Results 161 to 170 of about 5,077 (206)

Continental crust in Gorny Altai: nature and composition of protoliths

Russian Geology and Geophysics, 2010
Abstract The history of the Vendian–Early Paleozoic formation of protoliths of continental crust in the Gorny Altai segment of the Central Asian fold belt is considered, and their composition, isotopic characteristics, and formation mechanisms are estimated.
N.N. Kruk, A.G. Vladimirov, G.A. Babin, S.P. Shokalsky, N.V. Sennikov, S.N. Rudnev, N.I. Volkova, V.P. Kovach, P.A. Serov   +8 more
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New evidence for protolith ages of Lewisian granulites, northwest Scotland

Geology, 1995
The granulite facies Scourian rocks in the central region of the Lewisian complex of northwest Scotland play an important role in the understanding of the development of mid-Archean high-grade gneiss complexes. Whereas the later, largely Proterozoic history of the Scourian has been clarified in a detailed U-Pb study, unraveling the Archean ages of the ...
C. R. L. Friend, P. D. Kinny
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Titanium isotopes in detrital sediments: A reliable proxy for the protoliths composition?

2022
<p>Recently, non-traditional stable isotope systems have become new tools to track weathering and sediment transport processes and to obtain information about the lithological and chemical composition of drainage networks. Because the Ti isotope composition (δ<sup>49</sup>Ti) increases with the SiO&
Nicolas Vilela, Hendrik Vogel, James M. Russell, Satria Bijaksana, Nicolas D. Greber   +4 more
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Protolith

Colorado Review
Abstract: This five-part essay melds the author’s personal attachment to gold with a larger rumination on the cultural valences of the metal across India and the American West. The essay considers the personal implications of claiming: a history, a stretch of land, a piece of gold.
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Diamondiferous eclogites from Yakutia, Siberia: evidence for a diversity of protoliths

Contributions to Mineralogy and Petrology, 1993
Major-element and REE compositions of 14 diamondiferous eclogites from the Udachnaya kimberlite in Yakutia, Siberia have been determined by electron microprobe and secondary ion mass spectrometer (SIMS). Based on previous clinopyroxene classification schemes (e.g., Taylor and Neal 1989), all of these eclogite xenoliths belong to Group B/C, although ...
Eric A. Jerde, Lawrence A. Taylor, Ghislaine Crozaz, Nikolai V. Sobolev, Vladimir N. Sobolev   +4 more
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Quartz-spessartine metasediments (coticules) and their protoliths in North Wales

Geological Magazine, 1989
AbstractThin beds and small pods of quartz-spessartine metasediments (coticules) occur in pelites of the Gamlan Formation (Cambrian) of the Harlech Dome. The original microfabric of these sediments has been largely destroyed by recrystallization under low greenschist facies conditions. The quartz-spessartine pods occur throughout the pelites and appear
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The Kerguelen Archipelago: a Hypothetic Continental Mafic Protolith

1995
info:eu-repo/semantics ...
Gregoire, M., Cottin, Jean-Yves, Mattielli, Nadine, Nicollet, C, Weis, Dominique, Giret, A   +5 more
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Highly siderophile element abundances in Eoarchean komatiite and basalt protoliths

Contributions to Mineralogy and Petrology, 2016
Plume-derived, Mg-rich, volcanic rocks (komatiites, high-Mg basalts, and their metamorphic equivalents) can record secular changes in the highly siderophile element (HSE) abundances of mantle sources. An apparent secular time-dependent enrichment trend in HSE abundances from Paleoarchean to Paleoproterozoic mantle-derived rocks could represent the ...
Elizabeth A. Frank, Wolfgang D. Maier, Stephen J. Mojzsis   +2 more
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Geochemical signatures for eclogite protolith from the Maksyutov Complex, South Urals

Journal of Asian Earth Sciences, 2004
Abstract We conducted a geochemical study of eclogites (40 samples) from a boudin of the Lower Unit of the Maksyutov Complex in the South Urals in order to determine their protolith nature. The eclogites have major element compositions corresponding to quartz-bearing hypersthene basalts.
N.I. Volkova, A.E. Frenkel, V.I. Budanov, G.G. Lepezin   +3 more
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SEDIMENTARY PROTOLITHS OF ADIRONDACK GRAPHITE DEPOSITS

Geological Society of America Abstracts with Programs, 2022
Fredric LeClair, Katia Childs, William Peck   +2 more
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