Results 191 to 200 of about 3,709 (226)

Petrology and geochemistry of Late Triassic rapakivi-type granites in the Dupangling area, South China: Role of fluid-rock interaction in the origin of rapakivi texture

Lithos, 2023
Qian-Qian Zhao, Chong‐Jin Pang, Shu-Nv Wen, Xuan-Ce Wang, Xiao-Long Huang, Bryan Krapež, Xian-Sheng Luo, Ling-An Bai, Yu Dai   +8 more
semanticscholar   +1 more source

Granitoids of rapakivi granite-anorthosite and related associations

Precambrian Research, 1991
Abstract 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
openaire   +1 more source

Petrogenesis of the Proterozoic rapakivi granites of Finland

1990
The rapakivi granites (1.7 to 1.55 Ga) of southern Finland occur as epizonal batholiths (e.g., the Wiborg, Åland or Ahvenanmaa, Vehmaa, and Laitila batholiths) and stocks cutting the medium- to high-grade metamorphic Svecofennian (1.9 to 1.8 Ga) crust.
Ilmari Haapala, O. Tapani Rämö
openaire   +1 more source

Rapakivi texture from the O’Leary Porphyry, Arizona (U.S.A.)

Bulletin Volcanologique, 1980
The rhyodactic O’Leary Porphyry which forms the Pleistocene (0.233±0.37 m.y.) volcanic domes of O’Leary Peak and Darton Dome in the San Francisco Volcanic Field (northern Arizona, U.S.A.) contains sanidine phenocrysts with oligoclase mantles (rapakivi texture).
openaire   +1 more source

Rapakivi Granites of the Kodar Complex (Aldan Shield): Age, Sources, and Tectonic Setting

Petrology, 2021
A. M. Larin, A. Kotov, V. Kovach, E. Sal’nikova, D. Gladkochub, V. Savatenkov, S. D. Velikoslavinskii, T. M. Skovitina, N. Rizvanova, N. Sergeeva, V. Vodovozov   +10 more
semanticscholar   +1 more source

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
openaire   +1 more source

The origin of rapakivi texture by sub-isothermal decompression

Precambrian Research, 1999
Abstract The rapakivi texture (plagioclase-mantled K-feldspar ovoids, rounded quartz megacrysts and euhedral plagioclase megacrysts in a more fine-grained granitic matrix) has been studied in five Proterozoic (1.64–1.55 Ga) anorogenic rapakivi granite batholiths in the Fennoscandian Shield with emphasis on mineral stability and inherited cores.
openaire   +1 more source

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-
openaire   +1 more source

Rapakivi • Oddballs

2022
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rapakivi, n.

2023
openaire   +1 more source