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作者:Gonca Gençalioğlu-Kuşcu , Göksu Uslular , Martin Danišík ...
来源:[J].Quaternary Geochronology(IF 4.015), 2020, Vol.55Elsevier
摘要:... In order to provide new insight into Nisyros tephrochronology, we here present the first (U–Th)/He and 40 Ar/ 39 Ar ages of Kyra distal andesitic pumice previously reported on Datça peninsula.(#br)(U–Th)/He dating of apatite (DZS pumice, Sındıköy) yielded weighted me...
作者:M.C. Pierret , F. Chabaux , S.A.G. Leroy ...
来源:[J].Quaternary Science Reviews(IF 4.076), 2012, Vol.51, pp.40-55Elsevier
摘要:Abstract(#br)This study presents combined mineralogical, chemical, isotopic ( 87 Sr/ 86 Sr and U–Th disequilibria series) and palynological analyses on bulk sediments and on distinct mineral phases (carbonates and clays) from a 10-m-long core drilled in the southern Caspian...
作者:Haibo Zou , Mary R Reid , Yongshun Liu ...
来源:[J].Chemical Geology(IF 3.154), 2003, Vol.200 (1), pp.189-201Elsevier
摘要:... These historic potassic basalts are characterized by significant 230 Th excesses [( 230 Th/ 238 U)=1.24–1.33], and low 143 Nd/ 144 Nd ( ε Nd =−5.0 to −3.7) and 206 Pb/ 204 Pb (16.8–17.1). Strong 230 Th excesses, low CaO+Al 2 O 3 , and large bulk partition coefficien...
作者:Daniel Marshall , Bassam Ghaleb , Robert Countess ...
来源:[J].Quaternary Science Reviews(IF 4.076), 2009, Vol.28 (23-24), pp.2507-2513Elsevier
摘要:Abstract(#br)A combination of δ 13 C and δ 18 O analyses with U–Th disequilibrium dating on a stalagmite and groundwater from the deep and extensive Arch Cave network on northeastern Vancouver Island has produced a preliminary 12,200 y paleoclimatic profile. Speleothem d...
作者:Haibo Zou , Qicheng Fan , Yupeng Yao
来源:[J].Chemical Geology(IF 3.154), 2008, Vol.255 (1), pp.134-142Elsevier
摘要:... Jingbohu lavas display variable extents of 230 Th excesses (10 to 28%) and moderately depleted Nd isotopic compositions ( ε Nd = + 1.5 to + 3.3). Long-gang lavas have pronounced (33 to 35%) 230 Th excesses and slightly depleted Nd isotopic compositions ( ε Nd = + 0.5 to ...
作者:Stephen Grimes , David Rickard , Chris Hawkesworth ...
来源:[J].Journal of Volcanology and Geothermal Research(IF 2.193), 1998, Vol.81 (3), pp.327-333Elsevier
摘要:Abstract(#br)We report here the first U–Th disequilibrium age for a hydrothermal mineral from an active geothermal system in New Zealand. Vein calcite recovered from a depth of 389 m in Well Thm-1 at the Tauhara geothermal field has an age of 99±44 ka BP. This age was det...
作者:Haibo Zou , Qicheng Fan
来源:[J].LITHOS(IF 3.779), 2010, Vol.116 (1), pp.145-152Elsevier
摘要:... U–Th disequilibrium data as well as Nd, Sr, Pb isotopes and major and trace element concentrations were measured on the youngest lavas from Maanling volcano and Leihuling volcano of the Hainan Island. All the Holocene Hainan basalts display light rare earth element (LR...
作者:Yumiko Watanabe , Shun’ichi Nakai
来源:[J].Microchimica Acta(IF 3.434), 2007, Vol.156 (3-4), pp.289-295Springer
摘要:...(#br)This study aims at developing a new analytical procedure for U–Th radioactive disequilibrium of carbonate rock samples. The procedure utilizes commercially available U and Th reagents as spikes for isotope dilution analysis with a multiple-collector inductively coupled...
作者:S. Harangi , R. Lukács , A.K. Schmitt ...
来源:[J].Journal of Volcanology and Geothermal Research(IF 2.193), 2015, Vol.301, pp.66-80Elsevier
摘要:... Combined U–Th and (U–Th)/He zircon dating demonstrates that intermittent volcanic eruptions occurred in a time range of 56–32 ka. The reliability of the eruption dates is supported by concordant ages obtained from different dating techniques, such as zircon geochronol...
作者:N. Durand , B. Hamelin , P. Deschamps ...
来源:[J].Chemical Geology(IF 3.154), 2016, Vol.446, pp.54-69Elsevier
摘要:... Moreover, these authigenic calcium carbonate precipitates provide us with an interesting test of the U–Th radioactive disequilibrium dating method, the reliability of which has been demonstrated extensively in aragonitic corals and calcitic continental speleothems, but wh...

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