Before subsequent combustion, the sample was degasified under vacuum.
The resultant graphite was then analysed for radiocarbon using the laboratory's state-of-the-art AMS system.
As these eruptions finished, the resultant breccias subsided into the deep holes from which the magmas had been blasted into ash and steam, taking with them the wood debris and burying it.
Radiocarbon Analyses Some very small splinter-like fragments, collectively weighing 128 milligrams, were gently broken off from one end of the piece of carbonized fossil wood that was found in July 1947 in the Cresson Mine.
has similarly reported measurable radiocarbon in ancient organic materials, well above the threshold of the accelerator mass spectrometry (AMS) analytical technology used, including ten samples of US coals spanning 45-300 million years of the conventional timescale for the geologic record.
Meticulous laboratory procedures rule out the possibility that this measured radiocarbon is due to contamination, so it must instead be intrinsic to these ancient organic materials.
However, such is the rapid decay of radiocarbon (C), with a half-life of 5,730 years, that even after only 250,000 years there should be no detectable radiocarbon left.
Thus, organic materials supposedly millions of years old should not contain any radiocarbon whatsoever.
The averaged radiocarbon analysis reported by the laboratory, after the laboratory "background correction" of 0.077 percent modern carbon was subtracted, was 0.588 ± 0.069 percent modern carbon.Cripple Creek, Colorado Cripple Creek is the premier gold mining district of Colorado, having produced more than 23 million ounces of gold since 1891.The gold is found in veins and surrounding rocks associated with a small (six square mile) volcanic complex that is supposedly 32 million years old (Oligocene), as determined by Ar-Ar radioisotope dating.Ancient Fossil Wood Historic reports are common of early miners encountering pieces of petrified and coalified wood in the deep workings of the mines.Many tree parts, ranging from small pieces of wood up to logs, trunks and a whole stump, have been found mixed in with the Cripple Creek Breccia that hosts the gold mineralization.The laboratory reported that the dried residue consisted of needles with a carbon content normal for organic material.A very short chlorite bleach treatment then had to be used because the sample rapidly oxidized.First, a high-temperature fluid flow phase caused alteration of the host volcanic rocks and increased their permeability.Then a subsequent low-temperature fluid flow phase deposited in steeply dipping veins and disseminated gold into the porous wall rocks.The Cresson Mine (Figure 1) exploits the most valuable deposit in the district, having produced more than 3 million ounces of gold.Its gold mineralization is associated with an ultramafic lamprophyre pipe, which at supposedly 27 million years old was one of the last volcanic events to occur in the district.