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Hydrothermal replacement of feldspars in igneous enclaves of the Velay ...
Abstract Hydrothermal circulations through the Velay granite, France, induced extensive mineral reactions in some of its igneous enclaves. K-feldspar is partly or completely replaced by myrmekite-like quartz-plagioclase intergrowths (QPI) and primary plagioclase by secondary, quartz-free plagioclase.
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Mineralogical, Geochemical, and Nd-Sr Isotope Characteristics of ...
In many cases, the primary oligoclase-andesine is replaced by secondary plagioclase from higher Na composition to albite (An 2-10) or albite-epidote-sericite aggregate. Amphibolites containing mainly sodic plagioclase are characterized by the presence of quartz and mentioned above trend of amphibole toward the tremolite/ferroactinolite ...
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Oligocene calc-alkaline lamprophyres and K-rich association in the ...
The large spherolites with nepheline and K-feldspar intergrowth document replacement of the primary leucite in Lar's leucitites. 3.2. ... The high K 2 O value ... minor differences in the mineralogy and geochemistry of the analyzed samples allow us to ascertain the role of primary and secondary magmatic processes, for instance, source ...
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Myrmekite formed by Na- and Ca-metasomatism of K-feldspar
2. REPLACEMENT OF PRIMARY PLAGIOCLASE BY SECONDARY K-FELDSPAR AND MYRMEKITE L. G. Collins Geology 1996 ISSN 1526-5757 2. REPLACEMENT OF PRIMARY PLAGIOCLASE BY SECONDARY K-FELDSPAR AND MYRMEKITE Lorence G. Collins email: lorencec@sysmatrix November 21, 1996; revised February 17, 1997 The following. Expand 3 PDF
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Burial metamorphic rocks from Fiji - tandfonline
In other basalts the primary plagioclase ranged from An ... (Crook, 1960b), where replacement of calcic plagioclase by albite can be demonstrated. Potash feldspar: Possible newgrowths of K-feldspar, which may however ... In many rocks from the Wainimala Series secondary sericite appears within the detrital or pyrogenic plagioclase. It occurs as ...
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THn AuERTcAN MrxpRAlocrsr - Mineralogical Society of America
2 Fersman, A E., Ueber die Natur derPegmatitbildungen: Compt Rend.,Acod,-Sci. Russie, pp. 89-92, 1924. ... grains are commonly set in a finer-grained secondary matrix com-posed of fragments of the adjacent primary grains. The plagio- ... plagioclase grain. A similar replacement zone may be seen bordering the triangular-
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34. The K-replacement origin of the megacrystal Lower Caribou Creek ...
replacement than in Fig. 6. Total K-replacement, of course, destroys the evidence for the existence of a former plagioclase crystal. The same characteristics are also found in the megacrystal granodiorite in which the microcline crystals are even larger (2-3 cm long) even though the outward field appearance is that of a massive granitic rock ...
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Transient Porosity Resulting from Fluid-Mineral Interaction and its ...
The replacement of one feldspar by another in nature, whether it be plagioclase replaced by K-feldspar or by albite, is frequently associated with the precipitation of hematite, which gives these feldspars a pink color.
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Ice nucleation properties of K-feldspar polymorphs and plagioclase ...
The feldspar minerals can be grouped, according to bulk composition, into potassium-rich feldspar (K-feldspar) and Na- or Ca-rich species (plagioclase). While the series of plagioclase contains all fractions of Na and Ca, there is a mixing gap for K-feldspar. Only a limited fraction of K+ can be replaced by Na+ or Ca2+.
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Laboratory 7: Alkaline rocks - University of British Columbia
- 2 - alkali clinopyroxene: those pleochroic in brown or violet are Acmite or Ti- Augite, and those pleochroic in green are aegerines. Acmite is the Fe3+-Na pyroxene (NaFe3+Si 2 O 6 ), and aegerine is a solid solution between augite (Al-rich Cpx) and acmite.
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Abstract - Memorial University of Newfoundland
Typically, albitized plagioclase phenocrysts occur in an intergranular to intersortal groundmass of albite, chlorite, quartz, dense granular sphene, and variable amounts of subhedral to acicular opaque minerals. Primary clinopyroxene and chromite, and secondary calcite, amphibole and epidote are constituents of some samples.
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Petrography and Mineral Alteration in Berlín Geothermal Field
The hydrothermal minerals occur as replacement minerals on most primary igneous minerals (e.g. replacement of plagioclase by epidote + albite) and as fillings of vesicles/cavities or fractures present in the rock. METHODOLOGY Core samples were studied using microscopic observation of thin sections, with the petrographic
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6. Primary and Secondary Variations in Major and Trace Element ...
Plagioclase is partly replaced by albite, oligoclase, and minor laumontite, prehnite, and anhydrite in irregular patches and veins, and the outer rims of plagio- clase in patches and halos are commonly replaced by secondary anorthite (Laverne et al., this volume).
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Late and postmagmatic alterations in the tin-bearing batholith of ...
existence of replacement phenomena of primary mi- nerals (magmatic) by secondary minerals and the genesis of new minerals in relation to the processes of deuteric alteration: Microclinization. Plagioclase and primary K-feldspar are replaced by microcline that shows the cross-hat- ched twinning (albite and pericline laws) usually well defined.
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Geotechnical logging techniques - QueensMineDesignWiki
Core logging procedure. The following steps are suggested during the core logging process: Clean the core of drilling fluids or mud. Mark major structures, proposed point load testing locations, and depths (every 1-2 metres) on undisturbed core in splits. Photograph the core in the splits (if using triple tube method) with a scale placed in the ...
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Hydrothermal Alteration in the Frankenstein Gabbro Martian Analogue
Composition: Observed quantities of primary and secondary minerals, and element budgets of replacement reactions, indicate influx of Na, K, Fe, Mg, Si from the fluid (Table 1) R K Na Ca Fe Mg Al Si: 2 1 0 4 8 0 2: 0 0 7 0 0 1 0 5. Discussion NASA 1972 • Loss of Ca, influx of Na, K during plagioclase alteration • Calcite, vermiculite formed
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IN THE SOLAR NEBULA II: ALKALI-Ca EXCHANGE REACTIONS AND FORMATION OF ...
normative cryptocrystalline groundmass and plagioclase. These reactions presum ably took place by replacement of Ca of the anorthite component by 2(Na,K) introduced from chondrules, and are called alkali-Ca exchange reactions. The degree of the reaction is variable among chondrules; a few chondrules display the
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Primary - Shop without being sold to
Primary finds forums and Reddit comments while you shop. Add to (it's free) Get honest reviews in 3 easy steps. Add to (it's free) 1. Add the extension. Install the Primary extension on your desktop browser - it's free. 2. Shop for a product.
WhatsApp:+8617329420102How to Size a Transformer? Calculate the Rating of Transformer
Secondary Current = 139.1 Amperes. Now calculate for the rating of transformer according to. P = V x I (Primary voltage x primary current) P = 11000V x 5.25A = 57,750 VA = 57.75kVA. Or P = V x I (Secondary voltages x Secondary Current) P= 415V x 139.1A = 57,726 VA = 57.72kVA.
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2.4 Silicate Minerals - Physical Geology - opentextbc.ca
The three main feldspar minerals are potassium feldspar, (a.k.a. K-feldspar or K-spar) and two types of plagioclase feldspar: albite (sodium only) and anorthite (calcium only). As is the case for iron and magnesium in olivine, there is a continuous range of compositions (solid solution series) between albite and anorthite in plagioclase.
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Introduction & Textures & Structures of Igneous Rocks - Tulane University
Introduction to Igneous Rocks. An igneous rock is any crystalline or glassy rock that forms from cooling of a magma.. A magma consists mostly of liquid rock matter, but may contain crystals of various minerals, and may contain a gas phase that may be dissolved in the liquid or may be present as a separate gas phase.. Magma can cool to form an igneous rock either on the surface of the Earth ...
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Chemical mass balance of calcrete genesis on the Toledo granite (Spain)
A K-feldspar (Fk) is "directly" replaced by calcite (Cc). The different relics of the K-feldspar (dark) have kept their original orientation. Crossed polars. (g) Other exemple of "direct" replacement of a primary mineral (microcline: M) by calcite (0.40 m depth). No displacement is observed all fragments are in optical continuity.
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Plagioclase: The mineral Plagioclase information and pictures
The Plagioclase series is a group of related feldspar minerals that essentially have the same formula but vary in their percentage of sodium and calcium. Albite and Anorthite are the end members of the series, with the intermediary minerals Oligoclase, Andesine, Labradorite, and Bytownite. The acclaimed Dana's System of Mineralogy lists the intermediary members as individual minerals, whereas ...
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Baby Teeth: When They Come In & When They Fall Out - WebMD
6 to 7 years. Other primary tooth eruption facts: A general rule of thumb is that for every 6 months of life, approximately 4 teeth will erupt. generally precede boys in tooth eruption ...
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not be used in support orrhe..restite theoi rb.;;;#A Ih'iIlTl;Hi,t:?fr ...
Secondary actinolitic hornblende is developed as patchy replacement of primary clinopyroxene grains and as thin rims on py- roxene inclusions in plagioclase cores. Fe-Ti oxides. Members of the magnetite-ulvOspinel and ilmenite-hematite solid-solution series are present in both rock tlpes as large grains and as small inclusions in pla-
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Geochemistry, Mineralization and Alteration Zones of Darrehzar Porphyry ...
Propylitic alteration is pervasive and represented mainly by chloritization of primary and secondary biotite and groundmass material in rock peripheral to the central potassic zone. Epidote replaced plagioclase. ... The replacement of plagioclase and amphibole by K-feldspar and biotite, respectively, served to add K and remove Ca and Na ...
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Formation of the First Solids in the Solar System (2011) 9068
Washio1, S. Yuhara1, C. Sasamoto1, K. Takeda1 and S. Yakame1, 1Department of Earth Sciences, Waseda University, 1-6-1 Nishiwaseda Shinjuku, Tokyo, 169-8050 Japan (*[email protected]). Introduction: Primary minerals in Ca-Al-rich in-clusions (CAIs) formed at high temperatures in the solar nebula [1,2]. Secondary minerals in CAIs are
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Genesis of the Giant, Bonanza San Rafael Lode Tin ... - GeoScienceWorld
Early K metasomatism is recorded by widespread replacement of magmatic plagioclase and perthitic alkali feldspar by Na-free orthoclase, while broadly coeval alteration to albite more erratically affected groundmass plagioclase and the rims of alkali feldspar phenocrysts.
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Frontiers | Automated mineralogy (SEM-EDS) approach to sandstone ...
There is little primary porosity (Pp) remaining due to extensive cementation but some secondary porosity (Ps) is present within altered K-feldspar grains. (B) Detrital quartz-dominated Mid Jurassic deltaic sandstones from Halten Terrace, Norway, with minor plagioclase, from a sample at > 4,000 m and approximately 110°C.
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A Contribution to the Genesis of Analcite after Leucite in Potassic ...
replacement of primary leucite either during cooling or shortly afterwards. The absence of hydrous primary igneous minerals such as amphibole or mica, lack of evidence for rapid transport of crystals from the depths indicates the stability of the field for analcite. This indicates that primary crystallization of analcite would
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Soil Chemistry 2-1 THE SOLID PHASE - UC Davis
Si 27.6 Mg 2.1 Al 8.1 Na 2.8 Fe 5.1 K 2.6 In soil minerals, both Si and Al are found as small, highly charged cations (Al3+ and Si4+), which coordinate with the larger O anion (O2-) to form silica tetrahedron and the aluminum octahedron. In both of these structures, the small central ions are surrounded by either four or six O2-or OH-. In ...
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Albite in the propylitic zone of alteration from the Chelopech high ...
served mainly as metasomatic replacement on primary magmatic plagioclase as thin veins, nests or in sepa-rate zones together with quartz and sericite. The min-eral often forms limpid veinlets and aggregates up to 100 µm in thickness, that as a rule preserve the orien-tation of the host plagioclase (Fig. 1).
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A low‐grade metamorphic model for the Miocene volcanic sequences in the ...
plagioclase K-Ar determinations on andesites and rhyolites, Beccar et al. (1986) assigned the VNSS to the upper member of the Miocene Farellones Formation. All these Tertiary volcanic units have been affected by very low grade metamorphism. On the basis of secondary zeolite and mafic phyllosilicate assemblages, Levi et al.
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19. Pedogenic Alteration of Basalts Recovered During Leg 144
Subaerial weathering has been moderate to extreme. Moderate subaerial weathering is expressed by dissolution or replacement of primary minerals (olivine, pyroxenes, plagioclase feldspar) and alteration of glassy or aphanitic matrix to clay minerals, goethite, and hematite. The clay minerals are kaolinite or a brown smectite.
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MYRMEKITE 10 of 50 - California State University, Northridge
Where hydrous fluids were introduced, two replacement processes are suggested to occur simultaneously: (1) the replacement of biotite and hornblende by quartz and (2) the replacement of primary relatively-calcic plagioclase by K-feldspar, secondary sodic plagioclase, and myrmekite.
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Isotopic tracers of the origin of Ca in a carbonate crust from the ...
The secondary product has replaced the pyroxene crystal implying conservation of primary mineral volume. Scheme 3. Schememicrograph of plagioclase replacement (FI by micritic carbonates (C) in the friable saprolite. Note that the replacement begins at the crystal rims but also in the voids of plagioclase.
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Sericitization of plagioclase in the Rosses Granite Complex, Co ...
with the sericitization is alteration of the adjacent primary plagioclase within the cores of grains to a more sodic composition. It is postulated that the sericitization resulted from the action of externally derived secondary hydrothermal fluids, which gained access to the pores in the plagioclase via now sealed microfractures, formed either by
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SE - Granite microporosity changes due to fracturing and alteration ...
The chlorite 1 grains often feature lenticular lamellae and within the former biotite outline there are numerous fine grains of secondary K-feldspar and rutile. The green granite is characterized by complete chloritization of biotite, by minor illitization of the chlorite, by major illitization of plagioclase and by illite infills of fractures.
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Rock-Magnetic Properties of Kondapalle-Pangidi Layered Complex ...
continuous replacement of Ti-magnetites by silicates along the cracks and tend to form a network of veins of silicate minerals with almost replacement (droplet like remains) of Ti-magnetites by silicates at last in stage-5 (Fig. 3e). Besides primary, secondary Ti-magnetites phases are present along the grain
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27.1. PETROGRAPHY OF THE WESTERN ALBORAN BASIN BASEMENT - Deep Sea Drilling
primary mineral. On the other hand, sericitic aggregates are obviously replacement products during secondary altera-tion. Traces of chlorite and magnetite have also been recognized. This rock belongs to a gneiss basement. The secondary alteration may have been related to a later orogenic event. Sample 13-121-24 CC-B2 - Biotite-Plagioclase Gneiss
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