marekk napisał(a):Witam , czy Carbonado jest najstarszą materią kosmiczną która spadła na ziemię .I czy jej skład jest związany z materią która powstała po wybuchu pradawnej supernowej dała początek naszemu układowi słonecznemu .
Ciężko powiedzieć bo jest to tylko jedna z teorii a dokładniej jedna z pięciu teorii:
The origin of carbonado is controversial. Some proposed hypotheses are as follows:
1. Direct conversion of organic carbon under high-pressure conditions in the Earth's interior, the most common hypothesis for diamond formation
2. Shock metamorphism induced by meteoritic impact at the Earth's surface
3. Radiation-induced diamond formation by spontaneous fission of uranium and thorium
4. Formation inside an earlier-generation giant star in our area, that would have long ago exploded in a supernova.[3]
5. An origin in interstellar space, due to the impact of an asteroid, rather than being thrown from within an exploding star.[3]
Extraterrestrial origin hypothesis
Supporters of an extraterrestrial origin of carbonados, such as Dr. Stephen Haggerty, a geoscientist from Florida International University, propose that their material source was a supernova which occurred at least 3.8 billion years ago. After coalescing and drifting through outer space for about one and a half billion years, a large mass fell to earth as a meteor approximately 2.3 billion years ago, possibly fragmenting during entry into the Earth's atmosphere, and impacting in a region which would much later split into Brazil and the Central African Republic, the only two known locations of carbonado deposits.[5]
None of these hypotheses for carbonado formation had come into wide acceptance in the scientific literature by 2008.[4]
źódło:
http://en.wikipedia.org/wiki/Carbonado
Napisane: Cz wrz 29, 2011 10:05 am