Results 171 to 180 of about 5,043 (208)

Compositions and Sources of Metasediments in the Upper Dharwar Supergroup, South India

The Journal of Geology, 1986
Texturally mature, quartz-rich sandstones, texturally mature, mafic-rich sandstones, and texturally immature graywackes are abundant in the late Archean Chitradurga Group of the Dharwar craton in South India. When compared to graywackes of Paleozoic age from northeastern North America, the Chitradurga graywackes have slightly higher average ...
Scott Argast, Thomas W. Donnelly
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U–Pb zircon provenance of Moldanubian metasediments in the Bohemian Massif

Journal of the Geological Society, 2013
Detrital zircon U–Pb age data from the Moldanubian part of the Bohemian Massif obtained by laser ablation inductively coupled plasma mass spectrometry show variations between the lithotectonic units and point to their formation in spatially close but separated basins that were supplied by detritus from somewhat different source areas, possibly over ...
Jan Košler, Jiří Konopásek, Jiří Sláma, Stanislav Vrána   +3 more
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Microstructures of intergrown phyllosilicate grains from Verrucano metasediments

1997
Interleaved 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, TURBANTI, I., NIETO, F.   +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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Coesite in metasediments from the Muzhaerte valley, southwestern Tianshan

Science Bulletin, 2019
Zeng, Lü, Lifei, Zhang, Ji, Yue
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Palaeocurrents and sedimentary facies of the Dalradian metasediments of the Craignish—Kilmelfort district

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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PETROLOGIC CHARACTERIZATION OF METASEDIMENTS AT THE KANSANSHI MINE, ZAMBIA

Geological Society of America Abstracts with Programs, 2018
Stephen E. Piurkowsky, Timothy J. MacIntyre, Alexander P. Gysi, Murray W. Hitzman   +3 more
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Metasediment

2022
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Metasediments Covering Ophiolites in the HP Internal Belt of the Western Alps: Review of Tectono-Stratigraphic Successions and Constraints for the Alpine Evolution

Minerals (Basel, Switzerland), 2021
Gianni Balestro, Andrea Festa, Paola Tartarotti   +2 more
exaly  

Pre-Cambrian Metasediments in Grand Teton National Park, Wyoming

American Journal of Science, 1942
C. L. Horberg, F. M. Fryxell
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