Ocean/Atmosphere History and Carbonate Precipitation Rates: A Solution to the “Dolomite Problem”?
Published:January 01, 2000
Rolf S. Arvidson, Fred T. Mackenzie, Michael Guidry, 2000. "Ocean/Atmosphere History and Carbonate Precipitation Rates: A Solution to the “Dolomite Problem”?", Marine Authigenesis: From Global to Microbial, Craig R. Glenn, Liliane Prévôt-Lucas, Jacques Lucas
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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 calcite precipitation rates during this period of time. We conclude from these model calculations that the observed decrease in the ratio of dolomite to calcite in sedimentary carbonates deposited since the Late Cretaceous transgression was a result of changes in the ocean saturation state with respect to carbonate minerals and global surface temperature. Thus, the solution to the classical “dolomite problem” may lie in relatively small but coupled changes in the composition and temperature of the atmosphere and seawater.
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Marine Authigenesis: From Global to Microbial
This volume is a collection of 33 state-of-the-art papers focusing on various aspects of authigenic and diagenetic marine minerals and related global elemental cycling. The commingling of the various studies of authigenic minerals in this volume, including the most recent advances in knowledge concerning the occurrence and origins of phosphorites, glauconites, dolomites, siderites, manganese-iron associations, barites, ironstones, and other marine chemical sediments/sedimentary rocks of early authigenic/diagenetic origin, is partly the result of the increasing awareness that there are many overlaps, even direct co-associations, between different authigenic minerals, both in time, space, and genesis. Taken together, this compilation represents a holistic approach towards marine authigenesis that considers the integrated whole more than the simple sum of its parts.