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...
متن کاملAGU Planet Earth Committee Report Part II Interior and Crust
T h e Ear th ' s man t l e , core , a n d crus t com prise 9 9 . 9 8 % of its mass . T h e man t l e , m a k i n g u p t he bulk of t he mass at 70% a n d com posed of h i g h e r densi ty rocks (rich in m a g n e sium silicates, p lus some i ron silicates), ex t ends an average of 1 5 2 9 0 0 km d e e p . T h e core is the cen te r of t he Ea r th , 2 9 0 0 6 3 7 0 km d e e p , c o m p o ...
متن کاملThe Origin of Methane (and Oil) in the Crust of the Earth
The deposits of hydrocarbons in the crust of the Earth have long been regarded by many investigators as deriving from materials incorporated in the mantle at the time of the Earth's formation. Outgassing processes, active in all geological epochs, then transported the liquids and gases liberated there into porous rocks of the crust. The alternative viewpoint, that biological debris was the sour...
متن کاملNeutron flux variations near the Earth?s crust. A possible tectonic activity detection
The present work contains some results of observations of neutron flux variations near the Earth’s surface. The Earth’s crust is determined to be a significant source of thermal and slow neutrons, originated from the interaction between the nuclei of the elements of the Earth’s crust and the atmosphere and α−particles, produced by decay of radioactive gases (Radon, Thoron and Actinon). In turn,...
متن کاملthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: Nature
سال: 1974
ISSN: 0028-0836,1476-4687
DOI: 10.1038/250686a0