Results 121 to 130 of about 2,536 (164)

Granitoides of the State of Bahia, Brazil [PDF]

open access: yes, 1987
Conceicao, H.   +4 more
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Migmatite and Rapakivi Granite in the South Finland

open access: yesJournal of Geography (Chigaku Zasshi), 2006
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Rapakivi Texture in Rhyolite

Nature, 1969
RAPAKIVI texture has rarely been reported in volcanic rocks1. A notable example of a volcanic body with rapakivi texture is a Miocene rhyolite2 that has an exposure area of about 1/16 square mile near California State Highway 178 on the east flank of Rhodes Hill 1/4 mile west of the eastern boundary of Death Valley National Monument.
A. L. EHRREICH, R. E. WINCHELL
openaire   +1 more source

Bacterial weathering of rapakivi granite

Geomicrobiology Journal, 1981
Rapakivi granite samples were incubated with Pseudomonas aeruginosa culture solutions in order to elucidate the possible role of bacteria in rapakivi (crumbling stone) disintegration. SEM micrographs showed micromorphological alterations on the incubated rapakivi surface at 21 to 23°C for 20 days.
Antti Vuorinen   +3 more
openaire   +1 more source

The Origin of Rapakivi Texture

Journal of Petrology, 1994
45124
Dempster, TJ, Jenkin, GRT, Rogers, G
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Rapakivi granite, anorthosite and charnockitic plutonism

Nature, 1978
THE close association of massive anorthosite and charnockitic granitic rocks is well documented1. Rare earth element (REE) investigations2–4 have indicated that the massive charnockite (mangerite) associated with anorthosite is not comagmatic with it but represents a distinct magma fraction.
F. H. HUBBARD, J. E. WHITLEY
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One hundred years of rapakivi granite

Mineralogy and Petrology, 1995
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. Most of the rapakivi granites are Proterozoic (mainly 1.0 to 1.7 Ga) but also Archean (2.8 Ga) and Phanerozoic (0.05 ...
O. T. R�m�, I. Haapala
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Biotite from rapakivi

Mineralogy and Petrology, 1994
This paper deals with the chemical composition of biotites from rapakivi granites. For this purpose, 61 chemical analyses of biotites from composite anorthosite-rapakivi plutons in the Fennoscandian and Ukranian shields were used. Figurative points of the biotite composition were plotted on diagrams designed for biotites byFoster (1960),Winchell (1949)
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