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Plate Tectonics Earth Formed 3 Billion Years Ago In a scientific study, the Earth has some special features of the planets in the solar system sun. These include major oceans and atmosphere atmosphere that support life of all creatures. Earth, the only planet that has an active outer layer, made of large tectonic plates are layered so as to create mountains, volcanoes, earthquakes and major continents.
Until now, geologists are still debating the process of how the Earth was first formed plate. Some scientists propose that the analysis of the process of establishing the plates began 4.5 billion years ago, near enough time after the formation of the Earth. There is also another analysis that says that all that happened since the last 800 million years.
In this study, scientists from the University of Maryland provides the latest evidence of geochemical results, analysis of the ratio of elements that correlate to the content of magnesium have shown that plate tectonics was first formed approximately three billion years ago. Duterbaitkan scientists study results in the Journal of January 22, 2016 issue of Science.
Birth Home Plate Tectonics
This finding is strong evidence, that the elements insoluble correlated with the main elements and allow you to answer the mysteries of the Earth's history. The evolution of continental crust associated with some of the main geological processes on Earth, such as weathering crust is rich in magnesium may affect ocean chemistry ancient times, a period in which life on Earth evolved.
According to Ming Tang, by linking the composition and crustal plate tectonics, giving clear evidence of Geochemistry of the first order that created the tectonic plates. Because of the tectonic plates needed to build the continent, Analyze this time is a further step in understanding when and how the continents formed.
Plate Tectonics Earth
This study started from zero on one of the key characteristics that distinguish it from the earth's crust geochemistry other planets in the solar system. Compared with Mars, Mercury, Venus, and the moon, continental crust on Earth lack of magnesium. Initially the earth's crust is more like Palnet another with a higher proportion of magnesium.
At some point, the crust began to evolve and contains more granite, poor magnesium form the basis of the continent. Most geologists believe that the beginning of plate tectonics evolved through this transition by absorbing water under the earth's crust, is an important step to make granite. Roberta Rudnick said that no continent without granite, and granite will not be created without the absorption of water into the earth. So, at some point early tectonic plates begin to absorb a lot of water into the mantle.
Magnesium ratio Ancient Stone Plate Tectonics
Logical approach would prove magnesium content contained in ancient rocks have formed throughout the time span. This determines when the transition turned into a low magnesium which eventually form a rock crust. This proved difficult, because direct evidence of low magnesium in the layer of rock beneath the ocean difficult to find on the surface, generally carried by the water soluble.
Scientists rule out this problem by looking at the elements that do not dissolve in water. These elements include nickel, cobalt, chromium and zinc, all of these elements are still there after most magnesium washed away. The ratio of these elements hold the key, the ratio of high nickel in cobalt, chromium and zinc correlates with high magnesium content in the original stone. The ratio of these elements are correlated with magnesium, a highly reliable evidence to prove the magnesium content of the past.
The results showed that 3 billion years ago, the earth's crust has a 11 percent by weight magnesium oxide. In half a billion years later, the element magnesium oxide down to around 4 percent until today continues down to 2 or 3 percent. Evidence of plate tectonics that formed about 3 billion years ago, forming the continent to date.
Scientists collected data trace elements taken from various ancient rocks that formed in the Archean Eon, the period between 4 and 2.5 billion years ago. This trail is used to determine the magnesium content in the rock when it was first formed. They use this data to build a computer model of the geochemical composition of the early Earth.
Reference
New Study Zeros in on Plate Tectonics "Start Date, 21 January 2016, by the University of Maryland.
Journal Ref: Archean upper crust transition from mafic to felsic marks the onset of plate tectonics. Science, 2016
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