We show how microtextures can be used as provenance indicators in arkosic siliciclastic rocks, using examples from the Fulmar Formation, a reservoir rock in the Upper Jurassic Humber group in the Central North Sea, in which feldspar dissolution is a major source of secondary porosity.
phenocrysts set in a fine grained groundmass of quartz and feldspar. The porphyritic texture reflects a rapid increase in the cooling rate of the magma during crystallization that can be attributed to intrusion of the partially crystallized magma into relatively cold Rush Lake Granite at shallow levels in the crust.
Cathodoluminescence (CL) of feldspars is an important tool in interpreting genetic conditions of rock formation and alteration (Marshall 1988). Furthermore, feldspars are widely used as dosimeters in dating geological and archaeological materials by thermally or optically stimulated luminescence (TL, OSL).
Cathodoluminescence (CL) has developed into powerful method for a vestigations in the a lot of in geosciences during the last decades. Distinct luminescence properties of certain minerals such as elements (diamond), sulphides (sphalerite), oxides (periclase, corundum, cassiterite), halides (fluorite, halite), sulphates
The eastern part of the basin is characterised by the addition of detrital chlorite and muscovite, some clearly replacing potassium feldspar in retrograde metamorphic lithoclasts, the lack of plutonic quartz, and an increase in polycrystalline metamorphic quartz.
These correlations can be fitted by an exponential curve, where the gradients differ between the alkali feldspars studied, and are largest for the microcline, followed by the orthoclase and then the sanidine. The intensity at eV has the potential to be used in geodosimetry and geochronometry
Cathodoluminescence (CL) characteristics of alkali feldspars may be changed drastically by fluid interaction including alkali metasomatic alteration ( Mariano, 1988), and this textural change may be used as a firstorder gauge of the amount of fluid interaction a sample has under gone.
Normal transmitted and reflected light microscopy, as well as SEM backscattered or cathodoluminescence (CL) imagery were used to determine the zircon internal structures prior to analysis. Petrology, geochemistry, and UPb (zircon) age of the quartzfeldspar ...
The use of characteristic Xray emission for analysis of mineral specimens began with the development of the electron probe in the early 1960's. Cathodoluminescence (CL) observations were a byproduct of this work and soon became a very important independent area of study, leading to the development of simpler, microscopemounted, electron beam sources using a cold cathode as the source of the .
CCD by QImaging is used to acquire images, with feldspar rich granitoid rocks typically being collected for 4–8 s. A large gem zircon standard is used for color correction if necessary. 1. OPTICAL CL IN FELDSPARS: Bombarding the surface of a feldspar grain with highenergy electrons from a cathode source excites electrons within conduction
Aug 19, 2009· Dhofar 019 is classified as an olivine‐bearing basaltic shergottite and consists of subhedral grains of pyroxene, olivine, feldspar mostly converted to maskelynite and minor alkali feldspar. The CL spectrum of its maskelynite exhibits an emission band at around 380 nm.
feldspar with rare apatite inclusions, quartz phenocrysts as well as minor ilmenite, rutile and zircon, all within a groundmass of feldspar and quartz. High wholerock K/Na and Rb/Sr ratios and textural evidence from cathodoluminescence (CL) imaging indicate that the dyke underwent hydrothermal alteration; however, immobile Zr vs TiO 2 for the Ben
Potash Feldspar. This is one of the main feldspars used in the ceramic industry in North America. It is used in industries such as abrasives, sanitary ware, floor and wall tile, dinnerware, pottery, and electrical porcelain. It is a ceramic grade, high potash feldspar and is .
Integrated cathodoluminescenceaided study of microtextures and mineral chemistry of feldspars a powerful tool for deciphering the origins of hybrid granitoid rocks. Examples from the Central Bohemian Pluton, Czech Republic
A collection of 42 feldspar mineral samples from a wide geographical range of North America was examined by coldcathode cathodoluminescence (CL) spectroscopy. Characteristic wavelength peaks, which were determined to be independent of geographic origin, were .
KEYWORDS:apatite, raremetal deposits, cathodoluminescence, traceelements, rare earth elements. Introduction APATITE (general formula Ca 5[(PO 4) 3(OH,F,Cl)]) is an important accessory mineral in various types of igneous, sedimentary and metamorphic rocks. Due to chemical substitutions within the apatite lattice, the Ca2+ sites can be occupied by a
CATHoDoLuMINESCENCE INSTRUMENTATIoN Cathodoluminescence is a valuable tool for the examination of carbonatites and alkaline rocks. It can be used to identify the mineral species in a complex assemblage and to reveal subtle aspects of geochemistry and petrology (Mariano 1978, 1988, Roeder et ). A Nuclide Luminoscope was employed as the elec
Amazonstone is a variety of microcline that has a distinctive bright green color and is used as jewelry or as ornamental stone. Perthite is another gemstone feldspar variety that consists of thin alternating bands of potassium feldspar and plagioclase that gives the mineral sample a distinctive striped pattern. ^ Top
Cathodoluminescence of highpressure feldspar minerals as a shock barometer Masahiro KAYAMA 1,2*, Toshimori SEKINE3,4, Naotaka TOMIOKA 5, Hirotsugu NISHIDO6, Yukako KATO3, Kiyotaka NINAGAWA7, Takamichi KOBAYASHI8, and Akira YAMAGUCHI 9,10 1Department of Earth and Planetary Materials Science, Graduate School of Science, Tohoku University, Sendai, Japan
Cathodoluminescence imaging and titanium thermometry in metamorphic quartz ... red, green and blue filters that can be used to generate ... garnetþ biotiteþ AlSi þKfeldspar þquartz þ H 2O ¼ melt In the melting region, quartz will be consumed by melting reactions such as
Normal transmitted and reflected light microscopy, as well as SEM backscattered or cathodoluminescence (CL) imagery were used to determine the zircon internal structures prior to analysis. Petrology, geochemistry, and UPb (zircon) age of the quartzfeldspar ...
and Planetary Sciences, namely to the cathodoluminescence spectroscopy and microscopy. This technique enables us to receive new data, which contribute greatly to our fundamental knowledge of planets and may be practically used as an insitu Planetary Cathodoluminescence Spectroscopy for the planetary exploration robotic missions in the near future.
Apr 01, 2007· This paper reports on the cathodoluminescence (CL) and radioluminescence (RL) emission properties of wellcharacterised Krich feldspar ( K Na Al Si O 8 ) . Both CL and RL spectra display three groups of components in the: (i) UV (290 nm); (ii) green (570 nm) and (iii) redIR (640 nm) region.