Results 121 to 130 of about 479 (172)
Sr isotopic composition of Finnish rapakivi granites: the Suomenniemi batholith
Bulletin of the Geological Society of Finland, 1999 openaire +2 more sources
Some of the next articles are maybe not open access.
Related searches:
Related searches:
Tectonophysics, 2014
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 ...
Carl Ehlers
exaly +2 more sources
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 ...
Carl Ehlers
exaly +2 more sources
One hundred years of rapakivi granite
Mineralogy and Petrology, 1995Rapakivi 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 ...
Ilmari Haapala, O T Ramó
exaly +2 more sources
The Soca intrusion: a rapakivi granite of Uruguay
Journal of South American Earth Sciences, 1998Abstract The Soca granite, emplaced in the Rio de la Plata Craton, is located 65 km east of Montevideo. It is a homogeneous porphyritic leucogranite, with almost 75 km 2 of exposed area. Petrographically, the Soca granite is characterized by the occurrence of quartz, plagioclase and alkaline feldspar in two generations, ferrous pyroxene, mica ...
Rossana Muzio +1 more
exaly +2 more sources
Rapakivi granites, South Greenland: hydrothermal alteration of igneous layering
Journal of the Geological Society, 1990 Igneous layering is developed in the Proterozoic rapakivi granite suite of South Greenland in an area on the south-easternmost coast of the island of Angnikitsoq. The layering at this locality is unusual in that it is defined by interstitial phases. We suggest that large-scale hydrothermal alteration has converted a fine-grained pyroxene cumulate, in ...
ADRIAN A. FINCH +3 more
openaire +2 more sources
Elastic anisotropy, permeability, and freeze-thaw cycling of rapakivi granite
International Journal of Rock Mechanics and Minings Sciences, 2020Abstract Due to the ice-water transition, frost weathering in cold regions has always been in focus as a rock deterioration mechanism. Internal stresses, developed by this process, conduce to progressive fracturing and consequent changes in rock properties, particularly, elastic velocities. Previous research was mainly focused on isotropic properties
M Petružálek +2 more
exaly +2 more sources
Gff, 2016 This contribution presents complimentary mineralogical and whole-rock chemical data for the Mullnäset rapakivi massif. Three rock types occur: gabbro, syenite with associated granite and “normal” rapakivi granite, here denoted rapakivi-textured granite ...
Anders Lindh
exaly +3 more sources
Rapakivi granite problems: plagioclase mantles and ovoid megacrysts
Australian Journal of Earth Sciences, 2016ABSTRACTMantling 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
Bacterial weathering of rapakivi granite
Geomicrobiology Journal, 1981Rapakivi granite samples were incubated with Pseudomonas aeruginosa culture solutions in order to elucidate the possible role of bacteria in rapakivi (crumbling stone) disintegration. SEM micrographs showed micromorphological alterations on the incubated rapakivi surface at 21 to 23°C for 20 days.
Antti Vuorinen +3 more
openaire +1 more source
Rapakivi granite, anorthosite and charnockitic plutonism
Nature, 1978THE close association of massive anorthosite and charnockitic granitic rocks is well documented1. Rare earth element (REE) investigations2–4 have indicated that the massive charnockite (mangerite) associated with anorthosite is not comagmatic with it but represents a distinct magma fraction.
F. H. HUBBARD, J. E. WHITLEY
openaire +1 more source