Geochronology of polygenetic monazites constrained by in situ electron microprobe Th-U-total lead determination: implications for lead behaviour in monazite

1998 ◽  
Vol 62 (14) ◽  
pp. 2475-2497 ◽  
Author(s):  
A. Cocherie ◽  
O. Legendre ◽  
J.J. Peucat ◽  
A.N. Kouamelan
Keyword(s):  
Electron Microprobe ◽  
Lead Determination

scholarly journals Re Sulfides from Zhelos and Tokty-Oi Intrusions (East Sayan, Russia)

Minerals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 479 ◽  
Author(s):  
Tatiana Kolotilina ◽  
Aleksey Mekhonoshin ◽  
Dmitriy Orsoev
Keyword(s):  
General Formula ◽  
Electron Microprobe ◽  
Platinum Group Elements ◽  
Metal Ratio ◽  
Rich Liquid ◽  
Mineral Compositions ◽  
Break Up ◽  
Platinum Group

Re sulfides were discovered in Cu–Ni–platinum-group elements (PGE) ores of the Zhelos and Tokty-Oi intrusions. These intrusions can be considered as products of the mantle superplume responsible for Rodinia’s break-up. The mineral compositions were determined in situ in polished samples. Electron microprobe analyses were mostly consistent with a general formula of (Cu,Fe,Mo,Os,Re)5S8, (Cu,Fe,Mo,Os,Re)4S7, and (Cu,Fe,Mo,Re)S2. One of the major features of Re sulfide from the Zhelos intrusion is its high osmium content. The ΣMe/S ratio for a part of our data is consistent with that of the tarkianite. Re sulfides from the Tokty-Oi have a ΣMe/S ratio similar to those in rheniite or dzeskazganite, but differ from them by the presence of Fe and Cu and the metal-to-metal ratio. The localization of the Re sulfide within the chalcopyrite suggests its crystallization from the residual Cu-rich liquid.

scholarly journals Neoproterozoic pegmatite from Skoddefjellet, Wedel Jarlsberg Land, Spitsbergen: Additional evidence for c. 640 Ma tectonothermal event in the Caledonides of Svalbard

2012 ◽  
Vol 33 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Jarosław Majka ◽  
Alexander Larionov ◽  
David Gee ◽  
Jerzy Czerny ◽  
Jaroslav Pršek
Keyword(s):  
Electron Microprobe ◽  
Regional Metamorphism ◽  
Amphibolite Facies ◽  
The Other ◽  
Clear Distinction ◽  
Metasedimentary Rocks ◽  
Facies Metamorphism ◽  
Shrimp Zircon ◽  
Tectonothermal Event

Neoproterozoic pegmatite from Skoddefjellet, Wedel Jarlsberg Land, Spitsbergen: Additional evidence forc. 640 Ma tectonothermal event in the Caledonides of SvalbardNeoproterozoic (c. 640 Ma) amphibolite facies metamorphism and deformation have been shown recently to have affected the Isbjørnhamna and Eimfjellet Complex of Wedel Jarlsberg Land in southwestern Spitsbergen. New SHRIMP zircon U-Pb andin situelectron microprobe monazite and uraninite U-Th-total Pb ages are presented here on a pegmatite occurring within the Isbjørnhamna metasedimentary rocks. Although the dated zircons are full of inclusions, have high-U contents and are metamict and hence have experienced notable Pb-loss, the new Cryogenian ages are consistent with the age of regional metamorphism of the host metasediments, providing additional evidence for a clear distinction of the Southwestern Province from the other parts of the Svalbard Caledonides.

scholarly journals Primary Minerals and Age of The Hydrothermal Quartz Veins Containing U-Mo-(Pb, Bi, Te) Mineralization in the Majerská Valley near Čučma (Gemeric Unit, Spišsko-Gemerské Rudohorie Mts., Slovak Republic)

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 629
Author(s):  
Štefan Ferenc ◽  
Martin Števko ◽  
Tomáš Mikuš ◽  
Stanislava Milovská ◽  
Richard Kopáčik ◽  
...  
Keyword(s):  
Electron Microprobe ◽  
Slovak Republic ◽  
Mineral Phase ◽  
Quartz Veins ◽  
Hydrothermal Quartz ◽  
Ti Oxides ◽  
Mineral Phases ◽  
Gemeric Unit ◽  
Primary Minerals

An occurrence of vein U-Mo mineralization is located in the Majerská valley near Čučma, about 7 km to the NNE of the district town of Rožňava (Eastern Slovakia). Mineralization is hosted in the acidic metapyroclastics of the Silurian Bystrý Potok Fm. (Gemeric Unit), and originated in the following stages: (I.) quartz I, fluorapatite I; (II.) quartz II, fluorapatite II, zircon, rutile chlorite, tourmaline; (III.) uraninite, molybdenite, U-Ti oxides; (IV.) pyrite I, ullmannite, gersdorffite, cobaltite; (Va.) galena, bismuth, tetradymite, joséite A and B, Bi3(TeS)2 mineral phase, (BiPb)(TeS) mineral phase, ikunolite; (Vb.) minerals of the kobellite–tintinaite series, cosalite; (VI.) pyrite II; (VII.) titanite, chlorite; and (VIII.) supergene mineral phases. The chemical in-situ electron-microprobe U-Pb dating of uraninite from a studied vein yielded an average age of around 265 Ma, corresponding to the Guadalupian Epoch of Permian; the obtained data corresponds with the age of Gemeric S-type granites. The age correlation of uraninite with the Gemeric S-type granites and the spatial connection of the studied mineralization with the Čučma granite allows us to assume that it is a Hercynian, granite-related (perigranitic) mineralization.

In Situ Electron-Microprobe Analyses of Tissue Cultures Grown on Glass

1967 ◽  
Vol 25 ◽  
pp. 126-127
Author(s):  
D. K. Landstrom ◽  
R. I. Johnsson-Hegyeli ◽  
A. F. Hegyeli
Keyword(s):  
Electron Microprobe ◽  
Culture Medium ◽  
Elemental Carbon ◽  
Calf Serum ◽  
Basal Medium ◽  
Carcinoma Cells ◽  
Absolute Methanol ◽  
Horizontal Position ◽  
Tissue Cultures

The electron microprobe has found several applications in medicine and biology. These were recently reviewed by Tousirnis. He and others have shown it to be useful for the localization of Ca, P, Fe, Ag, Zn, Cr, and Sn in normal and diseased tissues. The majority of these studies were conducted on histological sections, several cells thick, with the cells cut in different planes, and overlapping one another.This paper reports on the analysis of cells grown in a horizontal monolayer. The cells are left intact, and are analyzed on the coverslip on which they are grown. L-929 fibroblasts and KB carcinoma cells were grown on 10 x 50-mm Bellco glass coverslips in Leighton tubes. The culture medium was Hanks' Basal medium of Eagle, supplemented with penicillin, streptomycin, and 10 percent calf serum. The cultures were incubated at 37 C in a horizontal position for periods up to 3 days. They were then fixed with absolute methanol for 10 seconds, washed with several changes of distilled water, and dried. The cultures were prepared for analysis by vacuum deposition of 100 A of elemental carbon.

In Situ Metal Imaging and Zn Ligand-Speciation in a Soil-Dwelling Sentinel: Complementary Electron Microprobe and Synchrotron Microbeam X-ray Analyses

2012 ◽  
Vol 47 (2) ◽  
pp. 1073-1081 ◽  
Author(s):  
A. J. Morgan ◽  
J. F. W. Mosselmans ◽  
J. M. Charnock ◽  
A. Bennett ◽  
C. Winters ◽  
...  
Keyword(s):  
Electron Microprobe ◽  
X Ray

The Use of Energy Dispersive X-Ray Microanalysis in the Geological Sciences: 30 Years of Heavy and Creative Application

1998 ◽  
Vol 4 (S2) ◽  
pp. 180-181
Author(s):  
John T. Armstrong
Keyword(s):  
Electron Microprobe ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Energy Dispersive Spectrometer ◽  
Energy Dispersive ◽  
Airborne Particulate ◽  
X Ray ◽  
Introductory Paper ◽  
Geological Sciences

Considering the heavy use by the geological community that followed, it is not surprising that first two authors of the introductory paper in Science on the energy dispersive x-ray spectrometer applied their x-ray microanalysis skills predominantly in the geological sciences. The energy dispersive spectrometer became first commercially available at an ideal time for the geological community. During the 1960’s, mineralogists and petrographers like K. Keil, J.V.P. Long, J.C. Rucklidge, J.V. Smith, A. Albee, and A. Chodos demonstrated that electron microprobe analysis with wavelength dispersive spectrometers could provide accurate in-situ analysis of portions of individual mineral grains on a scale not readily obtainable by other techniques (e.g., 2-3 and cited refs.). The electron microprobe enabled analysis of features observed by reflected- and transmitted-light polarized optical microscopy (prime tools of the mineralogist and petrographer) and was beginning to be used routinely for the study of meteorites and terrestrial rocks and even more exotic types of specimens, like individual microparticles from sediment and airborne particulate samples.

THE USE OF AN ELECTRON MICROPROBE TO MONITOR THE UPTAKE OF CALCIUM AND CHLORIDE IN APPLES

1984 ◽  
Vol 64 (2) ◽  
pp. 349-354 ◽  
Author(s):  
W. P. MOHR ◽  
GWEN M. JAMIESON
Keyword(s):  
Elemental Composition ◽  
Calcium Chloride ◽  
Electron Microprobe ◽  
Chloride Solution ◽  
Chloride Ions ◽  
Calcium Chloride Solution ◽  
Vascular Bundles ◽  
Localized Structures ◽  
Analysis Technique

An electron microprobe was used to follow the uptake and penetration of calcium and chloride ions in apples that had been immersed in calcium chloride solution under vacuum in order to improve storage qualities. After 2 days at 20 °C, Ca and Cl penetrated approximately half way into the apple. After 4 wk at 20 °C, both ions penetrated all the way to the coreline although relatively more Ca than Cl penetrated the inner half of the fruit. Penetration of Ca was slower in fruit held at 2 °C than at 20 °C, while that of Cl was at least as rapid at 2 °C as at 20 °C. This in situ analysis technique was also used to determine the elemental composition of specific localized structures including vascular bundles and lenticels.Key words: Calcium, chloride, apple, electron microprobe

scholarly journals Apatite Chemical Compositions from Acadian-Related Granitoids of New Brunswick, Canada: Implications for Petrogenesis and Metallogenesis

Minerals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 598 ◽  
Author(s):  
Zeinab Azadbakht ◽  
David Lentz ◽  
Christopher McFarlane
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
New Brunswick ◽  
Electron Microprobe ◽  
Inductively Coupled Plasma ◽  
Chemical Compositions ◽  
Inductively Coupled ◽  
Fertility Index ◽  
Plasma Mass Spectrometry

The geochemistry of apatite crystals from fifteen fertile and infertile Acadian-related granitoids of New Brunswick (Canada) was studied in situ, using electron microprobe and laser ablation-inductively coupled plasma-mass spectrometry to further investigate petrogenesis and fertility index among these intrusions. The results indicate a clear geochemical contrast between barren and mineralized samples where apatite grains from barren intrusions are the most hydrous (OH > 0.3 wt. %), with lowest Mn (<1700 ppm), Fe (<800 ppm), and Sn (<0.01 ppm). In contrast, apatite grains from Cu-Mo related intrusions are distinguished by higher Cl (>0.1 wt. %), (La/Yb)N ratios of 21.17, (Eu/Eu*)N ratios of 0.30, and LREE/HREE ratios of 6.03. Apatites from Sn-W related magmatic suites have the highest F (>3 wt. %), Mn (>5350 ppm), Fe (>2200 ppm), Y (>4900 ppm), Sn (>2 ppm), and the lowest Cl (<0.01 wt. %), Sr (<60 ppm), U (<18 ppm), Th (<29 ppm), (Eu/Eu*)N ratios (<0.01), and (La/Yb)N ratios (<0.88). Lastly, apatite grains from Mo-bearing systems have the lowest SiO2 (<0.4 wt. %), Sr (<33 ppm), Th (<28 ppm), a moderate Mn (~3800 ppm), Y (~3500 ppm), and highest FeOt (<0.9 wt. %). However, the results indicated apatite Mn, Sr, LREE/HREE, and (Eu/Eu*)N ratios as the best fertility indices used for discriminating barren from fertile granite intrusions.

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