Skip to Main Content
Skip Nav Destination

Global land-sea carbonate flux for the past 60 m.y. averages 10.3-12.5 × 1014 g/y, surprisingly close to 12.2 × 1014 g/y calculated using data from today's rivers. However, oceanic carbonate accumulation rates vary between 7.8 × 1014 g/y and 28.6 × 1014 g/y, a factor of four. Furthermore carbonate accumulation oscillates between periods of high (0-6, 22-30, 45-53 m.y.) and low deposition. Prior to 30 m.y.BP all oceans behaved in concert, but since then significant partitioning between the Pacific and Atlantic-Indian oceans has complicated the picture. Prior to 15 m.y.BP the Pacific consumed two-thirds of the total pelagic carbonate, but since that time has never consumed more than 50 percent of the total, and for the past 3 m.y. only 38 percent. This trend is related to hypsometry and changes in carbonate dissolution rates as well as to changes in relative size of the oceans resulting from seafloor spreading.

Global carbonate flux through time appears to be simply related to changing land-sea ratios as calculated from sea level curves. In this system, maximum exposed continental area correlates with high pelagic carbonate flux. Deviations from this simple relationship are attributable to changes in carbonate production-dissolution ratios, latitudinal hypsometric differences, global climatic changes, and biases introduced by the simple averaging techniques used in the calculations.

You do not currently have access to this chapter.

Figures & Tables





Citing Books via

Close Modal

or Create an Account

Close Modal
Close Modal