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These two different source of carbon have measurably different —150 km (93 mi) or more (three times or more the depth of source magma for most volcanoes). These typically small surface volcanic craters extend downward in formations known as volcanic pipes.
The pipes contain material that was transported toward the surface by volcanic action, but was not ejected before the volcanic activity ceased.
These depths are estimated between 140 and 190 kilometers (87 and 118 mi) though occasionally diamonds have crystallized at depths about 300 km (190 mi).
The rate at which temperature changes with increasing depth into the Earth varies greatly in different parts of the Earth.
An alternative, and completely different growth technique is chemical vapor deposition (CVD).
Carbon-containing minerals provide the carbon source, and the growth occurs over periods from 1 billion to 3.3 billion years (25% to 75% of the age of the Earth).
Long residence in the cratonic lithosphere allows diamond crystals to grow larger.
Through studies of carbon isotope ratios (similar to the methodology used in carbon dating, except with the stable isotopes C-12 and C-13), it has been shown that the carbon found in diamonds comes from both inorganic and organic sources.
This is because cratons are very thick, and their lithospheric mantle extends to great enough depth that diamonds are stable.
Not all pipes contain diamonds, and even fewer contain enough diamonds to make mining economically viable.
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Some diamonds, known as harzburgitic, are formed from inorganic carbon originally found deep in the Earth's mantle.