American Geophysical Union (AGU)

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Emplacement and dewatering of the world's largest exposed sand injectite complex
American Geophysical Union (AGU) - Tập 13 Số 8 - 2012
Timothy J. Sherry, C. D. Rowe, James Mori, E. E. Brodsky
Sandstone injectites form by up or down‐section flow of a mobilized sand slurry through fractures in overlying rock. They act as reservoirs and high‐permeability conduits through lower permeability rock in hydrocarbon systems. The Yellow Bank Creek Complex, Santa Cruz County, California is the largest known exposure of a sandstone injectite in the world. The complex contains granular textu...... hiện toàn bộ
Further constraints on the diagenetic influences and salinity effect onGlobigerinoides ruber(white) Mg/Ca thermometry: Implications in the Mediterranean Sea
American Geophysical Union (AGU) - Tập 12 Số 10 - Trang n/a-n/a - 2011
Anna Sabbatini, Franck Bassinot, Soumaya Boussetta, Alessandra Negri, Hélène Rebaubier, Fabien Dewilde, J. Nouet, Nicolas Caillon, Caterina Morigi
Low‐latitude hydrological cycle and rapid climate changes during the last deglaciation
American Geophysical Union (AGU) - Tập 8 Số 5 - 2007
C. Levi, Laurent D Labeyrie, Franck Bassinot, F. Guichard, Elsa Cortijo, Claire Waelbroeck, Nicolas Caillon, J. Duprat, Thibault de Garidel‐Thoron, H. Elderfield
Sea surface temperature and oxygen isotopic records from two well‐dated Indian Ocean cores covering the last deglaciation show the occurrence of two periods of increased salinity along the route of warm surface water transport from the Indian to the Atlantic Ocean, one between 18 and 14.5 ka and the other during the Younger Dryas. Our results imply that during these periods, salt accumulat...... hiện toàn bộ
Determination of intratest variability of trace elements in foraminifera by laser ablation inductively coupled plasma‐mass spectrometry
American Geophysical Union (AGU) - Tập 4 Số 12 - 2003
Ed C Hathorne, Olivier Alard, Rachael H. James, Nick Rogers
We have developed a technique to determine the variability of trace elements (including Li, B, Na, Mg, Mn, Cu, Zn, Sr and Ba) within foraminifera tests using laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS). This technique has a high spatial resolution (width 40–80 μm, depth >0.5 μm), is reproducible (<8% external reproducibility) and has low detection limits (...... hiện toàn bộ
Testing the utility of paleonutrient proxies Cd/Ca and Zn/Ca in benthic foraminifera from thermocline waters
American Geophysical Union (AGU) - Tập 11 Số 1 - 2010
S. P. Bryan, Thomas M. Marchitto
Reconstruction of oceanic nutrient concentrations in the past provides information about nutrient cycling and physical circulation and the role these processes have played in past climate changes. The Cd/Ca and Zn/Ca of benthic foraminifera have been used successfully to reconstruct past deep ocean nutrient concentrations. In this study we test the ability of benthic foraminiferal Cd/Ca an...... hiện toàn bộ
Precise determination of the open ocean 234U/238U composition
American Geophysical Union (AGU) - Tập 11 Số 12 - 2010
Morten B. Andersen, Claudine H. Stirling, C. Sciacca, Alex N. Halliday
Uranium has a long residence time in the open oceans, and therefore, its salinity‐normalized U concentration and 234U/238U activity ratio (expressed herein as δ234U, the ‰ deviation from secular equilibrium) are assumed to be uniform. The marine 234U/238U acti...... hiện toàn bộ
Effect of Intense Weathering and Postdepositional Degradation of Organic Matter on Hg/TOC Proxy in Organic‐rich Sediments and its Implicationsfor Deep‐Time Investigations
American Geophysical Union (AGU) - Tập 21 Số 2 - 2020
Guillaume Charbonnier, Thierry Adatte, Karl B. Föllmi, Guillaume Suan
AbstractMercury (Hg) enrichments in sediments are increasingly used as tracer for distal volcanism in deep‐time investigations. The impact of changes in organic‐matter deposition and preservation on sedimentary Hg sequestration is, however, poorly understood. In this study, we evaluate the potential role of intense weathering and postdepositional organic‐matter deg...... hiện toàn bộ
Compositional, morphological, and hysteresis characterization of magnetic airborne particulate matter in Rome, Italy
American Geophysical Union (AGU) - Tập 10 Số 8 - 2009
Leonardo Sagnotti, Jacopo Taddeucci, Aldo Winkler, Andrea Cavallo
The magnetic properties of tree leaves may be used to delineate the abundance and dispersal of anthropogenic airborne particulate matter (PM) in urban environments. In the city of Rome, Italy, circulating vehicles are the main source of magnetic PM, already characterized as prevalently low‐coercivity, magnetite‐like particles. To further constrain the nature and origin of such magnetic par...... hiện toàn bộ
Global variations in H2O/Ce: 1. Slab surface temperatures beneath volcanic arcs
American Geophysical Union (AGU) - Tập 13 Số 3 - 2012
Lauren Cooper, D. M. Ruscitto, Terry Plank, Paul Wallace, E. M. Syracuse, C. E. Manning
We have calculated slab fluid temperatures for 51 volcanoes in 10 subduction zones using the newly developed H2O/Ce thermometer. The slab fluid compositions were calculated from arc eruptives, using melt inclusion‐based H2O contents, and were corrected for background mantle contributions. The temperatures, adjusted to h, ...... hiện toàn bộ
Global variations in H2O/Ce: 2. Relationships to arc magma geochemistry and volatile fluxes
American Geophysical Union (AGU) - Tập 13 Số 3 - 2012
D. M. Ruscitto, Paul Wallace, Lauren Cooper, Terry Plank
We compiled a data set of 100 primitive arc magma compositions from melt inclusion and whole rock analyses to compare volatile contents, slab tracers, and calculated subduction component compositions between 18 subduction zone segments spanning the global range in slab thermal structure. The average primitive magma H2O content in our data set is 3.3 ± 1.2 wt.% (1 s.d.)...... hiện toàn bộ
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