Results 171 to 180 of about 2,848 (221)
Some of the next articles are maybe not open access.
Evolution of the granulites and sub-division of the granulite facies in Ceylon
Geological Magazine, 1972SummaryThree subfacies of the granulite facies are recognized: garnet–diopside–quartz subfacies; pyroxene–granulite subfacies; and hornblende–granulite subfacies The erection of a garnet–diopside–quartz subfacies follows De Waard's suggestion (1965) of a garnet–clinopyroxene subfacies.
openaire +1 more source
Garnet granulites from the Lapland Granulite Belt, arctic Finland
2023The Lapland Granulite Belt is an arcuate Paleoproterozoic (c. 1910–1880 Ma) granulite-facies metamorphic complex spanning arctic Finland, Norway, and the Kola Peninsula of Russia.  It has been interpreted as a core zone to the larger Lapland–Kola orogen that formed between the colliding Kola and Karelian Archean continents ...
Jonathan Pownall, Kathryn Cutts
openaire +1 more source
1983
It is apparent from the initial attempts at quantitative tectonic modeling of regional metamorphism (England and Richardson, 1977; Wells, 1980) that a detailed knowledge of metamorphic pressure is essential to the accurate formulation of any tectonic model attempting to incorporate metamorphic pressure—temperature—time relationships.
Steven R. Bohlen +2 more
openaire +1 more source
It is apparent from the initial attempts at quantitative tectonic modeling of regional metamorphism (England and Richardson, 1977; Wells, 1980) that a detailed knowledge of metamorphic pressure is essential to the accurate formulation of any tectonic model attempting to incorporate metamorphic pressure—temperature—time relationships.
Steven R. Bohlen +2 more
openaire +1 more source
1990
Techniques are now available to obtain high precision age information on a variety of metamorphic minerals such as zircon, garnet, monazite, sphene, rutile, hornblende, micas, apatite and feldspars. These ages provide valuable information on the timing of geologic events and duration of processes.
openaire +1 more source
Techniques are now available to obtain high precision age information on a variety of metamorphic minerals such as zircon, garnet, monazite, sphene, rutile, hornblende, micas, apatite and feldspars. These ages provide valuable information on the timing of geologic events and duration of processes.
openaire +1 more source
Journal of the Geological Society, 1981
Granulites can form at every stage of the Wilson cycle: during plate accretion (Mid-Atlantic Ridge), in active plate margins of island-arc and Andean type (Ivrea Zone, main complex in Kohistan in the Karakorums), in the roots of Andean-type batholiths (Coast Range Complex, British Columbia; Santa Lucia Range of California), during the closure of a ...
openaire +1 more source
Granulites can form at every stage of the Wilson cycle: during plate accretion (Mid-Atlantic Ridge), in active plate margins of island-arc and Andean type (Ivrea Zone, main complex in Kohistan in the Karakorums), in the roots of Andean-type batholiths (Coast Range Complex, British Columbia; Santa Lucia Range of California), during the closure of a ...
openaire +1 more source
On the formation of granulites
Journal of Metamorphic Geology, 1991The tectonic settings for the formation and evolution of regional granulite terranes and the lowermost continental crust can be deduced from pressure–temperature–time (P–T–time) paths and constrained by petrological and geophysical considerations. P–T conditions deduced for regional granulites require transient, average geothermal gradients of greater ...
openaire +1 more source
Geochemical Comparison of Archaean Granulites in India with Proterozoic Granulites in Canada
1978Abstract The charnockitic gneisses of North Arcot, Tamil Nadu, have a bimodal compositional distribution. The basic granulites show a tholeiitic Fe-rich trend, while the intermediate and acid charnockites show a calc-alkaline one, A similar compositional variation is apparent in amphibolite facies gneisses and asscciated mafic rocks and in the low ...
G.V. Anantha Iyer, T.R. Narayanan Kutty
openaire +1 more source
Amphibolitization of Scourian granulites
Scottish Journal of Geology, 1974Synopsis Scourian granulite-facies gneisses from north-west Scotland occur as relict masses surrounded by amphibolitized granulites. During amphibolitization the gneisses suffered both deformation and metamorphism. Ortho- and clinopyroxenes were replaced by hornblende and hornblende-quartz intergrowths forming corona textures.
openaire +1 more source