Hydridic Earth theory
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Hydridic Earth theory is a hypothesis proposed in 1968 by a Soviet geologist Vladimir Larin. The theory contradicts the generally accepted views on Earth composition and structure. The theory makes certain prediction that can be falsified or proven through experiments.
Starting with first principles, Dr. Larin proposed an explanation for the observed distribution of elements throughout Solar system. Solar wind in the primordial system pushed elements away from the center. The elements with lower ionization potentials were trapped by the Sun's magnetic field and held closer to the sun, the elements with higher ionization potentials were pushed to the outer fringes. Assuming that the primordial abundance of the elements was similar to the current composition of the sun, the scheme accounts for the present rocky and metallic inner planets and gaseous outer planets.
The described distribution scheme suggested that Earth must contain orders of magnitute more hydrogen than actually observed. To account for it, Dr. Larin made the most controversial suggestion of metallic composition for the middle and lower mantle in the form of metal hydrides. He suggested that the silicate-oxide composition is confined to the upper mantle and crust primarily.
The theory made some predictions that were later found to be correct, such as predicting metal particles in Siberian lava fields. It can also naturally explain hydrogen venting from the ocean floor, and answer some question in the isotope dating of the Rb-Sr, Sm-Nd, and U-Pb systems.
The theory also makes a prediction that, if proven correct, may have the most profound implications for the energy production and hydrogen economy. There are a few places on Earth where mantle comes sufficiently close (5-8km) to the surface to make drilling practical. Such well could be used for "mining" hydrogen, much like mining the natural gas or oil.
