Results 181 to 190 of about 5,596 (229)

Subducted carbon weakens the forearc mantle wedge in a warm subduction zone. [PDF]

Nat Commun
Oyanagi R, Okamoto A.
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Geochemistry of Vendian (?) Metasedimentary Rocks of the Byrka Series of the Argun Superterrane

Geochemistry International, 2022
Yu N Smirnova, S I Dril, Smirnova Yu N
exaly   +2 more sources

Amphibolitization of calc-silicate metasedimentary rocks

Contributions to Mineralogy and Petrology, 1971
Diopside granofels layers are associated with other metasedimentary rocks and gneisses near McMurdo Sound, Antarctica. Disrupted diopside granofels layers form tectonic inclusions which may have reaction rims of amphibolite. This amphibolite may either be a typical hornblende-plagioclase amphiholite or a hornblende-quartz amphibolite according to the ...
Smithson, Scott, Fikkan, Philip, Houston, Robert S.   +2 more
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Microstructures of melt inclusions in anatectic metasedimentary rocks

Journal of Metamorphic Geology, 2012
AbstractThe occurrence of crystallized and glassy melt inclusions (MI) in high‐grade, partially melted metapelites and metagraywackes has opened up new possibilities to investigate anatectic processes. The present study focuses on three case studies: khondalites from the Kerala Khondalite Belt (India), the Ronda migmatites (Spain), and the Barun Gneiss
FERRERO, SILVIO, BARTOLI, OMAR, CESARE, BERNARDO, E. SALVIOLI MARIANI, A. ACOSTA VIGIL, A. CAVALLO, C. GROPPO, S. BATTISTON   +7 more
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Geochemistry of Archean metasedimentary rocks from West Greenland

Geochimica et Cosmochimica Acta, 1984
Abstract Archean metasedimentary rocks occur as components of the Isua supracrustals, Akilia association and Malene supracrustals of southern West Greenland. Primary structures in these rocks have been destroyed by metamorphism and deformation. Their chemistry and mineralogy is consistent with a sedimentary origin, but other possible parents (e.g ...
Scott M McLennan, S.R Taylor, V.R McGregor   +2 more
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Isotope disequilibrium during partial melting of metasedimentary rocks

Geochimica et Cosmochimica Acta, 2019
Abstract The chemical composition of partial melts is buffered by the rock forming minerals that participate in the melting reactions and by the solubility of accessory phases in these melts. Both depend on the melting conditions. The chemical composition of restite depends on the restite mineralogy and may be highly variable.
Mathias Wolf, Rolf L. Romer, Johannes Glodny   +2 more
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Partial melting of common metasedimentary rocks: A mass balance approach

Contributions to Mineralogy and Petrology, 1980
Materials balance calculations are presented to document the progressive bulk chemical changes in metagreywacke and metapelite with separation of increments of granite of minimum melt composition. During partial melting, enrichment of Fe relative to Mg in granite and strong absorption of water leave residual rocks with increasing proportions of such Mg-
MacRae, N. D., Nesbitt, H. W.
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Subsolidus segregation of quartz in metamorphic differentiation of metasedimentary rocks

Doklady Earth Sciences, 2017
Thermodynamic modeling of the SiO2–TiO2–Al2O3–Fe2O3–MnO–MgO–CaO–Na2O–K2O–P2O5–H2O (STAFMMCNKPOH) system at 600°C, 5 kbar has been applied to investigate dissolution and re-precipitation of quartz. Comparing silica molality in the STAFMMCNKPOH and SiO2–H2O systems, there is seen to be no effect of mineral assemblage on quartz solubility.
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Geochronology of sedimentary and metasedimentary Precambrian rocks of the West African craton

Precambrian Research, 1982
Abstract This contribution summarizes current knowledge of the geochronology of the Upper Proterozoic sedimentary rocks covering the West African craton. This was done by using direct dating methods. Correlations between the northern edge of the Tindouf basin and the northern and southern part of the Taoudeni basin, as well as the Volta basin, are ...
Norbert Clauer, Renaud Caby, Daniel Jeannette, Roland Trompette   +3 more
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GRAPHITIZATION OF METASEDIMENTARY ROCKS IN THE WESTERN KONYA

2015
The Paleozoic-Mesozoic metasedimentary rocks in the study area are metacarbonate, metachert, metapelite, metasandstone and metaconglomerate. Graphite layers are 1cm to 2m thick, extend laterally for tens of meters and are intercalated with metasedimentary rocks.
KURT, Hüseyin, EREN, Yaşar
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