The Kulyk Lake monazite deposit, northern Saskatchewan

1976 ◽  
Vol 13 (3) ◽  
pp. 470-475 ◽  
Author(s):  
David H. Watkinson ◽  
Paul R. Mainwaring
Keyword(s):  
Chemical Composition ◽  
Aqueous Phase ◽  
Rare Earths ◽  
Microprobe Analysis ◽  
Granitic Rocks ◽  
Lake Area ◽  
Fold Belt ◽  
Ti Oxides ◽  
Northern Saskatchewan ◽  
Silicate Rocks

Massive monazite occurs in a zoned deposit in the Wollaston Lake fold belt, Kulyk Lake area, northern Saskatchewan. The deposit is enclosed by pegmatitic, graphic, and aplitic granite, which are slightly bleached adjacent to the contact. Ilmeno-hematite and hematite (in part after magnetite), located adjacent to the silicate rocks, are followed inward by massive monazite and then minor concentrations of apatite. Monazite has a constant chemical composition: the average microprobe analysis is CaO—0.5, La2O3—15.1, Ce2O3—36.1, Pr2O3—4.9, Nd2O3—10.1, ThO2—4.3, P2O5—27.8; total, 98.8%. Monazite grains in a small segregation in granitic gneisses have variable thoria contents. Apatite in the deposit contains about 0.2% total rare earths. The oxide–monazite–apatite deposit probably precipitated from an aqueous phase generated during crystallization of a water-rich granitic liquid. The monazite deposit and enclosing granitic rocks may have been generated during anatexis of a metasedimentary unit containing abundant monazite and Fe–Ti oxides.

ROOM TEMPERATURE MAGNETIC ANOMALIES IN BENZENE TREATED Bi–Pb–Sr–Ca–Cu–O POWDER

1991 ◽  
Vol 05 (21) ◽  
pp. 1447-1456 ◽  
Author(s):  
A. R. HARUTUNYAN ◽  
L. S. GRIGORYAN ◽  
A. S. KUZANYAN ◽  
A. A. KUZNETSOV ◽  
A. A. TERENTIEV ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Chemical Composition ◽  
Room Temperature ◽  
Microprobe Analysis ◽  
Magnetic Anomalies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Two Samples ◽  
Field Dependent ◽  
History Of

Two samples of benzene-treated Bi–Pb–Sr–Ca–Cu–O powder exhibited at 300 K magnetic field dependent diamagnetism and magnetization irreversibility. The treatment with benzene resulted also in the appearance of microwave absorption at low magnetic fields, while is sensitive to magnetic history of the sample. From X-ray diffraction data one can see that upon benzene treatment the reflections of 85 K and 110 K phases do not change practically, but a series of new reflections appeared, indicating a lattice modulation with 4.9 nm periodicity. A microprobe analysis revealed substantial inhomogeneity of chemical composition across the samples. The room temperature anomalies were weakened in one sample and vanished in the second upon thermal cycling.

scholarly journals Preparation of Thin Sections

1998 ◽  
Vol 6 (7) ◽  
pp. 8-9
Author(s):  
Ian Chaplin
Keyword(s):  
Chemical Composition ◽  
Thin Section ◽  
Microprobe Analysis ◽  
Rock Sample ◽  
Rock Type ◽  
X Rays ◽  
Thin Sections ◽  
Economical Method ◽  
Optical Examination ◽  
Composition Of Minerals

The optical examination of a rock sample in thin section is the quickest and most economical method for classifying rock type and determining which analytical route to follow.Thin sections for transmitted light are the most common, but there are also:Polished Thin Sections • Polished sections are used for classification and identification of minerals that cannot be determined in standard thin sections. They are also essential for microprobe analysis. Minute mineral grains are analyzed by bombarding them with a focused bean of electrons, which generate x-rays, characteristic of the elements within the grains. X-rays are identified and quantified to determine the chemical composition of minerals.

scholarly journals Nitrogen behavior in the shallow groundwater–soil system within agricultural landscapes

2019 ◽  
Vol 98 ◽  
pp. 01046 ◽  
Author(s):  
Evgeniya Soldatova ◽  
Yihui Dong ◽  
Jiale Li ◽  
Zhanxue Sun
Keyword(s):  
Chemical Composition ◽  
Shallow Groundwater ◽  
Agricultural Landscapes ◽  
Soil Horizon ◽  
Lake Area ◽  
Soil Composition ◽  
Soil System ◽  
Private And Public ◽  
Poyang Lake Area ◽  
N Compounds

The research is devoted to the analysis of the changes in the chemical composition of shallow groundwater within the agricultural landscapes of the Poyang Lake area taking into account the peculiarities of soil composition. The analysis is based on field data collected during 2011–2017 by the sampling of the shallow groundwater from the private and public wells and adjoining soils. Correlations between the content of the N-compounds and the Eh values in autumn as well as a relationship of the NH4+ concentration with the DOC content reflect the processes of the organic matter transformation in the aquifer. Correlations between the N content in the upper soil horizon and the concentrations of the N-compounds in the shallow groundwater indicate a strong connection of the origin of the groundwater chemical composition with the soil composition.

Rb–Sr geochronology and metamorphic history of Proterozoic to early Archean rocks north of the Cape Smith Fold Belt, Quebec

1987 ◽  
Vol 24 (4) ◽  
pp. 813-825 ◽  
Author(s):  
Ronald Doig
Keyword(s):  
Volcanic Rocks ◽  
Granitic Rocks ◽  
Iron Formation ◽  
Fold Belt ◽  
Metasedimentary Rocks ◽  
Metamorphic History ◽  
The North ◽  
Basement Rocks ◽  
History Of ◽  
Wide Zone

The Churchill Province north of the Proterozoic Cape Smith volcanic fold belt of Quebec may be divided into two parts. The first is a broad antiform of migmatitic gneisses (Deception gneisses) extending north from the fold belt ~50 km to Sugluk Inlet. The second is a 20 km wide zone of high-grade metasedimentary rocks northwest of Sugluk Inlet. The Deception gneisses yield Rb–Sr isochron ages of 2600–2900 Ma and initial ratios of 0.701–0.703, showing that they are Archean basement to the Cape Smith Belt. The evidence that the basement rocks have been isoclinally refolded in the Proterozoic is clear at the contact with the fold belt. However, the gneisses also contain ubiquitous synclinal keels of metasiltstone with minor metapelite and marble that give isochron ages less than 2150 Ma. These ages, combined with low initial ratios of 0.7036, show that they are not part of the basement, as the average 87Sr/86Sr ratio for the basement rocks was about 0.718 at that time.The rocks west of Sugluk Inlet consist mainly of quartzo-feldspathic sediments, quartzites, para-amphibolites, marbles, and some pelite and iron formation. In contrast to the Proterozoic sediments in the Deception gneisses, these rocks yield dates of 3000–3200 Ma, with high initial ratios of 0.707–0.714. These initial ratios point to an age (or a provenance) much greater than that of the Archean Deception gneisses. The rocks of the Sugluk terrain are intruded by highly deformed sills of granitic rocks with ages of about 1830 Ma, demonstrating again the extent and severity of the Proterozoic overprint. The eastern margin of this possibly early Archean Sugluk block is a discontinuity in age, lithology, and geophysical character that could be a suture between two Archean cratons. It is not known if such a suturing event is of Archean age, or if it is related to the deformation of the Cape Smith Fold Belt.Models of evolution incorporating both the Cape Smith Belt and the Archean rocks to the north need to account for the internal structure of the fold belt, the continental affinity of many of the volcanic rocks, the continuity of basement around the eastern end of the belt, and the increase in metamorphism through the northern part of the belt into a broad area to the north. The Cape Smith volcanic rocks may have been extruded along a continental rift, parallel to a continental margin at Sugluk. Continental collison at Sugluk would have thrust the older and higher grade Sugluk rocks over the Deception gneisses, produced the broad Deception antiform, and displaced the Cape Smith rocks to the south in a series of north-dipping thrust slices.

Simulation of the Chemical Influences to the Polishing Process of Optical Glasses

2008 ◽  
Vol 39-40 ◽  
pp. 293-298
Author(s):  
Elisabeth Becker ◽  
Andreas Prange ◽  
Reinhard Conradt
Keyword(s):  
Chemical Composition ◽  
Thermodynamic Parameters ◽  
Aqueous Phase ◽  
Fluid Phase ◽  
Colloidal System ◽  
Polishing Process ◽  
Optical Glasses ◽  
Solubility Products ◽  
The Stability ◽  
The Impact

In the last step of fabrication, optical and fine-optical glasses are polished to fulfill the optical requirements for their surfaces. The major influences on the process are caused by the mechanics of the polishing machine, by the chemistry (composition of the glass, as well as the polishing suspension of water and polishing grains, CeO2) [1], [2] and by the material and structure of the polishing pad. From previous own results [3], [4] it is known that the stability of the colloidal system has a major impact on the polishing results and that it is influenced by matter from the glass removal. Thus the glasses have been classified in glass families, depending on their chemical composition and their mutual compatibility in the process. As it is not always possible to measure this compatibility, the impact of the various dissolved glass ions in the fluid phase of the polishing suspension is simulated by the use of thermodynamic parameters. Therefore the specific solubility products in the aqueous phase are modeled (using, e.g., the software HSC) comprising steady accumulation of ions from the glass removal. With this simulation, the examination of the chemical part of the chemo-mechanical polishing process will be concluded.

Magnetic susceptibility of a saprolite and a soil profile developed on pyroxenite at Mont-Saint-Bruno, Quebec, Canada

2001 ◽  
Vol 81 (2) ◽  
pp. 185-192
Author(s):  
C R De Kimpe ◽  
J. Dejou ◽  
Y. Chevalier
Keyword(s):  
Particle Size ◽  
Magnetic Susceptibility ◽  
Chemical Composition ◽  
Key Words ◽  
Soil Profile ◽  
Additional Information ◽  
Fe Oxides ◽  
Ti Oxides ◽  
Opaque Minerals ◽  
High Magnetic Susceptibility

Magnetic susceptibility (χ) measurements were performed with a recording magnetic susceptivimeter on a pyroxenite and its alteration products, i.e., a saprolite and the horizons of a soil profile. Pyroxenite contains a relatively high percentage of opaque minerals that, under alteration, transformed partly into Fe oxides with a high magnetic susceptibility. In the saprolite and the soil, χ values varied according to depth in the profile, particle size, mineralogical and chemical composition. Significant correlations between χ values and Fe and Ti oxides indicated the importance of opaque minerals, magnetite, maghemite and ilmenite to the magnetic susceptibility of the alteration products of the pyroxenite. This method provided additional information on the intensity of the alteration of the rock, especially on the formation of secondary Fe oxides at the expense of the ferromagnesian minerals. Key words: Magnetic susceptibility, pyroxenite, saprolite, maghetite, maghemite, opaque minerals

Composition, age, and origin of granitoid rocks in the Davin Lake area, Rottenstone Domain, Trans-Hudson Orogen, northern Saskatchewan

2005 ◽  
Vol 42 (4) ◽  
pp. 599-633 ◽  
Author(s):  
D Barrie Clarke ◽  
Andrew S Henry ◽  
Mike A Hamilton
Keyword(s):  
Granitic Rocks ◽  
Lake Area ◽  
Granitoid Magmatism ◽  
Metasedimentary Rocks ◽  
Metavolcanic Rocks ◽  
Granitic Magmatism ◽  
Deformation Features ◽  
High Grade Metamorphism ◽  
Granitoid Rocks ◽  
Host Rocks

The Rottenstone Domain of the Trans-Hudson orogen is a 25-km-wide granitic–migmatitic belt lying between the La Ronge volcanic–plutonic island arc (1890–1830 Ma) to the southeast and the ensialic Wathaman Batholith (1855 Ma) to the northwest. The Rottenstone Domain consists of three lithotectonic belts parallel to the orogen: (i) southeast — gently folded migmatized quartzo-feldspathic metasedimentary and mafic metavolcanic rocks intruded by small concordant and discordant white tonalite–monzogranite bodies; (ii) central — intensely folded and migmatized metasedimentary rocks and minor metavolcanic rocks intruded by largely discordant, xenolith-rich, pink aplite-pegmatite monzogranite bodies; and (iii) northwest — steeply folded migmatized metasedimentary rocks cut by subvertical white tonalite–monzogranite sheets. Emplacement of granitoid rocks consists predominantly of contiguous, orogen-parallel, steeply dipping, syntectonic and post-tectonic sheets with prominent magmatic schlieren bands, overprinted by parallel solid-state deformation features. The white granitoid rocks have A/CNK (mol Al2O3/(mol CaO + Na2O + K2O)) = 1.14–1.22, K/Rb ≈ 500, ΣREE (sum of rare-earth elements) < 70 ppm, Eu/Eu* > 1, 87Sr/86Sri ≈ 0.7032, and εNdi ≈ –2. The pink monzogranites have A/CNK = 1.11–1.16, K/Rb ≈ 500, ΣREE > 90 ppm, Eu/Eu* < 1, 87Sr/86Sri ≈ 0.7031, and εNdi ≈ –2. The white granitoid rocks show a wider compositional range and more compositional scatter than the pink monzogranites, reflecting some combination of smaller volume melts, less homogenization, and less control by crystal–melt equilibria. All metavolcanic, metasedimentary, and granitic rocks in the Rottenstone Domain have the distinctive geochemical signatures of an arc environment. New sensitive high-resolution ion microprobe (SHRIMP) U–Pb geochronology on the Rottenstone granitoid rocks reveals complex growth histories for monazite and zircon, variably controlled by inheritance, magmatism, and high-grade metamorphism. Monazite ages for the granitoid bodies and migmatites cluster at ~1834 and ~1814 Ma, whereas zircon ages range from ~2480 Ma (rare cores) to ~1900–1830 Ma (cores and mantles), but also ~1818–1814 Ma for low Th/U recrystallized rims, overgrowths, and rare discrete euhedral prisms. These results demonstrate that at least some source material for the granitic magmas included earliest Paleoproterozoic crust (Sask Craton?), or its derived sediments, and that Rottenstone granitic magmatism postdated plutonism in the bounding La Ronge Arc and Wathaman Batholith. We estimate the age of terminal metamorphism in the Davin Lake area to be ~1815 Ma. Petrogenetically, the Rottenstone migmatites and granitoid rocks appear, for the most part, locally derived from their metasedimentary and metavolcanic host rocks, shed from the La Ronge Arc, Sask Craton, and possibly the Hearne Craton. The Rottenstone Domain was the least competent member in the overthrust stack and probably underwent a combination of fluid-present melting and fluid-absent decompression melting, resulting in largely syntectonic granitoid magmatism ~1835–1815 Ma, analogous to granite production in the High Himalayan gneiss belt.

scholarly journals The distribution of Cu across three basaltic lava flows from the Faeroe Islands

1982 ◽  
Vol 31 ◽  
pp. 1-10
Author(s):  
Aage Jensen
Keyword(s):  
Spectral Analysis ◽  
Atomic Absorption ◽  
Electron Microprobe ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Fluorescence Analysis ◽  
Lava Flows ◽  
Absorption Analysis ◽  
X Ray ◽  
Ti Oxides

The distribution of Cu across lava flows has been investigated by using a combination of several different analytical methods on samples taken along two profiles across each of three flows: one from the lower series, one from the middle series, and one from the upper series of the Faeroe Islands basalts. The profiles comprise 97 samples, all of which have been investigated by X-ray fluorescence analysis, atomic absorption analysis, and microscopic analysis. Furthermore some of the samples have been investigated by microchemical analysis, spectral analysis, and electron microprobe analysis. Spectral analysis has also been carried out on separates from selected samples. The total amount of Cu present in the samples has been determined by X-ray fluorescence analysis. The amount of Cu lattice-bound in Fe-Ti-oxides, pyroxenes and plagioclases has been determined as the difference between total Cu and Cu values obtained by atomic absorption analysis carried out on solutions obtained by using weak solvents which do not dissolve lattice-bound Cu in minerals not having Cu as a major element. Electron microprobe analysis has shown that the amount of Cu lattice-bound in Fe-Ti-oxides, pyroxenes and plagioclases increases with increasing oxidation, with an abrupt increase coincident with the formation of pseudobrookite. Where pseudobrookite is present most of the Cu is lattice-bound, but where the oxidation during initial cooling has not resulted in the formation of pseudobrookite, most of the Cu ends up loosely held in the rock in the same manner as cations in zeolites, but in many of the samples a smaller part of the Cu forms native copper and Cu-bearing sulphides.

scholarly journals INFLUENCE OF WATER MINERALIZATION ON ZOOPLANKTON PRODUCTIVITY IN RESERVOIRS OF AKMOLA REGION

2020 ◽  
Vol 17 (34) ◽  
pp. 520-527
Author(s):  
Gulzhan AUBAKIROVA ◽  
Zhanat ADILBEKOV ◽  
Serik NARBAYEV
Keyword(s):  
Chemical Composition ◽  
Natural Waters ◽  
Aquatic Organisms ◽  
Zooplankton Biomass ◽  
Zooplankton Abundance ◽  
Lake Area ◽  
Water Mineralization ◽  
Predominant Component ◽  
Composition And Structure ◽  
Influence Of Water

The effect of water mineralization on zooplankton productivity in the reservoirs of the Akmola region is a very relevant study. The chemical composition of natural waters is inextricably linked to the composition and structure of the soil, which, in turn, was formed during the long evolution of the earth's crust under the influence of climate. Natural waters have a wide variety of qualitative and quantitative chemical composition. The basis for systematization in existing classifications are the amount of mineralization, the predominant component or group, the relationship between different values of concentrations of various ions, the presence of increased amounts of any specific elements of the gas and salt regimes. The relevance of the work is due to insufficient study of the fishing potential of medium-sized reservoirs in Northern Kazakhstan. The work aimed to study the mineralization of water as a factor determining the life of aquatic organisms. As a result of this research, data confirmed the position that the factors that determine the viability of marine organisms are the mineralization of water. To characterize zooplankton across the entire lake area, samples were taken, taking into account different stations. The number of individual organisms in the sample was determined. The degree of mineralization of lakes in the Akmola region was indicated. The correlation coefficient for features in the "mineralization – zooplankton abundance" pair was calculated as r = -0.96, and in the "mineralization – zooplankton biomass" pair r = -0.85. When analyzing the data obtained, it was observed an inverse relationship between water mineralization and zooplankton abundance. When water mineralization increases by 4.03% in July, the number of zooplankton organisms decreases from 170.03 to 152.6 thousand copies/m3. When the salinity of the Uyali - Shalkar lake water increases from 362 (May) to 508 mg/L (July), the zooplankton biomass decreases from 6.02 to 5.73 mg/m3.

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