搜索结果: 1-15 共查到“地质学 samples”相关记录29条 . 查询时间(0.082 秒)
Fossil pollen samples suggest vulnerability to extinctions ahead（图）
Fossil pollen samples suggest vulnerability extinctions ahead
2020/9/4
Reduced resilience of plant biomes in North America could be setting the stage for the kind of mass extinctions not seen since the retreat of glaciers and arrival of humans about 13,000 years ago, cau...
Rock Samples Indicate Water is Key Ingredient for Crust Formation
Rock Samples Indicate Water Crust Formation
2017/7/19
By examining the cooling rate of rocks that formed more than 10 miles beneath the Earth’s surface, scientists led by The University of Texas at Austin Jackson School of Geosciences have found that wat...
Evidence for the solar wind in lunar magmas: A study of slowly cooled samples of the Apollo 12 olivine basalt suite
hydrogen isotopes melt inclusions mare basalts SIMS lunar olivine
2017/4/10
While it is now recognized that the Moon has indigenous water and volatiles, their total abundances are unclear, with
current literature estimates ranging from nearly absent to Earth-like levels. Sim...
Simultaneous determinations of fluorine, chlorine, and sulfur in rock samples by ion chromatography combined with pyrohydrolysis
pyrohydrolysis halogen sulfur ion chromatography geological reference material
2017/4/10
We present a simplified method for simultaneous determinations of fluorine (F), chlorine (Cl), and sulfur (S) contents
and isotopic abundances in rock samples. After using pyrohydrolysis to extract F...
Microanalysis of Pb isotope ratios of low-Pb glass samples by femtosecond laser ablation-multiple ion counter-ICP-mass spectrometry (fsLA-MIC-ICP-MS)
Pb isotopes laser ablation ICP-MS multiple ion counting (MIC) silicate glass geological reference materials
2017/4/11
We report high-resolution in situ Pb isotope analysis (207Pb/206Pb and 208Pb/206Pb ratios) by femtosecond laser
ablation-multiple ion counter-inductively coupled plasma-mass spectrometry (fsLA-MIC-IC...
Evaluation of a rapid, effective sample digestion method for trace element analysis of granitoid samples containing acid-resistant minerals: Alkali fusion after acid digestion
silicate digestion method trace element abundance silicate reference material alkali fusion
2017/4/10
Alkali fusion after acid digestion method (AFAD) was used for determination by ICP-MS of twenty-five trace elements
(Rb, Sr, Y, Zr, Nb, Cs, Ba, Hf, Pb, Th, U, and rare earth elements) in four silicat...
Simple relationship between 26Al production rate and major elemental composition of meteorite samples
production rate 26Al terrestrial age howardite eucrite
2017/4/11
Estimation of 26Al (half-life = 705 kyr) content at the time of meteorite fall is required to calculate the terrestrial age
of meteorites using the 26Al content. Previous studies (e.g., Cressy, 1971;...
Investigation of cesium adsorption on soil and sediment samples from Fukushima Prefecture by sequential extraction and EXAFS technique
cesium adsorption clay minerals sequential extraction extended X-ray absorption fine structure (EXAFS) Fukushima
2017/4/11
Previous studies have shown that radiocesium (mainly 137Cs) was retained at the very surface of soils in Fukushima
Prefecture. Clay minerals and micas are assumed as the main sorbents for cesium (Cs)...
Flow Injection Spectrophotometric Determination of Hydrazine in Environmental Water Samples
Flow Injection Hydrazine Spectrophotometry
2011/12/14
A simple, accurate, sensitive and selective flow injection spectrophotometric method for rapid determination of amounts of hydrazine was proposed in this paper, which was based on p-dimethylamino-benz...
MINERALOGICAL ABUNDANCES AS DETERMINED BY X-RAY DIFFRACTION IN SELECT SAMPLES OF THE UPPER FLORIDA AQUIFER
MINERALOGICAL ABUNDANCES X-RAY DIFFRACTION FLORIDA AQUIFER
2011/11/11
Analysis of 53 bulk powders derived from various rocks of the Upper Floridan Aquifer reveal calcite, dolomite/ankerite, quartz, apatite, and smectite to be the dominant minerals, with the clay and apa...
MINERALOGICAL COMPOSITION OF SOIL SAMPLES IN THE NELLIS DUNES RECREATION AREA
MINERALOGICAL COMPOSITION SOIL SAMPLES NELLIS DUNES RECREATION AREA
2011/11/7
Natural dust is primarily composed of mineral grains. A mineral is a substance having a crystalline internal structure and characteristic chemical composition or a definite range of composition that h...
In-Situ Identification of Palygorskite in Maya Blue Samples Using X-Ray Powder Diffraction
Palygorskite X-Ray Powder Diffraction Maya Blue Samples
2011/11/4
In spite of the abundance of colors found in the murals and other objects that correspond to the Classic Mayan period (600-900 A.D.), a peculiar hue captured the interest of researchers. The most well...
The development of whole rock analysis of major and trace elements in XRF glass beads by fsLA-ICPMS in GSJ geochemical reference samples
bulk chemistry major and trace elements glass beads
2017/4/12
Using laser-ablation inductively coupled plasma mass spectrometer (LA-ICPMS), we have improved the reliability of
the abundance data for trace-elements in geochemical samples using a glass bead ablat...
Error analysis of the determination of carbon stable isotope ratios in lignin and cellulose from plant samples
plants carbon isotope ratio lignin
2017/4/12
To determine the accuracy and precision limits associated with carbon stable isotope ratio (δ13C) measurements of
cellulose and lignin from plant samples, experiments were performed using differing e...
A simple method for the precise determination of boron, zirconium, niobium, hafnium and tantalum using ICP-MS and new results for rock reference samples
ICP-MS analytical method rock reference samples boron high field strength elements
2017/8/9
An analytical technique for determining boron, zirconium, niobium, hafnium and tantalum contents in rock samples by inductively coupled plasma mass spectrometry (ICP-MS) is described. The rock samples...