Results 1 to 10 of about 759 (173)
Boulder of orbicular rapakivi in Taivassalo, southwestern Finland [PDF]
Bulletin of the Geological Society of Finland, 1983 A boulder of an orbicular rapakivi was found in Taivassalo, close to the southern contact of the Vehmaa rapakivi area in southwestern Finland. Many features, e.g.
N. Edelman
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A specialized topaz-bearing rapakivi granite and associated mineralized greisen in the Ahvenisto complex, SE Finland [PDF]
Bulletin of the Geological Society of Finland, 1991 The Ahvenisto rapakivi complex is a satellite northwest of the large Wiborg rapakivi batholith in Southeastern Finland. The rapakivi rocks are surrounded by rapakivi-age gabbros, anorthosites, monzodiorites and diabases.
P. Edén
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Weathering in the Wyborg rapakivi area, southeastern Finland [PDF]
Fennia: International Journal of Geography, 1985 Field survey of weathering sites in the Wyborg rapakivi area indicates that saprolites are far more common in the central part of the massif than in the marginal areas. Many till‑covered saprolites and parautochthonous crust‑tills prove the weathering to
Aimo Kejonen
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Sediment Characteristics in Stonewort <i>Chara Tomentosa</i> Assemblages. [PDF]
Ecol EvolThe study investigated sediment characteristics associated with Chara tomentosa. The results show that sediment grain size and the concentration of the dissolved phosphate in the porewater differ in the seafloor areas characterised by C. tomentosa from adjacent areas at similar depth, but without charophytes.
Puttonen I +3 more
europepmc +2 more sources
Earth's anomalous middle-age magmatism driven by plate slowdown [PDF]
Scientific Reports, 2022 The mid-Proterozoic or "boring billion" exhibited extremely stable environmental conditions, with little change in atmospheric oxygen levels, and mildly oxygenated shallow oceans.
C. O’Neill +3 more
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Geochemistry, Geophysics, GeosystemsThe formation, storage, and evolution of granitic magmas are fundamental processes driving the growth of continental crust. While traditionally attributed to crystal fractionation in high‐melt fraction magma chambers, the model invoking low‐melt fraction
Wang Li +5 more
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Layering in rapakivi granite, SW Finland [PDF]
Bulletin of the Geological Society of Finland, 1974 Layering in rapakivi granite occurs locally in the islet Söderören, Åland, SW Finland. The layering consists of 3—5 cm thick, rhythmically repeated layers with high concentrations of biotite, hornblende, allanite and olivine.
C. Ehlers
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Cerussite from even-grained rapakivi, Saltvik, Åland Islands, SW Finland [PDF]
Bulletin of the Geological Society of Finland, 1988 Abstract Anisotropy of magnetic susceptibility (AMS) studies were carried out in two areas in Finland: the Ruotsinpyhtaa intrusion within the Wiborg rapakivi granite batholith and the Saltvik intrusions within the Aland rapakivi granite batholith. The main aim of this study was to understand the emplacement history of these mid-Proterozoic rapakivi ...
K. Lindqvist, V. Suominen
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Geologia e Geoquímica do Batólito Rapakivi Rio Branco, SW do Craton Amazônico - MT [PDF]
Geologia USP. Série Científica, 2007 O Batólito Rapakivi Rio Branco está inserido no Domínio Tectônico Cachoeirinha, parte da Província GeocronológicaRio Negro-Juruena, localizado na porção sudoeste do Craton Amazônico em Mato Grosso.
Larissa Marques Barbosa de Araújo-Ruiz +4 more
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On the direction of remanent magnetization of the quartz porphyry dikes in SE Finland [PDF]
Bulletin of the Geological Society of Finland, 1986 Attempts are made to determine the direction of remanent magnetization of the rapakivi varieties belonging to the Wiborg (Viipuri) rapakivi massif and its satellites in the precambrian Baltic Shield. Hard and stable remanence was found only in the quartz
K.J. Neuvonen
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