Results 141 to 150 of about 9,921 (184)

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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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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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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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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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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Chemical sedimentary protoliths in the >3.75Ga Nuvvuagittuq Supracrustal Belt (Québec, Canada)

Gondwana Research, 2013
Abstract Analyses of chemical sedimentary precipitates such as banded iron formation (BIF) provide a direct means to explore the nature and composition of the early hydrosphere. The recently discovered > 3750 Myr old Nuvvuagittuq Supracrustal Belt (NSB) in the Northeast Superior Province (Quebec, Canada) hosts a suite of iron oxide-rich (± pyroxene ...
A.M. Mloszewska, S.J. Mojzsis, E. Pecoits, D. Papineau, N. Dauphas, K.O. Konhauser   +5 more
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Protolithe, an art and science project

2014
Concepts: An installation to aprehend as an experience. Innovative technics to reveal what is not obvious. The experience of life as a migration journey. Life delimited by water milestones. Immersive experience (fish point of view?)
Daverat, Françoise, Pécheyran, Christophe, Garnier, Denis, Kurtag, G.   +3 more
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Age, protoliths and tectonic implications of the Toudaoqiao blueschist, Inner Mongolia, China

Journal of Asian Earth Sciences, 2015
Abstract The Toudaoqiao blueschist is located in the northern Great Xing’an Range of China, part of the eastern Central Asian Orogenic Belt, and was discovered in the 1980s, but the age of its formation and metamorphism and the nature of its protolith, have long remained uncertain.
Laicheng Miao, Fochin Zhang, Shujuan Jiao   +2 more
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Protoliths of the 3.8–3.7 Ga Isua greenstone belt, West Greenland

Precambrian Research, 2001
Abstract The Isua greenstone belt ( Fig. 1 ) contains the oldest known, relatively well preserved, metavolcanic and metasedimentary rocks on Earth. The rocks are all deformed and many were substantially altered by metasomatism, but both the deformation and metasomatism were heterogeneous. Transitional stages can be seen from relatively well preserved
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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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