Geological dating isotope
Since Sr is taken up by aquatic organisms in equilibrium with the surrounding water it is possible to use their fossilised remains as a proxy for oceanic seawater.Suitable material includes molluscs, foraminifera, conodonts, fish teeth and calcareous algae.This database includes all published and many unpublished Sr ratios which have first been subjected to a vetting procedure and weighted for stratigraphical, biostratigraphical and chemical accuracy.
There is no evidence that gold mineralisation is associated with distinctive source regions, and it appears to have been derived from similar sources to those responsible for the widespread sulphide mineralisation in Ireland.
It is inferred that the principal controls on the Au mineralisation are structural and not related to the distribution of Au in their source rocks.
Turnaround time is normally 3-4 weeks from receipt of samples. In terms of geological time oceanic mixing is instantaneous.
The assumption that the Sr ratio of the world’s oceans has fluctuated uniformly through time has enabled a Global Standard Strontium Curve (GSSC) to be established (Howarth and Mc Arthur, 1997).
Geological Magazine, established in 1864, is one of the oldest and best-known periodicals in the Earth Sciences.
Its worldwide circulation, broad scope and high production values keep the journal at the forefront of the field.
In reality the comparison is made with the Global Strandard Strontium Curve using a “look up” table.
) is an earth science concerned with the solid Earth, the rocks of which it is composed, and the processes by which they change over time.
The range of Pb isotope ratios favours the interaction of multiple source reservoirs predominantly during the Caledonian Orogeny (c. Underlying basement was the primary control on two key sources of Pb.
Gold occurrences located to the south-east of the Iapetus Suture are characterised by Pb compositions that derive predominantly from the Late Proterozoic crustal basement or overlying Lower Palaeozoic sediments, whilst those located north-west of the Iapetus Suture are characterised by less radiogenic Pb signatures derived predominantly from Late Proterozoic or older crustal basement.
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