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io appendix 1. For compar.uive purposes the data hive bct'n recalculated 10 100"
volalile frcc. Trace eltment 4al.l. hive no! been rccakulafed, ~owcver. bca~ Ihis does
no! s«m 10 have been the practice among mDSl authors who have siudied trace clements
in sandstones (e.g. Hiscott. 1984; Van de Kamp arid l.e3ke. 1985).
, I J GrsxihrmislCypfSandstor'N - DiSynion
There has been some disagrcemenl as 10 wbtlhcr shales or sandstones can he
considered more accurart: indicalOn of provenance (e.l. Blatt. 1985; Van de KUIp and
Leake. 1985). Blall (1985) has argued thai mudroct.s may in some inslances be superior
to sandstones because of their gruter impermeability and hence their gre.1ltr ftsistance
(0 diagenetic effects. However. shales, with their hip clay mineral content. may contain
a significam amount of adsorbed material which renetlS the chemistry of the seawater.
Seawaler cheminry is a function of a number of faclOrs and may !lOt be entirely
reflective of provenance. Several authors have nolcd that the most romplelc
c~lCrisalion of the cbemisuy of a sedimenlary unit should toe based 00 analyses of
both W!dslones and any iolCrbcdded shales (Van de Kamp and l...c:ake. 1985: Roser and
Korsch. 1986, 1988). Van de Kamp and Lulte (1985)concludcd, on Ihc basis ofsut"h
an iOlegrated siudy, thai chemically, sandstoneS are bnter indicalOfs of provenance than
Interpretation of chemical :':Illyses of sandstones should be made with caution.
Faclors which affect sandstone chemistry are similar to those which affect framework
grain proponions and include provenal'l(;r., weathering, mode of deposition and