Results 181 to 190 of about 6,037 (231)
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Tectonic evolution of the Proterozoic Itremo Group metasediments in central Madagascar
Geological Society, London, Special Publications, 2003Abstract The major geologic units of the Itremo region in central Madagascar include: (1) upper amphibolite to granulite facies (higher grade) Precambrian rocks, mainly para- and orthogneisses, and migmatites; (2) the newly defined Itremo Nappes, a fold-and-thrust belt containing the Proterozoic Itremo Group sediments ...
Fernandez, A., Schreurs, Guido
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Microstructures of intergrown phyllosilicate grains from Verrucano metasediments
1997Interleaved phyllosilicate grains (IPG) of various compositions are widespread in low-grade Verrucano metasediments of the northern Apennines (Italy). They are ellipsoidal or barrel shaped, up to 300-400 mu m long and they are often kinked and folded; phyllosilicate packets occur as continuous lamellae or as wedge-shaped layers terminating inside the ...
GIORGETTI, GIOVANNA +2 more
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Pb isotope disequilibrium in metasediment-derived granitic melts
Radiogenic isotope compositions of magmatic rocks have been widely used to infer the nature of their sources. However, updated studies have demonstrated that crustal derived granites can carry a large magnitude of isotope (Sr, Nd, and Hf) disequilibrium which could be used to infer the melting reactions as well as the nature of sources.Lingsen Zeng, Li-E Gao, Lilong Yan
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Geothermobarometry in metasediments of the southern Grossvenediger area (Tauern Window, Austria)
Journal of Metamorphic Geology, 1990Metasediments in the southern Grossvenediger area (Tauern Window, Austria) were studied along a cross‐section through rocks of increasing metamorphic grade from the margin of the Tauern Window in the south to the base of the Upper Schieferhülle, including the Eclogite Zone, in the north.In the southern part of the cross‐section there is no evidence for
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Coesite in metasediments from the Muzhaerte valley, southwestern Tianshan
Science Bulletin, 2019Zeng, Lü, Lifei, Zhang, Ji, Yue
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Geochemistry and origin of metasediments in the Haliburton–Madoc area, southeastern Ontario
Canadian Journal of Earth Sciences, 1968Ortho- and para-amphibolites and related silicate and carbonate rocks in the Grenville Province in Ontario have been studied in the field and laboratory in order to determine their genesis. X-ray fluorescence chemical analyses for 31 elements in each of 100 rocks of similar types and of greenschist to granulite facies are used to show that the complex
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Petrogenetic meaning of zircon growth stages in metasediments
2012The Cenerigneisses, amphibolite facies metasediments from Serie dei Laghi (Southern Alps), contain heterogeneous zircon populations which gave ages spanning from around 430 to more than 1000 Ma. A detailed chemical study of zircons, supported by careful evaluation of cathodoluminescence images, shows that it is possible to recognize and characterize ...
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PETROLOGIC CHARACTERIZATION OF METASEDIMENTS AT THE KANSANSHI MINE, ZAMBIA
Geological Society of America Abstracts with Programs, 2018Stephen E. Piurkowsky +3 more
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Proceedings of the Geologists' Association, 1959
Abstract The lithology and mode of deposition of a succession of Dalradian metasediments, now in a low-grade metamorphic condition, are described. The succession comprises three units: Gleann Mor Limestone Group Crinan Grits Craignish Phyllites (with Shira Limestone).
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Abstract The lithology and mode of deposition of a succession of Dalradian metasediments, now in a low-grade metamorphic condition, are described. The succession comprises three units: Gleann Mor Limestone Group Crinan Grits Craignish Phyllites (with Shira Limestone).
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