American Geophysical Union (AGU)

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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
Natural surface rebound of the Bangkok plain and aquifer characterization by persistent scatterer interferometry
American Geophysical Union (AGU) - Tập 15 Số 4 - Trang 965-974 - 2014
Kazuya Ishitsuka, Y. Fukushima, Takeshi Tsuji, Yasuhiro Yamada, Toshifumi Matsuoka, Pham Huy Giao
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
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
Characterization of Mg/Ca distributions in planktonic foraminifera species by electron microprobe mapping
American Geophysical Union (AGU) - Tập 6 Số 12 - 2005
Aleksey Sadekov, Stephen M. Eggins, Patrick De Deckker
The distribution of Mg/Ca within the tests of eight modern planktonic foraminifer species has been characterized using electron microprobe mapping. Species include several that are commonly used for estimation of past seawater temperatures (Globigerinoides ruber, G. sacculifer, Neogloboquadrina incompta (synon...... hiện toàn bộ
The geodynamic equation of state: What and how
American Geophysical Union (AGU) - Tập 10 Số 10 - 2009
J. A. D. Connolly
Geodynamic models commonly assume equations of state as a function of pressure and temperature. This form is legitimate for homogenous materials, but it is impossible to formulate a general equation of state for a polyphase aggregate, e.g., a rock, as a function of pressure and temperature because these variables cannot distinguish all possible states of the aggregate. In consequence, the ...... hiện toàn bộ
Age of the Batoka basalts, northern Zimbabwe, and the duration of Karoo Large Igneous Province magmatism
American Geophysical Union (AGU) - Tập 2 Số 2 - 2001
D. L. Jones, Robert A. Duncan, J. C. Briden, Darren E. Randall, Conall Mac Niocaill
Analysis of the Batoka Basalts exposed in the Zambezi Gorge some 40 km east of Victoria Falls characterizes them as high Fe, moderately high Ti, and low K, P, and Zr tholeiites. The 40Ar‐39Ar age determinations are tightly clustered at 180–179 Ma. All of the lavas that were sampled have normal paleomagnetic polarity, and the corresponding pole posi...... hiện toàn bộ
A study of cleaning procedures used for foraminiferal Mg/Ca paleothermometry
American Geophysical Union (AGU) - Tập 4 Số 9 - 2003
S. Barker, Mervyn Greaves, H. Elderfield
The various cleaning steps required for preparation of foraminiferal samples for Mg/Ca (and Sr/Ca) analysis are evaluated for their relative importance and effects on measured elemental ratios. It is shown that the removal of silicate contamination is the most important step for the measurement of Mg/Ca ratios. In an example, bulk sample Mg/Ca decreases from 10.5 to 2.5 mmol mol−...... hiện toàn bộ
Large‐scale rigid‐body rotation in the mantle wedge and its implications for seismic tomography
American Geophysical Union (AGU) - Tập 7 Số 5 - 2006
Weronika Gorczyk, Taras Gerya, J. A. D. Connolly, David A. Yuen, M. L. Rudolph
Using a combined finite difference and marker‐in‐cell technique, we performed two‐dimensional coupled petrological‐thermomechanical numerical simulations of intraoceanic subduction. The simulations indicate that parts of the mantle wedge can become trapped between rheologically weak, hydrated, and partially molten upwellings (cold plumes) and the subducting slab. The structures form at var...... hiện toàn bộ
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