Abstract
Synopsis Permian sandstones from the Cock of Arran area contain small amounts of sphene cement. The sphene occurs as a minor phase (up to 2%) in small patches cementing several grains, and as individual crystals with well developed crystal faces grown into pore space from quartz, feldspar or lithic grain surfaces. The sphene postdates the growth of red grain pellicles and chlorite rosettes and probably formed at a time of calcite dissolution and creation of secondary porosity. Sphene is apparently absent from Permian sandstones at Corrie and Brodick. It is postulated that the sphene was deposited from convective fluids associated with the intrusion of the Arran Granite in Tertiary times. Ti was probably derived from the alteration of Ti-bearing oxides and volcanic rock fragments in the sandstones.
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