Results 121 to 130 of about 2,559 (173)

Granitoides of the State of Bahia, Brazil [PDF]

, 1987
Conceicao, H., Davison, I., Fujimori, S., McReath, I., Sabaté, Pierre   +4 more
core  

Migmatite and Rapakivi Granite in the South Finland

Journal of Geography (Chigaku Zasshi), 2006
openaire   +2 more sources

Rapakivi-related In-rich mineralisations in southeastern Fennoscandia

, 2019
openaire   +2 more sources

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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
exaly   +2 more sources

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
exaly   +2 more sources

Rapakivi granites from Brazil and adjacent areas

Precambrian Research, 1999
Abstract A review of the rapakivi magmatism in Brazil and adjacent areas demonstrates that the dominantly felsic anorogenic complexes of the Amazonian craton can be considered as rapakivi suites. They are found in almost all provinces of the craton and are concentrated in the timespan covering the end of the Palaeoproterozoic until the beginning of ...
exaly   +2 more sources

Rapakivi granites and related rocks: an introduction

Precambrian Research, 1999
Abstract This article is an introductory chapter for the proceedings of the last, seventh, meeting of the International Geological Correlation Programme (IGCP) Project 315 “Correlation of Rapakivi Granites and Related Rocks on a Global Scale”, 1991–1996.
exaly   +2 more sources

Reduced rapakivi-type granites: The tholeiite connection

Geology, 1997
Reduced rapakivi-type granites are the most iron enriched and reduced (i.e., least oxidized) of the “anorogenic” granite association. The low oxygen fugacity and chemical composition of these granites severely limit their sources. In this paper we argue that reduced rapakivi-type granites and their eruptive equivalents, high-potassium fayalite ...
Carol D Frost
exaly   +2 more sources

Rapakivi granites in the geological history of the earth. Part 1, magmatic associations with rapakivi granites: Age, geochemistry, and tectonic setting

Stratigraphy and Geological Correlation, 2009
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, gabbro-rapakivi granite-
exaly   +2 more sources

Rapakivi granite problems: plagioclase mantles and ovoid megacrysts

Australian Journal of Earth Sciences, 2016
ABSTRACTMantling of alkali feldspar megacrysts by oligoclase (‘rapakivi texture’) generally can be interpreted as the result of magma mixing, although decompression is a viable interpretation, especially for high-level intrusions. Coexistence of mantled and unmantled crystals can be explained by transfer of mantled crystals (‘antecrysts’) from a mixed (
exaly   +2 more sources