysis of light element isotope variations by secondary-ion mass spectrometry (SIMS) has numerous applications in geochemistry and…”
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Temperature-dependent Rutile Solubility in Garnet and Clinopyroxene from Mantle Eclogite: Implications for Continental Crust Formation and V-based Oxybarometry by Aulbach, Sonja

“…Abstract Despite its accessory mineral status in metabasaltic rocks, rutile controls the whole-rock Ti, Nb and Ta budget. These are key elements used to trace…”
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The trace element composition of silicate inclusions in diamonds: a review by Stachel, Thomas, Aulbach, Sonja, Brey, Gerhard P., Harris, Jeff W., Leost, Ingrid, Tappert, Ralf, Viljoen, K.S.(Fanus)

“…On a global scale, peridotitic garnet inclusions in diamonds from the subcratonic lithosphere indicate an evolution from strongly sinusoidal REE N, typical for…”
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Mantle formation and evolution, Slave Craton: constraints from HSE abundances and Re–Os isotope systematics of sulfide inclusions in mantle xenocrysts by Aulbach, Sonja, Griffin, William L., Pearson, Norman J., O'Reilly, Suzanne Y., Kivi, Kevin, Doyle, Buddy J.

“…Major elements, trace elements including highly siderophile elements (HSE) and Re–Os isotope ratios were analysed in situ on individual sulfide grains and one…”
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Craton nucleation and formation of thick lithospheric roots by Aulbach, Sonja

“…Cratonisation is regarded as coincident with amalgamation and lithosphere thickening during collisional tectonics, leading to the birth of the cratonic…”
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Eclogites as palaeodynamic archives: Evidence for warm (not hot) and depleted (but heterogeneous) Archaean ambient mantle by Aulbach, Sonja, Arndt, Nicholas T.

“…Some high-Mg eclogite xenoliths, entrained by kimberlites from the mantle lithospheres of ancient continental cores, and rare orogenic eclogites and…”
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Origin of high-Mg bimineralic eclogite xenoliths in kimberlite – reply to comment from Claude Herzberg by Aulbach, Sonja, Arndt, Nicholas T.

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Elemental and radiogenic isotope perspective on formation and transformation of cratonic lower crust: Central Slave craton (Canada) by Aulbach, Sonja, Symes, Cristen, Chacko, Thomas

“…Kimberlite-borne granulite xenoliths provide rare insights into the age, chemical composition and tectonothermal evolution of the otherwise largely…”
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