Scientists long believed that Earth’s lower mantle was composed of Bridgmanite (Mg,Fe)SiO3 and magnesiowüstite (Mg,Fe)O, in which Fe2+ dwells. This view changed when experiments showed that Fe2+ simply can’t exist at the pressure and temperature of the lower mantle. What is present is Fe3+. The two phases (Mg,Fe)SiO3 and (Mg,Fe)O both shed Fe2+ and, in turn, MgSiO3 and MgO remain. However, what mineral hosts Fe3+ had remained unknown.
Complete Article From the publisher.Heat is transported through the ocean by a deep-ocean circulation system, known as the global heat conveyor belt, which constantly circulates water around the globe and helps to balance the earth’s […]
Complete Article From the publisher.A team of researchers from Japan, Mongolia and the U.K. has developed a new theory to explain the origin of iron-oxide concretions (hard, solid masses) found in Utah and Mongolia. In […]
Complete Article From the publisher.Arctic sea ice loss in the last 37 year is not due to humans alone.