Recycling of continental crust into the mantle as revealed by Kytlym dunite zircons, Ural Mts, Russia
نویسندگان
چکیده
منابع مشابه
Chemical differentiation of the Earth: the relationship between mantle, continental crust, and oceanic crust
The average chemical compositions of the continental crust and the oceanic crust (represented by MORB), normalized to primitive mantle values and plotted as functions of the apparent bulk partition coefficient of each element, form surprisingly simple, complementary concentration patterns. In the continental crust, the maximum concentrations are on the order of 50 to 100 times the primitive-man...
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The exact solutions for the isotopic compositions and the concentrations of the two-reservoir model for mantle-crust evolution are given for arbitrary rates of crustal growth and of back flow to the mantle. The critical parameters are the chemical fractionation factors for crustal growth and refluxing and the integrated fractional mass-removal rates from the crust and the mantle. For the case w...
متن کاملDifferentiation of the continental crust by relamination
a r t i c l e i n f o Crust extracted from the mantle in arcs is refined into continental crust in subduction zones. During sediment subduction, subduction erosion, arc subduction, and continent subduction, mafic rocks become eclogite and may sink into the mantle, whereas more silica-rich rocks are transformed into felsic gneisses that are less dense than peridotite but more dense than the uppe...
متن کاملConstraints on the Geochemical Variations and Evolution of the Lunar Crust and Mantle as Revealed
Introduction: Basaltic volcanism is a fundamental process that has occurred on most terrestrial planets like Earth, Moon, and Mars. As partial melts of planetary interiors, basalts have compositions that reflect the planet’s bulk composition, its oxidation state, and the size and composition of its core. Several previous studies have compared bulk-rock major-, minor-, and traceelement compositi...
متن کاملArchaean zircons in Miocene oceanic hotspot rocks establish ancient continental crust beneath Mauritius
A fragment of continental crust has been postulated to underlie the young plume-related lavas of the Indian Ocean island of Mauritius based on the recovery of Proterozoic zircons from basaltic beach sands. Here we document the first U-Pb zircon ages recovered directly from 5.7 Ma Mauritian trachytic rocks. We identified concordant Archaean xenocrystic zircons ranging in age between 2.5 and 3.0 ...
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ژورنال
عنوان ژورنال: Terra Nova
سال: 2001
ISSN: 0954-4879,1365-3121
DOI: 10.1046/j.1365-3121.2001.00364.x