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Figure 1 An example of an organophilic element (Re) forming an organic-complex.

The Rhenium isotope Os isotope in order to calculate an isochron for the Kimmeridge Clay Formation from Dorset, UK.

Argon does not react with the filament in a lightbulb even under high temperatures, so is used in lighting and in other cases where diatomic nitrogen is an unsuitable (semi-)inert gas.

The Martian atmosphere in contrast contains 1.6% of Ar-40 and 5 ppm Ar-36.

World production exceeds 750.000 tonnes per year, the supply is virtually inexhaustible.

Argon was suspected to be present in air by Henry Cavendish in 1785 but wasn't discovered until 1894 by Lord Rayleigh and Sir William Ramsay.

Argon is the third noble gas, in period 8, and it makes up about 1% of the Earth's atmosphere.

Iron is found native in meteorites known as siderites.

Isolation: it is not normally necessary to make iron in the laboratory as it is available commercially.The most prized specimens for research are flawed with visible inclusions (figure 2), for these carry actual samples of mantle minerals from depths as great as 800 km beneath the surface.Diamond provides the perfect container for mantle minerals, isolating them from the high pressure and temperature reactions within the earth for geologic time scales.Both Re and Os display organophilic behaviour and can form amino acid complexes (Figure 1).Organic-rich muds are a significant crustal reservoir of Re & Os with concentrations of up to 300 ppb of Re and 3 ppb of Os, more than two orders of magnitude higher than the average crustal abundance (Creaser et al., 2002).The derived age of 155.82Ma is consistent with the Kimmeridgian (Upper Jurassic) age of deposition indicated from biostratigraphy.

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