Electron microprobe investigations of metamorphic reactions and mineral growth histories Kwoiek area, British Columbia by Lincoln Steffens Hollister

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  • Rocks -- Analysis,
  • Mines and mineral resources -- British Columbia

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Statementby Lincoln Steffens Hollister.
The Physical Object
Paginationxv, 210 leaves :
Number of Pages210
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Open LibraryOL13584102M

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Electron microprobe investigations of metamorphic reactions and mineral growth histories, Kwoiek area, British Columbia By Lincoln Steffens Hollister Download PDF (52 MB)Author: Lincoln Steffens Hollister. Chapter Metamorphic Reactions. If we treat isograds as reactions, we can: • Understand what physical variables might • Attempt to equate field/hand specimen mineral assemblages and chemical reactions • Isograd reactions are not so straightforward as.

Electron microprobe (EPMA) Electron microprobe analyses were conducted on a JEOL JXA Superprobe, Electron Probe Micro Analyzer (EPMA), housed at the Department of Earth System Sciences, Yonsei University, Seoul, South Korea.

Core to rim compositions of important mineral assemblages in TS1, TS2 and TS3 were analyzed. Therefore, this study conducted three groups of experiments to explore the metamorphic reactions among blueschist‐facies minerals at conditions corresponding to.

W data that underpin thermobarometric analysis and modeling of P–T histories. The microprobe, with mm-scale spatial resolution, can also characterize compositional zonation in very small. Abstract Interpreting tectonic histories from metamorphic tectonites requires an understanding of the linkages and feedbacks between deformation and metamorphism.

Relationships between deformation. Garnet is one of the most robust and ubiquitous minerals that record element zoning during crustal metamorphism.

In addition to major elements, zoning in trace elements can provide a wealth of information to document the changing conditions of garnet growth and modification. However, mapping trace elements at low concentrations, over large areas and with high resolution has remained a major.

Originally published inthis book covers the closely related techniques of electron microprobe analysis (EMPA) and scanning electron microscopy (SEM) specifically from a geological viewpoint. An electron probe micro-analyzer is a microbeam instrument used primarily for the in situ non-destructive chemical analysis of minute solid samples.

EPMA is also informally called an electron microprobe, or just is fundamentally the same as an SEM, with the added capability of chemical primary importance of an EPMA is the ability to acquire precise, quantitative elemental. 1 Revision 1 2 Microprobe analysis and dating of monazite from the Potsdam 3 Formation, NY: A progressive record of chemical reaction and 4 fluid interaction 5 6 Julien Allaz1,2,*, Bruce Selleck3, Michael L.

Williams1, Michael J. Jercinovic1 7 8 1 Dept. of Geosciences, University of Massachusetts, Amherst, North Pleasant Street, 9 Morrill Science Center, Amherst, MA View growth of quartz candles into a vug or vein and, in some rocks, important information about the P-T-deformation history can be learned from the minerals in the boudin necks: Dislocation Creep.

At low temperature, most rocks deform by cracking and frictional sliding. which aids metamorphic reactions by adding interfacial free energy. Mineral compositions can be measured with an electron microprobe to high accuracy; they can be measured to lower detection limits with an ICP mass spectrometer.

Assessment of reaction textures. The purpose of this step is to identify which minerals are early, which are late, and which are part of. An electron microprobe (EMP), also known as an electron probe microanalyzer (EPMA) or electron micro probe analyzer (EMPA), is an analytical tool used to non-destructively determine the chemical composition of small volumes of solid materials.

It works similarly Electron microprobe investigations of metamorphic reactions and mineral growth histories book a scanning electron microscope: the sample is bombarded with an electron beam, emitting x-rays at wavelengths characteristic to. This book is for senior undergraduate or postgraduate students who want an insight into some modern approaches to metamorphic petrology.

Its aims are to explain, in reasonably simple, informal terms, the processes underlying (i) metamorphic reactions and (ii) the production of micro­ structures in metamorphic rocks, these currently being the things that interest me most, geologically. INTRODUCTION. From the standpoint of petrology, the essence of metamorphism is the chemical reaction among minerals and fluid.

Surprisingly, much remains to be understood about metamorphic mineral reactions, including the role of metasomatism, how and to what extent reactions are overstepped, the controls on the textures of mineral products, and the grain-scale redistribution of.

The reaction chlorite+muscovite=staurolite+biotite+quartz+vapor has been experimentally determined and reversible equilibrium has been demonstrated. At an oxygen fugacity corresponding to that of the FMQ buffer and using a starting mixture with a Mg/Mg+Fe ratio ofthe equilibrium conditions of the reaction are ±15°C at 7 kb and ±15°C at 4 kb.

The preliminary maximum stability of. References.- 3 Kinetics of Metamorphic Reactions.- Diffusion in Metamorphism.- Nucleation and Growth.- Application of Reaction Kinetics to Metamorphism.- Zoning in Metamorphic Minerals.- Problems of Aragonite in Metamorphic Rocks.- Kinetics of the Reaction: Calcite + Quartz.

Wollastonite + CO References.- 4 Reactions in Metamorphic Rocks Metamorphic reactions Reactions in a kaolinite-quartz system. A very simple mineralogical system and its response to changing pressure and temperature provide a good illustration of what occurs in uncomplicated sediment at Earth’s surface, a mixture of the clay mineral kaolinite [Al 4 Si 4 O 10 (OH) 8] and the mineral quartz (SiO 2), provides a good example.

In Val d’Ala (Piedmont, Western Alps, Italy), the more interesting rocks for the mineralogical research are represented by rodingites (rich in mineralized veins and fractures) associated with serpentinites in the eclogitized oceanic crust of Piemonte Zone, south of Gran Paradiso Massif.

Among the vein-filling minerals, garnets are the most appreciated as mineral specimens and, in less degree. At the final stage, the results gained from determination of metamorphic facies based on mineralogical association along with the results from electron microprobe analyses were studied and analyzed using THERMOCALC (Version ) software and temperature and pressure condition for formation of each mineral was determined.

• Metamorphic minerals and rocks provide many valuable resources, marble and slate the two most widely used. • Economically valuable metamorphic minerals include: talc to talcum powder, graphite for pencils and dry lubricant, garnet and corundum for abrasive and.

Pre-metamorphic grains are often destroyed by prograde metamorphic reactions, limiting the extent of isotopic inheritance, and syn-metamorphic monazite is resistant to alteration during peak and retrograde metamorphism, limiting isotopic discordance. Most monazite ages are derived by electron microprobe chemical dating, which is based on.

• Conduct petrography to determine mineral assemblages and select locations for microprobe analyses. • Formally present thesis proposal. Summer • Use electron microprobe at Washington State University GeoAnalytical Laboratory.

• Continue pseudosection modeling and begin THERMOCALC analyses. • Interpret implications of P-T-t data. We report here the results of in situ dating by electron microprobe of Paleozoic authigenic and low-grade monazite and xenotime overgrowths on detrital monazite and zircon, respectively.

Samples are from the Potsdam Formation, a basal sandstone deposited uncomformably on Proterozoic basement of the Adirondack Mountains of New York State.

Applications of electron microscopy in metamorphic and structural geology K. Report on a joint meeting of the Metamorphic Studies Group and Tectonic Studies Group at Burlington House on 24 November The meeting was opened by two introductory talks on the techniques of electron microscopy and microanaly- sis.

Metamorphic Minerals / Reactions The mineral assemblages that occur in metamorphic rocks depend on four factors: The bulk chemical composition of the original rock. The pressure reached during metamorphism. The temperature reached during metamorphism.

The composition of any fluid phase that was present during metamorphism. A partly resorbed rim is not recognized optically but mineral inclusions and a discontinuous chemical composition of garnet are proof of this third garnet growth stage.

Rare earth element distribution patterns of garnet also show clear evidence for discontinuous growth and allow us to identify the reactions responsible for garnet growth. In most metamorphic and igneous environments, boron is incorporated into minerals of the tourmaline supergroup.

In high-grade metamorphic terranes like that of the Adirondack region of northern New York State, uncommon rock compositions combined with unusual and variable geologic conditions resulted in the formation of many additional boron. A metamorphic reaction is a chemical reaction that takes place during the geological process of metamorphism wherein one assemblage of minerals is transformed into a second assemblage which is stable under the new temperature/pressure conditions resulting in the final stable state of the observed metamorphic rock.

Examples include the production of talc under varied metamorphic conditions. Tectonics of metamorphic crystallization. The chemical and physical properties of metamorphic minerals such as garnet and Al2SiO5 polymorphs (andalusite, kyanite, sillimanite) have long been central to petrologic and structural studies of orogeny because these minerals may record the pressure, temperature, strain, and fluid histories of rocks through time.

Metamorphic P-T Studies in the Jan Lake Area, Hanson Lake Block 1 Syed Abbas-Hasanie2, John F. Lew,y2 and Dexter Perkins3 Abbas-Hasanie, S., Lewry, J.F. and Perkins, D. (): Metamorphic PT studies in the Jan Lake area, Hanson Lake Block; in Summary of InvestigationsSaskatchewan Geological Survey, Sask.

Energy Mines, Misc. Rep. Compositions of feldspar and other major minerals were measured by a Cameca SX electron microprobe, using 15 kV voltage, 10 nA beam current and 1 µ m spot size. The ZAF (atomic number, absorption and fluorescence correction) correction scheme provided by Cameca was used.

Forward modeling of the effects of mixed volatile reaction, volume diffusion, and formation of submicroscopic exsolution lamellae on calcite-dolomite thermometry T homas m üller, 1, * l ukas P.

B aumgar T ner, 1 C. T om F os T er J r., 2 and g regory T. r oselle 3. Metamorphic rock - Metamorphic rock - Retrograde metamorphism: In general, the changes in mineral assemblage and mineral composition that occur during burial and heating are referred to as prograde metamorphism, whereas those that occur during uplift and cooling of a rock represent retrograde metamorphism.

If thermodynamic equilibrium were always maintained, one might expect all the reactions. Dr Robert Sturm (Austria) The mineral zircon (more correctly, orthosilicate zircon or ZrSiO 4) is an important accessory mineral in various rocks of the earth’s crust, but most of all of igneous rocks with the mineral composition of granite.

An accessory mineral is a mineral comprising less than about 10% of a rock and which therefore plays little or no role in naming or classifying that rock. Spear, F.S. () The Gibbs method and Duhem's theorem: The quantitative relationships among P, T, chemical potential, phase composition and reaction progress in igneous and metamorphic systems.

Contributions to Mineralogy and Petrology, 99, Jercinovic is director of the UMass Geosciences Electron Microprobe/Scanning Electron Microscope facility. His general research interest is on electron probe micro-analyzer (EPMA) in minor and trace element applications, useful in such diverse fields as tectonics, igneous and metamorphic petrology, meteoritics, chemical engineering, and climate.

A combined scanning electron microscope, electron microprobe, and Raman spectroscopic study allow us to reclassify Dhofar as an S5/S6 strongly shocked chondrite, and to present new textural observations and compositional data that provide additional insight into the formation of ringwoodite during a hypervelocity impact event experienced.

using the electron microprobe at Washington University. WESTERN METAMORPHIC BELT The western metamorphic belt underwent a complex history of deformation, metamorphism, and plutonism that ranges in age from about Ma to about 50 Ma (Crawford and others, ; Brew and others, ).

The belt varies. Here are some examples of metamorphic reactions of different types. Each has mineralogical and textural evidence that a particular reaction was taking place, or had taken place, during metamorphism. Remember that reactions are not spelled out for you, even in very pretty thin sections.

You have to interpret their occurrence from the evidence. Electron microprobe total Th-U-Pb chemical ages for selected tributary monazite grains also analyzed by ion microprobe reveal additional monazite growth events (i.e., metamorphic reaction) at – Ma and – Ma.

Tributary and French Broad River zircon age spectra are dominated by Mesoproterozoic and Ordovician grains.Stanton [42,43] has shown that diffusion during regional metamorphism has been restricted to relatively minute distances (metamorphic mineral reactions, so that metamorphic equilibrium does not appear to .ELECTRON MICROPROBE RESULTS.

The extensive chemical investigation - analyses, of the harzburgite minerals - olivine, orthopyroxene, tremolite, chlorite and spinel, by electron microprobe led to the detailed description and to an advanced understanding of the metamorphic processes involved.

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