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Australian Journal of Earth Sciences Can the size of K ...

Can the size of K-feldspar phenocrysts be used to map the occurrence of mylonitic shear zones? Results from the Wyangala Granite, Eastern Lachlan Fold Belt, New

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Can the size of K-feldspar phenocrysts be used to

2015-9-27  The aim of this study was to determine if the size of K-feldspar phenocrysts could be used to map variations in strain intensity in the Wyangala Granite and map the location of

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Formation of K-feldspar megacrysts in granodioritic ...

2009-10-15  absence of K-feldspar phenocrysts or megacrysts, are first- ... lockup, they can be used to track dynamic features such as magma flow, crystal avalanching, and crystal sorting and ... Granodiorite in the east and the tonalite of Glen Aulin and equivalent rocks in the west, all of which are relatively

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Phenocryst Revolvy

Phenocryst A phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock. Such rocks that have a distinct difference in the size of the crystals are called porphyries, and the adjective porphyritic is used to describe them. Phenocrysts often have euhedral forms, either due to early growth within a ...

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Exsolution and alteration microtextures in alkali feldspar ...

2018-2-8  The Shap granite alkali feldspar phenocrysts have been investigated using light microscopy, SEM, ... This technique allows K to be distinguished from Na feldspar by differences in their etching rates. ... Na feldspar, up to 3 ~tm in size, along some or all of

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Phenocryst - Wikipedia

2018-9-29  A phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock. Such rocks that have a distinct difference in the size of the crystals are called porphyries, and the adjective porphyritic is used to describe them. Phenocrysts often have euhedral ...

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K-feldspar megacrysts in granites — Phenocrysts, not ...

K-feldspar megacrysts in granitoid plutons have been interpreted as either phenocrysts or porphyroblasts. Most of the microstructural, mineralogical and chemical evidence (e.g., shape, alignment, concentration, Ba content, zoning, inclusions, and twinning) favours a phenocryst origin.

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The origin of K-feldspar megacrysts hosted in alkaline ...

In situ Sr-isotope and microchemical studies were used to determine the provenance of K-feldspar megacrysts hosted in mafic alkaline potassic, ultrapotassic rocks and in differentiated rocks from two nearby volcanic apparatus in central Italy.

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Hand specimen descriptions of igneous rocks - Union

2017-5-8  Hand specimen descriptions of igneous rocks Basically, hand specimen descriptions should tell someone looking at a rock everything ... Pink K-feldspar phenocrysts are up to 2.5 cm long in a medium-grained matrix of pink K-feldspar, quartz, white plagioclase, biotite, and muscovite. ... the term K-feldspar is used in place of a more specific ...

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Textures of igneous rocks SpringerLink

2018-9-22  45.glass; where the crystals are markedly different in size, the term hiatal can be used. Porphyrogranulitic —refers to an ophitic texture characterized by large phenocrysts of feldspar and augite and/or olivine in a groundmass of lath-shaped feldspar crystals and irregular augite grains; a combination of prophyritic and intergranular texture.

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Can the size of K-feldspar phenocrysts be used to

Title: Can the size of K-feldspar phenocrysts be used to map the occurrence of mylonitic shear zones? Results from the Wyangala Granite, Eastern Lachlan Fold Belt, New South Wales

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K-feldspar megacrysts in granites — Phenocrysts, not ...

K-feldspar megacrysts in granitoid plutons have been interpreted as either phenocrysts or porphyroblasts. Most of the microstructural, mineralogical and chemical evidence (e.g., shape, alignment, concentration, Ba content, zoning, inclusions, and twinning) favours a phenocryst origin.

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Hand specimen descriptions of igneous rocks - Union

2017-5-8  Pink K-feldspar phenocrysts are up to 2.5 cm long in a medium-grained matrix of pink K-feldspar, quartz, white plagioclase, biotite, and muscovite. The point of hand sample descriptions is to give enough information so someone at a complex

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Origin of K-feldspar megacrysts in granitic rocks ...

2007-8-28  Conflicting theories for the origin of K-feldspar megacrysts in granitic rocks are prin-cipally (l) the megacrysts crystallized from a melt or (2) they grew by replacement from a ... arl phenocrysts crystallized directly from a melt as a pri- megacrysts in the country rock may have grown from a ... in K-feldspar megacrysts including Dickson and ...

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Feldspar - Wikipedia

2018-10-4  Feldspar is a common raw material used in glassmaking, ceramics, and to some extent as a filler and extender in paint, plastics, and rubber. In glassmaking, alumina from feldspar improves product hardness, durability, and resistance to chemical corrosion.

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K-feldspar phenocrysts in microgranular magmatic

Nine K-feldspar phenocrysts from five enclaves and one from equigranular granite (reference crystal) were cut so that the section used crossed the core of each crystal. Barium distribution was mapped to document the major zoning features.

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Textures of igneous rocks SpringerLink

2018-9-22  45.glass; where the crystals are markedly different in size, the term hiatal can be used. Porphyrogranulitic —refers to an ophitic texture characterized by large phenocrysts of feldspar and augite and/or olivine in a groundmass of lath-shaped feldspar crystals and irregular augite grains; a combination of prophyritic and intergranular texture.

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Wisconsin Geological Natural History Survey »

Pink K feldspar crystal with quartz. Wimmer Pit, near Wausau, Marathon County, WI. ... Otherwise the more generic term “K spar” is used. K spar is abundant in many geologic settings in Wisconsin. It is a major component of granitic and syenitic rocks in the central and northeastern portion of the state. ... K spar can also be found as tiny ...

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Phenocryst Revolvy

A phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock. Such rocks that have a distinct difference in the size of the crystals are called porphyries, and the adjective porphyritic is used to describe them. Phenocrysts often have euhedral forms, either due to early growth within a magma, or ...

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Textures of igneous rocks SpringerLink

2018-9-22  45.glass; where the crystals are markedly different in size, the term hiatal can be used. Porphyrogranulitic —refers to an ophitic texture characterized by large phenocrysts of feldspar and augite and/or olivine in a groundmass of lath-shaped feldspar crystals and irregular augite grains; a combination of prophyritic and intergranular texture.

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Granite tectonics’’ revisited: insights from comparison of ...

2017-8-26  magmatic fabrics can record different processes in a single pluton (Paterson et al. 1998;Zˇa´k et al. 2005), or there can ... used to compare quantitatively the shape preferred orien- ... with K-feldspar phenocrysts up to 10 cm in size and common mafic schlieren (Zˇa´k and Klomı´nsky´ 2007).

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Potassium-Feldspar Phenocrysts in the Surface of

exterior can very easily be overlooked, since they often are rust colored. ... Potassium-Feldspar Phenocrysts in the Surface of Colomera, and Iron Meteorite Abstract. ... sociated with the K-feldspar; none was observed in the globular-type inclusion. The carbonate mineralization is re-

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CORE

Can the size of K-feldspar phenocrysts be used to map the occurrence of mylonitic shear zones?:Results from the Wyangala Granite, Eastern Lachlan Fold Belt, New South Wales

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MONOCLINIC K-FELDSPAR JULIAN GOLDSMITH

Many of the altered phenocrysts of K-feldspar in the Lincoln Porphyry near Leadville, Colorado, show small but real extemal deviations from monoclinic geometry. All of the evidence indicates that distortion of normal monoclinic feldspar rather than

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Zircon U-Pb ages and Hf isotopic characteristics of the ...

2017-8-27  K-feldspar phenocryst, gneissic layerings, porphyry-like (blastoporphyritic) texture, and the K-feldspar phenocryst with texture of rotation and eye-shape in a handy specimen; b. tartan twinnings of the microcline and polysynthetic twinnings of the plagioclase (under perpendicular polar-

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Highly retentive core domains in K-feldspar and their ...

2016-2-26  and frequency factor used in simulations. Many pub- ... could be analysed separately to K-feldspar derived from crushed phenocrysts. The two K-feldspar aliquots were ... the groundmass, whereas the data from the phenocrysts can be taken to asymptotically rise to a poorly defined

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Lee Lennox University of Oxford - Academia.edu

The aim of this study was to determine if the size of K-feldspar phenocrysts could be used to map variations in strain intensity in the Wyangala Granite and map the

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Original paper Compositional trends in magmatic and ...

2014-1-3  The K-feldspar phenocrysts in the granodiorite and granodiorite porphyry exhibit complex magmatic crystallization ... gangue and ore minerals can be found in Zachariáš et al. (2001). Quartz veins are usually devoid of visible ... phenocrysts of K-feldspar (0.5–1.5 cm in size) commonly enclose numerous irregularly distributed inclusions of ...

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Geochemical Characterization, Geochronology, and ...

2018-6-6  This rock is composed of K-feldspar phenocrysts, deformed quartz, and garnet. Quartz-bearing syenite is porphyritic, medium-grained and is composed of K-feldspar phenocrysts 1–1.5 cm long, quartz, orthopyroxene, clinopyroxene, hornblende, biotite and

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Geochemical Characterization, Geochronology, and ...

2018-6-6  This rock is composed of K-feldspar phenocrysts, deformed quartz, and garnet. Quartz-bearing syenite is porphyritic, medium-grained and is composed of K-feldspar phenocrysts 1–1.5 cm long, quartz, orthopyroxene, clinopyroxene, hornblende, biotite and

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Igneous Rocks - University of Houston

Phenocrysts are typically plagioclase although olivine, pyroxene and amphibole can also occur as large crystals. ... Silica content can be used to classify igneous rocks. Most igneous rocks fall within the range of 40 to 70 % SiO2 by weight. ... Felsic Minerals: Light-colored minerals consisting of quartz, K-feldspar, plagioclase and muscovite ...

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Feldspar - sandatlas.org

Feldspar is the most abundant mineral group in the Earth’s crust.There are more feldspars (60%) than all the other minerals combined in the outer (13-17) km of the crust 1.Feldspars occur in most igneous and metamorphic rocks.

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Geophysical Mapping, Geochemical Evidence and

2014-4-21  curacy and resolution of these techniques so that they can be used to provide useful enhanced information on li-thology and geological structures [4]. ... The quartz phenocrysts are euhedral to anhedral, ranging in size from 1 to 3 mm in diameter. It contains ... length included in quartz and K-feldspar phenocrysts, or large (0.2 - 1 mm ...

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feldspar Properties, Uses, Types, Facts

Feldspar: Feldspar, any of a group of aluminosilicate minerals that contain calcium, sodium, or potassium. Feldspars make up more than half of Earth’s crust, and professional literature about them constitutes a large percentage of the literature of mineralogy. Learn more about the properties and uses of feldspar in this article.

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Noncoaxial K‐feldspar and AMS subfabrics in the

[30] A comparison of the K‐feldspar fabric with the biotite fabric should be made at the locality scale, because specimens for measuring K‐feldspars and the AMS are different in size (cf. 1000 cm 3 versus 10 cm 3, respectively) and contain different numbers of grains (up to several tens of K‐feldspar grains and about 1000 biotite grains).

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Geochemistry and correlation of volcanic ash beds from

2011-11-30  quartz, chlorite and minor K-feldspar. Magmatic sanidine phenocrysts (K,Na,Ca)AlSi3O8 ... Samples of sufficient size, at least 8 g, were analysed ... Geochemistry and correlation of volcanic ash beds 209 The lower boundary of the Rootsiküla Stage is quite

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CLAY MINERALS IN HYDROTHERMALLY ALTERED ROCKS

2009-3-23  K-feldspar but not albite is deposited on ... Because of the relatively small size of plagioclase phenocrysts, no attempt has been made to separate the clay formed by alteration of plagioclase from ... CLAY MINERALS IN HYDROTHERMALLY ALTERED ROCKS (%) (%) (%) -- clays. Clays and Clay Minerals ...

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Understanding magmatic processes at Telica volcano ...

2017-6-7  Understanding magmatic processes at Telica volcano, Nicaragua: crystal size distribution and textural analysis . Molly Witter . ABSTRACT . Crystal size distribution (CSD) profiles of plagioclase feldspar phenocrysts were determined from basalts and basaltic-andesites of Telica volcano, Nicaragua. ...

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