Rapakivi granite - Wikipedia
WebRapakivi 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 …
Rapakivi granites and related rocks: an introduction
WebApr 30, 1999 · The current definition of rapakivi granite ( Haapala and Rämö, 1992) does not restrict the age of the rocks and simply considers them “A-type granites characterized by the presence, at least in the larger batholiths, of …
Rapakivi granites - Müller - 2007 - Wiley Online Library
WebJun 25, 2007 · Rapakivi granites, especially the famous rapakivis from southern Finland, are some of the most attractive building and decorative stones, used world-wide because of their striking textures and beau...
One hundred years of rapakivi granite | Mineralogy and …
WebMar 17, 2017 · Summary. Rapakivi granites, recently redefined as A-type granites showing rapakivi texture at least in the larger batholiths, occur on all continents and presumably represent the most voluminous continental silicic intraplate magmatism on Earth.
Petrology and geochemistry of Late Triassic rapakivi-type granites …
WebDec 1, 2023 · Abstract. Rapakivi-type granites not only document magmatic processes but also archive subsolidus interactions between granitic rock and fluid, and thereby provide crucial information about fluid infiltration in the Earth's crust. However, the key process to generate rapakivi texture is still debated.
Rapakivi texture | SpringerLink
WebTuttle and Bowen (1958), and Stewart and Roseboom (1962) consider experimental results and explain rapakivi texture as a special case of near eutectic, low-temperature recrystallization and reequilibrium in the three-phase albite–anorthite–orthoclase region of the granite system.
Rapakivi - Sandatlas
WebRapakivi is a type of granite. Its type locality is the Vyborg batholith which is located in SE Finland and Karelia, Russia. “Rapakivi” is a term that comes from the Finnish language (rotten or crumbled stone) but this rock type is not restricted to this particular area. The magmatic plutons showing rapakivi texture are found in many places ...
Rapakivi | igneous rock | Britannica
WebContents. rapakivi. igneous rock. Learn about this topic in these articles: occurrence in Svecofennian Orogen. In Precambrian: Orogenic belts. …by tin-bearing crustal-melt granites, called rapakivi granites after their coarse, zoned feldspar megacrysts (that is, crystals that are significantly larger than the surrounding fine-grained matrix).
Chapter 12 Rapakivi Granites - ScienceDirect
WebJan 1, 2005 · The rapakivi texture (characterized by ovoidal plagioclase-mantled alkali feldspar megacrysts) is considered magmatic in origin and may relate to abrupt decrease of pressure during the emplacement of the intrusions and to hybridization processes.
Rapakivi granites in the geological history of the earth. Part 1 ...
WebJun 9, 2009 · Abstract. Rapakivi granites characteristic practically of all old platforms are greatly variable in age and irregularly distributed over the globe. Four types of magmatic associations, which include rapakivi granites, are represented by anorthosite-mangerite-charnockite-rapakivi granite, anorthosite-mangerite-rapakivi-peralkaline granite ...
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