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rapakivi

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Series: Geological Society, London, Special Publications
Published: 21 October 2020
DOI: 10.1144/SP486-2018-5
EISBN: 9781786204868
... Abstract Rapakivi granites were in use during the Middle Ages in Finland. Their most spectacular use, however, was for structures built in St Petersburg between 1760 and 1917. Remarkable examples are the majestic and slender Alexander Column and the 112 columns of St Isaac's Cathedral. All...
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Journal Article
Published: 10 March 2020
Canadian Journal of Earth Sciences (2020) 57 (9): 1011–1029.
... bodies of medium-grained equigranular syenogranite and microgranite porphyry, all locally displaying rapakivi texture. The three rock types have similar U–Pb (zircon) ages of 363 ± 1.6, 364.8 ± 1.6, and 365.5 ± 3.3 Ma, respectively, consistent with field and petrological evidence that they are coeval...
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Journal Article
Published: 01 May 2019
European Journal of Mineralogy (2019) 31 (3): 507–518.
... types of gem-beryl-bearing miarolitic pockets were observed, one in the intermediate zone of the pegmatite close to the contact with the quartz core, and the other at the border of the pegmatite body, at the contact with the host-rock rapakivi granite. Although similar in appearance, the pockets were...
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Journal Article
Published: 01 May 2018
Mineralogical Magazine (2018) 82 (S1): S43–S59.
...C. Broman; K. Sundblad; M. Valkama; A. Villar ABSTRACT Polymetallic quartz veins, with up to 1500 ppm indium, have been discovered recently in the Sarvlaxviken area within the 1.64 Ga anorogenic multiphase Wiborg rapakivi batholith and adjacent 1.90 Ga Svecofennian crust in SE Finland. Evidence...
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Journal Article
Published: 01 May 2016
The Journal of Geology (2016) 124 (3): 313–329.
...Rafael V. Almeida; Yue Cai; Sidney R. Hemming; Nicholas Christie-Blick; Lila S. Neiswanger Abstract Granites crystallize from melts with a range of compositions and textures that provide important clues about the evolution of the continental crust. Rapakivi or A-type granites are usually inferred...
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Journal Article
Journal: Geology
Published: 01 March 2016
Geology (2016) 44 (3): 227–230.
... for Precambrian rocks. We report U-Pb ages (secondary ion mass spectrometry) and trace element (laser ablation–inductively coupled plasma–mass spectrometry) compositions of zircon from three main ferroan granite types of the late Paleoproterozoic Wiborg rapakivi granite batholith of southeastern Finland...
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Journal Article
Published: 17 November 2014
Journal of the Geological Society (2015) 172 (1): 103–112.
... have, however, been shown to display juvenile character, suggesting that variably depleted mantle reservoirs were involved in their genesis. A coupled in situ zircon Hf–O isotope dataset from the 1.64 Ga Ahvenisto AMCG complex in the 1.54–1.65 Ga Fennoscandian rapakivi granite–massif-type anorthosite...
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Journal Article
Journal: Elements
Published: 01 June 2013
Elements (2013) 9 (3): 238.
Journal Article
Published: 01 February 2012
Russ. Geol. Geophys. (2012) 53 (2): 147–168.
...V.B. Savel’eva; E.P. Bazarova Abstract The Primorskii complex in western Cisbaikalia, which formed in the Early Proterozoic at the postcollisional stage in the Siberian craton evolution, comprises rapakivi granites, equigranular biotitic and leucocratic granites, and alaskites. It is a K-rich...
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Journal Article
Journal: Geosphere
Published: 01 December 2011
Geosphere (2011) 7 (6): 1419–1438.
... stricto) to syenite and diorite. The most distinctive characteristic of the Acapulco intrusion is the rapakivi texture developed in the granites, which are characterized by biotite, amphibole, allanite, and fluorite as distinctive minerals, plus titanite, zircon, and apatite as accessory phases...
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Journal Article
Published: 01 December 2011
Russ. Geol. Geophys. (2011) 52 (12): 1563–1573.
... ) and main intrusion phase including quartz monzonites and rapakivi granites (62–73 wt.% SiO 2 ). There are also their dike varieties. Mafic rocks occur in the central part of the massif and compose 3–4% of its area. About 94% of the area are occupied by ovoid quartz monzonites and granites, and 2%, by dikes...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 December 2011
Lithosphere (2011) 3 (6): 409–419.
... be used to infer the presence of a “mildly depleted” sub-Svecofennian mantle evolution curve with ε Hf (1.90) = 4.5 ± 2.5 and 176 Lu/ 177 Hf = 0.0315. Zircons from four out of five rapakivi intrusions (1.53–1.50 Ga) in central Sweden yield negative ε Hf (t) in the range −9.8 to −4.6, suggesting mixed...
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Journal Article
Published: 01 August 2010
The Canadian Mineralogist (2010) 48 (4): 947–968.
... to hornblende, except in Klewno and Gołdap, where it is absent. Apatite, titanite, zircon, magnetite and ilmenite are the main accessory phases. Quartz is present in the most evolved rocks, and myrmekite and biotite–quartz symplectites are common. Rapakivi textures were locally observed in a small number...
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Journal Article
Published: 01 August 2010
The Canadian Mineralogist (2010) 48 (4): 969–990.
...Aku P. Heinonen; O. Tapani Rämö; Irmeli Mänttäri; Bo Johanson; Reijo Alviola Abstract The ~1640 Ma Ahvenisto AMCG complex in southeastern Finland is the most prominent occurrence of massif-type anorthosite and associated monzodioritic rocks in the Fennoscandian rapakivi suite. The petrology...
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Journal Article
Journal: GSA Bulletin
Published: 01 January 2010
GSA Bulletin (2010) 122 (1-2): 253–264.
... postkinematic circular to ovoid plutons are the most abundant of this compositional group, and many show rapakivi textures. A second, more felsic group has much higher light (L) to heavy (H) rare earth element (REE) ratios. The third group is highly fractionated, contains topaz locally, is enriched in Rb, Nb...
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Journal Article
Published: 01 December 2009
The Canadian Mineralogist (2009) 47 (6): 1359–1374.
... résulterait de la migration d’un magma résiduel fortement évolué provenant des parties plus profondes de la chambre magmatique vers la carapace de cette chambre. Cette migration pourrait être liée à une ouverture du contact entre l’encaissant, un granite rapakivi, et le granite porphyritique...
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Journal Article
Published: 01 December 2009
The Canadian Mineralogist (2009) 47 (6): 1469–1492.
...Lêda Maria Barreto Fraga; Roberto Dall’Agnol; João Batista Sena Costa; Moacir José Buenano Macambira Abstract Le complexe mésoprotérozoïque à anorthosite – mangerite – rapakivi granite (AMG) de Mucajaí, situé dans le nord du Brésil, contient des granites à texture rapakivi, des...
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Journal Article
Published: 01 December 2009
The Canadian Mineralogist (2009) 47 (6): 1505–1526.
...-orogéniques; elle s’étale sur une longueur d’environ 350 km le long de la bordure sud du socle Apiaí–Guaxupé, dans le sud-est du Brésil. Les composants typiques sont des granites subalcalins de type A, certains ayant une texture rapakivi, qui ont cristallisé à des conditions variables, mais surtout...
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Journal Article
Published: 01 December 2008
The Canadian Mineralogist (2008) 46 (6): 1417–1442.
...Axel Müller; Reimar Seltmann; Bernd Kober; Olav Eklund; Teresa Jeffries; Andreas Kronz Abstract The compositional zoning of plagioclase-mantled K-feldspar, defining the rapakivi texture, and of the associated quartz phenocrysts from the Paleozoic Land’s End (U.K.) and Altenberg–Frauenstein...
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Journal Article
Published: 01 September 2007
Geological Magazine (2007) 144 (5): 837–848.
... dating yielded a plateau age of 219 ± 2 Ma, identical to the ages of rapakivi-textured granitoids in the area. The association of lamprophyre dykes and rapakivi-textured granitoids indicates that the Qinling region was a post-collisional setting at c. 220 Ma. The Qinling lamprophyres are calc-alkaline...
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