A new analytical protocol for high precision U–Th–Pb chemical dating of xenotime from the TTG gneisses of the Bundelkhand Craton, central India, using CAMECA SXFive Electron Probe Micro Analyzer

2020 ◽  
Vol 129 (1) ◽  
Author(s):  
Hiredya Chauhan ◽  
Aparajita Tripathi ◽  
Dinesh Pandit ◽  
N V Chalapathi Rao ◽  
Talat Ahmad
Keyword(s):  
High Precision ◽  
Electron Probe ◽  
Central India ◽  
Electron Probe Micro Analyzer ◽  
Analytical Protocol ◽  
Chemical Dating

Monazite U-Th/Pb chemical dating of the Early Carboniferous syn-kinematic MP/MT metamorphism in the Variscan French Massif Central

2009 ◽  
Vol 180 (3) ◽  
pp. 283-292 ◽  
Author(s):  
Jérémie Melleton ◽  
Michel Faure ◽  
Alain Cocherie
Keyword(s):  
Electron Probe ◽  
Early Carboniferous ◽  
Variscan Belt ◽  
French Massif Central ◽  
Massif Central ◽  
Close Range ◽  
Chemical Dating

AbstractIn situ U-Th-Pb geochronology on monazite using Electron Probe Micro Analyser, constrained by structural and textural observations, has been performed on four samples from the Limousin area (northwest part of the French Massif Central) in order to date the syn-kinematic MP/MT metamorphism related to the top-to-the-NW shearing that deformed the stack of nappes in this zone of the Variscan belt. All the analyzed samples lead to a mean age at 360 ± 4 Ma. The close range of ages obtained during this study (360 Ma) and with the previous 40Ar-39Ar ones (360–350 Ma) suggests fast processes of cooling and exhumation during the Early Carboniferous in internal zones of the Variscan belt. The geodynamic significance of this Early Carboniferous event is discussed at the scale of the Ibero-Armorican orocline.

Preparation of Al2O3/Al-Si Composites by In Situ Reaction of Fe2O3+MnO2/Al System

2015 ◽  
Vol 816 ◽  
pp. 48-53
Author(s):  
Jing Zhang ◽  
Hua Shun Yu ◽  
Xin Ting Shuai ◽  
Hong Mei Chen ◽  
Guang Hui Min
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Electron Probe ◽  
Room Temperature ◽  
Manganese Content ◽  
Hardness Test ◽  
Test Results ◽  
Electron Probe Micro Analyzer ◽  
Transmission Electron ◽  
Polygonal Shape

Al2O3 particles reinforced ZL109 composites were prepared by in-situ reaction between Fe2O3+MnO2 and Al in this paper. The influence of ratio of Mn to Fe on the morphologies of Al-Si-Mn-Fe phase and mechanical properties of the composites was investigated. The microstructure was studied by electron probe micro-analyzer (EPMA) and transmission electron microscopy (TEM). The results show that the Al2O3 particles displaced by the Fe2O3+MnO2/Al system are in nanosize. The acicular Al-Si-Fe phases change from acicular to polygonal shape and become smaller with the increase manganese content. The hardness test results have no big difference on the composites. However, the ultimate tensile strength at room temperature and 350°C enhance evidently with the increasing of Mn/Fe.

scholarly journals Studies on Structure and Coloring of Aluminum Anodic Oxide Films by Electron Probe Micro-Analyzer

1972 ◽  
Vol 23 (1) ◽  
pp. 18-24 ◽  
Author(s):  
Toshiro TAKAHASHI ◽  
Toshihiro NAGANO ◽  
Kenji WADA ◽  
Masashi IKEGAYA ◽  
Hideo TAGAI
Keyword(s):  
Electron Probe ◽  
Oxide Films ◽  
Anodic Oxide ◽  
Anodic Oxide Films ◽  
Electron Probe Micro Analyzer

scholarly journals Geochemical and Mineralogical Characteristics of Garnierite From the Morowali Ni-Laterite Deposit in Sulawesi, Indonesia

2021 ◽  
Vol 9 ◽  
Author(s):  
Yuri Choi ◽  
Insung Lee ◽  
Inkyeong Moon
Keyword(s):  
Cation Exchange ◽  
Electron Probe ◽  
Mineralization Process ◽  
Ore Deposit ◽  
Electron Probe Micro Analyzer ◽  
Mineralogical Characteristics ◽  
Fe Content ◽  
Geochemical Study ◽  
Different Types ◽  
Bottom To Top

The Morowali Ni-laterite deposit is located in the East Sulawesi Ophiolite, which is a large ophiolite belt on Sulawesi Island, Indonesia. The Morowali deposit is developed on a laterite profile due to ophiolite weathering, with saprolite, limonite, and ferruginous cap horizons from the bottom to top. Based on the occurrence of garnierite as the main ore, occurring in the saprolite horizon, it can be classified that the ore deposit is hydrous Mg silicate-type. The Ni ore is classified into different types based on color and XRD and electron probe micro-analyzer analyses. Whole-rock geochemical study was also conducted to understand the mineralization process. The Morowali Ni deposit consists of serpentine-like and talc-like phases. The serpentine-like phase consists of Ni-lizardite and karpinskite (0.76–38.26 wt% NiO) while the talc-like phase is mainly composed of kerolite (4.02–8.02 wt% NiO). The serpentine-like garnierite exhibits high Ni and Fe contents and occurrence similar to that of the serpentine observed in the saprolite horizon, suggesting the serpentine-like garnierite originated from the bedrock, and Mg-Ni cation exchange occurred during laterization. Contrastingly, the lower Fe content of the talc-like phase (0.01–0.05 wt%) than the serpentine-like phase (0.14–7.03 wt%) indicates that the talc-like garnierite is of secondary origin since Fe is immobile during weathering. The Morowali Ni-laterite deposit was mainly formed during laterization. The repetition of dry and wet cycles in each year results in the formation of secondary garnierite.

Synthesis the Precursor of LiNi0.5Mn0.5O2 via an Improved Carbonate Co-Precipitation

2011 ◽  
Vol 233-235 ◽  
pp. 32-35
Author(s):  
Yi Jie Gu ◽  
Yong Hu ◽  
Hong Quan Liu ◽  
Heng Hui Zhou ◽  
Zhen Guo ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Physical Characteristic ◽  
Electron Probe ◽  
Precipitation Method ◽  
Narrow Particle Size Distribution ◽  
Electron Probe Micro Analyzer ◽  
Secondary Particles ◽  
Co Precipitation ◽  
Line Analysis

Spherical Ni0.5Mn0.5CO3 is synthesized via carbonate co-precipitation method which uses NH4HCO3 as the precipitator. However, obvious agglomerate of secondary particles occurs when NH4HCO3 is used as the precipitator. The agglomerate particles can result in inferior physical characteristic. An improved carbonate co-precipitation which used NH4HCO3 doped with different proportion of NaOH as a new precipitator is tested in our study. Observed by SEM and Mastersizer, spherical morphology with narrow particle size distribution is synthesized with the proportion of NaOH reaches 10%. The element line analysis by Electron Probe Micro-analyzer shows symmetrical distributions of Ni and Mn elements via the improved carbonate co-precipitation.

Use of the Soft X-Ray Spectrograph and the Electron-Probe Microanalyzer for Determination of Elements Carbon Through Iron in Minerals and Rocks

1965 ◽  
Vol 9 ◽  
pp. 487-503
Author(s):  
A. K. Baird ◽  
D. H. Zenger
Keyword(s):  
High Precision ◽  
Electron Probe ◽  
Bulk Composition ◽  
Major Elements ◽  
Major Constituent ◽  
X Ray ◽  
Electron Probe Microanalyzer ◽  
Minor Elements ◽  
Combined Use ◽  
Sodium Magnesium

AbstractThe major elements m common rocks are of low atomic number, but analyses of high precision are possible by soft X-ray spectrography if several grams of rock sample are available. The electron-probe microanalyzer is shown to complement this established method by permitting analyses of particles as small as 1 μ in diameter. This paper describes applications of these methods to the analysis of the major and minor elements of silicate, carbonate, and phosphate minerals and rocks.Elements of particular interest are as follows : carbon in particles enclosed in carbonate rocks; oxygen, as the major constituent of the specimens; phosphorus in phosphatic nodules and apatites; manganese and iron, as colorations in fossil shells; and the group oxygen, sodium, magnesium, aluminum, silicon, potassium, calcium, and iron as complex segregations and zonations within single crystals of several mineral phases.If the bulk composition of a rock is known, and also the chemistry of the constituent minerals, it is possible to compute quantitative minéralogie analyses of high precision. Thus, the combined use of soft X-ray spectrography and electronprobe microanalysis can provide quantitative chemical and mineralogicat information on the earth's crust on all scales from thousands of square miles (by means of appropriate sampling) down to the scale of 1 μ.

scholarly journals 50 Years of JEOL Electron Probe Micro Analyzer

2011 ◽  
Vol 17 (S2) ◽  
pp. 586-587
Author(s):  
H Takahashi
Keyword(s):  
Electron Probe ◽  
Electron Probe Micro Analyzer

Extended abstract of a paper presented at Microscopy and Microanalysis 2011 in Nashville, Tennessee, USA, August 7–August 11, 2011.

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