搜索结果: 1-15 共查到“地质学 isotopes”相关记录16条 . 查询时间(0.062 秒)
Oxygen isotopes as a valuable tool for measuring annual growth in tropical trees that lack distinct annual rings
tropical tree with non-distinct annual rings cellulose oxygen isotopes fractionation model Styrax tonkinensis Ficus semicordata var. semicordata
2017/4/11
Some trees from tropical areas lack visually detectable and consistent annual growth rings. As such, we have measured
the radial variation of cellulose oxygen isotopes in trees that grow in seasonall...
High-precision measurements of water isotopes using laser absorption spectroscopy
oxygen isotopes hydrogen isotopes water laser absorption spectroscopy Off-Axis Integrated Cavity
2017/4/11
Hydrogen and oxygen isotopic analysis using an off-axis integrated-cavity output spectroscopy (OA-ICOS) was carefully
checked for long-term stabilities, dependence on the injected water volume, inter...
Origin of boron in the Damxung Co Salt Lake (central Tibet): Evidence from boron geochemistry and isotopes
boron geochemistry origin quaternary deposits Damxung Co Salt Lake Tibet
2017/4/11
The origin of boron in boron-rich salt lakes in the Tibetan Plateau has long been the subject of debate. The Damzung
Co Salt Lake in central Tibet has high boron concentrations (B = 276–313 mg/L) and...
Growth rate of continental crust in the northeast margin of the North China Craton: Constraints from the U–Pb dating and Lu–Hf isotopes of detrital zircons from the Laoha River
North China Craton detrital zircon U–Pb age Hf isotope Laoha River
2017/4/11
Recently, how to quantitatively estimate the growth rate of continental crust is an enigmatic issue. With the development
of ICP-MS technology, the U–Pb dating and Lu–Hf isotopic compositions of detr...
Sediment erosion revealed by study of Cs isotopes derived from the Fukushima Dai-ichi nuclear power plant accident
Fukushima Dai-ichi nuclear power plant accident Cs isotopes erosion Vietnam mega-delta
2017/4/11
Deltaic sediments of the Mekong River delta sampled from a tidal beach in Vietnam during the wet season (late
October 2011) showed strong 137Cs and 134Cs activities reflecting radionuclides released ...
Distribution of Pu isotopes in marine sediments in the Pacific 30 km off Fukushima after the Fukushima Daiichi nuclear power plant accident
Fukushima plutonium isotopes western North Pacific marine sediments SF-ICP-MS
2017/4/11
The Fukushima Dai-ichi Nuclear Power Plant (DNPP) accident has caused serious contamination of the marine environment
from atmospheric fallout deposition and the direct discharges of highly radioacti...
Natural radioactive isotopes in glacier meltwater studies
radon glacier meltwater natural radioactivity
2017/4/12
Glaciers are decaying due to global warming. Svalbard is a very sensitive area within the European High Arctic and
studies on glacier changes and evolutions are representative for the Arctic. The pre...
Use of hydrogeochemistry and environmental isotopes for groundwater characterisation in Morsott–El Aouinet basin, Northeastern Algeria
triassic aquifer salinity isotopes Morsott–El Aouinet
2017/4/12
Due to its history, development of its hydrologic regime, recharge-discharge mechanisms, geologic formations and
development of its hydrodynamic pattern, the groundwater resources of the Morsott–El A...
Helium isotopes of seawater in the Philippine Sea and the western North Pacific
3He/4He ratios abyssal current Philippine Sea North Pacific seawater
2017/8/9
We measured helium isotopic ratios of 84 seawater samples from various depths collected in the western North Pacific Ocean and the western Philippine Sea. The 3He/4He ratios varied significantly from ...
The succession of Hirnantian events based on data from Baltica:brachiopods,chitinozoans,conodonts,and carbon isotopes
Hirnantian Baltica brachiopods chitinozoans conodonts graptolites carbon isotopes
2009/10/21
The Hirnantian (late Ordovician) environment was complex and dynamic. Understanding the correct order of events and their precise correlation with a time scale are extremely important for the developm...
Preliminary Identification of Ground-water Nitrate Sources Using Nitrogen and Carbon Stable Isotopes,Kansas
Preliminary Identification Ground-water Nitrate Sources Nitrogen and Carbon Stable Isotopes
2009/10/20
Increasing nitrate-N in ground water is a problem in many areas with limited ground-water supplies, such as west-central Kansas. However, potential sources of nitrate-N are not known. Nitrate-N concen...
Relationship between geological structure and helium isotopes in deep groundwater from the Osaka Basin: Application to deep groundwater hydrology
helium isotopes noble gas groundwater hydrology Osaka basin
2017/8/10
The relationship between geological structure and helium isotopes is discussed for deep groundwaters from the Osaka sedimentary basin, southwest Japan, to understand dissolved He in groundwater for hy...
Stable isotopes in deep-sea corals and a new mechanism for “vital effects”
Stable isotopes deep-sea corals new mechanism vital effects
2014/4/9
Offsets from isotopic equilibrium in biogenic carbonates have complicated paleoclimate reconstructions for decades. A new archive of climate, deep-sea corals, is used to evaluate the calcification pro...
DOC cycling in a temperate estuary: A mass balance approach using natural 14C and 13C isotopes
DOC cycling temperate estuary A mass balance approach natural 14C 13C isotopes
2014/6/9
We measured dissolved organic carbon (DOC), dissolved inorganic carbon (DIC), and their corresponding del14C and del13C values in order to study the sources and fates of DOC in the York River Estuary ...
Fractionation of hydrogen isotopes in lipid biosynthesis
lipid biosynthesis hydrogen isotopes
2014/4/8
Isotopic compositions of carbon-bound hydrogen in individual compounds from eight di€erent organisms were
measured using isotope-ratio-monitoring gas chromatography±mass spectrometry. This techn...