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CARBONADO,A POSSIBLE RELIC FROM URANUS OR NEPTUNE

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  CARBONADO,A POSSIBLE RELIC FROM URANUS OR NEPTUNE Serg Io <invliad@invalid.com> - 2017-02-07 14:08 -0600
    Re: CARBONADO,A POSSIBLE RELIC FROM URANUS OR NEPTUNE noTthaTguY <abu.kuanysh05@gmail.com> - 2017-02-07 19:28 -0800

#617426 — CARBONADO,A POSSIBLE RELIC FROM URANUS OR NEPTUNE

CARBONADO
A POSSIBLE RELIC FROM URANUS OR NEPTUNE
standby for carbonado photo
Recognized 1840's
Bahia Province, Brazil

Terrestrial History

The name carbonado, meaning burnt or carbonized in Portuguese, was given 
to this material upon its discovery in Brazil in the 1840's. This dark 
gray to black variant of diamond has been mined in the Bahia Province of 
Brazil since that time. Due to its much greater hardness than typical 
diamond, it is used industrially for drills and for edges in cutting 
implements. Carbonado was subsequently found to occur in the same 
sedimentary geological horizon on a separate continent—in the Ubangui 
region of the Central African Republic, and has also been reported to 
occur in Venezuela and the Soviet Union. Carbonado diamond is unique to 
these limited regions, and it has never been found during any 
conventional diamond mining and processing operations around the world. 
The largest recorded carbonado was found in Brazil and weighed 3,167 
carats (633.4 grams).

In the ongoing debate to explain the circumstances surrounding the 
terrestrial occurrence of this unusual diamond, the theory suggesting 
its arrival during a Precambrian (late Archaean) impact event has been 
gaining ground. This conjectured impact delivery to Earth occurred 
2.6–3.8 b.y. ago, at a time when the present-day continents of South 
America and Africa formed a unified supercontinent. A magnetic anomaly 
discovered in Central Africa, encompassing an area over 700,000 km², has 
also been dated to the Precambrian time. This impact feature, the 
largest known on Earth, might be associated with the delivery of the 
carbonado diamonds.

In a contrary opinion, Master (1998) has proposed that the Precambrian 
feature known as the Kogo Structure in Equatorial Guinea (1° 11' N., 10° 
1' E.), measuring 4.67 km in diameter, would have been situated exactly 
between the Brazilian and Central African carbonado source locations at 
the time of its occurrence. He determined that a direct relationship 
exists between the size of the carbonados and their distance from the 
Kogo Structure, and he suggests that this is the probable impact point 
from which these diamonds were disseminated.

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#617502

Oberon, y'know, King of y'knoW

> In a contrary opinion, Master (1998) has proposed that the Precambrian 
> feature known as the Kogo Structure in Equatorial Guinea (1° 11' N., 10° 
> 1' E.), measuring 4.67 km in diameter, would have been situated exactly 
> between the Brazilian and Central African carbonado source locations at 
> the time of its occurrence. He determined that a direct relationship 
> exists between the size of the carbonados and their distance from the 
> Kogo Structure, and he suggests that this is the probable impact point 
> from which these diamonds were disseminated.

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