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Possible sources of clastic sediment in the Late Proterozoic Torridon Group, from geochemical mass balance
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- Journal:
- Transactions of the Royal Society of Edinburgh: Earth Sciences / Volume 85 / Issue 4 / 1994
- Published online by Cambridge University Press:
- 03 November 2011, pp. 303-309
- Print publication:
- 1994
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- Article
- Export citation
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Equations are derived which link the content of relatively insoluble components Si, Al, Fe and K in source rock and derived alluvial sediment. The equations also involve the ratio of specific suspended load to dissolved load
and specific bed load to suspended load (Tb/Ts) for the rivers which deposited the sediments. These ratios are generally unknown, but by analogy with modern rivers are taken to occupy the ranges 
and 0 ≦ Tb/Ts≦1. This is sufficient to put close limits on the possible composition of the source rock. The equations suggest that clastic sediment forming the Late Proterozoic Torridon Group of Scotland was derived from sediments or metasediments, rather than from average upper continental crust, granitoids or gneisses like those presently exposed nearby.
and specific bed load to suspended load (
and 0 ≦ 