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Rapakivi Granite of Ezhimala Complex and its Significance
Journal Geological Society of India, 1982Abstract The field characters, chemistry and the spatial association of the 678 m.y. old Rapakivi granite with gabbros and anorthosites suggest that these litho-units have developed through bimodal magmatic processes whereby heat derived from basic magma parental to the anorthositic rocks caused partial melting at or near the base of the
M. M. Nair, K. T. Vidyadharan
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Reduced rapakivi-type granites: The tholeiite connection
Geology, 1997Reduced 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, B. Ronald Frost
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Rapakivi texture: An indication of the crystallization of hydrosilicates, II
Earth-Science Reviews, 1985Rapakivi granites have puzzled all who have seriously studied them. Typical rapakivi texture is a mixture of variously mantled, non-mantled or partly mantled, concentrically zoned, plastically distorted, fragmented, reaggregated, large and small ovoids.
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Geology, Petrography and Petrology ofthe Rapakivi Granites; The Rapakivi Granites of Finland
İri alkali feldispatm plajiyoklas tarafından çevrelenmesiyle oluşan dokuyu gösteren granitler "Rapakivi Granitleri" olarak adlandırılmaktadır. Çoğunlukla Proterozoyik 1.8-1.0 milyar yıl yaşlı olan rapakivi granitleri, Ukrayna, Baltık ülkeleri, güney Grönland, orta-kıtasal ve batı ABD, Venezüella, Brezilya, Bostwana ve diğer birçok ...ARSLAN, Mehmet, ASLAN, Zafer
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Granitoids of rapakivi granite-anorthosite and related associations
Precambrian Research, 1991Abstract Mid-Proterozoic anorthosite-mangerite-charnockite-rapakivi granite (AMCG) magmatic suites have commonly intruded Proterozoic orogenic belts within 100 Ma or less to as much as 600 Ma after cessation of calc-alkalic crustal generation processes. High FeO (FeO+MgO) , high Na2O+K2O, low Al2O3, and reduced redox condition of the granitoids
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Study supporting restoration of rapakivi granite in St. Petersburg
Resources Policy, 2022Tuomas Sihvonen +2 more
exaly