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Science

BIG DIAMONDS EXPLAIN INTERNAL FUCTION OF THE EARTH

LBig diamonds explain internal function of the mantle of the Earth, inaccessible to scientific observation, according to new studios


A team led by post-doctoral researcher Evan Smith from Gemological Institute of America (GIA) examined the size and quality of diamonds to uncover clues about Earth’s geology, according to Science.

The researchers studied the properties of diamonds with similar characteristics to famous stones like the “Star of the South”; “The Constellation”, one of the most expensive brilliant in the world; and Koh-i-Noor, that means “Mountain of Light”.

The results can help a better understanding of the recycling of surface rocks in the mantle of the Earth and a better understanding of the storage and deep cycle of carbon and hydrogen in the mantle through geological time.

“It solves one of the greatest riddles of diamond formation: how was formed the largest and most valuable diamonds,” Smith explained.

The metallic inclusions and methane and hydrogen surrounding these diamonds provide a “consistent and systematic physical evidence” that shows what some research already predicted that these precious diamonds were to a depth of more than 250 kilometers and contained small amounts of iron Metallic and limited oxygen.

“Some of the largest and most valuable diamonds, such as the Cullinan or ‘Lesotho Promise’, exhibit physical characteristics that have led many to consider them different from other more common diamonds,” assured research and development director of the study in GIA, Dr. Wuyi Wang.

“However,” he added, “the way these diamonds are formed and what it carried on Earth has remained a mystery until now.”

This type of diamonds, similar to Cullinan, differs from the rest, as it sometimes has small metallic inclusions that coexist with traces of methane and hydrogen fluids.

In addition, some contain mineral inclusions that demonstrate that these precious diamonds were formed at high depths of between 360 and 750 kilometers in the convection of the mantle, rather than to a depth of between 150 and 200 kilometers, in the continental part of the tectonic plates, like the rest.


Washington, December 16, 2016, EFE/Practica Español


Grammar notes: review of the Spanish prepositions ‘en’ and ‘a’


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