The secular trend of the first ratio appears to be due to the addition of lead, primeval in isotopic composition, from the mantle to the crust of the earth. On the basis of a linear rate of addition of lead, relative to uranium, the following conclusions are reached: 1. 1.The rate ...
the diverse chemical components that exist from core to atmosphere establishes the Earth’s composition. The silicate Earth, or Primitive Mantle, encompasses the crust and mantle. Mostly the systematics seen in the chemical and isotopic compositions of peridotites and primitive, mantle- derived magmas ...
Learn fascinating Earth's crust facts in this lesson, including the two types of Earth crust, its temperature, its thickness and the Earth's crust...
composition of the crust can be reduced by comparing the data for P-wave velocity (Vp), S-wave velocity (Vs), Vp/Vs ratio, mass density (ρ) and Lamé impedances (ρλ, ρμ) to data determined from laboratory measurements of these physical variables on a variety of crustal rock ...
The chemical composition of the Earth, the Moon and chondritic meteorites Katherine H Joy and Tomoko Arai discuss the evidence from lunar meteorites about the shared history of Earth and the Moon. P Gast 被引量: 13发表: 1972年 The Mineral Composition of the Earth's Crust, Mantle, Meteorites...
D-37077 Goettingen, Germany The general acceptance of the definition of the continental crust as the continental part of the outer shell of the planet above the Mohorovi~i6 discontinuity dates back to the fifties of this century (A. Poldervaart: Crust of the Earth. GSA Spec. Pap. 62, 1955...
Evolution of the chemical composition of the earth crust 142Nd variations between chondrites and Earth's mantle are of nucleosynthetic origin, obviating hidden reservoir or super-chondritic Earth models. AI Tugarinov,EV Bibikova - 《Geokhimiya》 被引量: 9发表: 1976年 ...
THE main object of the research described in this monograph was to ascertain the amounts of many of the less common elements, including, certain members of the rare earth series, in the minerals and rocks of the East Indian Archipelago....
Planetary Crusts: Their Composition, Origin and Evolution: Composition and evolution of the continental crust A survey of a large (45,000 analyses) global-wide data base on the chemical composition of the three most abundant rocks of the earth's crust (shales, basa... SR Taylor,S Mclennan ...