搜索结果: 1-8 共查到“地球化学 isotopic composition”相关记录8条 . 查询时间(0.078 秒)
Controlling factors in stalagmite oxygen isotopic composition and the paleoprecipitation record for the last 1,100 years in Northeast Japan
ortheast Japan stalagmite d18O growth rate precipitation famine records
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2017/4/10
Stable oxygen isotopic analysis was performed on the UT-A stalagmite with annual microbanding from the Uchimagido
Cave in Iwate Prefecture on the Pacific side of Northeast Japan. High-resolution anal...
Chemical and isotopic composition of fumarolic gases at Iwate volcano, Japan, during and after seismic activity in 1998: implications for the modification of ascending volcanic gases
Volcanoes volcanic earthquakes expectations and volcanic gases seismic activity the concentration of hydrochloric acid
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2015/8/27
In 1998, there were many volcanic earthquakes recorded at Iwate volcano, Japan. Although an eruption was anticipated, it never occurred. Fumarolic gases were sampled at the volcano on six occasions du...
Neodymium isotopic composition and concentration in the Southwest Pacific Ocean
Southwest Pacific Nd isotopic composition Antarctic Intermediate Water (AAIW) Upper and Lower Circumpolar Deep Waters (UCDW and LCDW) GEOTRACES
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2017/4/11
We report two vertical profiles of the concentration and isotopic composition of neodymium (Nd) in seawater samples
collected at 20°S and 30°S along a longitude of 170°W in the Southwest Pacific Ocea...
The molybdenum isotopic composition of the modern ocean
Mo isotopes seawater mass-dependent fractionation reference material for Mo isotopic composition
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2017/4/11
Natural variations in the isotopic composition of molybdenum (Mo) are showing increasing potential as a tool in
geochemistry. Although the ocean is an important reservoir of Mo, data on the isotopic ...
Distribution and isotopic composition of n-alkanes from grass, reed and tree leaves along a latitudinal gradient in China
plant n-alkanes carbon isotopes hydrogen isotopes China
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2017/4/12
Molecular composition and compound-specific carbon and hydrogen stable isotope ratios of n-alkanes are presented
for leaves of grass, reeds and trees from five regions extending between latitudes 22°...
Ten-year observation of sulfur isotopic composition of sulfate in aerosols collected at Tsuruoka, a coastal area on the Sea of Japan in northern Japan
long-term observation aerosol sulfate δ34S
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2017/8/9
Atmospheric aerosol samples were collected from 1993 to 2003 at Tsuruoka, Japan, a coastal area on the Sea of Japan. Concentration of water-soluble chemical components and sulfur isotopic ratios of su...
Measurement of chlorine stable isotopic composition by negative thermal ionization mass spectrometry using total evaporation technique
chlorine stable isotopes total evaporation method negative thermal ionization mass spectrometry small samples
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2017/8/9
A total evaporation negative thermal ionization mass spectrometry (TE-N-TIMS) technique for the isotopic analysis of chlorine was developed. This technique provides fast and reliable way to determine ...
Helium in old porcelain: The historical variation of the He isotopic composition in air
helium isotopes atmosphere porcelain anthropogenic fluxes Industrial Revolution
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2017/8/9
It is still debated whether there is a variation of the atmospheric 3He/4He ratio, due to the anthropogenic release of radiogenic 4He contained in fossil fuels, in modern era. In this study, we measur...