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In this paper, we consider how long-term tectonic conditions and their effect on the surface environment of the earth interacted with the global carbonate cycle during the hothouse (greenhouse)–icehouse transition of the past 100 million years. Using the recalculated output of the Berner, Lasaga, and Garrels (BLAG) geochemical model as a template (Berner et al., 1983; Lasaga et al., 1985), we computed changes in seawater carbonate chemistry for the past 100 m.y. Experimental dolomite and calcite precipitation rate data as a function of environmental conditions were used to calculate the ratio of rates of dolomite and...

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