Calcite coastal waters

Seasonal evolution of equilibrium calcite in coastal waters and Scottish fjordic environments... 

The oxygen isotope composition of seawater (8 0 rater) was Calculated using a regional sahnity 8 Owater relationship estabhshed for Scottish coastal waters (method in Austin InaU 2002 Austin et al. 2006). Incorporation of 8 0 ,ater into the calcite shell of an organism (8 Ocaidte) is... 

Because warm surface seawater is usually supersaturated with respect to calcium carbonate, abiogenic precipitation of calcite and aragonite does occur, at least when supersaturations are very high. These conditions are limited to shallow water where temperatures can get sufficiently high, namely coastal tropical seas. 

Another potential mechanism responsible for the formation of laterally continuous, strata-bound calcite-cemented sandstones is the episodic up>-welling of anoxic seawater (see Kempe, 1990 Grot-zinger Knoll, 1995). The upwelling of such high alkalinity waters to shelf and coastal areas may occur subsequent to periods of sea water stratification accompanying sea-level rise. 

Sanford, W. E., and Konikow, L. F 1989. Simulation of calcite dissolution and porosity changes in seawater mixing zones in coastal aquifers. Water Resources Res., v. 25, pp. 665-667. 

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