Search Results - "Shirey, Steven B."

Start of the Wilson Cycle at 3 Ga Shown by Diamonds from Subcontinental Mantle by Shirey, Steven B., Richardson, Stephen H.

“…Mineral inclusions encapsulated in diamonds are the oldest, deepest, and most pristine samples of Earth's mantle. They provide age and chemical information…”
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Large gem diamonds from metallic liquid in Earth's deep mantle by Smith, Evan M., Shirey, Steven B., Nestola, Fabrizio, Bullock, Emma S., Wang, Jianhua, Richardson, Stephen H., Wang, Wuyi

“…The redox state of Earth's convecting mantle, masked by the lithospheric plates and basaltic magmatism of plate tectonics, is a key unknown in the evolutionary…”
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Blue boron-bearing diamonds from Earth’s lower mantle by Smith, Evan M., Shirey, Steven B., Richardson, Stephen H., Nestola, Fabrizio, Bullock, Emma S., Wang, Jianhua, Wang, Wuyi

“…Geological pathways for the recycling of Earth’s surface materials into the mantle are both driven and obscured by plate tectonics 1 – 3 . Gauging the extent…”
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Sulfur isotopes in diamonds reveal differences in continent construction by Smit, Karen V, Shirey, Steven B, Hauri, Erik H, Stern, Richard A

“…Neoproterozoic West African diamonds contain sulfide inclusions with mass-independently fractionated (MIF) sulfur isotopes that trace Archean surficial…”
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Redox controls on Ni–Fe–PGE mineralization and Re/Os fractionation during serpentinization of abyssal peridotite by Foustoukos, Dionysis I., Bizimis, Michael, Frisby, Carl, Shirey, Steven B.

“…Awaruite (Ni2Fe to Ni3Fe) is often used to infer fugacity and redox gradients in hydrothermally altered peridotites. However, discrepant petrological and…”
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Continental mantle signature of Bushveld magmas and coeval diamonds by Richardson, Stephen H, Shirey, Steven B

“…The emplacement of the 2.05-billion-year-old Bushveld complex, the world's largest layered intrusion and platinum-group element (PGE) repository, is a singular…”
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Distinguishing Plume and Metasomatized Lithospheric Mantle Contributions to Post-Flood Basalt Volcanism on the Southeastern Ethiopian Plateau by Nelson, Wendy R, Hanan, Barry B, Graham, David W, Shirey, Steven B, Yirgu, Gezahegn, Ayalew, Dereje, Furman, Tanya

“…Abstract Magmatism in the East African Rift System (EARS) contains a spatial and temporal record of changing contributions from the Afar mantle plume,…”
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Re–Os isotope systematics in Samoan shield lavas and the use of Os-isotopes in olivine phenocrysts to determine primary magmatic compositions by Jackson, Matthew G., Shirey, Steven B.

“…Samoan shield-stage lavas (from the islands of Ta'u, Savai'i, and Ofu and the seamounts of Vailulu'u and Malumalu) with Os concentrations > 30 ppt have 187Os/…”
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Lithium isotopes in global mid-ocean ridge basalts by Tomascak, Paul B., Langmuir, Charles H., le Roux, Petrus J., Shirey, Steven B.

“…The lithium isotope compositions of 30 well-characterized samples of glassy lavas from the three major mid-ocean ridge segments of the world, spanning a wide…”
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Slab Transport of Fluids to Deep Focus Earthquake Depths—Thermal Modeling Constraints and Evidence From Diamonds by Shirey, Steven B., Wagner, Lara S., Walter, Michael J., Pearson, D. Graham, van Keken, Peter E.

“…The nature and cause of deep earthquakes remain enduring unknowns in the field of seismology. We present new models of thermal structures of subducted slabs…”
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Tungsten Isotope Composition of Archean Crustal Reservoirs and Implications for Terrestrial μ182W Evolution by Jesse R. Reimink, Andrea Mundl‐Petermeier, Richard W. Carlson, Steven B. Shirey, Richard J. Walker, D. Graham Pearson

“…Abstract The evolution of Earth's major geochemical reservoirs over ~4.5 × 109 years remains a matter of intense study. Geochemical tools in the form of…”
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Fast identification of mineral inclusions in diamond at GSECARS using synchrotron X‐ray microtomography, radiography and diffraction by Wenz, Michelle D., Jacobsen, Steven D., Zhang, Dongzhou, Regier, Margo, Bausch, Hannah J., Dera, Przemyslaw K., Rivers, Mark, Eng, Peter, Shirey, Steven B., Pearson, D. Graham

“…Mineral inclusions in natural diamond are widely studied for the insight that they provide into the geochemistry and dynamics of the Earth's interior. A major…”
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Sublithospheric Diamonds: Plate Tectonics from Earth's Deepest Mantle Samples by Shirey, Steven B, Pearson, D. Graham, Stachel, Thomas, Walter, Michael J

“…Sublithospheric diamonds and the inclusions they may carry crystallize in the asthenosphere, transition zone, or uppermost lower mantle (from 300 to ∼800 km),…”
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Diamond Genesis, Seismic Structure, and Evolution of the Kaapvaal-Zimbabwe Craton by Shirey, Steven B., Harris, Jeffrey W., Richardson, Stephen H., Fouch, Matthew J., James, David E., Cartigny, Pierre, Deines, Peter, Viljoen, Fanus

“…The lithospheric mantle beneath the Kaapvaal-Zimbabwe craton of southern Africa shows variations in seismic P-wave velocity at depths within the diamond…”
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Accurate and precise determination of Li isotopic compositions by multi-collector sector ICP-MS by Tomascak, Paul B, Carlson, Richard W, Shirey, Steven B

“…A new method is presented for the preparation of geological materials (water and rock) and their accurate analysis, by multiple collector magnetic sector…”
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Post-Archean Nb-REE-U enrichment in the Superior craton recorded in metasomatised mantle rocks erupted in the 1.1 Ga Midcontinental Rift event by Legros, Hélène, Czas, Janina, Luo, Yan, Woodland, Sarah, Sarkar, Chiranjeeb, Shirey, Steven B., Schulze, Dan, Pearson, D. Graham

“…Mantle xenoliths in a Mesoproterozoic lamprophyre dyke at Elliot Lake, Ontario, located on the east margin of the Midcontinent Rift (MCR), erupted at ~ 1.1 Ga…”
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Comparative Sm-Nd isotope behavior of accessory minerals: Reconstructing the Sm-Nd isotope evolution of early Archean rocks by Wang, Da, Shirey, Steven B., Carlson, Richard W., Fisher, Christopher M., Kemp, Anthony I.S., Bickford, Marion E.

“…Crustal growth and mantle differentiation through Earth’s history are often traced using two radiogenic isotope systems - 176Lu-176Hf and 147Sm-143Nd. Unlike…”
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Os, Nd, O and S isotope constraints on country rock contamination in the conduit-related Eagle Cu–Ni–(PGE) deposit, Midcontinent Rift System, Upper Michigan by Ding, Xin, Ripley, Edward M., Shirey, Steven B., Li, Chusi

“…The Eagle Cu–Ni–(PGE) deposit is hosted by mafic to ultramafic intrusive rocks associated with the Marquette–Baraga dike swarm in northern Michigan. Sulfide…”
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Comment on “Discovery of davemaoite, CaSiO3-perovskite, as a mineral from the lower mantle” by Walter, Michael J, Kohn, Simon C, D Graham Pearson, Shirey, Steven B, Speich, Laura, Stachel, Thomas, Thomson, Andrew R, Yang, Jing

“…Tschauner et al. (Reports, 11 November 2021, p. 891) present evidence that diamond GRR-1507 formed in the lower mantle. Instead, the data support a much…”
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Osmium Recycling in Subduction Zones by Brandon, Alan D., Creaser, Robert A., Shirey, Steven B., Carlson, Richard W.

“…Peridotite xenoliths from the Cascade arc in the United States and in the Japan arc have neodymium and osmium isotopic compositions that are consistent with…”
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