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Thursday, May 14, 2020 | History

2 edition of Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland found in the catalog.

Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland

Atso Ilmari Vorma

Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland

by Atso Ilmari Vorma

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  • 2 Currently reading

Published by Geologinen tutkimuslaitos in Otaniemi [Finland] .
Written in English

    Places:
  • Finland.
    • Subjects:
    • Feldspar -- Finland.

    • Edition Notes

      Bibliography: p. 70-72.

      Statementby Atso Vorma.
      SeriesBulletin de la Commission géologique de Finlande ;, n:o 246
      Classifications
      LC ClassificationsQE276.3 .A6 no. 246, QE391.F3 .A6 no. 246
      The Physical Object
      Pagination72 p.
      Number of Pages72
      ID Numbers
      Open LibraryOL4861381M
      LC Control Number75884597

      1 GEOLOGIAN TUTKIMUSKESKUS AIOTKO JULKAISTA? GTK:n tutkimustoiminnan keskeisenä tavoitteena on tulosten kattava julkaiseminen. Merkittävät tutkimustulokset on aina pyrittävä julkaisemaan korkeatasoisissa, vertaisarvioiduissa sarjoissa. Alkali feldspar, any of several common silicate minerals that often occur as variously coloured, glassy crystals. They are used in the manufacture of glass and ceramics; transparent, highly coloured, or iridescent varieties are sometimes used as gemstones. The alkali feldspars are primarily.

      Rapakivigraniitit - Suomen Geologinen Seura. 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 .

      Principles of Igneous and Metamorphic Petrology - by Anthony Philpotts January Rapakivi and alkali feldspar phenocrysts from the Deer Isle Granite Complex were investigated using in situ trace element and Pb isotope geochemistry to see if magma mixing or isothermal decompression was responsible for their formation. Pb isotope and trace element profiles, along with CL imagery of quartz phenocrysts, indicate compositional changes in the magma chamber occurred during Cited by: 1.


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Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland by Atso Ilmari Vorma Download PDF EPUB FB2

Get this from a library. Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland. [Atso Ilmari Vorma]. Metasomatic alkali-feldspar syenites (episyenites) of the Proterozoic Suomenniemi rapakivi granite complex, southeastern Finland Article in Lithos September with 56 Reads.

Peralkaline to marginally metaluminous alkali-feldspar syenites and quartz alkali-feldspar syenites are hosted by subalkaline, ferroan rapakivi granites in the Ma Suomenniemi complex of southeastern Finland. These alkali syenites form NW-oriented dikes and small (granites by their color (violet-red), general lack of quartz, as well Cited by: 4.

The studied rock samples belong to the classic – Ma Wiborg Rapakivi granite terrane of southeastern Finland.

Geochemical studies show that the rapakivi granites and associated rocks form metaluminous to peraluminous A-type granites and plot in the "within plate granites (WPG)" field on the tectonic discriminate diagrams from the Onkamaa, Suomenniemi and Luumäki.

Vorma A () Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland. Bull Comm Geol Finland –72 Google Scholar Wark DA, Stimac JA () Experimental evidence for the origin of rapakivi texture by a dissolution- and diffusion-controled mechanism.

In: Haapala I, Ramo OT Cited by: 4. Vorma A. Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland. Bull. com. geol. Finl.72 S.

Vorma A. On the contact aureole of the Wiborg rapakivi massif in southeastern Finland. Geological survey of Finland, Bull. 28 S. Wahl W. Die Gesteine des Wiborger Rapakiwigebietes. Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland Volyymi:Julkaisusarja: Geological Survey of Finland, Bulletin - Bulletin de la Commission Géologique de Finlande, Hinta: 5€.

Download Citation | Crystallization conditions of the Wiborg rapakivi batholith, SE Finland: An evaluation of amphibole and biotite mineral chemistry | The wiborgite and dark wiborgite rapakivi. Alkali feldspar granite, some varieties of which are called 'red granite', is a felsic igneous rock and a type of granite rich in the mineral potassium feldspar (K-spar).

It is a dense rock with a phaneritic texture. The abundance of K-spar gives the rock a predominant pink to reddish hue; peppered with minor amounts of Primary: Potassium feldspar, quartz.

Geological Survey of Finland. Bulletin64 s. Vorma, Atso Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland. Bulletin de la Commission geologique de Finlande N:o72 s. 28 Vorma, Atso On the contact aureole of the Wiborg rapakivi granite massif in southeastern Finland.

Geological Survey of Finland. Vorma A. Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland. Bull. com. geol.

Finl.72 S. Vorma A. On the contact aureole of the Wiborg rapakivi massif in southeastern Finland. Geological survey of Finland, Bull.

28 S. Vorma, A. Alkali feldspars of the Wiborg rapakivi massif in southeastern Finland. Bull. Comm. Geol.

Finlande No Matti Vaasjoki and Tapani Rämö, Excursion A2: The Wiborg rapakivi batholith and associated rocks in the south-eastern Finland. Heinonen, A. fl.: Guide to the IGCP (A-type granites and related rocks through time).

Heininen, Aku: Introduction to the Rapakivi granites and associated rocks of southeastern Finland. Laitakari I. et al, Subjotnian: Rapakivi granites and related rocks in the surroundings of the Gulf of Finland.

Geol. Survey of Finland. Special pa Vorma, A. Alkali feldspars of the Wiborg rapakivi massif in southeastern. Alkali f eldspars of the Wiborg rapakivi massif in southeastern Finland / A. Vorma (Bulletin de la Commissions Geologique de Finlande No. ) Otaneimi: Geologinen tutkimuslaitos, Sale Price: £ 4.

Alkaline rocks and carbonatites of the World Part 2: former USSR / L.N. Kogarko et al. London: Chapman & Hall, 3. Alkali f eldspars of the Wiborg rapakivi massif in southeastern Finland / A. Vorma (Bulletin de la Commissions Geologique de Finlande No.

) Otaneimi: Geologinen tutkimuslaitos, Sale Price: £ 4. Amphiboles and other hydrous pyriboles – mineralogy. The type locality of the Proterozoic rapakivi granites, the Wiborg batholith of southeastern Finland and adjacent far west Russia, comprises a versatile series of granitic plutonic rocks.

These granites are A-type (cf. Bonin, ; Dall’Agnol et al., ) and they are associated with coeval leucogabbroic (leucogabbronoritic) rocks of the.

GEOLOGICAL SURVEY OF FINLAND Bulletin Natural stone exploration in the classic Wiborg rapakivi granite batholith of southeastern Finland – new insights from integration of lithological, geophysical and structural data by Paavo Härmä ACADEMIC DISSERTATION Department of Geosciences and Geography, University of Helsinki.

Barium feldspars are also considered alkali feldspars. Barium feldspars form as the result of the substitution of barium for potassium in the mineral structure. The barium feldspars are monoclinic and include the following: celsian BaAl 2 Si 2 O 8, hyalophane (K,Ba)(Al,Si) 4 O 8.

Plagioclase feldspars. The plagioclase feldspars are ry: Tectosilicate. The classic Wiborg batholith of southeastern Finland and adjacent Russia is flanked in the north by two smaller rapakivi granite complexes, Suomenniemi and Ahvenisto [Fig.

1(a)]. Both of these provide good examples of the bimodal (silicic–basic) character of rapakivi granite by: Rapakivi granite is a hornblende-biotite granite containing large round crystals of orthoclase each with a rim of oligoclase (a variety of plagioclase).The name has come to be used most frequently as a textural term where it implies plagioclase rims around orthoclase in plutonic rocks.

Rapakivi is Finnish for "crumbly rock", because the different heat expansion coefficients of the component. Savitaipaleen kartta-alueen kalliopera -   Abstract. A micro-drilling technique was used to detect and study the effect of entrainment of antecrystic zircon in rapakivi texture-forming megacrystic alkali feldspar ovoids in the ferroan granites of the Paleoproterozoic (c.

Ma) Wiborg batholith of southeastern ally controlled analysis of major granite types (wiborgite, dark wiborgite, pyterlite, and porphyritic granite Cited by: 5. The dyke-like Ga Jaala-Iitti rapakivi complex forms a 25 km long and up to 2 km wide intrusive body at the northwestern margin of the Wiborg rapakivi batholith cutting both the granites of the batholith and the surrounding Ga Svecofennian crust.

The subvolcanic-epizonal Jaala-Iitti complex consists of silicic (quartz-feldspar porphyry) and basic (diabase) rocks as well as more Cited by: