Search Results - "HEIN, JAMES R."

Fractionation of the geochemical twins Zr–Hf and Nb–Ta during scavenging from seawater by hydrogenetic ferromanganese crusts by Schmidt, Katja, Bau, Michael, Hein, James R., Koschinsky, Andrea

“…In contrast to igneous systems, the geochemical twins Zr and Hf are decoupled from each other in seawater, and specific Zr/Hf ratios appear to be…”
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Geographic and Oceanographic Influences on Ferromanganese Crust Composition Along a Pacific Ocean Meridional Transect, 14 N to 14S by Kira Mizell, James R. Hein, Phoebe J. Lam, Anthony A. P. Koppers, Hubert Staudigel

“…Abstract The major controls on the variability of ferromanganese (FeMn) crust composition have been generally described over the past 40 years; however, most…”
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Controls on ferromanganese crust composition and reconnaissance resource potential, Ninetyeast Ridge, Indian Ocean by Hein, James R., Conrad, Tracey, Mizell, Kira, Banakar, Virupaxa K., Frey, Frederick A., Sager, William W.

“…A reconnaissance survey of Fe–Mn crusts from the 5000km long (~31°S to 10°N) Ninetyeast Ridge (NER) in the Indian Ocean shows their widespread occurrence along…”
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Genesis and Evolution of Ferromanganese Crusts from the Summit of Rio Grande Rise, Southwest Atlantic Ocean by Mariana Benites, James R. Hein, Kira Mizell, Terrence Blackburn, Luigi Jovane

“…The Rio Grande Rise (RGR) is a large elevation in the Atlantic Ocean and known to host potential mineral resources of ferromanganese crusts (Fe–Mn), but no…”
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Spectroscopic Insights Into Ferromanganese Crust Formation and Diagenesis by Kevin M. Sutherland, Scott D. Wankel, James R. Hein, Colleen M. Hansel

“…Abstract Marine ferromanganese deposits, often called the scavengers of the sea, adsorb and coprecipitate with a wide range of metals of great interest for…”
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Persistence of deeply sourced iron in the Pacific Ocean by Horner, Tristan J., Williams, Helen M., Hein, James R., Saito, Mak A., Burton, Kevin W., Halliday, Alex N., Nielsen, Sune G.

“…Biological carbon fixation is limited by the supply of Fe in vast regions of the global ocean. Dissolved Fe in seawater is primarily sourced from continental…”
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The molecular mechanism of Mo isotope fractionation during adsorption to birnessite by Wasylenki, Laura E., Weeks, Colin L., Bargar, John R., Spiro, Thomas G., Hein, James R., Anbar, Ariel D.

“…Fractionation of Mo isotopes during adsorption to manganese oxides is a primary control on the global ocean Mo isotope budget. Previous attempts to explain…”
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Mineral and chemostratigraphy of a Toarcian black shale hosting Mn-carbonate microbialites (Úrkút, Hungary) by Polgári, Márta, Hein, James R., Bíró, Lóránt, Gyollai, Ildikó, Németh, Tibor, Sajgó, Csanád, Fekete, József, Schwark, Lorenz, Pál-Molnár, Elemér, Hámor-Vidó, Mária, Vigh, Tamás

“…Toarcian black shale that hosts Mn-carbonate microbialites at Úrkút, Hungary was investigated by mineralogical, inorganic, and organic geochemical methods for…”
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Sand sources and transport pathways for the San Francisco Bay coastal system, based on X-ray diffraction mineralogy by Hein, James R., Mizell, Kira, Barnard, Patrick L.

“…The mineralogical compositions of 119 samples collected from throughout the San Francisco Bay coastal system, including bayfloor and seafloor, area beaches,…”
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Humidification of Central Asia and equatorward shifts of westerly winds since the late Pliocene by Zhong, Yi, Shi, Xuefa, Yang, Hu, Wilson, David J., Hein, James R., Kaboth-Bahr, Stefanie, Lu, Zhengyao, Clift, Peter D., Yan, Qing, Lohmann, Gerrit, Liu, Jiabo, González, Francisco Javier, Jiang, Xiaodong, Jiang, Zhaoxia, Liu, Qingsong

“…The production, transport, and deposition of mineral dust exert major influences on climate change and Earth’s biogeochemical cycles. Furthermore, their…”
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A Sr–Nd isotopic study of sand-sized sediment provenance and transport for the San Francisco Bay coastal system by Rosenbauer, Robert J., Foxgrover, Amy C., Hein, James R., Swarzenski, Peter W.

“…A diverse suite of geochemical tracers, including 87Sr/86Sr and 143Nd/144Nd isotope ratios, the rare earth elements (REEs), and select trace elements were used…”
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Deep-ocean polymetallic nodules as a resource for critical materials by Hein, James R., Koschinsky, Andrea, Kuhn, Thomas

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Mineral Phase-Element Associations Based on Sequential Leaching of Ferromanganese Crusts, Amerasia Basin Arctic Ocean by Natalia Konstantinova, James R. Hein, Amy Gartman, Kira Mizell, Pedro Barrulas, Georgy Cherkashov, Pavel Mikhailik, Alexander Khanchuk

“…Ferromanganese (FeMn) crusts from Mendeleev Ridge, Chukchi Borderland, and Alpha Ridge, in the Amerasia Basin, Arctic Ocean, are similar based on morphology…”
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Deep-sea Fe-Mn Crusts from the Northeast Atlantic Ocean: Composition and Resource Considerations by Muiños, Susana Bolhão, Hein, James R., Frank, Martin, Monteiro, José Hipólito, Gaspar, Luís, Conrad, Tracey, Pereira, Henrique Garcia, Abrantes, Fátima

“…Eighteen deep-sea ferromanganese crusts (Fe-Mn crusts) from 10 seamounts in the northeast Atlantic were studied. Samples were recovered from water depths of…”
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New age for ferromanganese crust 109D-C and implications for isotopic records of lead, neodymium, hafnium, and thallium in the Pliocene Indian Ocean by Nielsen, Sune G., Gannoun, Abdelmouhcine, Marnham, Charles, Burton, Kevin W., Halliday, Alex N., Hein, James R.

“…This study presents a high‐resolution record of osmium and thallium isotopes in a ferro‐manganese (Fe‐Mn) crust from the Indian Ocean, Antipode 109D‐C. These…”
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Seamount Characteristics and Mine-Site Model Applied to Exploration- and Mining-Lease-Block Selection for Cobalt-Rich Ferromanganese Crusts by Hein, James R., Conrad, Tracey A., Dunham, Rachel E.

“…Regulations are being developed through the International Seabed Authority (ISBA) for the exploration and mining of cobalt-rich ferromanganese crusts. This…”
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Platinum enrichment and phase associations in marine ferromanganese crusts and nodules based on a multi-method approach by Koschinsky, Andrea, Hein, James R., Kraemer, Dennis, Foster, Andrea L., Kuhn, Thomas, Halbach, Peter

“…Marine ferromanganese crusts and nodules host high concentrations of many economically interesting metals such as platinum (Pt), with Pt concentrations in the…”
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Uptake of elements from seawater by ferromanganese crusts: solid-phase associations and seawater speciation by Koschinsky, Andrea, Hein, James R.

“…Marine Fe–Mn oxyhydroxide crusts form by precipitation of dissolved components from seawater. Three hydrogenetic crust samples (one phosphatized) and two…”
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Miocene Phosphatization of Rocks From the Summit of Rio Grande Rise, Southwest Atlantic Ocean by Benites, Mariana, Hein, James R., Mizell, Kira, Jovane, Luigi

“…Marine phosphorites are an important part of the oceanic phosphorus cycle and are related to the effects of long‐term global climate changes. We use…”
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The evolution of climatically driven weathering inputs into the western Arctic Ocean since the late Miocene: Radiogenic isotope evidence by Dausmann, Veit, Frank, Martin, Siebert, Christopher, Christl, Marcus, Hein, James R

“…We present the first continuous records of dissolved radiogenic neodymium, hafnium, and lead isotope compositions of deep waters in the western Arctic Ocean,…”
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