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Start studying Rocks and Minerals. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ... often near the level of contact with sedimentary rock layer. Also in hydrothermal replacement deposits and the oxidation zone of sulfide deposits. ... both as a primary and secondary mineral. Mainly in hydrothermal metamorphic ...
The replacement of plagioclase feldspars by albite: Observations from hydrothermal experiments ... between large-scale albitisation and secondary ore mineralisation which is common in nature ...
breakage and deformation of plagioclase and other primary mineral grains prior to K-feldspar replacement of the plagioclase (Putnam and Alfors, 1969). Fig. 11. Location of the Rocky Hill stock and simplified geologic map (modified after Putnam and Alfors, 1969).
The replacement of plagioclase feldspars by albite: observations from hydrothermal experiments ... primary mechanism of mineral replacement reactions in the presence of a fluid phase (Putnis 2002). Recently, several ... the replacement of plagioclase by albite occurs via an
introduced K begins to recrystallize in the plagioclase lattice as a K-feldspar, the residual Si and Al atoms become re-ordered, distorting the lattice and producing the gridiron twinning characteristic of microcline. In that way, primary triclinic microcline is formed naturally from the primary triclinic plagioclase rather than by
- light-colored, high SiO2 content. Cool and crystallize at lowest temperatures - 700° C. - High in K, Na, AlAs. Amount of K-feldspar increases, amount of Plagioclase decreases.Quartz, Feldspar (K-feldspar > Plagioclase) o Plagioclase is Na - rich. Micas - Biotite and Muscovite
Impact-induced replacement of plagioclase by K-feldspar in granitoids and amphibolites at the Kärdla Crater, Estonia ... main secondary minerals are orthoclase, replacing plagioclase in granites ...
Barium is an important component in replacement of plagioclase by K-feldspar were hydrothermal systems, and Ba-feldspar (celsian) can thus strongly controlled by the mineralogical composition form solid solution with orthoclase in secondary K-feldspar of .
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2. Abstract. I. Introduction. Pseudomorphous replacement is replacement in which a secondary mineral inherits some combination of external and/or internal morphological and textural features of the primary mineral it replaces (e.g., crystal form, inclusions).
Jan 08, 2010· 2.09.9.4 Plagioclase. ... it is a primary igneous phase in type B CAIs, ... chlorite, and, possibly, smectite in the upper 1 m of the tailings. At this site, there is evidence of secondary replacement of other aluminosilicates, namely, plagioclase, cordierite, and amphibole. At Sherridon, the first appearance of biotite occurs at 72 cm, which ...
L.G. Collins explains the formation of myrmekite by: the K-metasomatic replacement of deformed primary plagioclase by secondary K-feldspar; different varieties of Ca- and Na-Ca-metasomatism acting mainly upon deformed primary alkali feldspar, an exception being the replacement of deformed plagioclase in anorthosite. See also. Granophyre
BSE images and combined EDX analyses of cross sections throughout the crystals indicate pseudomorphic replacement of the original plagioclase by an albite-rich feldspar composition (Fig. 2). The replacement advanced from the grain surfaces and along pre-existing cracks inwards into the crystal, so that the product albite is located in a rim ...
Feldspar Alteration and Diagenetic Characteristics of the Parsora Sandstones, Son Basin, India ... Late diagenesis involved neoformation of primary or secondary matrix, illitisation of montmorillonite and muscovite authigenesis. ... and much of the feldspar had been transformed as kaolinite due to its prolonged replacement in the acidic pore ...
May 30, 2002· Secondary plagioclase can be distinguished from igneous plagioclase by the lower K 2 O content in the secondary Na-feldspar. This is shown in a graph displaying log K 2 O content versus anorthite content of feldspars from 800 m depth where micrometer-sized Na-feldspar and K-feldspar crystals clearly deviate from the magmatic trend ( Fig. 5b ).
Lithos, 17 (1984) 247-258 247 Elsevier Science Publishers B.V., Amsterdam - Printed in The Netherlands Replacement of pyroxene by hornblende, isochemically balanced with replacement of plagioclase by garnet, in a metagabbro of upper-amphibolite grade H.W. BARINK Institute of Earth Sciences, Free University, De Boelelaan 1085, 1007 MC Amsterdam (The Netherlands) LITHOS Barink, H.W., 1984.
(b) In a sample from 800 m, the igneous plagio- clase is less zoned and the appearance of secondary feldspar can be con¢rmed (¢ve fragments analysed). (c) Analyses of sample from 2000-m depth show three compositional clusters representing igneous plagioclase, secondary Na-rich plagioclase and K .
K-feldspar is more resistant to CO 2-induced alteration. The circulation of aqueous fluids results in decomposition of primary oligoclase into albite and clinozoisite. Secondary K-feldspar exsolved as small independent grains on the rim of the primary oligoclase, if the primary plagioclase was enriched in the orthoclase component.
Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of minerals and make up approximately 90 percent of the Earth's crust.. In mineralogy, silica (silicon dioxide) SiO 2 is usually considered a silicate mineral. Silica is found in nature as the mineral quartz, and its polymorphs.. On Earth, a wide variety of silicate minerals ...
Hydrothermal alteration of plagioclase in granitic rocks from Proterozoic basement of SE Sweden ... secondary K-feldspar versus albite presented in this work ... intergrowths on primary grain ...
Request PDF on ResearchGate | The influence of NaCl-H 2 O fluids on reactions between olivine and plagioclase: An experimental study at 0.8 GPa and 800–900 °C | The lower to middle continental ...
The replacement of primary green luminescent andesine-labradorite (An39-50Ab47-58Or2–3) by weakly-luminescent to dark-brown luminescent secondary albite (Ab ̴ 99 mol%) was related to the CO2 ...
Impact-induced replacement of plagioclase by K-feldspar in granitoids and amphibolites at the Kärdla Crater, Estonia. Authors; Authors and affiliations ... in addition to medium- to coarse-grained microcline present in primary rocks. SEM, EDS and EPMA studies reveal that the main secondary minerals are orthoclase, replacing plagioclase in ...
why the secondary origin for K-feldspar by replacement of plagioclase is possible and expected. Applications of experiments to geologic terranes The application of the overlooked experiments by Wyart and Sabatier (1956), which show that triclinic microcline is formed directly by K-metasomatism of plagioclase, is far reaching.
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