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作者:François Chabaux , Christophe Hémond , Claude J. Allègre
来源:[J].Chemical Geology(IF 3.154), 1999, Vol.153 (1), pp.171-185
摘要:Abstract(#br)238 U– 230 Th– 226 Ra disequilibria have been determined on historical lava flows from several active volcanoes of the Lesser Antilles Arc. The data reveal significant correlations between 238 U– 230 Th and 230 Th– 226 Ra disequilibria suggesting that the...
作者:Simon Turner , Thomas Kokfelt , Folkmar Hauff ...
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 2015, Vol.169, pp.152-166
摘要:Abstract(#br)U-series disequilibria have provided important constraints on the physical processes of partial melting that produce basaltic magma beneath mid-ocean ridges. Here we present the first 238 U– 230 Th– 226 Ra isotope data for a suite of 83 basalts sampled between...
作者:Mathieu Touboul , Bernard Bourdon , Benoît Villemant ...
来源:[J].Chemical Geology(IF 3.154), 2007, Vol.246 (3), pp.181-206
摘要:Abstract(#br)Andesitic products of the last magmatic eruption at La Soufrière in Guadeloupe (1530 AD) were analyzed for 238 U– 230 Th– 226 Ra in order to constrain the timescales of magmatic processes preceding the eruption. Magma composition evolved during eruption from...
作者:Christelle Claude-Ivanaj , Jean-Louis Joron , Claude J Allègre
来源:[J].Chemical Geology(IF 3.154), 2001, Vol.176 (1), pp.295-310
摘要:Abstract(#br)This study reports 238 U– 230 Th– 226 Ra nuclides measured by mass spectrometry, trace elements and 87 Sr/ 86 Sr isotopes on historical alkali basalts from the Azores region. The ( 230 Th/ 232 Th) activity in the alkali basalts spans a range (from 0.897 in Sao...
作者:Tetsuya Yokoyama , Festus T. Aka , Minoru Kusakabe ...
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 2007, Vol.71 (7), pp.1835-1854
摘要:Abstract(#br)Precise measurements of 238 U– 230 Th– 226 Ra disequilibria in lavas erupted within the last 100 yr on Mt. Cameroon are presented, together with major and trace elements, and Sr–Nd–Pb isotope ratios, to unravel the source and processes of basaltic magmat...
作者:Takele A. Chekol , Katsura Kobayashi , Tetsuya Yokoyama ...
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 2010, Vol.75 (1), pp.256-283
摘要:Abstract(#br)Measurements of 238 U– 230 Th– 226 Ra disequilibria, Sr–Nd–Pb–Hf isotopes and major-trace elements have been conducted for lavas erupted in the last quarter-millennium at Hekla volcano, Iceland. The volcanic rocks range from basalt to dacite. Most of the l...
作者:Gary R. Eppich , Kari M. Cooper , Adam J.R. Kent ...
来源:[J].Earth and Planetary Science Letters(IF 4.349), 2012, Vol.317-318, pp.319-330
摘要:... We report here 230 Th– 226 Ra model ages of two distinct populations of plagioclase from low silica dacites from Mount Hood, Oregon, a volcano where previous studies show that the compositions of erupted magmas are controlled by magma recharge, mixing, and incorporatio...
作者:David W. Peate , Chris J. Hawkesworth , Peter W. van Calsteren ...
来源:[J].Earth and Planetary Science Letters(IF 4.349), 2001, Vol.187 (3), pp.259-272
摘要:Abstract(#br)238 U– 230 Th– 226 Ra disequilibria data are presented for dredged glasses from the slow-spreading, plume-influenced Reykjanes Ridge, and lavas from the Reykjanes Peninsula, Iceland. Southern Reykjanes Ridge samples (57.7°–58.8°N), identified as ‘zero-age...
作者:Tetsuya Yokoyama , Takeshi Kuritani , Katsura Kobayashi ...
来源:[J].Geochimica et Cosmochimica Acta(IF 3.884), 2006, Vol.70 (11), pp.2885-2901
摘要:Abstract(#br)In order to unravel magma processes and the geochemical evolution of shallow plumbing systems beneath active volcanoes, we investigated U-series disequilibria of rocks erupted over the past 500 years (1469–2000 AD) from Miyakejima volcano, Izu arc, Japan. Miyakej...
作者:Chris J. Russo , Ken H. Rubin , David W. Graham
来源:[J].Earth and Planetary Science Letters(IF 4.349), 2008, Vol.278 (1), pp.55-66
摘要:Abstract(#br)Intermediate-spreading Southeast Indian Ridge (SEIR) basalts display geographic gradients from 90°E to 118°E in Th/U, ( 230 Th/ 232 Th) and 238 U– 230 Th– 226 Ra disequilibria ( 230 Th-excesses of 1 to 21% and 226 Ra-excesses of 0 to 160%). Highly correlated ( ...

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